mknod 能创建的device代码

mknod在Linux下可以创建各种设备,这个文档说明了哪个代码能创建什么东西。

http://www.lanana.org/docs/device-list/devices-2.6+.txt

            LINUX ALLOCATED DEVICES (2.6+ version)

         Maintained by Torben Mathiasen 

              Last revised: 25 January 2005

This list is the Linux Device List, the official registry of allocated
device numbers and /dev directory nodes for the Linux operating
system.

The latest version of this list is available from
http://www.lanana.org/docs/device-list/ or
ftp://ftp.kernel.org/pub/linux/docs/device-list/.  This version may be
newer than the one distributed with the Linux kernel.

The LaTeX version of this document is no longer maintained.

This document is included by reference into the Filesystem Hierarchy
Standard (FHS).  The FHS is available from http://www.pathname.com/fhs/.

Allocations marked (68k/Amiga) apply to Linux/68k on the Amiga
platform only.  Allocations marked (68k/Atari) apply to Linux/68k on
the Atari platform only.

The symbol {2.6} means the allocation is obsolete and scheduled for
removal once kernel version 2.6 (or equivalent) is released. Some of these
allocations have already been removed.

This document is in the public domain.  The author requests, however,
that semantically altered versions are not distributed without
permission of the author, assuming the author can be contacted without
an unreasonable effort.

In particular, please don't sent patches for this list to Linus, at
least not without contacting me first.

I do not have any information about these devices beyond what appears
on this list.  Any such information requests will be deleted without
reply.


      **** DEVICE DRIVERS AUTHORS PLEASE READ THIS ****

To have a major number allocated, or a minor number in situations
where that applies (e.g. busmice), please contact me with the
appropriate device information.  Also, if you have additional
information regarding any of the devices listed below, or if I have
made a mistake, I would greatly appreciate a note.

I do, however, make a few requests about the nature of your report.
This is necessary for me to be able to keep this list up to date and
correct in a timely manner.  First of all, *please* send it to the
correct address... .  I receive hundreds of email
messages a day, so mail sent to other addresses may very well get lost
in the avalanche.  Please put in a descriptive subject, so I can find
your mail again should I need to.  Too many people send me email
saying just "device number request" in the subject.

Second, please include a description of the device *in the same format
as this list*.  The reason for this is that it is the only way I have
found to ensure I have all the requisite information to publish your
device and avoid conflicts.

Third, please don't assume that the distributed version of the list is
up to date.  Due to the number of registrations I have to maintain it
in "batch mode", so there is likely additional registrations that
haven't been listed yet.

Finally, sometimes I have to play "namespace police."  Please don't be
offended.  I often get submissions for /dev names that would be bound
to cause conflicts down the road.  I am trying to avoid getting in a
situation where we would have to suffer an incompatible forward
change.  Therefore, please consult with me *before* you make your
device names and numbers in any way public, at least to the point
where it would be at all difficult to get them changed.

Your cooperation is appreciated.


  0     Unnamed devices (e.g. non-device mounts)
          0 = reserved as null device number
        See block major 144, 145, 146 for expansion areas.

  1 char    Memory devices
          1 = /dev/mem      Physical memory access
          2 = /dev/kmem     Kernel virtual memory access
          3 = /dev/null     Null device
          4 = /dev/port     I/O port access
          5 = /dev/zero     Null byte source
          6 = /dev/core     OBSOLETE - replaced by /proc/kcore
          7 = /dev/full     Returns ENOSPC on write
          8 = /dev/random   Nondeterministic random number gen.
          9 = /dev/urandom  Faster, less secure random number gen.
         10 = /dev/aio      Asyncronous I/O notification interface
         11 = /dev/kmsg     Writes to this come out as printk's
  1 block   RAM disk
          0 = /dev/ram0     First RAM disk
          1 = /dev/ram1     Second RAM disk
            ...
        250 = /dev/initrd   Initial RAM disk {2.6}

        Older kernels had /dev/ramdisk (1, 1) here.
        /dev/initrd refers to a RAM disk which was preloaded
        by the boot loader; newer kernels use /dev/ram0 for
        the initrd.

  2 char    Pseudo-TTY masters
          0 = /dev/ptyp0    First PTY master
          1 = /dev/ptyp1    Second PTY master
            ...
        255 = /dev/ptyef    256th PTY master

        Pseudo-tty's are named as follows:
        * Masters are "pty", slaves are "tty";
        * the fourth letter is one of pqrstuvwxyzabcde indicating
          the 1st through 16th series of 16 pseudo-ttys each, and
        * the fifth letter is one of 0123456789abcdef indicating
          the position within the series.

        These are the old-style (BSD) PTY devices; Unix98
        devices are on major 128 and above and use the PTY
        master multiplex (/dev/ptmx) to acquire a PTY on
        demand.
  
  2 block   Floppy disks
          0 = /dev/fd0      Controller 0, drive 0, autodetect
          1 = /dev/fd1      Controller 0, drive 1, autodetect
          2 = /dev/fd2      Controller 0, drive 2, autodetect
          3 = /dev/fd3      Controller 0, drive 3, autodetect
        128 = /dev/fd4      Controller 1, drive 0, autodetect
        129 = /dev/fd5      Controller 1, drive 1, autodetect
        130 = /dev/fd6      Controller 1, drive 2, autodetect
        131 = /dev/fd7      Controller 1, drive 3, autodetect

        To specify format, add to the autodetect device number:
          0 = /dev/fd?      Autodetect format
          4 = /dev/fd?d360  5.25"  360K in a 360K  drive(1)
         20 = /dev/fd?h360  5.25"  360K in a 1200K drive(1)
         48 = /dev/fd?h410  5.25"  410K in a 1200K drive
         64 = /dev/fd?h420  5.25"  420K in a 1200K drive
         24 = /dev/fd?h720  5.25"  720K in a 1200K drive
         80 = /dev/fd?h880  5.25"  880K in a 1200K drive(1)
          8 = /dev/fd?h1200 5.25" 1200K in a 1200K drive(1)
         40 = /dev/fd?h1440 5.25" 1440K in a 1200K drive(1)
         56 = /dev/fd?h1476 5.25" 1476K in a 1200K drive
         72 = /dev/fd?h1494 5.25" 1494K in a 1200K drive
         92 = /dev/fd?h1600 5.25" 1600K in a 1200K drive(1)

         12 = /dev/fd?u360  3.5"   360K Double Density(2)
         16 = /dev/fd?u720  3.5"   720K Double Density(1)
        120 = /dev/fd?u800  3.5"   800K Double Density(2)
         52 = /dev/fd?u820  3.5"   820K Double Density
         68 = /dev/fd?u830  3.5"   830K Double Density
         84 = /dev/fd?u1040 3.5"  1040K Double Density(1)
         88 = /dev/fd?u1120 3.5"  1120K Double Density(1)
         28 = /dev/fd?u1440 3.5"  1440K High Density(1)
        124 = /dev/fd?u1600 3.5"  1600K High Density(1)
         44 = /dev/fd?u1680 3.5"  1680K High Density(3)
         60 = /dev/fd?u1722 3.5"  1722K High Density
         76 = /dev/fd?u1743 3.5"  1743K High Density
         96 = /dev/fd?u1760 3.5"  1760K High Density
        116 = /dev/fd?u1840 3.5"  1840K High Density(3)
        100 = /dev/fd?u1920 3.5"  1920K High Density(1)
         32 = /dev/fd?u2880 3.5"  2880K Extra Density(1)
        104 = /dev/fd?u3200 3.5"  3200K Extra Density
        108 = /dev/fd?u3520 3.5"  3520K Extra Density
        112 = /dev/fd?u3840 3.5"  3840K Extra Density(1)

         36 = /dev/fd?CompaQ    Compaq 2880K drive; obsolete?

        (1) Autodetectable format
        (2) Autodetectable format in a Double Density (720K) drive only
        (3) Autodetectable format in a High Density (1440K) drive only

        NOTE: The letter in the device name (d, q, h or u)
        signifies the type of drive: 5.25" Double Density (d),
        5.25" Quad Density (q), 5.25" High Density (h) or 3.5"
        (any model, u).  The use of the capital letters D, H
        and E for the 3.5" models have been deprecated, since
        the drive type is insignificant for these devices.

  3 char    Pseudo-TTY slaves
          0 = /dev/ttyp0    First PTY slave
          1 = /dev/ttyp1    Second PTY slave
            ...
        255 = /dev/ttyef    256th PTY slave

        These are the old-style (BSD) PTY devices; Unix98
        devices are on major 136 and above.

  3 block   First MFM, RLL and IDE hard disk/CD-ROM interface
          0 = /dev/hda      Master: whole disk (or CD-ROM)
         64 = /dev/hdb      Slave: whole disk (or CD-ROM)

        For partitions, add to the whole disk device number:
          0 = /dev/hd?      Whole disk
          1 = /dev/hd?1     First partition
          2 = /dev/hd?2     Second partition
            ...
         63 = /dev/hd?63    63rd partition

        For Linux/i386, partitions 1-4 are the primary
        partitions, and 5 and above are logical partitions.
        Other versions of Linux use partitioning schemes
        appropriate to their respective architectures.

  4 char    TTY devices
          0 = /dev/tty0     Current virtual console

          1 = /dev/tty1     First virtual console
            ...
         63 = /dev/tty63    63rd virtual console
         64 = /dev/ttyS0    First UART serial port
            ...
        255 = /dev/ttyS191  192nd UART serial port

        UART serial ports refer to 8250/16450/16550 series devices.

        Older versions of the Linux kernel used this major
        number for BSD PTY devices.  As of Linux 2.1.115, this
        is no longer supported.  Use major numbers 2 and 3.

  4 block   Aliases for dynamically allocated major devices to be used
        when its not possible to create the real device nodes
        because the root filesystem is mounted read-only.

                  0 = /dev/root

  5 char    Alternate TTY devices
          0 = /dev/tty      Current TTY device
          1 = /dev/console  System console
          2 = /dev/ptmx     PTY master multiplex
         64 = /dev/cua0     Callout device for ttyS0
            ...
        255 = /dev/cua191   Callout device for ttyS191

        (5,1) is /dev/console starting with Linux 2.1.71.  See
        the section on terminal devices for more information
        on /dev/console.

  6 char    Parallel printer devices
          0 = /dev/lp0      Parallel printer on parport0
          1 = /dev/lp1      Parallel printer on parport1
            ...

        Current Linux kernels no longer have a fixed mapping
        between parallel ports and I/O addresses.  Instead,
        they are redirected through the parport multiplex layer.

  7 char    Virtual console capture devices
          0 = /dev/vcs      Current vc text contents
          1 = /dev/vcs1     tty1 text contents
            ...
         63 = /dev/vcs63    tty63 text contents
        128 = /dev/vcsa     Current vc text/attribute contents
        129 = /dev/vcsa1    tty1 text/attribute contents
            ...
        191 = /dev/vcsa63   tty63 text/attribute contents
    
        NOTE: These devices permit both read and write access.

  7 block   Loopback devices
          0 = /dev/loop0    First loopback device
          1 = /dev/loop1    Second loopback device
            ...

        The loopback devices are used to mount filesystems not
        associated with block devices.  The binding to the
        loopback devices is handled by mount(8) or losetup(8).

  8 block   SCSI disk devices (0-15)
          0 = /dev/sda      First SCSI disk whole disk
         16 = /dev/sdb      Second SCSI disk whole disk
         32 = /dev/sdc      Third SCSI disk whole disk
            ...
        240 = /dev/sdp      Sixteenth SCSI disk whole disk

        Partitions are handled in the same way as for IDE
        disks (see major number 3) except that the limit on
        partitions is 15.

  9 char    SCSI tape devices
          0 = /dev/st0      First SCSI tape, mode 0
          1 = /dev/st1      Second SCSI tape, mode 0
            ...
         32 = /dev/st0l     First SCSI tape, mode 1
         33 = /dev/st1l     Second SCSI tape, mode 1
            ...
         64 = /dev/st0m     First SCSI tape, mode 2
         65 = /dev/st1m     Second SCSI tape, mode 2
            ...
         96 = /dev/st0a     First SCSI tape, mode 3
         97 = /dev/st1a     Second SCSI tape, mode 3
              ...
        128 = /dev/nst0     First SCSI tape, mode 0, no rewind
        129 = /dev/nst1     Second SCSI tape, mode 0, no rewind
            ...
        160 = /dev/nst0l    First SCSI tape, mode 1, no rewind
        161 = /dev/nst1l    Second SCSI tape, mode 1, no rewind
            ...
        192 = /dev/nst0m    First SCSI tape, mode 2, no rewind
        193 = /dev/nst1m    Second SCSI tape, mode 2, no rewind
            ...
        224 = /dev/nst0a    First SCSI tape, mode 3, no rewind
        225 = /dev/nst1a    Second SCSI tape, mode 3, no rewind
            ...

        "No rewind" refers to the omission of the default
        automatic rewind on device close.  The MTREW or MTOFFL
        ioctl()'s can be used to rewind the tape regardless of
        the device used to access it.

  9 block   Metadisk (RAID) devices
          0 = /dev/md0      First metadisk group
          1 = /dev/md1      Second metadisk group
            ...

        The metadisk driver is used to span a
        filesystem across multiple physical disks.

