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		    LINUX ALLOCATED DEVICES (2.6+ version)

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	     Maintained by Alan Cox <device@lanana.org>
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		      Last revised: 6th April 2009
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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The LaTeX version of this document is no longer maintained.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The symbol {2.6} means the allocation is obsolete and scheduled for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... <device@lanana.org>.  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.

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Fourth, remember that Linux now has extensive support for dynamic allocation
of device numbering and can use sysfs and udev to handle the naming needs.
There are still some exceptions in the serial and boot device area. Before
asking for a device number make sure you actually need one.

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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.
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		 10 = /dev/aio		Asynchronous I/O notification interface
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		 11 = /dev/kmsg		Writes to this come out as printk's
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		 12 = /dev/oldmem	Used by crashdump kernels to access
					the memory of the kernel that crashed.
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  1 block	RAM disk
		  0 = /dev/ram0		First RAM disk
		  1 = /dev/ram1		Second RAM disk
		    ...
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		250 = /dev/initrd	Initial RAM disk
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		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.
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  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
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		NOTE: These devices permit both read and write access.

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

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		The loop devices are used to mount filesystems not
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		associated with block devices.	The binding to the
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		loop devices is handled by mount(8) or losetup(8).
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  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
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		129 =
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		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
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		142 =
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		143 = /dev/pciconf	PCI configuration space
		144 = /dev/nvram	Non-volatile configuration RAM
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		145 = /dev/hfmodem	Soundcard shortwave modem control
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		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	<information missing>
		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
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		210 = /dev/impi/bt	IMPI coprocessor block transfer
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		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
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		231 = /dev/snapshot	System memory snapshot device
		232 = /dev/kvm		Kernel-based virtual machine (hardware virtualization extensions)
		233 = /dev/kmview	View-OS A process with a view
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		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.

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 12 block
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 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
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		  6 =
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		  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
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 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
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 16 block	GoldStar CD-ROM
		  0 = /dev/gscd		GoldStar CD-ROM

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 17 char	OBSOLETE (was Chase serial card)
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		  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

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 18 char	OBSOLETE (was Chase serial card - alternate devices)
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		  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
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 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
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 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
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		(see major number 3).
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 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)
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		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

645
 26 char
646

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 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
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 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
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 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
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 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
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 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)
813

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		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
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 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
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 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.

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 38 block	OBSOLETE (was Linux/AP+)
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 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
		      ...
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 41 char	Yet Another Micro Monitor
		  0 = /dev/yamm		Yet Another Micro Monitor
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 42 char	Demo/sample use
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 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
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 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
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 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
		    ...
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		240 = /dev/ftlp		FTL on 16th Memory Technology Device
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		Partitions are handled in the same way as for IDE
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		disks (see major number 3) except that the partition
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		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
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 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