 10 char    Non-serial mice, misc features
          0 = /dev/logibm   Logitech bus mouse
          1 = /dev/psaux    PS/2-style mouse port
          2 = /dev/inportbm Microsoft Inport bus mouse
          3 = /dev/atibm    ATI XL bus mouse
          4 = /dev/jbm      J-mouse
          4 = /dev/amigamouse   Amiga mouse (68k/Amiga)
          5 = /dev/atarimouse   Atari mouse
          6 = /dev/sunmouse Sun mouse
          7 = /dev/amigamouse1  Second Amiga mouse
          8 = /dev/smouse   Simple serial mouse driver
          9 = /dev/pc110pad IBM PC-110 digitizer pad
         10 = /dev/adbmouse Apple Desktop Bus mouse
         11 = /dev/vrtpanel Vr41xx embedded touch panel
         13 = /dev/vpcmouse Connectix Virtual PC Mouse
         14 = /dev/touchscreen/ucb1x00  UCB 1x00 touchscreen
         15 = /dev/touchscreen/mk712    MK712 touchscreen
        128 = /dev/beep     Fancy beep device
        129 = /dev/modreq   Kernel module load request {2.6}
        130 = /dev/watchdog Watchdog timer port
        131 = /dev/temperature  Machine internal temperature
        132 = /dev/hwtrap   Hardware fault trap
        133 = /dev/exttrp   External device trap
        134 = /dev/apm_bios Advanced Power Management BIOS
        135 = /dev/rtc      Real Time Clock
        139 = /dev/openprom SPARC OpenBoot PROM
        140 = /dev/relay8   Berkshire Products Octal relay card
        141 = /dev/relay16  Berkshire Products ISO-16 relay card
        142 = /dev/msr      x86 model-specific registers {2.6}
        143 = /dev/pciconf  PCI configuration space
        144 = /dev/nvram    Non-volatile configuration RAM
        145 = /dev/hfmodem  Soundcard shortwave modem control {2.6}
        146 = /dev/graphics Linux/SGI graphics device
        147 = /dev/opengl   Linux/SGI OpenGL pipe
        148 = /dev/gfx      Linux/SGI graphics effects device
        149 = /dev/input/mouse  Linux/SGI Irix emulation mouse
        150 = /dev/input/keyboard Linux/SGI Irix emulation keyboard
        151 = /dev/led      Front panel LEDs
        152 = /dev/kpoll    Kernel Poll Driver
        153 = /dev/mergemem Memory merge device
        154 = /dev/pmu      Macintosh PowerBook power manager
        155 = /dev/isictl   MultiTech ISICom serial control
        156 = /dev/lcd      Front panel LCD display
        157 = /dev/ac       Applicom Intl Profibus card
        158 = /dev/nwbutton Netwinder external button
        159 = /dev/nwdebug  Netwinder debug interface
        160 = /dev/nwflash  Netwinder flash memory
        161 = /dev/userdma  User-space DMA access
        162 = /dev/smbus    System Management Bus
        163 = /dev/lik      Logitech Internet Keyboard
        164 = /dev/ipmo     Intel Intelligent Platform Management
        165 = /dev/vmmon    VMWare virtual machine monitor
        166 = /dev/i2o/ctl  I2O configuration manager
        167 = /dev/specialix_sxctl Specialix serial control
        168 = /dev/tcldrv   Technology Concepts serial control
        169 = /dev/specialix_rioctl Specialix RIO serial control
        170 = /dev/thinkpad/thinkpad    IBM Thinkpad devices
        171 = /dev/srripc   QNX4 API IPC manager
        172 = /dev/usemaclone   Semaphore clone device
        173 = /dev/ipmikcs  Intelligent Platform Management
        174 = /dev/uctrl    SPARCbook 3 microcontroller
        175 = /dev/agpgart  AGP Graphics Address Remapping Table
        176 = /dev/gtrsc    Gorgy Timing radio clock
        177 = /dev/cbm      Serial CBM bus
        178 = /dev/jsflash  JavaStation OS flash SIMM
        179 = /dev/xsvc     High-speed shared-mem/semaphore service
        180 = /dev/vrbuttons    Vr41xx button input device
        181 = /dev/toshiba  Toshiba laptop SMM support
        182 = /dev/perfctr  Performance-monitoring counters
        183 = /dev/hwrng    Generic random number generator
        184 = /dev/cpu/microcode CPU microcode update interface
        186 = /dev/atomicps Atomic shapshot of process state data
        187 = /dev/irnet    IrNET device
        188 = /dev/smbusbios    SMBus BIOS
        189 = /dev/ussp_ctl User space serial port control
        190 = /dev/crash    Mission Critical Linux crash dump facility
        191 = /dev/pcl181   
        192 = /dev/nas_xbus NAS xbus LCD/buttons access
        193 = /dev/d7s      SPARC 7-segment display
        194 = /dev/zkshim   Zero-Knowledge network shim control
        195 = /dev/elographics/e2201    Elographics touchscreen E271-2201
        198 = /dev/sexec    Signed executable interface
        199 = /dev/scanners/cuecat :CueCat barcode scanner
        200 = /dev/net/tun  TAP/TUN network device
        201 = /dev/button/gulpb Transmeta GULP-B buttons
        202 = /dev/emd/ctl  Enhanced Metadisk RAID (EMD) control
        204 = /dev/video/em8300     EM8300 DVD decoder control
        205 = /dev/video/em8300_mv  EM8300 DVD decoder video
        206 = /dev/video/em8300_ma  EM8300 DVD decoder audio
        207 = /dev/video/em8300_sp  EM8300 DVD decoder subpicture
        208 = /dev/compaq/cpqphpc   Compaq PCI Hot Plug Controller
        209 = /dev/compaq/cpqrid    Compaq Remote Insight Driver
        210 = /dev/impi/bt  IMPI coprocessor block transfer 
        211 = /dev/impi/smic    IMPI coprocessor stream interface
        212 = /dev/watchdogs/0  First watchdog device
        213 = /dev/watchdogs/1  Second watchdog device
        214 = /dev/watchdogs/2  Third watchdog device
        215 = /dev/watchdogs/3  Fourth watchdog device
        216 = /dev/fujitsu/apanel   Fujitsu/Siemens application panel
        217 = /dev/ni/natmotn       National Instruments Motion
        218 = /dev/kchuid   Inter-process chuid control
        219 = /dev/modems/mwave MWave modem firmware upload
        220 = /dev/mptctl   Message passing technology (MPT) control
        221 = /dev/mvista/hssdsi    Montavista PICMG hot swap system driver
        222 = /dev/mvista/hasi      Montavista PICMG high availability
        223 = /dev/input/uinput     User level driver support for input
        224 = /dev/tpm      TCPA TPM driver
        225 = /dev/pps      Pulse Per Second driver
        226 = /dev/systrace Systrace device
        227 = /dev/mcelog   X86_64 Machine Check Exception driver
        228 = /dev/hpet     HPET driver
        229 = /dev/fuse     Fuse (virtual filesystem in user-space)
        230 = /dev/midishare    MidiShare driver
        240-254         Reserved for local use
        255         Reserved for MISC_DYNAMIC_MINOR

 11 char    Raw keyboard device (Linux/SPARC only)
          0 = /dev/kbd      Raw keyboard device

 11 char    Serial Mux device   (Linux/PA-RISC only)
          0 = /dev/ttyB0    First mux port
          1 = /dev/ttyB1    Second mux port
            ...

 11 block   SCSI CD-ROM devices
          0 = /dev/scd0     First SCSI CD-ROM
          1 = /dev/scd1     Second SCSI CD-ROM
            ...

        The prefix /dev/sr (instead of /dev/scd) has been deprecated.

 12 char    QIC-02 tape
          2 = /dev/ntpqic11 QIC-11, no rewind-on-close
          3 = /dev/tpqic11  QIC-11, rewind-on-close
          4 = /dev/ntpqic24 QIC-24, no rewind-on-close
          5 = /dev/tpqic24  QIC-24, rewind-on-close
          6 = /dev/ntpqic120    QIC-120, no rewind-on-close
          7 = /dev/tpqic120 QIC-120, rewind-on-close
          8 = /dev/ntpqic150    QIC-150, no rewind-on-close
          9 = /dev/tpqic150 QIC-150, rewind-on-close

        The device names specified are proposed -- if there
        are "standard" names for these devices, please let me know.

 12 block   MSCDEX CD-ROM callback support {2.6}
          0 = /dev/dos_cd0  First MSCDEX CD-ROM
          1 = /dev/dos_cd1  Second MSCDEX CD-ROM
            ...

 13 char    Input core
          0 = /dev/input/js0    First joystick
          1 = /dev/input/js1    Second joystick
            ...
         32 = /dev/input/mouse0 First mouse
         33 = /dev/input/mouse1 Second mouse
            ...
         63 = /dev/input/mice   Unified mouse
         64 = /dev/input/event0 First event queue
         65 = /dev/input/event1 Second event queue
            ...

        Each device type has 5 bits (32 minors).

 13 block   8-bit MFM/RLL/IDE controller
          0 = /dev/xda      First XT disk whole disk
         64 = /dev/xdb      Second XT disk whole disk

        Partitions are handled in the same way as IDE disks
        (see major number 3).

 14 char    Open Sound System (OSS)
          0 = /dev/mixer    Mixer control
          1 = /dev/sequencer    Audio sequencer
          2 = /dev/midi00   First MIDI port
          3 = /dev/dsp      Digital audio
          4 = /dev/audio    Sun-compatible digital audio
          6 = /dev/sndstat  Sound card status information {2.6}
          7 = /dev/audioctl SPARC audio control device
          8 = /dev/sequencer2   Sequencer -- alternate device
         16 = /dev/mixer1   Second soundcard mixer control
         17 = /dev/patmgr0  Sequencer patch manager
         18 = /dev/midi01   Second MIDI port
         19 = /dev/dsp1     Second soundcard digital audio
         20 = /dev/audio1   Second soundcard Sun digital audio
         33 = /dev/patmgr1  Sequencer patch manager
         34 = /dev/midi02   Third MIDI port
         50 = /dev/midi03   Fourth MIDI port
 14 block   BIOS harddrive callback support {2.6}
          0 = /dev/dos_hda  First BIOS harddrive whole disk
         64 = /dev/dos_hdb  Second BIOS harddrive whole disk
        128 = /dev/dos_hdc  Third BIOS harddrive whole disk
        192 = /dev/dos_hdd  Fourth BIOS harddrive whole disk

        Partitions are handled in the same way as IDE disks
        (see major number 3).

 15 char    Joystick
          0 = /dev/js0      First analog joystick
          1 = /dev/js1      Second analog joystick
            ...
        128 = /dev/djs0     First digital joystick
        129 = /dev/djs1     Second digital joystick
            ...
 15 block   Sony CDU-31A/CDU-33A CD-ROM
          0 = /dev/sonycd   Sony CDU-31a CD-ROM

 16 char    Non-SCSI scanners
          0 = /dev/gs4500   Genius 4500 handheld scanner
 16 block   GoldStar CD-ROM
          0 = /dev/gscd     GoldStar CD-ROM

 17 char    Chase serial card
          0 = /dev/ttyH0    First Chase port
          1 = /dev/ttyH1    Second Chase port
            ...
 17 block   Optics Storage CD-ROM
          0 = /dev/optcd    Optics Storage CD-ROM

 18 char    Chase serial card - alternate devices
          0 = /dev/cuh0     Callout device for ttyH0
          1 = /dev/cuh1     Callout device for ttyH1
            ...
 18 block   Sanyo CD-ROM
          0 = /dev/sjcd     Sanyo CD-ROM

 19 char    Cyclades serial card
          0 = /dev/ttyC0    First Cyclades port
            ...
         31 = /dev/ttyC31   32nd Cyclades port
 19 block   "Double" compressed disk
          0 = /dev/double0  First compressed disk
            ...
          7 = /dev/double7  Eighth compressed disk
        128 = /dev/cdouble0 Mirror of first compressed disk
            ...
        135 = /dev/cdouble7 Mirror of eighth compressed disk

        See the Double documentation for the meaning of the
        mirror devices.

 20 char    Cyclades serial card - alternate devices
          0 = /dev/cub0     Callout device for ttyC0
            ...
         31 = /dev/cub31    Callout device for ttyC31
 20 block   Hitachi CD-ROM (under development)
          0 = /dev/hitcd    Hitachi CD-ROM

 21 char    Generic SCSI access
          0 = /dev/sg0      First generic SCSI device
          1 = /dev/sg1      Second generic SCSI device
            ...

        Most distributions name these /dev/sga, /dev/sgb...;
        this sets an unnecessary limit of 26 SCSI devices in
        the system and is counter to standard Linux
        device-naming practice.

 21 block   Acorn MFM hard drive interface
          0 = /dev/mfma     First MFM drive whole disk
         64 = /dev/mfmb     Second MFM drive whole disk

        This device is used on the ARM-based Acorn RiscPC.
        Partitions are handled the same way as for IDE disks
        (see major number 3). 

 22 char    Digiboard serial card
          0 = /dev/ttyD0    First Digiboard port
          1 = /dev/ttyD1    Second Digiboard port
            ...
 22 block   Second IDE hard disk/CD-ROM interface
          0 = /dev/hdc      Master: whole disk (or CD-ROM)
         64 = /dev/hdd      Slave: whole disk (or CD-ROM)
        
        Partitions are handled the same way as for the first
        interface (see major number 3).

 23 char    Digiboard serial card - alternate devices
          0 = /dev/cud0     Callout device for ttyD0
          1 = /dev/cud1     Callout device for ttyD1
              ...
 23 block   Mitsumi proprietary CD-ROM
          0 = /dev/mcd      Mitsumi CD-ROM

 24 char    Stallion serial card
          0 = /dev/ttyE0    Stallion port 0 card 0
          1 = /dev/ttyE1    Stallion port 1 card 0
            ...
         64 = /dev/ttyE64   Stallion port 0 card 1
         65 = /dev/ttyE65   Stallion port 1 card 1
              ...
        128 = /dev/ttyE128  Stallion port 0 card 2
        129 = /dev/ttyE129  Stallion port 1 card 2
            ...
        192 = /dev/ttyE192  Stallion port 0 card 3
        193 = /dev/ttyE193  Stallion port 1 card 3
            ...
 24 block   Sony CDU-535 CD-ROM
          0 = /dev/cdu535   Sony CDU-535 CD-ROM

 25 char    Stallion serial card - alternate devices
          0 = /dev/cue0     Callout device for ttyE0
          1 = /dev/cue1     Callout device for ttyE1
            ...
         64 = /dev/cue64    Callout device for ttyE64
         65 = /dev/cue65    Callout device for ttyE65
            ...
        128 = /dev/cue128   Callout device for ttyE128
        129 = /dev/cue129   Callout device for ttyE129
            ...
        192 = /dev/cue192   Callout device for ttyE192
        193 = /dev/cue193   Callout device for ttyE193
              ...
 25 block   First Matsushita (Panasonic/SoundBlaster) CD-ROM
          0 = /dev/sbpcd0   Panasonic CD-ROM controller 0 unit 0
          1 = /dev/sbpcd1   Panasonic CD-ROM controller 0 unit 1
          2 = /dev/sbpcd2   Panasonic CD-ROM controller 0 unit 2
          3 = /dev/sbpcd3   Panasonic CD-ROM controller 0 unit 3

 26 char    Quanta WinVision frame grabber {2.6}
          0 = /dev/wvisfgrab    Quanta WinVision frame grabber
 26 block   Second Matsushita (Panasonic/SoundBlaster) CD-ROM
          0 = /dev/sbpcd4   Panasonic CD-ROM controller 1 unit 0
          1 = /dev/sbpcd5   Panasonic CD-ROM controller 1 unit 1
          2 = /dev/sbpcd6   Panasonic CD-ROM controller 1 unit 2
          3 = /dev/sbpcd7   Panasonic CD-ROM controller 1 unit 3

 27 char    QIC-117 tape
          0 = /dev/qft0     Unit 0, rewind-on-close
          1 = /dev/qft1     Unit 1, rewind-on-close
          2 = /dev/qft2     Unit 2, rewind-on-close
          3 = /dev/qft3     Unit 3, rewind-on-close
          4 = /dev/nqft0    Unit 0, no rewind-on-close
          5 = /dev/nqft1    Unit 1, no rewind-on-close
          6 = /dev/nqft2    Unit 2, no rewind-on-close
          7 = /dev/nqft3    Unit 3, no rewind-on-close
         16 = /dev/zqft0    Unit 0, rewind-on-close, compression
         17 = /dev/zqft1    Unit 1, rewind-on-close, compression
         18 = /dev/zqft2    Unit 2, rewind-on-close, compression
         19 = /dev/zqft3    Unit 3, rewind-on-close, compression
         20 = /dev/nzqft0   Unit 0, no rewind-on-close, compression
         21 = /dev/nzqft1   Unit 1, no rewind-on-close, compression
         22 = /dev/nzqft2   Unit 2, no rewind-on-close, compression
         23 = /dev/nzqft3   Unit 3, no rewind-on-close, compression
         32 = /dev/rawqft0  Unit 0, rewind-on-close, no file marks
         33 = /dev/rawqft1  Unit 1, rewind-on-close, no file marks
         34 = /dev/rawqft2  Unit 2, rewind-on-close, no file marks
         35 = /dev/rawqft3  Unit 3, rewind-on-close, no file marks
         36 = /dev/nrawqft0 Unit 0, no rewind-on-close, no file marks
         37 = /dev/nrawqft1 Unit 1, no rewind-on-close, no file marks
         38 = /dev/nrawqft2 Unit 2, no rewind-on-close, no file marks
         39 = /dev/nrawqft3 Unit 3, no rewind-on-close, no file marks
 27 block   Third Matsushita (Panasonic/SoundBlaster) CD-ROM
          0 = /dev/sbpcd8   Panasonic CD-ROM controller 2 unit 0
          1 = /dev/sbpcd9   Panasonic CD-ROM controller 2 unit 1
          2 = /dev/sbpcd10  Panasonic CD-ROM controller 2 unit 2
          3 = /dev/sbpcd11  Panasonic CD-ROM controller 2 unit 3

 28 char    Stallion serial card - card programming
          0 = /dev/staliomem0   First Stallion card I/O memory
          1 = /dev/staliomem1   Second Stallion card I/O memory
          2 = /dev/staliomem2   Third Stallion card I/O memory
          3 = /dev/staliomem3   Fourth Stallion card I/O memory
 28 char    Atari SLM ACSI laser printer (68k/Atari)
          0 = /dev/slm0     First SLM laser printer
          1 = /dev/slm1     Second SLM laser printer
            ...
 28 block   Fourth Matsushita (Panasonic/SoundBlaster) CD-ROM
          0 = /dev/sbpcd12  Panasonic CD-ROM controller 3 unit 0
          1 = /dev/sbpcd13  Panasonic CD-ROM controller 3 unit 1
          2 = /dev/sbpcd14  Panasonic CD-ROM controller 3 unit 2
          3 = /dev/sbpcd15  Panasonic CD-ROM controller 3 unit 3
 28 block   ACSI disk (68k/Atari)
          0 = /dev/ada      First ACSI disk whole disk
         16 = /dev/adb      Second ACSI disk whole disk
         32 = /dev/adc      Third ACSI disk whole disk
            ...
        240 = /dev/adp      16th ACSI disk whole disk

        Partitions are handled in the same way as for IDE
        disks (see major number 3) except that the limit on
        partitions is 15, like SCSI.

 29 char    Universal frame buffer
          0 = /dev/fb0      First frame buffer
          1 = /dev/fb1      Second frame buffer
            ...
         31 = /dev/fb31     32nd frame buffer

 29 block   Aztech/Orchid/Okano/Wearnes CD-ROM
          0 = /dev/aztcd    Aztech CD-ROM

 30 char    iBCS-2 compatibility devices
          0 = /dev/socksys  Socket access
          1 = /dev/spx      SVR3 local X interface
         32 = /dev/inet/ip  Network access
         33 = /dev/inet/icmp
         34 = /dev/inet/ggp
         35 = /dev/inet/ipip
         36 = /dev/inet/tcp
         37 = /dev/inet/egp
         38 = /dev/inet/pup
         39 = /dev/inet/udp
         40 = /dev/inet/idp
         41 = /dev/inet/rawip

        Additionally, iBCS-2 requires the following links:

        /dev/ip -> /dev/inet/ip
        /dev/icmp -> /dev/inet/icmp
        /dev/ggp -> /dev/inet/ggp
        /dev/ipip -> /dev/inet/ipip
        /dev/tcp -> /dev/inet/tcp
        /dev/egp -> /dev/inet/egp
        /dev/pup -> /dev/inet/pup
        /dev/udp -> /dev/inet/udp
        /dev/idp -> /dev/inet/idp
        /dev/rawip -> /dev/inet/rawip
        /dev/inet/arp -> /dev/inet/udp
        /dev/inet/rip -> /dev/inet/udp
        /dev/nfsd -> /dev/socksys
        /dev/X0R -> /dev/null (? apparently not required ?)

 30 block   Philips LMS CM-205 CD-ROM
          0 = /dev/cm205cd  Philips LMS CM-205 CD-ROM

        /dev/lmscd is an older name for this device.  This
        driver does not work with the CM-205MS CD-ROM.

 31 char    MPU-401 MIDI
          0 = /dev/mpu401data   MPU-401 data port
          1 = /dev/mpu401stat   MPU-401 status port
 31 block   ROM/flash memory card
          0 = /dev/rom0     First ROM card (rw)
              ...
          7 = /dev/rom7     Eighth ROM card (rw)
          8 = /dev/rrom0    First ROM card (ro)
            ...
         15 = /dev/rrom7    Eighth ROM card (ro)
         16 = /dev/flash0   First flash memory card (rw)
            ...
         23 = /dev/flash7   Eighth flash memory card (rw)
         24 = /dev/rflash0  First flash memory card (ro)
            ...
         31 = /dev/rflash7  Eighth flash memory card (ro)

        The read-write (rw) devices support back-caching
        written data in RAM, as well as writing to flash RAM
        devices.  The read-only devices (ro) support reading
        only.

 32 char    Specialix serial card
          0 = /dev/ttyX0    First Specialix port
          1 = /dev/ttyX1    Second Specialix port
            ...
 32 block   Philips LMS CM-206 CD-ROM
          0 = /dev/cm206cd  Philips LMS CM-206 CD-ROM

 33 char    Specialix serial card - alternate devices
          0 = /dev/cux0     Callout device for ttyX0
          1 = /dev/cux1     Callout device for ttyX1
            ...
 33 block   Third IDE hard disk/CD-ROM interface
          0 = /dev/hde      Master: whole disk (or CD-ROM)
         64 = /dev/hdf      Slave: whole disk (or CD-ROM)

        Partitions are handled the same way as for the first
        interface (see major number 3).

 34 char    Z8530 HDLC driver
          0 = /dev/scc0     First Z8530, first port
          1 = /dev/scc1     First Z8530, second port
          2 = /dev/scc2     Second Z8530, first port
          3 = /dev/scc3     Second Z8530, second port
            ...

        In a previous version these devices were named
        /dev/sc1 for /dev/scc0, /dev/sc2 for /dev/scc1, and so
        on.

 34 block   Fourth IDE hard disk/CD-ROM interface
          0 = /dev/hdg      Master: whole disk (or CD-ROM)
         64 = /dev/hdh      Slave: whole disk (or CD-ROM)
        
        Partitions are handled the same way as for the first
        interface (see major number 3).

 35 char    tclmidi MIDI driver
          0 = /dev/midi0    First MIDI port, kernel timed
          1 = /dev/midi1    Second MIDI port, kernel timed
          2 = /dev/midi2    Third MIDI port, kernel timed
          3 = /dev/midi3    Fourth MIDI port, kernel timed
         64 = /dev/rmidi0   First MIDI port, untimed
         65 = /dev/rmidi1   Second MIDI port, untimed
         66 = /dev/rmidi2   Third MIDI port, untimed
         67 = /dev/rmidi3   Fourth MIDI port, untimed
        128 = /dev/smpte0   First MIDI port, SMPTE timed
        129 = /dev/smpte1   Second MIDI port, SMPTE timed
        130 = /dev/smpte2   Third MIDI port, SMPTE timed
        131 = /dev/smpte3   Fourth MIDI port, SMPTE timed
 35 block   Slow memory ramdisk
          0 = /dev/slram    Slow memory ramdisk

 36 char    Netlink support
          0 = /dev/route    Routing, device updates, kernel to user
          1 = /dev/skip     enSKIP security cache control
          3 = /dev/fwmonitor    Firewall packet copies
         16 = /dev/tap0     First Ethertap device
            ...
         31 = /dev/tap15    16th Ethertap device
 36 block   MCA ESDI hard disk
          0 = /dev/eda      First ESDI disk whole disk
         64 = /dev/edb      Second ESDI disk whole disk
            ...

        Partitions are handled in the same way as IDE disks
        (see major number 3).

 37 char    IDE tape
          0 = /dev/ht0      First IDE tape
          1 = /dev/ht1      Second IDE tape
            ...
        128 = /dev/nht0     First IDE tape, no rewind-on-close
        129 = /dev/nht1     Second IDE tape, no rewind-on-close
            ...

        Currently, only one IDE tape drive is supported.

 37 block   Zorro II ramdisk
          0 = /dev/z2ram    Zorro II ramdisk

 38 char    Myricom PCI Myrinet board
          0 = /dev/mlanai0  First Myrinet board
          1 = /dev/mlanai1  Second Myrinet board
            ...

        This device is used for status query, board control
        and "user level packet I/O."  This board is also
        accessible as a standard networking "eth" device.

 38 block   Reserved for Linux/AP+

 39 char    ML-16P experimental I/O board
          0 = /dev/ml16pa-a0    First card, first analog channel
          1 = /dev/ml16pa-a1    First card, second analog channel
            ...
         15 = /dev/ml16pa-a15   First card, 16th analog channel
         16 = /dev/ml16pa-d First card, digital lines
         17 = /dev/ml16pa-c0    First card, first counter/timer
         18 = /dev/ml16pa-c1    First card, second counter/timer
         19 = /dev/ml16pa-c2    First card, third counter/timer
         32 = /dev/ml16pb-a0    Second card, first analog channel
         33 = /dev/ml16pb-a1    Second card, second analog channel
            ...
         47 = /dev/ml16pb-a15   Second card, 16th analog channel
         48 = /dev/ml16pb-d Second card, digital lines
         49 = /dev/ml16pb-c0    Second card, first counter/timer
         50 = /dev/ml16pb-c1    Second card, second counter/timer
         51 = /dev/ml16pb-c2    Second card, third counter/timer
              ...
 39 block   Reserved for Linux/AP+

 40 char    Matrox Meteor frame grabber {2.6}
          0 = /dev/mmetfgrab    Matrox Meteor frame grabber
 40 block   Syquest EZ135 parallel port removable drive
          0 = /dev/eza      Parallel EZ135 drive, whole disk

        This device is obsolete and will be removed in a
        future version of Linux.  It has been replaced with
        the parallel port IDE disk driver at major number 45.
        Partitions are handled in the same way as IDE disks
        (see major number 3).

 41 char    Yet Another Micro Monitor
          0 = /dev/yamm     Yet Another Micro Monitor
 41 block   MicroSolutions BackPack parallel port CD-ROM
          0 = /dev/bpcd     BackPack CD-ROM

        This device is obsolete and will be removed in a
        future version of Linux.  It has been replaced with
        the parallel port ATAPI CD-ROM driver at major number 46.

 42 char    Demo/sample use
 42 block   Demo/sample use

        This number is intended for use in sample code, as
        well as a general "example" device number.  It
        should never be used for a device driver that is being
        distributed; either obtain an official number or use
        the local/experimental range.  The sudden addition or
        removal of a driver with this number should not cause
        ill effects to the system (bugs excepted.)

        IN PARTICULAR, ANY DISTRIBUTION WHICH CONTAINS A
        DEVICE DRIVER USING MAJOR NUMBER 42 IS NONCOMPLIANT.

 43 char    isdn4linux virtual modem
          0 = /dev/ttyI0    First virtual modem
            ...
         63 = /dev/ttyI63   64th virtual modem
 43 block   Network block devices
          0 = /dev/nb0      First network block device
          1 = /dev/nb1      Second network block device
            ...

        Network Block Device is somehow similar to loopback
        devices: If you read from it, it sends packet across
        network asking server for data. If you write to it, it
        sends packet telling server to write. It could be used
        to mounting filesystems over the net, swapping over
        the net, implementing block device in userland etc.

 44 char    isdn4linux virtual modem - alternate devices
          0 = /dev/cui0     Callout device for ttyI0
            ...
         63 = /dev/cui63    Callout device for ttyI63
 44 block   Flash Translation Layer (FTL) filesystems
          0 = /dev/ftla     FTL on first Memory Technology Device
         16 = /dev/ftlb     FTL on second Memory Technology Device
         32 = /dev/ftlc     FTL on third Memory Technology Device
            ...
        240 = /dev/ftlp     FTL on 16th Memory Technology Device 

        Partitions are handled in the same way as for IDE
        disks (see major number 3) expect that the partition
        limit is 15 rather than 63 per disk (same as SCSI.)

 45 char    isdn4linux ISDN BRI driver
          0 = /dev/isdn0    First virtual B channel raw data
            ...
         63 = /dev/isdn63   64th virtual B channel raw data
         64 = /dev/isdnctrl0    First channel control/debug
            ...
        127 = /dev/isdnctrl63   64th channel control/debug

        128 = /dev/ippp0    First SyncPPP device
            ...
        191 = /dev/ippp63   64th SyncPPP device

        255 = /dev/isdninfo ISDN monitor interface
 45 block   Parallel port IDE disk devices
          0 = /dev/pda      First parallel port IDE disk
         16 = /dev/pdb      Second parallel port IDE disk
         32 = /dev/pdc      Third parallel port IDE disk
         48 = /dev/pdd      Fourth parallel port IDE disk

        Partitions are handled in the same way as for IDE
        disks (see major number 3) except that the partition
        limit is 15 rather than 63 per disk.

 46 char    Comtrol Rocketport serial card
          0 = /dev/ttyR0    First Rocketport port
          1 = /dev/ttyR1    Second Rocketport port
            ...
 46 block   Parallel port ATAPI CD-ROM devices
          0 = /dev/pcd0     First parallel port ATAPI CD-ROM
          1 = /dev/pcd1     Second parallel port ATAPI CD-ROM
          2 = /dev/pcd2     Third parallel port ATAPI CD-ROM
          3 = /dev/pcd3     Fourth parallel port ATAPI CD-ROM

 47 char    Comtrol Rocketport serial card - alternate devices
          0 = /dev/cur0     Callout device for ttyR0
          1 = /dev/cur1     Callout device for ttyR1
            ...
 47 block   Parallel port ATAPI disk devices
          0 = /dev/pf0      First parallel port ATAPI disk
          1 = /dev/pf1      Second parallel port ATAPI disk
          2 = /dev/pf2      Third parallel port ATAPI disk
          3 = /dev/pf3      Fourth parallel port ATAPI disk

        This driver is intended for floppy disks and similar
        devices and hence does not support partitioning.

 48 char    SDL RISCom serial card
          0 = /dev/ttyL0    First RISCom port
          1 = /dev/ttyL1    Second RISCom port
            ...
 48 block   Mylex DAC960 PCI RAID controller; first controller
          0 = /dev/rd/c0d0  First disk, whole disk
          8 = /dev/rd/c0d1  Second disk, whole disk
            ...
        248 = /dev/rd/c0d31 32nd disk, whole disk

        For partitions add:
          0 = /dev/rd/c?d?  Whole disk
          1 = /dev/rd/c?d?p1    First partition
            ...
          7 = /dev/rd/c?d?p7    Seventh partition

 49 char    SDL RISCom serial card - alternate devices
          0 = /dev/cul0     Callout device for ttyL0
          1 = /dev/cul1     Callout device for ttyL1
            ...
 49 block   Mylex DAC960 PCI RAID controller; second controller
          0 = /dev/rd/c1d0  First disk, whole disk
          8 = /dev/rd/c1d1  Second disk, whole disk
            ...
        248 = /dev/rd/c1d31 32nd disk, whole disk

        Partitions are handled as for major 48.

 50 char    Reserved for GLINT

 50 block   Mylex DAC960 PCI RAID controller; third controller
          0 = /dev/rd/c2d0  First disk, whole disk
          8 = /dev/rd/c2d1  Second disk, whole disk
            ...
        248 = /dev/rd/c2d31 32nd disk, whole disk

 51 char    Baycom radio modem OR Radio Tech BIM-XXX-RS232 radio modem
          0 = /dev/bc0      First Baycom radio modem
          1 = /dev/bc1      Second Baycom radio modem
            ...
 51 block   Mylex DAC960 PCI RAID controller; fourth controller
          0 = /dev/rd/c3d0  First disk, whole disk
          8 = /dev/rd/c3d1  Second disk, whole disk
            ...
        248 = /dev/rd/c3d31 32nd disk, whole disk

        Partitions are handled as for major 48.

 52 char    Spellcaster DataComm/BRI ISDN card
          0 = /dev/dcbri0   First DataComm card
          1 = /dev/dcbri1   Second DataComm card
          2 = /dev/dcbri2   Third DataComm card
          3 = /dev/dcbri3   Fourth DataComm card
 52 block   Mylex DAC960 PCI RAID controller; fifth controller
          0 = /dev/rd/c4d0  First disk, whole disk
          8 = /dev/rd/c4d1  Second disk, whole disk
            ...
        248 = /dev/rd/c4d31 32nd disk, whole disk

        Partitions are handled as for major 48.

 53 char    BDM interface for remote debugging MC683xx microcontrollers
          0 = /dev/pd_bdm0  PD BDM interface on lp0
          1 = /dev/pd_bdm1  PD BDM interface on lp1
          2 = /dev/pd_bdm2  PD BDM interface on lp2
          4 = /dev/icd_bdm0 ICD BDM interface on lp0
          5 = /dev/icd_bdm1 ICD BDM interface on lp1
          6 = /dev/icd_bdm2 ICD BDM interface on lp2

        This device is used for the interfacing to the MC683xx
        microcontrollers via Background Debug Mode by use of a
        Parallel Port interface. PD is the Motorola Public
        Domain Interface and ICD is the commercial interface
        by P&E.

 53 block   Mylex DAC960 PCI RAID controller; sixth controller
          0 = /dev/rd/c5d0  First disk, whole disk
          8 = /dev/rd/c5d1  Second disk, whole disk
            ...
        248 = /dev/rd/c5d31 32nd disk, whole disk

        Partitions are handled as for major 48.

 54 char    Electrocardiognosis Holter serial card
          0 = /dev/holter0  First Holter port
          1 = /dev/holter1  Second Holter port
          2 = /dev/holter2  Third Holter port

        A custom serial card used by Electrocardiognosis SRL
         to transfer data from Holter
        24-hour heart monitoring equipment.

 54 block   Mylex DAC960 PCI RAID controller; seventh controller
          0 = /dev/rd/c6d0  First disk, whole disk
          8 = /dev/rd/c6d1  Second disk, whole disk
            ...
        248 = /dev/rd/c6d31 32nd disk, whole disk

        Partitions are handled as for major 48.

 55 char    DSP56001 digital signal processor
          0 = /dev/dsp56k   First DSP56001
 55 block   Mylex DAC960 PCI RAID controller; eigth controller
          0 = /dev/rd/c7d0  First disk, whole disk
          8 = /dev/rd/c7d1  Second disk, whole disk
            ...
        248 = /dev/rd/c7d31 32nd disk, whole disk

        Partitions are handled as for major 48.

 56 char    Apple Desktop Bus
          0 = /dev/adb      ADB bus control

        Additional devices will be added to this number, all
        starting with /dev/adb.

 56 block   Fifth IDE hard disk/CD-ROM interface
          0 = /dev/hdi      Master: whole disk (or CD-ROM)
         64 = /dev/hdj      Slave: whole disk (or CD-ROM)

        Partitions are handled the same way as for the first
        interface (see major number 3).

 57 char    Hayes ESP serial card
          0 = /dev/ttyP0    First ESP port
          1 = /dev/ttyP1    Second ESP port
            ...

 57 block   Sixth IDE hard disk/CD-ROM interface
          0 = /dev/hdk      Master: whole disk (or CD-ROM)
         64 = /dev/hdl      Slave: whole disk (or CD-ROM)

        Partitions are handled the same way as for the first
        interface (see major number 3).

 58 char    Hayes ESP serial card - alternate devices
          0 = /dev/cup0     Callout device for ttyP0
          1 = /dev/cup1     Callout device for ttyP1
            ...
 58 block   Reserved for logical volume manager

 59 char    sf firewall package
          0 = /dev/firewall Communication with sf kernel module

 59 block   Generic PDA filesystem device
          0 = /dev/pda0     First PDA device
          1 = /dev/pda1     Second PDA device
            ...

        The pda devices are used to mount filesystems on
        remote pda's (basically slow handheld machines with
        proprietary OS's and limited memory and storage
        running small fs translation drivers) through serial /
        IRDA / parallel links.

        NAMING CONFLICT -- PROPOSED REVISED NAME /dev/rpda0 etc

 60-63 char LOCAL/EXPERIMENTAL USE
 60-63 block    LOCAL/EXPERIMENTAL USE
        Allocated for local/experimental use.  For devices not
        assigned official numbers, these ranges should be
        used in order to avoid conflicting with future assignments.

 64 char    ENskip kernel encryption package
          0 = /dev/enskip   Communication with ENskip kernel module

 64 block   Scramdisk/DriveCrypt encrypted devices
          0 = /dev/scramdisk/master    Master node for ioctls
          1 = /dev/scramdisk/1         First encrypted device
          2 = /dev/scramdisk/2         Second encrypted device
          ...
        255 = /dev/scramdisk/255       255th encrypted device

        The filename of the encrypted container and the passwords
        are sent via ioctls (using the sdmount tool) to the master
        node which then activates them via one of the
        /dev/scramdisk/x nodes for loopback mounting (all handled
        through the sdmount tool).

        Requested by: [email protected]

 65 char    Sundance "plink" Transputer boards (obsolete, unused)
          0 = /dev/plink0   First plink device
          1 = /dev/plink1   Second plink device
          2 = /dev/plink2   Third plink device
          3 = /dev/plink3   Fourth plink device
         64 = /dev/rplink0  First plink device, raw
         65 = /dev/rplink1  Second plink device, raw
         66 = /dev/rplink2  Third plink device, raw
         67 = /dev/rplink3  Fourth plink device, raw
        128 = /dev/plink0d  First plink device, debug
        129 = /dev/plink1d  Second plink device, debug
        130 = /dev/plink2d  Third plink device, debug
        131 = /dev/plink3d  Fourth plink device, debug
        192 = /dev/rplink0d First plink device, raw, debug
        193 = /dev/rplink1d Second plink device, raw, debug
        194 = /dev/rplink2d Third plink device, raw, debug
        195 = /dev/rplink3d Fourth plink device, raw, debug

        This is a commercial driver; contact James Howes
         for information.

 65 block   SCSI disk devices (16-31)
          0 = /dev/sdq      17th SCSI disk whole disk
         16 = /dev/sdr      18th SCSI disk whole disk
         32 = /dev/sds      19th SCSI disk whole disk
            ...
        240 = /dev/sdaf     32nd SCSI disk whole disk

        Partitions are handled in the same way as for IDE
        disks (see major number 3) except that the limit on
        partitions is 15.

 66 char    YARC PowerPC PCI coprocessor card
          0 = /dev/yppcpci0 First YARC card
          1 = /dev/yppcpci1 Second YARC card
            ...

 66 block   SCSI disk devices (32-47)
          0 = /dev/sdag     33th SCSI disk whole disk
         16 = /dev/sdah     34th SCSI disk whole disk
         32 = /dev/sdai     35th SCSI disk whole disk
            ...
        240 = /dev/sdav     48nd SCSI disk whole disk

        Partitions are handled in the same way as for IDE
        disks (see major number 3) except that the limit on
        partitions is 15.

 67 char    Coda network file system
          0 = /dev/cfs0     Coda cache manager

        See http://www.coda.cs.cmu.edu for information about Coda.

 67 block   SCSI disk devices (48-63)
          0 = /dev/sdaw     49th SCSI disk whole disk
         16 = /dev/sdax     50th SCSI disk whole disk
         32 = /dev/sday     51st SCSI disk whole disk
            ...
        240 = /dev/sdbl     64th SCSI disk whole disk

        Partitions are handled in the same way as for IDE
        disks (see major number 3) except that the limit on
        partitions is 15.

 68 char    CAPI 2.0 interface
          0 = /dev/capi20   Control device
          1 = /dev/capi20.00    First CAPI 2.0 application
          2 = /dev/capi20.01    Second CAPI 2.0 application
            ...
         20 = /dev/capi20.19    19th CAPI 2.0 application

        ISDN CAPI 2.0 driver for use with CAPI 2.0
        applications; currently supports the AVM B1 card.

 68 block   SCSI disk devices (64-79)
          0 = /dev/sdbm     65th SCSI disk whole disk
         16 = /dev/sdbn     66th SCSI disk whole disk
         32 = /dev/sdbo     67th SCSI disk whole disk
            ...
        240 = /dev/sdcb     80th SCSI disk whole disk

        Partitions are handled in the same way as for IDE
        disks (see major number 3) except that the limit on
        partitions is 15.

 69 char    MA16 numeric accelerator card
          0 = /dev/ma16     Board memory access

 69 block   SCSI disk devices (80-95)
          0 = /dev/sdcc     81st SCSI disk whole disk
         16 = /dev/sdcd     82nd SCSI disk whole disk
         32 = /dev/sdce     83th SCSI disk whole disk
            ...
        240 = /dev/sdcr     96th SCSI disk whole disk

        Partitions are handled in the same way as for IDE
        disks (see major number 3) except that the limit on
        partitions is 15.

 70 char    SpellCaster Protocol Services Interface
          0 = /dev/apscfg   Configuration interface
          1 = /dev/apsauth  Authentication interface
          2 = /dev/apslog   Logging interface
          3 = /dev/apsdbg   Debugging interface
         64 = /dev/apsisdn  ISDN command interface
         65 = /dev/apsasync Async command interface
        128 = /dev/apsmon   Monitor interface

 70 block   SCSI disk devices (96-111)
          0 = /dev/sdcs     97th SCSI disk whole disk
         16 = /dev/sdct     98th SCSI disk whole disk
         32 = /dev/sdcu     99th SCSI disk whole disk
            ...
        240 = /dev/sddh     112nd SCSI disk whole disk

        Partitions are handled in the same way as for IDE
        disks (see major number 3) except that the limit on
        partitions is 15.

 71 char    Computone IntelliPort II serial card
          0 = /dev/ttyF0    IntelliPort II board 0, port 0
          1 = /dev/ttyF1    IntelliPort II board 0, port 1
            ...
         63 = /dev/ttyF63   IntelliPort II board 0, port 63
         64 = /dev/ttyF64   IntelliPort II board 1, port 0
         65 = /dev/ttyF65   IntelliPort II board 1, port 1
            ...
        127 = /dev/ttyF127  IntelliPort II board 1, port 63
        128 = /dev/ttyF128  IntelliPort II board 2, port 0
        129 = /dev/ttyF129  IntelliPort II board 2, port 1
            ...
        191 = /dev/ttyF191  IntelliPort II board 2, port 63
        192 = /dev/ttyF192  IntelliPort II board 3, port 0
        193 = /dev/ttyF193  IntelliPort II board 3, port 1
            ...
        255 = /dev/ttyF255  IntelliPort II board 3, port 63

 71 block   SCSI disk devices (112-127)
          0 = /dev/sddi     113th SCSI disk whole disk
         16 = /dev/sddj     114th SCSI disk whole disk
         32 = /dev/sddk     115th SCSI disk whole disk
            ...
        240 = /dev/sddx     128th SCSI disk whole disk

        Partitions are handled in the same way as for IDE
        disks (see major number 3) except that the limit on
        partitions is 15.

 72 char    Computone IntelliPort II serial card - alternate devices
          0 = /dev/cuf0     Callout device for ttyF0
          1 = /dev/cuf1     Callout device for ttyF1
            ...
         63 = /dev/cuf63    Callout device for ttyF63
         64 = /dev/cuf64    Callout device for ttyF64
         65 = /dev/cuf65    Callout device for ttyF65
            ...
        127 = /dev/cuf127   Callout device for ttyF127
        128 = /dev/cuf128   Callout device for ttyF128
        129 = /dev/cuf129   Callout device for ttyF129
            ...
        191 = /dev/cuf191   Callout device for ttyF191
        192 = /dev/cuf192   Callout device for ttyF192
        193 = /dev/cuf193   Callout device for ttyF193
            ...
        255 = /dev/cuf255   Callout device for ttyF255

 72 block   Compaq Intelligent Drive Array, first controller
          0 = /dev/ida/c0d0 First logical drive whole disk
         16 = /dev/ida/c0d1 Second logical drive whole disk
            ...
        240 = /dev/ida/c0d15    16th logical drive whole disk

        Partitions are handled the same way as for Mylex
        DAC960 (see major number 48) except that the limit on
        partitions is 15.

 73 char    Computone IntelliPort II serial card - control devices
          0 = /dev/ip2ipl0  Loadware device for board 0
          1 = /dev/ip2stat0 Status device for board 0
          4 = /dev/ip2ipl1  Loadware device for board 1
          5 = /dev/ip2stat1 Status device for board 1
          8 = /dev/ip2ipl2  Loadware device for board 2
          9 = /dev/ip2stat2 Status device for board 2
         12 = /dev/ip2ipl3  Loadware device for board 3
         13 = /dev/ip2stat3 Status device for board 3

 73 block   Compaq Intelligent Drive Array, second controller
          0 = /dev/ida/c1d0 First logical drive whole disk
         16 = /dev/ida/c1d1 Second logical drive whole disk
            ...
        240 = /dev/ida/c1d15    16th logical drive whole disk

        Partitions are handled the same way as for Mylex
        DAC960 (see major number 48) except that the limit on
        partitions is 15.

 74 char    SCI bridge
          0 = /dev/SCI/0    SCI device 0
          1 = /dev/SCI/1    SCI device 1
            ...

        Currently for Dolphin Interconnect Solutions' PCI-SCI
        bridge.

 74 block   Compaq Intelligent Drive Array, third controller
          0 = /dev/ida/c2d0 First logical drive whole disk
         16 = /dev/ida/c2d1 Second logical drive whole disk
            ...
        240 = /dev/ida/c2d15    16th logical drive whole disk

        Partitions are handled the same way as for Mylex
        DAC960 (see major number 48) except that the limit on
        partitions is 15.

 75 char    Specialix IO8+ serial card
          0 = /dev/ttyW0    First IO8+ port, first card
          1 = /dev/ttyW1    Second IO8+ port, first card
            ...
          8 = /dev/ttyW8    First IO8+ port, second card
            ...

 75 block   Compaq Intelligent Drive Array, fourth controller
          0 = /dev/ida/c3d0 First logical drive whole disk
         16 = /dev/ida/c3d1 Second logical drive whole disk
            ...
        240 = /dev/ida/c3d15    16th logical drive whole disk

        Partitions are handled the same way as for Mylex
        DAC960 (see major number 48) except that the limit on
        partitions is 15.

 76 char    Specialix IO8+ serial card - alternate devices
          0 = /dev/cuw0     Callout device for ttyW0
          1 = /dev/cuw1     Callout device for ttyW1
            ...
          8 = /dev/cuw8     Callout device for ttyW8
            ...

 76 block   Compaq Intelligent Drive Array, fifth controller
          0 = /dev/ida/c4d0 First logical drive whole disk
         16 = /dev/ida/c4d1 Second logical drive whole disk
            ...
        240 = /dev/ida/c4d15    16th logical drive whole disk

        Partitions are handled the same way as for Mylex
        DAC960 (see major number 48) except that the limit on
        partitions is 15.


 77 char    ComScire Quantum Noise Generator
          0 = /dev/qng      ComScire Quantum Noise Generator

 77 block   Compaq Intelligent Drive Array, sixth controller
          0 = /dev/ida/c5d0 First logical drive whole disk
         16 = /dev/ida/c5d1 Second logical drive whole disk
            ...
        240 = /dev/ida/c5d15    16th logical drive whole disk

        Partitions are handled the same way as for Mylex
        DAC960 (see major number 48) except that the limit on
        partitions is 15.


 78 char    PAM Software's multimodem boards
          0 = /dev/ttyM0    First PAM modem
          1 = /dev/ttyM1    Second PAM modem
            ...

 78 block   Compaq Intelligent Drive Array, seventh controller
          0 = /dev/ida/c6d0 First logical drive whole disk
         16 = /dev/ida/c6d1 Second logical drive whole disk
            ...
        240 = /dev/ida/c6d15    16th logical drive whole disk

        Partitions are handled the same way as for Mylex
        DAC960 (see major number 48) except that the limit on
        partitions is 15.


 79 char    PAM Software's multimodem boards - alternate devices
          0 = /dev/cum0     Callout device for ttyM0
          1 = /dev/cum1     Callout device for ttyM1
            ...

 79 block   Compaq Intelligent Drive Array, eigth controller
          0 = /dev/ida/c7d0 First logical drive whole disk
         16 = /dev/ida/c7d1 Second logical drive whole disk
            ...
        240 = /dev/ida/c715 16th logical drive whole disk

        Partitions are handled the same way as for Mylex
        DAC960 (see major number 48) except that the limit on
        partitions is 15.


 80 char    Photometrics AT200 CCD camera
          0 = /dev/at200    Photometrics AT200 CCD camera

 80 block   I2O hard disk
          0 = /dev/i2o/hda  First I2O hard disk, whole disk
         16 = /dev/i2o/hdb  Second I2O hard disk, whole disk
            ...
        240 = /dev/i2o/hdp  16th I2O hard disk, whole disk

        Partitions are handled in the same way as for IDE
        disks (see major number 3) except that the limit on
        partitions is 15.

 81 char    video4linux
          0 = /dev/video0   Video capture/overlay device
            ...
         63 = /dev/video63  Video capture/overlay device
         64 = /dev/radio0   Radio device
            ...
        127 = /dev/radio63  Radio device
        192 = /dev/vtx0     Teletext device
            ...
        223 = /dev/vtx31    Teletext device
        224 = /dev/vbi0     Vertical blank interrupt
            ...
        255 = /dev/vbi31    Vertical blank interrupt

 81 block   I2O hard disk
          0 = /dev/i2o/hdq  17th I2O hard disk, whole disk
         16 = /dev/i2o/hdr  18th I2O hard disk, whole disk
            ...
        240 = /dev/i2o/hdaf 32nd I2O hard disk, whole disk

        Partitions are handled in the same way as for IDE
        disks (see major number 3) except that the limit on
        partitions is 15.

 82 char    WiNRADiO communications receiver card
          0 = /dev/winradio0    First WiNRADiO card
          1 = /dev/winradio1    Second WiNRADiO card
            ...

        The driver and documentation may be obtained from
        http://www.proximity.com.au/~brian/winradio/

 82 block   I2O hard disk
          0 = /dev/i2o/hdag 33rd I2O hard disk, whole disk
         16 = /dev/i2o/hdah 34th I2O hard disk, whole disk
            ...
        240 = /dev/i2o/hdav 48th I2O hard disk, whole disk

        Partitions are handled in the same way as for IDE
        disks (see major number 3) except that the limit on
        partitions is 15.

 83 char    Matrox mga_vid video driver 
         0 = /dev/mga_vid0  1st video card
         1 = /dev/mga_vid1  2nd video card
         2 = /dev/mga_vid2  3rd video card
          ...
            15 = /dev/mga_vid15 16th video card

 83 block   I2O hard disk
          0 = /dev/i2o/hdaw 49th I2O hard disk, whole disk
         16 = /dev/i2o/hdax 50th I2O hard disk, whole disk
            ...
        240 = /dev/i2o/hdbl 64th I2O hard disk, whole disk

        Partitions are handled in the same way as for IDE
        disks (see major number 3) except that the limit on
        partitions is 15.

 84 char    Ikon 1011[57] Versatec Greensheet Interface
          0 = /dev/ihcp0    First Greensheet port
          1 = /dev/ihcp1    Second Greensheet port

 84 block   I2O hard disk
          0 = /dev/i2o/hdbm 65th I2O hard disk, whole disk
         16 = /dev/i2o/hdbn 66th I2O hard disk, whole disk
            ...
        240 = /dev/i2o/hdcb 80th I2O hard disk, whole disk

        Partitions are handled in the same way as for IDE
        disks (see major number 3) except that the limit on
        partitions is 15.

 85 char    Linux/SGI shared memory input queue
          0 = /dev/shmiq    Master shared input queue
          1 = /dev/qcntl0   First device pushed
          2 = /dev/qcntl1   Second device pushed
            ...

 85 block   I2O hard disk
          0 = /dev/i2o/hdcc 81st I2O hard disk, whole disk
         16 = /dev/i2o/hdcd 82nd I2O hard disk, whole disk
            ...
        240 = /dev/i2o/hdcr 96th I2O hard disk, whole disk

        Partitions are handled in the same way as for IDE
        disks (see major number 3) except that the limit on
        partitions is 15.

 86 char    SCSI media changer
          0 = /dev/sch0     First SCSI media changer
          1 = /dev/sch1     Second SCSI media changer
            ...

 86 block   I2O hard disk
          0 = /dev/i2o/hdcs 97th I2O hard disk, whole disk
         16 = /dev/i2o/hdct 98th I2O hard disk, whole disk
            ...
        240 = /dev/i2o/hddh 112th I2O hard disk, whole disk

        Partitions are handled in the same way as for IDE
        disks (see major number 3) except that the limit on
        partitions is 15.

 87 char    Sony Control-A1 stereo control bus
          0 = /dev/controla0    First device on chain
          1 = /dev/controla1    Second device on chain
            ...

 87 block   I2O hard disk
          0 = /dev/i2o/hddi 113rd I2O hard disk, whole disk
         16 = /dev/i2o/hddj 114th I2O hard disk, whole disk
            ...
        240 = /dev/i2o/hddx 128th I2O hard disk, whole disk

        Partitions are handled in the same way as for IDE
        disks (see major number 3) except that the limit on
        partitions is 15.

 88 char    COMX synchronous serial card
          0 = /dev/comx0    COMX channel 0
          1 = /dev/comx1    COMX channel 1
            ...

 88 block   Seventh IDE hard disk/CD-ROM interface
          0 = /dev/hdm      Master: whole disk (or CD-ROM)
         64 = /dev/hdn      Slave: whole disk (or CD-ROM)

        Partitions are handled the same way as for the first
        interface (see major number 3).

 89 char    I2C bus interface
          0 = /dev/i2c-0    First I2C adapter
          1 = /dev/i2c-1    Second I2C adapter
            ...

 89 block   Eighth IDE hard disk/CD-ROM interface
          0 = /dev/hdo      Master: whole disk (or CD-ROM)
         64 = /dev/hdp      Slave: whole disk (or CD-ROM)

        Partitions are handled the same way as for the first
        interface (see major number 3).

 90 char    Memory Technology Device (RAM, ROM, Flash)
          0 = /dev/mtd0     First MTD (rw)
          1 = /dev/mtdr0    First MTD (ro)
            ...
         30 = /dev/mtd15    16th MTD (rw)
         31 = /dev/mtdr15   16th MTD (ro)

 90 block   Ninth IDE hard disk/CD-ROM interface
          0 = /dev/hdq      Master: whole disk (or CD-ROM)
         64 = /dev/hdr      Slave: whole disk (or CD-ROM)

        Partitions are handled the same way as for the first
        interface (see major number 3).

 91 char    CAN-Bus devices
          0 = /dev/can0     First CAN-Bus controller
          1 = /dev/can1     Second CAN-Bus controller
            ...

 91 block   Tenth IDE hard disk/CD-ROM interface
          0 = /dev/hds      Master: whole disk (or CD-ROM)
         64 = /dev/hdt      Slave: whole disk (or CD-ROM)

        Partitions are handled the same way as for the first
        interface (see major number 3).

 92 char    Reserved for ith Kommunikationstechnik MIC ISDN card

 92 block   PPDD encrypted disk driver
          0 = /dev/ppdd0    First encrypted disk
          1 = /dev/ppdd1    Second encrypted disk
            ...

        Partitions are handled in the same way as for IDE
        disks (see major number 3) except that the limit on
        partitions is 15.

 93 char    IBM Smart Capture Card frame grabber {2.6}
          0 = /dev/iscc0    First Smart Capture Card
          1 = /dev/iscc1    Second Smart Capture Card
            ...
        128 = /dev/isccctl0 First Smart Capture Card control
        129 = /dev/isccctl1 Second Smart Capture Card control
            ...

 93 block   NAND Flash Translation Layer filesystem
          0 = /dev/nftla    First NFTL layer
         16 = /dev/nftlb    Second NFTL layer
            ...
        240 = /dev/nftlp    16th NTFL layer

 94 char    miroVIDEO DC10/30 capture/playback device {2.6}
          0 = /dev/dcxx0    First capture card
          1 = /dev/dcxx1    Second capture card
            ...

 94 block IBM S/390 DASD block storage
              0 = /dev/dasda First DASD device, major
              1 = /dev/dasda1 First DASD device, block 1
              2 = /dev/dasda2 First DASD device, block 2
              3 = /dev/dasda3 First DASD device, block 3
              4 = /dev/dasdb Second DASD device, major
              5 = /dev/dasdb1 Second DASD device, block 1
              6 = /dev/dasdb2 Second DASD device, block 2
              7 = /dev/dasdb3 Second DASD device, block 3
            ...

 95 char    IP filter
          0 = /dev/ipl      Filter control device/log file
          1 = /dev/ipnat    NAT control device/log file
          2 = /dev/ipstate  State information log file
          3 = /dev/ipauth   Authentication control device/log file
            ...     

 96 char    Parallel port ATAPI tape devices
          0 = /dev/pt0      First parallel port ATAPI tape
          1 = /dev/pt1      Second parallel port ATAPI tape
            ...
        128 = /dev/npt0     First p.p. ATAPI tape, no rewind
        129 = /dev/npt1     Second p.p. ATAPI tape, no rewind
            ...

 96 block Inverse NAND Flash Translation Layer
          0 = /dev/inftla First INFTL layer
         16 = /dev/inftlb Second INFTL layer
            ...
        240 = /dev/inftlp   16th INTFL layer

 97 char    Parallel port generic ATAPI interface
          0 = /dev/pg0      First parallel port ATAPI device
          1 = /dev/pg1      Second parallel port ATAPI device
          2 = /dev/pg2      Third parallel port ATAPI device
          3 = /dev/pg3      Fourth parallel port ATAPI device

        These devices support the same API as the generic SCSI
        devices.

 97 block   Packet writing for CD/DVD devices
          0 = /dev/pktcdvd0 First packet-writing module
          1 = /dev/pktcdvd1 Second packet-writing module
            ...

 98 char    Control and Measurement Device (comedi)
          0 = /dev/comedi0  First comedi device
          1 = /dev/comedi1  Second comedi device
            ...

        See http://stm.lbl.gov/comedi or http://www.llp.fu-berlin.de/.

 98 block   User-mode virtual block device
          0 = /dev/ubda     First user-mode block device
         16 = /dev/udbb     Second user-mode block device
            ...
        
        Partitions are handled in the same way as for IDE
        disks (see major number 3) except that the limit on
        partitions is 15.

        This device is used by the user-mode virtual kernel port.

 99 char    Raw parallel ports
          0 = /dev/parport0 First parallel port
          1 = /dev/parport1 Second parallel port
            ...

 99 block   JavaStation flash disk
          0 = /dev/jsfd     JavaStation flash disk

100 char    Telephony for Linux
          0 = /dev/phone0   First telephony device
          1 = /dev/phone1   Second telephony device
            ...

101 char    Motorola DSP 56xxx board
          0 = /dev/mdspstat Status information
          1 = /dev/mdsp1    First DSP board I/O controls
            ...
         16 = /dev/mdsp16   16th DSP board I/O controls

101 block   AMI HyperDisk RAID controller
          0 = /dev/amiraid/ar0  First array whole disk
         16 = /dev/amiraid/ar1  Second array whole disk
            ...
        240 = /dev/amiraid/ar15 16th array whole disk

        For each device, partitions are added as:
          0 = /dev/amiraid/ar?    Whole disk
          1 = /dev/amiraid/ar?p1  First partition
          2 = /dev/amiraid/ar?p2  Second partition
            ...
         15 = /dev/amiraid/ar?p15 15th partition

102 char    Philips SAA5249 Teletext signal decoder {2.6}
          0 = /dev/tlk0     First Teletext decoder
          1 = /dev/tlk1     Second Teletext decoder
          2 = /dev/tlk2     Third Teletext decoder
          3 = /dev/tlk3     Fourth Teletext decoder

102 block   Compressed block device
          0 = /dev/cbd/a    First compressed block device, whole device
         16 = /dev/cbd/b    Second compressed block device, whole device
            ...
        240 = /dev/cbd/p    16th compressed block device, whole device

        Partitions are handled in the same way as for IDE
        disks (see major number 3) except that the limit on
        partitions is 15.

103 char    Arla network file system
          0 = /dev/nnpfs0   First NNPFS device
          1 = /dev/nnpfs1   Second NNPFS device

        Arla is a free clone of the Andrew File System, AFS.
        The NNPFS device gives user mode filesystem
        implementations a kernel presence for caching and easy
        mounting.  For more information about the project,
        write to  or see
        http://www.stacken.kth.se/project/arla/

103 block   Audit device
          0 = /dev/audit    Audit device

104 char    Flash BIOS support

104 block   Compaq Next Generation Drive Array, first controller
          0 = /dev/cciss/c0d0   First logical drive, whole disk
         16 = /dev/cciss/c0d1   Second logical drive, whole disk
            ...
        240 = /dev/cciss/c0d15  16th logical drive, whole disk

        Partitions are handled the same way as for Mylex
        DAC960 (see major number 48) except that the limit on
        partitions is 15.

105 char    Comtrol VS-1000 serial controller
          0 = /dev/ttyV0    First VS-1000 port
          1 = /dev/ttyV1    Second VS-1000 port
            ...

105 block   Compaq Next Generation Drive Array, second controller
          0 = /dev/cciss/c1d0   First logical drive, whole disk
         16 = /dev/cciss/c1d1   Second logical drive, whole disk
            ...
        240 = /dev/cciss/c1d15  16th logical drive, whole disk

        Partitions are handled the same way as for Mylex
        DAC960 (see major number 48) except that the limit on
        partitions is 15.

106 char    Comtrol VS-1000 serial controller - alternate devices
          0 = /dev/cuv0     First VS-1000 port
          1 = /dev/cuv1     Second VS-1000 port
            ...

106 block   Compaq Next Generation Drive Array, third controller
          0 = /dev/cciss/c2d0   First logical drive, whole disk
         16 = /dev/cciss/c2d1   Second logical drive, whole disk
            ...
        240 = /dev/cciss/c2d15  16th logical drive, whole disk

        Partitions are handled the same way as for Mylex
        DAC960 (see major number 48) except that the limit on
        partitions is 15.

107 char    3Dfx Voodoo Graphics device
          0 = /dev/3dfx     Primary 3Dfx graphics device

107 block   Compaq Next Generation Drive Array, fourth controller
          0 = /dev/cciss/c3d0   First logical drive, whole disk
         16 = /dev/cciss/c3d1   Second logical drive, whole disk
            ...
        240 = /dev/cciss/c3d15  16th logical drive, whole disk

        Partitions are handled the same way as for Mylex
        DAC960 (see major number 48) except that the limit on
        partitions is 15.

108 char    Device independent PPP interface
          0 = /dev/ppp      Device independent PPP interface

108 block   Compaq Next Generation Drive Array, fifth controller
          0 = /dev/cciss/c4d0   First logical drive, whole disk
         16 = /dev/cciss/c4d1   Second logical drive, whole disk
            ...
        240 = /dev/cciss/c4d15  16th logical drive, whole disk

        Partitions are handled the same way as for Mylex
        DAC960 (see major number 48) except that the limit on
        partitions is 15.

109 char    Reserved for logical volume manager

109 block   Compaq Next Generation Drive Array, sixth controller
          0 = /dev/cciss/c5d0   First logical drive, whole disk
         16 = /dev/cciss/c5d1   Second logical drive, whole disk
            ...
        240 = /dev/cciss/c5d15  16th logical drive, whole disk

        Partitions are handled the same way as for Mylex
        DAC960 (see major number 48) except that the limit on
        partitions is 15.

110 char    miroMEDIA Surround board
          0 = /dev/srnd0    First miroMEDIA Surround board
          1 = /dev/srnd1    Second miroMEDIA Surround board
            ...

110 block   Compaq Next Generation Drive Array, seventh controller
          0 = /dev/cciss/c6d0   First logical drive, whole disk
         16 = /dev/cciss/c6d1   Second logical drive, whole disk
            ...
        240 = /dev/cciss/c6d15  16th logical drive, whole disk

        Partitions are handled the same way as for Mylex
        DAC960 (see major number 48) except that the limit on
        partitions is 15.

111 char    Philips SAA7146-based audio/video card {2.6}
          0 = /dev/av0      First A/V card
          1 = /dev/av1      Second A/V card
            ...

111 block   Compaq Next Generation Drive Array, eigth controller
          0 = /dev/cciss/c7d0   First logical drive, whole disk
         16 = /dev/cciss/c7d1   Second logical drive, whole disk
            ...
        240 = /dev/cciss/c7d15  16th logical drive, whole disk

        Partitions are handled the same way as for Mylex
        DAC960 (see major number 48) except that the limit on
        partitions is 15.

112 char    ISI serial card
          0 = /dev/ttyM0    First ISI port
          1 = /dev/ttyM1    Second ISI port
            ...

        There is currently a device-naming conflict between
        these and PAM multimodems (major 78).

112 block   IBM iSeries virtual disk
          0 = /dev/iseries/vda  First virtual disk, whole disk
          8 = /dev/iseries/vdb  Second virtual disk, whole disk
            ...
        200 = /dev/iseries/vdz  26th virtual disk, whole disk
        208 = /dev/iseries/vdaa 27th virtual disk, whole disk
            ...
        248 = /dev/iseries/vdaf 32nd virtual disk, whole disk

        Partitions are handled in the same way as for IDE
        disks (see major number 3) except that the limit on
        partitions is 7.

113 char    ISI serial card - alternate devices
          0 = /dev/cum0     Callout device for ttyM0
          1 = /dev/cum1     Callout device for ttyM1
            ...

113 block   IBM iSeries virtual CD-ROM

          0 = /dev/iseries/vcda First virtual CD-ROM
          1 = /dev/iseries/vcdb Second virtual CD-ROM
            ...

114 char    Picture Elements ISE board
          0 = /dev/ise0     First ISE board
          1 = /dev/ise1     Second ISE board
            ...
        128 = /dev/isex0    Control node for first ISE board
        129 = /dev/isex1    Control node for second ISE board
            ...

        The ISE board is an embedded computer, optimized for
        image processing. The /dev/iseN nodes are the general
        I/O access to the board, the /dev/isex0 nodes command
        nodes used to control the board.

114 block       IDE BIOS powered software RAID interfaces such as the
                Promise Fastrak

                  0 = /dev/ataraid/d0
                  1 = /dev/ataraid/d0p1
                  2 = /dev/ataraid/d0p2
                  ...
                 16 = /dev/ataraid/d1
                 17 = /dev/ataraid/d1p1
                 18 = /dev/ataraid/d1p2
                  ...
                255 = /dev/ataraid/d15p15

        Partitions are handled in the same way as for IDE
        disks (see major number 3) except that the limit on
        partitions is 15.

115 char    TI link cable devices (115 was formerly the console driver speaker)
          0 = /dev/tipar0    Parallel cable on first parallel port
          ...
          7 = /dev/tipar7    Parallel cable on seventh parallel port

          8 = /dev/tiser0    Serial cable on first serial port
          ...
         15 = /dev/tiser7    Serial cable on seventh serial port

         16 = /dev/tiusb0    First USB cable
          ...
         47 = /dev/tiusb31   32nd USB cable

115 block       NetWare (NWFS) Devices (0-255)

                The NWFS (NetWare) devices are used to present a
                collection of NetWare Mirror Groups or NetWare
                Partitions as a logical storage segment for
                use in mounting NetWare volumes.  A maximum of
                256 NetWare volumes can be supported in a single
                machine.

                http://www.kernel.org/pub/linux/kernel/people/jmerkey/nwfs

                0 = /dev/nwfs/v0    First NetWare (NWFS) Logical Volume
                1 = /dev/nwfs/v1    Second NetWare (NWFS) Logical Volume
                2 = /dev/nwfs/v2    Third NetWare (NWFS) Logical Volume
                      ...
                255 = /dev/nwfs/v255    Last NetWare (NWFS) Logical Volume

116 char    Advanced Linux Sound Driver (ALSA)

116 block       MicroMemory battery backed RAM adapter (NVRAM)
                Supports 16 boards, 15 paritions each.
                Requested by neilb at cse.unsw.edu.au.

         0 = /dev/umem/d0      Whole of first board
         1 = /dev/umem/d0p1    First partition of first board
         2 = /dev/umem/d0p2    Second partition of first board
        15 = /dev/umem/d0p15   15th partition of first board

        16 = /dev/umem/d1      Whole of second board
        17 = /dev/umem/d1p1    First partition of second board
            ...
        255= /dev/umem/d15p15  15th partition of 16th board.

117 char    COSA/SRP synchronous serial card
          0 = /dev/cosa0c0  1st board, 1st channel
          1 = /dev/cosa0c1  1st board, 2nd channel
            ...
         16 = /dev/cosa1c0  2nd board, 1st channel
         17 = /dev/cosa1c1  2nd board, 2nd channel
            ...

117 block       Enterprise Volume Management System (EVMS)

                The EVMS driver uses a layered, plug-in model to provide
                unparalleled flexibility and extensibility in managing
                storage.  This allows for easy expansion or customization
                of various levels of volume management.  Requested by
                Mark Peloquin (peloquin at us.ibm.com).

                Note: EVMS populates and manages all the devnodes in
                /dev/evms.

                http://sf.net/projects/evms

                  0 = /dev/evms/block_device   EVMS block device
                  1 = /dev/evms/legacyname1    First EVMS legacy device
                  2 = /dev/evms/legacyname2    Second EVMS legacy device
                    ...
                    Both ranges can grow (down or up) until they meet.
                    ...
                254 = /dev/evms/EVMSname2      Second EVMS native device
                255 = /dev/evms/EVMSname1      First EVMS native device

                Note: legacyname(s) are derived from the normal legacy
                device names.  For example, /dev/hda5 would become
                /dev/evms/hda5.

118 char    IBM Cryptographic Accelerator
          0 = /dev/ica  Virtual interface to all IBM Crypto Accelerators
          1 = /dev/ica0 IBMCA Device 0
          2 = /dev/ica1 IBMCA Device 1
            ...

119 char    VMware virtual network control
          0 = /dev/vnet0    1st virtual network
          1 = /dev/vnet1    2nd virtual network
            ...

120-127 char    LOCAL/EXPERIMENTAL USE
120-127 block   LOCAL/EXPERIMENTAL USE
        Allocated for local/experimental use.  For devices not
        assigned official numbers, these ranges should be
        used in order to avoid conflicting with future assignments.

128-135 char    Unix98 PTY masters

        These devices should not have corresponding device
        nodes; instead they should be accessed through the
        /dev/ptmx cloning interface.


128 block       SCSI disk devices (128-143)
                  0 = /dev/sddy         129th SCSI disk whole disk
                 16 = /dev/sddz         130th SCSI disk whole disk
                 32 = /dev/sdea         131th SCSI disk whole disk
                    ...
                240 = /dev/sden         144th SCSI disk whole disk

        Partitions are handled in the same way as for IDE
        disks (see major number 3) except that the limit on
        partitions is 15.


129 block       SCSI disk devices (144-159)
                  0 = /dev/sdeo         145th SCSI disk whole disk
                 16 = /dev/sdep         146th SCSI disk whole disk
                 32 = /dev/sdeq         147th SCSI disk whole disk
                    ...
                240 = /dev/sdfd         160th SCSI disk whole disk

        Partitions are handled in the same way as for IDE
        disks (see major number 3) except that the limit on
        partitions is 15.

130 char    (Misc devices)

130 block       SCSI disk devices (160-175)
                  0 = /dev/sdfe         161st SCSI disk whole disk
                 16 = /dev/sdff         162nd SCSI disk whole disk
                 32 = /dev/sdfg         163rd SCSI disk whole disk
                    ...
                240 = /dev/sdft         176th SCSI disk whole disk

        Partitions are handled in the same way as for IDE
        disks (see major number 3) except that the limit on
        partitions is 15.

131 block       SCSI disk devices (176-191)
                  0 = /dev/sdfu         177th SCSI disk whole disk
                 16 = /dev/sdfv         178th SCSI disk whole disk
                 32 = /dev/sdfw         179th SCSI disk whole disk
                    ...
                240 = /dev/sdgj         192nd SCSI disk whole disk

        Partitions are handled in the same way as for IDE
        disks (see major number 3) except that the limit on
        partitions is 15.


132 block       SCSI disk devices (192-207)
                  0 = /dev/sdgk         193rd SCSI disk whole disk
                 16 = /dev/sdgl         194th SCSI disk whole disk
                 32 = /dev/sdgm         195th SCSI disk whole disk
                    ...
                240 = /dev/sdgz         208th SCSI disk whole disk

        Partitions are handled in the same way as for IDE
        disks (see major number 3) except that the limit on
        partitions is 15.


133 block       SCSI disk devices (208-223)
                  0 = /dev/sdha         209th SCSI disk whole disk
                 16 = /dev/sdhb         210th SCSI disk whole disk
                 32 = /dev/sdhc         211th SCSI disk whole disk
                    ...
                240 = /dev/sdhp         224th SCSI disk whole disk

        Partitions are handled in the same way as for IDE
        disks (see major number 3) except that the limit on
        partitions is 15.


134 block       SCSI disk devices (224-239)
                  0 = /dev/sdhq         225th SCSI disk whole disk
                 16 = /dev/sdhr         226th SCSI disk whole disk
                 32 = /dev/sdhs         227th SCSI disk whole disk
                    ...
                240 = /dev/sdif         240th SCSI disk whole disk

        Partitions are handled in the same way as for IDE
        disks (see major number 3) except that the limit on
        partitions is 15.


135 block       SCSI disk devices (240-255)
                  0 = /dev/sdig         241st SCSI disk whole disk
                 16 = /dev/sdih         242nd SCSI disk whole disk
                 32 = /dev/sdih         243rd SCSI disk whole disk
                    ...
                240 = /dev/sdiv         256th SCSI disk whole disk

        Partitions are handled in the same way as for IDE
        disks (see major number 3) except that the limit on
        partitions is 15.


136-143 char    Unix98 PTY slaves
          0 = /dev/pts/0    First Unix98 pseudo-TTY
          1 = /dev/pts/1    Second Unix98 pesudo-TTY
            ...

        These device nodes are automatically generated with
        the proper permissions and modes by mounting the
        devpts filesystem onto /dev/pts with the appropriate
        mount options (distribution dependent, however, on
        *most* distributions the appropriate options are
        "mode=0620,gid=".)

136 block   Mylex DAC960 PCI RAID controller; ninth controller
          0 = /dev/rd/c8d0  First disk, whole disk
          8 = /dev/rd/c8d1  Second disk, whole disk
            ...
        248 = /dev/rd/c8d31 32nd disk, whole disk

        Partitions are handled as for major 48.

137 block   Mylex DAC960 PCI RAID controller; tenth controller
          0 = /dev/rd/c9d0  First disk, whole disk
          8 = /dev/rd/c9d1  Second disk, whole disk
            ...
        248 = /dev/rd/c9d31 32nd disk, whole disk

        Partitions are handled as for major 48.

138 block   Mylex DAC960 PCI RAID controller; eleventh controller
          0 = /dev/rd/c10d0 First disk, whole disk
          8 = /dev/rd/c10d1 Second disk, whole disk
            ...
        248 = /dev/rd/c10d31    32nd disk, whole disk

        Partitions are handled as for major 48.

139 block   Mylex DAC960 PCI RAID controller; twelfth controller
          0 = /dev/rd/c11d0 First disk, whole disk
          8 = /dev/rd/c11d1 Second disk, whole disk
            ...
        248 = /dev/rd/c11d31    32nd disk, whole disk

        Partitions are handled as for major 48.

140 block   Mylex DAC960 PCI RAID controller; thirteenth controller
          0 = /dev/rd/c12d0 First disk, whole disk
          8 = /dev/rd/c12d1 Second disk, whole disk
            ...
        248 = /dev/rd/c12d31    32nd disk, whole disk

        Partitions are handled as for major 48.

141 block   Mylex DAC960 PCI RAID controller; fourteenth controller
          0 = /dev/rd/c13d0 First disk, whole disk
          8 = /dev/rd/c13d1 Second disk, whole disk
            ...
        248 = /dev/rd/c13d31    32nd disk, whole disk

        Partitions are handled as for major 48.

142 block   Mylex DAC960 PCI RAID controller; fifteenth controller
          0 = /dev/rd/c14d0 First disk, whole disk
          8 = /dev/rd/c14d1 Second disk, whole disk
            ...
        248 = /dev/rd/c14d31    32nd disk, whole disk

        Partitions are handled as for major 48.

143 block   Mylex DAC960 PCI RAID controller; sixteenth controller
          0 = /dev/rd/c15d0 First disk, whole disk
          8 = /dev/rd/c15d1 Second disk, whole disk
            ...
        248 = /dev/rd/c15d31    32nd disk, whole disk

        Partitions are handled as for major 48.

144 char    Encapsulated PPP
          0 = /dev/pppox0   First PPP over Ethernet
            ...
         63 = /dev/pppox63  64th PPP over Ethernet

        This is primarily used for ADSL.

        The SST 5136-DN DeviceNet interface driver has been
        relocated to major 183 due to an unfortunate conflict.

144 block   Expansion Area #1 for more non-device (e.g. NFS) mounts
          0 = mounted device 256
        255 = mounted device 511

145 char    SAM9407-based soundcard
          0 = /dev/sam0_mixer
          1 = /dev/sam0_sequencer
          2 = /dev/sam0_midi00
          3 = /dev/sam0_dsp
          4 = /dev/sam0_audio
          6 = /dev/sam0_sndstat
         18 = /dev/sam0_midi01
         34 = /dev/sam0_midi02
         50 = /dev/sam0_midi03
         64 = /dev/sam1_mixer
            ...
        128 = /dev/sam2_mixer
            ...
        192 = /dev/sam3_mixer
            ...

        Device functions match OSS, but offer a number of
        addons, which are sam9407 specific.  OSS can be
        operated simultaneously, taking care of the codec.

145 block   Expansion Area #2 for more non-device (e.g. NFS) mounts
          0 = mounted device 512
        255 = mounted device 767

146 char    SYSTRAM SCRAMNet mirrored-memory network
          0 = /dev/scramnet0    First SCRAMNet device
          1 = /dev/scramnet1    Second SCRAMNet device
            ...

146 block   Expansion Area #3 for more non-device (e.g. NFS) mounts
          0 = mounted device 768
        255 = mounted device 1023

147 char    Aureal Semiconductor Vortex Audio device
          0 = /dev/aureal0  First Aureal Vortex
          1 = /dev/aureal1  Second Aureal Vortex
            ...

147 block   Distributed Replicated Block Device (DRBD)
          0 = /dev/drbd0    First DRBD device
          1 = /dev/drbd1    Second DRBD device
            ...
        
148 char    Technology Concepts serial card
          0 = /dev/ttyT0    First TCL port
          1 = /dev/ttyT1    Second TCL port
            ...

149 char    Technology Concepts serial card - alternate devices
          0 = /dev/cut0     Callout device for ttyT0
          1 = /dev/cut0     Callout device for ttyT1
            ...

150 char    Real-Time Linux FIFOs
          0 = /dev/rtf0     First RTLinux FIFO
          1 = /dev/rtf1     Second RTLinux FIFO
            ...

151 char    DPT I2O SmartRaid V controller
          0 = /dev/dpti0    First DPT I2O adapter
          1 = /dev/dpti1    Second DPT I2O adapter
            ...

152 char    EtherDrive Control Device
          0 = /dev/etherd/ctl   Connect/Disconnect an EtherDrive
          1 = /dev/etherd/err   Monitor errors
          2 = /dev/etherd/raw   Raw AoE packet monitor

152 block   EtherDrive Block Devices
          0 = /dev/etherd/0 EtherDrive 0
            ...
        255 = /dev/etherd/255   EtherDrive 255

153 char    SPI Bus Interface (sometimes referred to as MicroWire)
          0 = /dev/spi0     First SPI device on the bus
          1 = /dev/spi1     Second SPI device on the bus
            ...
         15 = /dev/spi15    Sixteenth SPI device on the bus

153 block   Enhanced Metadisk RAID (EMD) storage units
          0 = /dev/emd/0    First unit
          1 = /dev/emd/0p1  Partition 1 on First unit
          2 = /dev/emd/0p2  Partition 2 on First unit
            ...
         15 = /dev/emd/0p15 Partition 15 on First unit

         16 = /dev/emd/1    Second unit
         32 = /dev/emd/2    Third unit
            ...
        240 = /dev/emd/15   Sixteenth unit

        Partitions are handled in the same way as for IDE
        disks (see major number 3) except that the limit on
        partitions is 15.

154 char    Specialix RIO serial card
          0 = /dev/ttySR0   First RIO port
            ...
        255 = /dev/ttySR255 256th RIO port

155 char    Specialix RIO serial card - alternate devices
          0 = /dev/cusr0    Callout device for ttySR0
            ...
        255 = /dev/cusr255  Callout device for ttySR255

156 char    Specialix RIO serial card
          0 = /dev/ttySR256 257th RIO port
            ...
        255 = /dev/ttySR511 512th RIO port

157 char    Specialix RIO serial card - alternate devices
          0 = /dev/cusr256  Callout device for ttySR256
            ...
        255 = /dev/cusr511  Callout device for ttySR511

158 char    Dialogic GammaLink fax driver
          0 = /dev/gfax0    GammaLink channel 0
          1 = /dev/gfax1    GammaLink channel 1
            ...

159 char    RESERVED
159 block   RESERVED

160 char    General Purpose Instrument Bus (GPIB)
          0 = /dev/gpib0    First GPIB bus
          1 = /dev/gpib1    Second GPIB bus
            ...

160 block       Carmel 8-port SATA Disks on First Controller
          0 = /dev/carmel/0     SATA disk 0 whole disk
          1 = /dev/carmel/0p1   SATA disk 0 partition 1
            ...
         31 = /dev/carmel/0p31  SATA disk 0 partition 31

         32 = /dev/carmel/1     SATA disk 1 whole disk
         64 = /dev/carmel/2     SATA disk 2 whole disk
            ...
        224 = /dev/carmel/7     SATA disk 7 whole disk

        Partitions are handled in the same way as for IDE
        disks (see major number 3) except that the limit on
        partitions is 31.

161 char    IrCOMM devices (IrDA serial/parallel emulation)
          0 = /dev/ircomm0  First IrCOMM device
          1 = /dev/ircomm1  Second IrCOMM device
            ...
         16 = /dev/irlpt0   First IrLPT device
         17 = /dev/irlpt1   Second IrLPT device
            ...

161 block       Carmel 8-port SATA Disks on Second Controller
          0 = /dev/carmel/8     SATA disk 8 whole disk
          1 = /dev/carmel/8p1   SATA disk 8 partition 1
            ...
         31 = /dev/carmel/8p31  SATA disk 8 partition 31

         32 = /dev/carmel/9     SATA disk 9 whole disk
         64 = /dev/carmel/10    SATA disk 10 whole disk
            ...
        224 = /dev/carmel/15    SATA disk 15 whole disk

        Partitions are handled in the same way as for IDE
        disks (see major number 3) except that the limit on
        partitions is 31. 

162 char    Raw block device interface
          0 = /dev/rawctl   Raw I/O control device
          1 = /dev/raw/raw1 First raw I/O device
          2 = /dev/raw/raw2 Second raw I/O device
            ...

163 char    UNASSIGNED (was Radio Tech BIM-XXX-RS232 radio modem - see 51)

164 char    Chase Research AT/PCI-Fast serial card
          0 = /dev/ttyCH0   AT/PCI-Fast board 0, port 0
            ...
         15 = /dev/ttyCH15  AT/PCI-Fast board 0, port 15
         16 = /dev/ttyCH16  AT/PCI-Fast board 1, port 0
            ...
         31 = /dev/ttyCH31  AT/PCI-Fast board 1, port 15
         32 = /dev/ttyCH32  AT/PCI-Fast board 2, port 0
            ...
         47 = /dev/ttyCH47  AT/PCI-Fast board 2, port 15
         48 = /dev/ttyCH48  AT/PCI-Fast board 3, port 0
            ...
         63 = /dev/ttyCH63  AT/PCI-Fast board 3, port 15

165 char    Chase Research AT/PCI-Fast serial card - alternate devices
          0 = /dev/cuch0    Callout device for ttyCH0
            ...
         63 = /dev/cuch63   Callout device for ttyCH63

166 char    ACM USB modems
          0 = /dev/ttyACM0  First ACM modem
          1 = /dev/ttyACM1  Second ACM modem
            ...

167 char    ACM USB modems - alternate devices
          0 = /dev/cuacm0   Callout device for ttyACM0
          1 = /dev/cuacm1   Callout device for ttyACM1
            ...

168 char    Eracom CSA7000 PCI encryption adaptor
          0 = /dev/ecsa0    First CSA7000
          1 = /dev/ecsa1    Second CSA7000
            ...

169 char    Eracom CSA8000 PCI encryption adaptor
          0 = /dev/ecsa8-0  First CSA8000
          1 = /dev/ecsa8-1  Second CSA8000
            ...

170 char    AMI MegaRAC remote access controller
          0 = /dev/megarac0 First MegaRAC card
          1 = /dev/megarac1 Second MegaRAC card
            ...

171 char    Reserved for IEEE 1394 (Firewire)


172 char    Moxa Intellio serial card
          0 = /dev/ttyMX0   First Moxa port
          1 = /dev/ttyMX1   Second Moxa port
            ...
        127 = /dev/ttyMX127 128th Moxa port
        128 = /dev/moxactl  Moxa control port

173 char    Moxa Intellio serial card - alternate devices
          0 = /dev/cumx0    Callout device for ttyMX0
          1 = /dev/cumx1    Callout device for ttyMX1
            ...
        127 = /dev/cumx127  Callout device for ttyMX127

174 char    SmartIO serial card
          0 = /dev/ttySI0   First SmartIO port
          1 = /dev/ttySI1   Second SmartIO port
            ...

175 char    SmartIO serial card - alternate devices
          0 = /dev/cusi0    Callout device for ttySI0
          1 = /dev/cusi1    Callout device for ttySI1
            ...

176 char    nCipher nFast PCI crypto accelerator
          0 = /dev/nfastpci0    First nFast PCI device
          1 = /dev/nfastpci1    First nFast PCI device
            ...

177 char    TI PCILynx memory spaces
          0 = /dev/pcilynx/aux0  AUX space of first PCILynx card
            ...
         15 = /dev/pcilynx/aux15 AUX space of 16th PCILynx card
         16 = /dev/pcilynx/rom0  ROM space of first PCILynx card
            ...
         31 = /dev/pcilynx/rom15 ROM space of 16th PCILynx card
         32 = /dev/pcilynx/ram0  RAM space of first PCILynx card
            ...
         47 = /dev/pcilynx/ram15 RAM space of 16th PCILynx card

178 char    Giganet cLAN1xxx virtual interface adapter
          0 = /dev/clanvi0  First cLAN adapter
          1 = /dev/clanvi1  Second cLAN adapter
            ...

179 char    CCube DVXChip-based PCI products
          0 = /dev/dvxirq0  First DVX device
          1 = /dev/dvxirq1  Second DVX device
            ...

180 char    USB devices
          0 = /dev/usb/lp0  First USB printer
            ...
         15 = /dev/usb/lp15 16th USB printer
         16 = /dev/usb/mouse0   First USB mouse
            ...
         31 = /dev/usb/mouse15  16th USB mouse
         32 = /dev/usb/ez0  First USB firmware loader
            ...
         47 = /dev/usb/ez15 16th USB firmware loader
         48 = /dev/usb/scanner0 First USB scanner
            ...
         63 = /dev/usb/scanner15 16th USB scanner
         64 = /dev/usb/rio500   Diamond Rio 500
         65 = /dev/usb/usblcd   USBLCD Interface ([email protected])
         66 = /dev/usb/cpad0    Synaptics cPad (mouse/LCD)

180 block   USB block devices
        0 = /dev/uba        First USB block device
        8 = /dev/ubb        Second USB block device
        16 = /dev/ubc       Thrid USB block device
        ...

181 char    Conrad Electronic parallel port radio clocks
          0 = /dev/pcfclock0    First Conrad radio clock
          1 = /dev/pcfclock1    Second Conrad radio clock
            ...

182 char    Picture Elements THR2 binarizer
          0 = /dev/pethr0   First THR2 board
          1 = /dev/pethr1   Second THR2 board
            ...

183 char    SST 5136-DN DeviceNet interface
          0 = /dev/ss5136dn0    First DeviceNet interface
          1 = /dev/ss5136dn1    Second DeviceNet interface
            ...

        This device used to be assigned to major number 144.
        It had to be moved due to an unfortunate conflict.

184 char    Picture Elements' video simulator/sender
          0 = /dev/pevss0   First sender board
          1 = /dev/pevss1   Second sender board
            ...

185 char    InterMezzo high availability file system
          0 = /dev/intermezzo0  First cache manager
          1 = /dev/intermezzo1  Second cache manager
            ...

        See http://www.inter-mezzo.org/ for more information.

186 char    Object-based storage control device
          0 = /dev/obd0     First obd control device
          1 = /dev/obd1     Second obd control device
            ...

        See ftp://ftp.lustre.org/pub/obd for code and information.

187 char    DESkey hardware encryption device
          0 = /dev/deskey0  First DES key
          1 = /dev/deskey1  Second DES key
            ...

188 char    USB serial converters
          0 = /dev/ttyUSB0  First USB serial converter
          1 = /dev/ttyUSB1  Second USB serial converter
            ...

189 char    USB serial converters - alternate devices
          0 = /dev/cuusb0   Callout device for ttyUSB0
          1 = /dev/cuusb1   Callout device for ttyUSB1
            ...

190 char    Kansas City tracker/tuner card
          0 = /dev/kctt0    First KCT/T card
          1 = /dev/kctt1    Second KCT/T card
            ...

191 char    Reserved for PCMCIA

192 char    Kernel profiling interface
          0 = /dev/profile  Profiling control device
          1 = /dev/profile0 Profiling device for CPU 0
          2 = /dev/profile1 Profiling device for CPU 1
            ...

193 char    Kernel event-tracing interface
          0 = /dev/trace    Tracing control device
          1 = /dev/trace0   Tracing device for CPU 0
          2 = /dev/trace1   Tracing device for CPU 1
            ...

194 char    linVideoStreams (LINVS)
          0 = /dev/mvideo/status0   Video compression status
          1 = /dev/mvideo/stream0   Video stream
          2 = /dev/mvideo/frame0    Single compressed frame
          3 = /dev/mvideo/rawframe0 Raw uncompressed frame
          4 = /dev/mvideo/codec0    Direct codec access
          5 = /dev/mvideo/video4linux0  Video4Linux compatibility

         16 = /dev/mvideo/status1   Second device
            ...
         32 = /dev/mvideo/status2   Third device
            ...
            ...
        240 = /dev/mvideo/status15  16th device 
            ...

195 char    Nvidia graphics devices
          0 = /dev/nvidia0      First Nvidia card
          1 = /dev/nvidia1      Second Nvidia card
            ...
        255 = /dev/nvidiactl        Nvidia card control device

196 char    Tormenta T1 card
          0 = /dev/tor/0        Master control channel for all cards
          1 = /dev/tor/1        First DS0
          2 = /dev/tor/2        Second DS0
            ...
         48 = /dev/tor/48       48th DS0
         49 = /dev/tor/49       First pseudo-channel
         50 = /dev/tor/50       Second pseudo-channel
            ...

197 char    OpenTNF tracing facility
          0 = /dev/tnf/t0       Trace 0 data extraction
          1 = /dev/tnf/t1       Trace 1 data extraction
            ...
        128 = /dev/tnf/status       Tracing facility status
        130 = /dev/tnf/trace        Tracing device

198 char    Total Impact TPMP2 quad coprocessor PCI card
          0 = /dev/tpmp2/0      First card
          1 = /dev/tpmp2/1      Second card
            ...

199 char    Veritas volume manager (VxVM) volumes
          0 = /dev/vx/rdsk/*/*      First volume
          1 = /dev/vx/rdsk/*/*      Second volume
            ...

199 block   Veritas volume manager (VxVM) volumes
          0 = /dev/vx/dsk/*/*       First volume
          1 = /dev/vx/dsk/*/*       Second volume
            ...

        The namespace in these directories is maintained by
        the user space VxVM software.

200 char    Veritas VxVM configuration interface
                  0 = /dev/vx/config        Configuration access node
                  1 = /dev/vx/trace     Volume i/o trace access node
                  2 = /dev/vx/iod       Volume i/o daemon access node
                  3 = /dev/vx/info      Volume information access node
                  4 = /dev/vx/task      Volume tasks access node
                  5 = /dev/vx/taskmon       Volume tasks monitor daemon

201 char    Veritas VxVM dynamic multipathing driver
          0 = /dev/vx/rdmp/*        First multipath device
          1 = /dev/vx/rdmp/*        Second multipath device
            ...
201 block   Veritas VxVM dynamic multipathing driver
          0 = /dev/vx/dmp/*     First multipath device
          1 = /dev/vx/dmp/*     Second multipath device
            ...

        The namespace in these directories is maintained by
        the user space VxVM software.

202 char    CPU model-specific registers
          0 = /dev/cpu/0/msr        MSRs on CPU 0
          1 = /dev/cpu/1/msr        MSRs on CPU 1
            ...

203 char    CPU CPUID information
          0 = /dev/cpu/0/cpuid      CPUID on CPU 0
          1 = /dev/cpu/1/cpuid      CPUID on CPU 1
            ...

204 char    Low-density serial ports
          0 = /dev/ttyLU0       LinkUp Systems L72xx UART - port 0
          1 = /dev/ttyLU1       LinkUp Systems L72xx UART - port 1
          2 = /dev/ttyLU2       LinkUp Systems L72xx UART - port 2
          3 = /dev/ttyLU3       LinkUp Systems L72xx UART - port 3
          4 = /dev/ttyFB0       Intel Footbridge (ARM)
          5 = /dev/ttySA0       StrongARM builtin serial port 0
          6 = /dev/ttySA1       StrongARM builtin serial port 1
          7 = /dev/ttySA2       StrongARM builtin serial port 2
          8 = /dev/ttySC0       SCI serial port (SuperH) - port 0
          9 = /dev/ttySC1       SCI serial port (SuperH) - port 1
         10 = /dev/ttySC2       SCI serial port (SuperH) - port 2
         11 = /dev/ttySC3       SCI serial port (SuperH) - port 3
         12 = /dev/ttyFW0       Firmware console - port 0
         13 = /dev/ttyFW1       Firmware console - port 1
         14 = /dev/ttyFW2       Firmware console - port 2
         15 = /dev/ttyFW3       Firmware console - port 3
         16 = /dev/ttyAM0       ARM "AMBA" serial port 0
            ...
         31 = /dev/ttyAM15      ARM "AMBA" serial port 15
         32 = /dev/ttyDB0       DataBooster serial port 0
            ...
         39 = /dev/ttyDB7       DataBooster serial port 7
         40 = /dev/ttySG0       SGI Altix console port
         41 = /dev/ttySMX0      Motorola i.MX - port 0
         42 = /dev/ttySMX1      Motorola i.MX - port 1
         43 = /dev/ttySMX2      Motorola i.MX - port 2
         44 = /dev/ttyMM0       Marvell MPSC - port 0
         45 = /dev/ttyMM1       Marvell MPSC - port 1   
         46 = /dev/ttyCPM0      PPC CPM (SCC or SMC) - port 0
            ...
         47 = /dev/ttyCPM5      PPC CPM (SCC or SMC) - port 5
         50 = /dev/ttyIOC40     Altix serial card
            ...
         81 = /dev/ttyIOC431        Altix serial card

205 char    Low-density serial ports (alternate device)
          0 = /dev/culu0        Callout device for ttyLU0
          1 = /dev/culu1        Callout device for ttyLU1
          2 = /dev/culu2        Callout device for ttyLU2
          3 = /dev/culu3        Callout device for ttyLU3
          4 = /dev/cufb0        Callout device for ttyFB0
          5 = /dev/cusa0        Callout device for ttySA0
          6 = /dev/cusa1        Callout device for ttySA1
          7 = /dev/cusa2        Callout device for ttySA2
          8 = /dev/cusc0        Callout device for ttySC0
          9 = /dev/cusc1        Callout device for ttySC1
         10 = /dev/cusc2        Callout device for ttySC2
         11 = /dev/cusc3        Callout device for ttySC3
         12 = /dev/cufw0        Callout device for ttyFW0
         13 = /dev/cufw1        Callout device for ttyFW1
         14 = /dev/cufw2        Callout device for ttyFW2
         15 = /dev/cufw3        Callout device for ttyFW3
         16 = /dev/cuam0        Callout device for ttyAM0
            ...
         31 = /dev/cuam15       Callout device for ttyAM15
         32 = /dev/cudb0        Callout device for ttyDB0
            ...
         39 = /dev/cudb7        Callout device for ttyDB7
         40 = /dev/cusg0        Callout device for ttySG0
         41 = /dev/ttycusmx0        Callout device for ttySMX0
         42 = /dev/ttycusmx1        Callout device for ttySMX1
         43 = /dev/ttycusmx2        Callout device for ttySMX2
         46 = /dev/cucpm0       Callout device for ttyCPM0
            ...
         49 = /dev/cucpm5       Callout device for ttyCPM5
         50 = /dev/cuioc40      Callout device for ttyIOC40
            ...
         81 = /dev/cuioc431     Callout device for ttyIOC431


206 char    OnStream SC-x0 tape devices
          0 = /dev/osst0        First OnStream SCSI tape, mode 0
          1 = /dev/osst1        Second OnStream SCSI tape, mode 0
            ...
         32 = /dev/osst0l       First OnStream SCSI tape, mode 1
         33 = /dev/osst1l       Second OnStream SCSI tape, mode 1
            ...
         64 = /dev/osst0m       First OnStream SCSI tape, mode 2
         65 = /dev/osst1m       Second OnStream SCSI tape, mode 2
            ...
         96 = /dev/osst0a       First OnStream SCSI tape, mode 3
         97 = /dev/osst1a       Second OnStream SCSI tape, mode 3
            ...
        128 = /dev/nosst0       No rewind version of /dev/osst0
        129 = /dev/nosst1       No rewind version of /dev/osst1
            ...
        160 = /dev/nosst0l      No rewind version of /dev/osst0l
        161 = /dev/nosst1l      No rewind version of /dev/osst1l
            ...
        192 = /dev/nosst0m      No rewind version of /dev/osst0m
        193 = /dev/nosst1m      No rewind version of /dev/osst1m
            ...
        224 = /dev/nosst0a      No rewind version of /dev/osst0a
        225 = /dev/nosst1a      No rewind version of /dev/osst1a
            ...

        The OnStream SC-x0 SCSI tapes do not support the
        standard SCSI SASD command set and therefore need
        their own driver "osst". Note that the IDE, USB (and
        maybe ParPort) versions may be driven via ide-scsi or
        usb-storage SCSI emulation and this osst device and
        driver as well.  The ADR-x0 drives are QIC-157
        compliant and don't need osst.

207 char    Compaq ProLiant health feature indicate
          0 = /dev/cpqhealth/cpqw   Redirector interface
          1 = /dev/cpqhealth/crom   EISA CROM
          2 = /dev/cpqhealth/cdt    Data Table
          3 = /dev/cpqhealth/cevt   Event Log
          4 = /dev/cpqhealth/casr   Automatic Server Recovery
          5 = /dev/cpqhealth/cecc   ECC Memory
          6 = /dev/cpqhealth/cmca   Machine Check Architecture
          7 = /dev/cpqhealth/ccsm   Deprecated CDT
          8 = /dev/cpqhealth/cnmi   NMI Handling
          9 = /dev/cpqhealth/css    Sideshow Management
         10 = /dev/cpqhealth/cram   CMOS interface
         11 = /dev/cpqhealth/cpci   PCI IRQ interface

208 char    User space serial ports
          0 = /dev/ttyU0        First user space serial port
          1 = /dev/ttyU1        Second user space serial port
            ...

209 char    User space serial ports (alternate devices)
          0 = /dev/cuu0         Callout device for ttyU0
          1 = /dev/cuu1         Callout device for ttyU1
            ...

210 char    SBE, Inc. sync/async serial card
          0 = /dev/sbei/wxcfg0      Configuration device for board 0
          1 = /dev/sbei/dld0        Download device for board 0
          2 = /dev/sbei/wan00       WAN device, port 0, board 0
          3 = /dev/sbei/wan01       WAN device, port 1, board 0
          4 = /dev/sbei/wan02       WAN device, port 2, board 0
          5 = /dev/sbei/wan03       WAN device, port 3, board 0
          6 = /dev/sbei/wanc00      WAN clone device, port 0, board 0
          7 = /dev/sbei/wanc01      WAN clone device, port 1, board 0
          8 = /dev/sbei/wanc02      WAN clone device, port 2, board 0
          9 = /dev/sbei/wanc03      WAN clone device, port 3, board 0
         10 = /dev/sbei/wxcfg1      Configuration device for board 1
         11 = /dev/sbei/dld1        Download device for board 1
         12 = /dev/sbei/wan10       WAN device, port 0, board 1
         13 = /dev/sbei/wan11       WAN device, port 1, board 1
         14 = /dev/sbei/wan12       WAN device, port 2, board 1
         15 = /dev/sbei/wan13       WAN device, port 3, board 1
         16 = /dev/sbei/wanc10      WAN clone device, port 0, board 1
         17 = /dev/sbei/wanc11      WAN clone device, port 1, board 1
         18 = /dev/sbei/wanc12      WAN clone device, port 2, board 1
         19 = /dev/sbei/wanc13      WAN clone device, port 3, board 1
            ...

        Yes, each board is really spaced 10 (decimal) apart.

211 char    Addinum CPCI1500 digital I/O card
          0 = /dev/addinum/cpci1500/0   First CPCI1500 card
          1 = /dev/addinum/cpci1500/1   Second CPCI1500 card
            ...

212 char    LinuxTV.org DVB driver subsystem

          0 = /dev/dvb/adapter0/video0    first video decoder of first card
          1 = /dev/dvb/adapter0/audio0    first audio decoder of first card
          2 = /dev/dvb/adapter0/sec0      (obsolete/unused)
          3 = /dev/dvb/adapter0/frontend0 first frontend device of first card
          4 = /dev/dvb/adapter0/demux0    first demux device of first card
          5 = /dev/dvb/adapter0/dvr0      first digital video recoder device of first card
          6 = /dev/dvb/adapter0/ca0       first common access port of first card
          7 = /dev/dvb/adapter0/net0      first network device of first card
          8 = /dev/dvb/adapter0/osd0      first on-screen-display device of first card
          9 = /dev/dvb/adapter0/video1    second video decoder of first card
            ...
         64 = /dev/dvb/adapter1/video0    first video decoder of second card
            ...
        128 = /dev/dvb/adapter2/video0    first video decoder of third card
            ...
        196 = /dev/dvb/adapter3/video0    first video decoder of fourth card


216 char    USB BlueTooth devices
          0 = /dev/ttyUB0       First USB BlueTooth device
          1 = /dev/ttyUB1       Second USB BlueTooth device
            ...

217 char    USB BlueTooth devices (alternate devices)
          0 = /dev/cuub0        Callout device for ttyUB0
          1 = /dev/cuub1        Callout device for ttyUB1
            ...

218 char    The Logical Company bus Unibus/Qbus adapters
          0 = /dev/logicalco/bci/0  First bus adapter
          1 = /dev/logicalco/bci/1  First bus adapter
            ...

219 char    The Logical Company DCI-1300 digital I/O card
          0 = /dev/logicalco/dci1300/0  First DCI-1300 card
          1 = /dev/logicalco/dci1300/1  Second DCI-1300 card
            ...

220 char    Myricom Myrinet "GM" board
          0 = /dev/myricom/gm0      First Myrinet GM board
          1 = /dev/myricom/gmp0     First board "root access"
          2 = /dev/myricom/gm1      Second Myrinet GM board
          3 = /dev/myricom/gmp1     Second board "root access"
            ...

221 char    VME bus
          0 = /dev/bus/vme/m0       First master image
          1 = /dev/bus/vme/m1       Second master image
          2 = /dev/bus/vme/m2       Third master image
          3 = /dev/bus/vme/m3       Fourth master image
          4 = /dev/bus/vme/s0       First slave image
          5 = /dev/bus/vme/s1       Second slave image
          6 = /dev/bus/vme/s2       Third slave image
          7 = /dev/bus/vme/s3       Fourth slave image
          8 = /dev/bus/vme/ctl      Control

        It is expected that all VME bus drivers will use the
        same interface.  For interface documentation see
        http://www.vmelinux.org/.

224 char    A2232 serial card
          0 = /dev/ttyY0        First A2232 port
          1 = /dev/ttyY1        Second A2232 port
            ...

225 char    A2232 serial card (alternate devices)
          0 = /dev/cuy0         Callout device for ttyY0
          1 = /dev/cuy1         Callout device for ttyY1
            ...

226 char    Direct Rendering Infrastructure (DRI)
          0 = /dev/dri/card0        First graphics card
          1 = /dev/dri/card1        Second graphics card
            ...

227 char    IBM 3270 terminal Unix tty access
          1 = /dev/3270/tty1        First 3270 terminal
          2 = /dev/3270/tty2        Seconds 3270 terminal
            ...

228 char    IBM 3270 terminal block-mode access
          0 = /dev/3270/tub     Controlling interface
          1 = /dev/3270/tub1        First 3270 terminal
          2 = /dev/3270/tub2        Second 3270 terminal
            ...

229 char    IBM iSeries virtual console
          0 = /dev/iseries/vtty0    First console port
          1 = /dev/iseries/vtty1    Second console port
            ...

230 char    IBM iSeries virtual tape
          0 = /dev/iseries/vt0      First virtual tape, mode 0
          1 = /dev/iseries/vt1      Second virtual tape, mode 0
            ...
         32 = /dev/iseries/vt0l     First virtual tape, mode 1
         33 = /dev/iseries/vt1l     Second virtual tape, mode 1
            ...
         64 = /dev/iseries/vt0m     First virtual tape, mode 2
         65 = /dev/iseries/vt1m     Second virtual tape, mode 2
            ...
         96 = /dev/iseries/vt0a     First virtual tape, mode 3
         97 = /dev/iseries/vt1a     Second virtual tape, mode 3
              ...
        128 = /dev/iseries/nvt0     First virtual tape, mode 0, no rewind
        129 = /dev/iseries/nvt1     Second virtual tape, mode 0, no rewind
            ...
        160 = /dev/iseries/nvt0l    First virtual tape, mode 1, no rewind
        161 = /dev/iseries/nvt1l    Second virtual tape, mode 1, no rewind
            ...
        192 = /dev/iseries/nvt0m    First virtual tape, mode 2, no rewind
        193 = /dev/iseries/nvt1m    Second virtual tape, mode 2, no rewind
            ...
        224 = /dev/iseries/nvt0a    First virtual tape, mode 3, no rewind
        225 = /dev/iseries/nvt1a    Second virtual tape, mode 3, no rewind
            ...

        "No rewind" refers to the omission of the default
        automatic rewind on device close.  The MTREW or MTOFFL
        ioctl()'s can be used to rewind the tape regardless of
        the device used to access it.

231 char    InfiniBand MAD
        0 = /dev/infiniband/umad0
        1 = /dev/infiniband/umad1
         ...

232-239     UNASSIGNED

240-254 char    LOCAL/EXPERIMENTAL USE
240-254 block   LOCAL/EXPERIMENTAL USE
        Allocated for local/experimental use.  For devices not
        assigned official numbers, these ranges should be
        used in order to avoid conflicting with future assignments.

255 char    RESERVED
255 block   RESERVED

        This major is reserved to assist the expansion to a
        larger number space.  No device nodes with this major
        should ever be created on the filesystem.

 ****   ADDITIONAL /dev DIRECTORY ENTRIES

This section details additional entries that should or may exist in
the /dev directory.  It is preferred that symbolic links use the same
form (absolute or relative) as is indicated here.  Links are
classified as "hard" or "symbolic" depending on the preferred type of
link; if possible, the indicated type of link should be used.


    Compulsory links

These links should exist on all systems:

/dev/fd     /proc/self/fd   symbolic    File descriptors
/dev/stdin  fd/0        symbolic    stdin file descriptor
/dev/stdout fd/1        symbolic    stdout file descriptor
/dev/stderr fd/2        symbolic    stderr file descriptor
/dev/nfsd   socksys     symbolic    Required by iBCS-2
/dev/X0R    null        symbolic    Required by iBCS-2

Note: /dev/X0R is --.

    Recommended links

It is recommended that these links exist on all systems:

/dev/core   /proc/kcore symbolic    Backward compatibility
/dev/ramdisk    ram0        symbolic    Backward compatibility
/dev/ftape  qft0        symbolic    Backward compatibility
/dev/bttv0  video0      symbolic    Backward compatibility
/dev/radio  radio0      symbolic    Backward compatibility
/dev/i2o*   /dev/i2o/*  symbolic    Backward compatibility
/dev/scd?   sr?     hard        Alternate SCSI CD-ROM name

    Locally defined links

The following links may be established locally to conform to the
configuration of the system.  This is merely a tabulation of existing
practice, and does not constitute a recommendation.  However, if they
exist, they should have the following uses.

/dev/mouse  mouse port  symbolic    Current mouse device
/dev/tape   tape device symbolic    Current tape device
/dev/cdrom  CD-ROM device   symbolic    Current CD-ROM device
/dev/cdwriter   CD-writer   symbolic    Current CD-writer device
/dev/scanner    scanner     symbolic    Current scanner device
/dev/modem  modem port  symbolic    Current dialout device
/dev/root   root device symbolic    Current root filesystem
/dev/swap   swap device symbolic    Current swap device

/dev/modem should not be used for a modem which supports dialin as
well as dialout, as it tends to cause lock file problems.  If it
exists, /dev/modem should point to the appropriate primary TTY device
(the use of the alternate callout devices is deprecated).

For SCSI devices, /dev/tape and /dev/cdrom should point to the
``cooked'' devices (/dev/st* and /dev/sr*, respectively), whereas
/dev/cdwriter and /dev/scanner should point to the appropriate generic
SCSI devices (/dev/sg*).

/dev/mouse may point to a primary serial TTY device, a hardware mouse
device, or a socket for a mouse driver program (e.g. /dev/gpmdata).

    Sockets and pipes

Non-transient sockets and named pipes may exist in /dev.  Common entries are:

/dev/printer    socket      lpd local socket
/dev/log    socket      syslog local socket
/dev/gpmdata    socket      gpm mouse multiplexer

    Mount points

The following names are reserved for mounting special filesystems
under /dev.  These special filesystems provide kernel interfaces that
cannot be provided with standard device nodes.

/dev/pts    devpts      PTY slave filesystem
/dev/shm    tmpfs       POSIX shared memory maintenance access

 ****   TERMINAL DEVICES

Terminal, or TTY devices are a special class of character devices.  A
terminal device is any device that could act as a controlling terminal
for a session; this includes virtual consoles, serial ports, and
pseudoterminals (PTYs).

All terminal devices share a common set of capabilities known as line
diciplines; these include the common terminal line dicipline as well
as SLIP and PPP modes.

All terminal devices are named similarly; this section explains the
naming and use of the various types of TTYs.  Note that the naming
conventions include several historical warts; some of these are
Linux-specific, some were inherited from other systems, and some
reflect Linux outgrowing a borrowed convention.

A hash mark (#) in a device name is used here to indicate a decimal
number without leading zeroes.

    Virtual consoles and the console device

Virtual consoles are full-screen terminal displays on the system video
monitor.  Virtual consoles are named /dev/tty#, with numbering
starting at /dev/tty1; /dev/tty0 is the current virtual console.
/dev/tty0 is the device that should be used to access the system video
card on those architectures for which the frame buffer devices
(/dev/fb*) are not applicable.  Do not use /dev/console
for this purpose.

The console device, /dev/console, is the device to which system
messages should be sent, and on which logins should be permitted in
single-user mode.  Starting with Linux 2.1.71, /dev/console is managed
by the kernel; for previous versions it should be a symbolic link to
either /dev/tty0, a specific virtual console such as /dev/tty1, or to
a serial port primary (tty*, not cu*) device, depending on the
configuration of the system.

    Serial ports

Serial ports are RS-232 serial ports and any device which simulates
one, either in hardware (such as internal modems) or in software (such
as the ISDN driver.)  Under Linux, each serial ports has two device
names, the primary or callin device and the alternate or callout one.
Each kind of device is indicated by a different letter.  For any
letter X, the names of the devices are /dev/ttyX# and /dev/cux#,
respectively; for historical reasons, /dev/ttyS# and /dev/ttyC#
correspond to /dev/cua# and /dev/cub#.  In the future, it should be
expected that multiple letters will be used; all letters will be upper
case for the "tty" device (e.g. /dev/ttyDP#) and lower case for the
"cu" device (e.g. /dev/cudp#).

The names /dev/ttyQ# and /dev/cuq# are reserved for local use.

The alternate devices provide for kernel-based exclusion and somewhat
different defaults than the primary devices.  Their main purpose is to
allow the use of serial ports with programs with no inherent or broken
support for serial ports.  Their use is deprecated, and they may be
removed from a future version of Linux.

Arbitration of serial ports is provided by the use of lock files with
the names /var/lock/LCK..ttyX#.  The contents of the lock file should
be the PID of the locking process as an ASCII number.

It is common practice to install links such as /dev/modem
which point to serial ports.  In order to ensure proper locking in the
presence of these links, it is recommended that software chase
symlinks and lock all possible names; additionally, it is recommended
that a lock file be installed with the corresponding alternate
device.  In order to avoid deadlocks, it is recommended that the locks
are acquired in the following order, and released in the reverse:

    1. The symbolic link name, if any (/var/lock/LCK..modem)
    2. The "tty" name (/var/lock/LCK..ttyS2)
    3. The alternate device name (/var/lock/LCK..cua2)

In the case of nested symbolic links, the lock files should be
installed in the order the symlinks are resolved.

Under no circumstances should an application hold a lock while waiting
for another to be released.  In addition, applications which attempt
to create lock files for the corresponding alternate device names
should take into account the possibility of being used on a non-serial
port TTY, for which no alternate device would exist.

    Pseudoterminals (PTYs)

Pseudoterminals, or PTYs, are used to create login sessions or provide
other capabilities requiring a TTY line dicipline (including SLIP or
PPP capability) to arbitrary data-generation processes.  Each PTY has
a master side, named /dev/pty[p-za-e][0-9a-f], and a slave side, named
/dev/tty[p-za-e][0-9a-f].  The kernel arbitrates the use of PTYs by
allowing each master side to be opened only once.

Once the master side has been opened, the corresponding slave device
can be used in the same manner as any TTY device.  The master and
slave devices are connected by the kernel, generating the equivalent
of a bidirectional pipe with TTY capabilities.

Recent versions of the Linux kernels and GNU libc contain support for
the System V/Unix98 naming scheme for PTYs, which assigns a common
device, /dev/ptmx, to all the masters (opening it will automatically
give you a previously unassigned PTY) and a subdirectory, /dev/pts,
for the slaves; the slaves are named with decimal integers (/dev/pts/#
in our notation).  This removes the problem of exhausting the
namespace and enables the kernel to automatically create the device
nodes for the slaves on demand using the "devpts" filesystem.


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