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Linux-0.98/docs/device-list
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Article 16709 of comp.os.linux:
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Path: samba!concert!gatech!swrinde!sdd.hp.com!cs.utexas.edu!uwm.edu!uwm.edu!usenet
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From: rick@ee.uwm.edu (Rick Miller, Linux Device Registrar)
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Newsgroups: comp.os.linux
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Subject: First Release of the Linux Device List
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Date: 17 Nov 1992 16:00:20 GMT
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Organization: Just me.
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Lines: 131
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Message-ID: <1eb4ukINN53j@uwm.edu>
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NNTP-Posting-Host: 129.89.2.33
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Summary: LOOK IT OVER! COMMENTS PLEASE!
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Keywords: TAPE, CD-ROM, HELP!
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The following is what I have so far in the way of a complete listing of
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devices for Linux. There are some gaps that need filling...
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For example, I don't have any minor numbers for TAPE drives yet, SCSI or
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otherwise. Same goes for CD-ROMs. Will those who have such things running
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let me know what major and minor numbers they've been using? Thanks.
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---------------------------------------------------------------------------
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The Linux Device List
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maintained by rick@ee.uwm.edu (Rick Miller, Linux Device Registrar)
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Many thanks to richard@stat.tamu.edu and Jim Winstead Jr.
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Majors:
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0. Unnamed . (unknown) .... for proc-fs, NFS clients, etc.
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1. Memory .. (character) .. ram, mem, kmem, null, port, zero
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2. Floppy .. (block) ...... fd[01][dhDH]{360,720,1200,1440} or fd[01]
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3. Hard Disk (block) ...... hd[ab] or hd[ab][1-?] (Extended>4)
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4. Tty ..... (character) .. tty{0,1-8,63,64-127,128-?} or ttys{0-3,1-4}
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5. tty ..... (character) .. special tty: owner of its calling process.
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6. Lp ...... (character) .. lp[0-2] or par[0-2]
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7. Tape .... (block) ...... t[0-?] (reserved for Non-SCSI tape drives)
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8. Scsi Disk (block) ...... sd[0-?] or sd[0-?][0-?]
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9. Scsi Tape (block) ...... st[0-?]
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10. Bus Mouse (character) .. bm, psaux (mouse)
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11. CD-ROM .. (block) ...... scd
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Breakdown of minors by Majors:
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------------------------------
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0. Unnamed . (unknown) .... for proc-fs, NFS clients, etc.
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Minors?
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1. Memory .. (character) .. ram, mem, kmem, null, port, zero
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0. /dev/ram
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1. (block): RAM-Disk (character): /dev/mem
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2. /dev/kmem
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3. /dev/null
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4. /dev/port
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5. /dev/zero
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2. Floppy .. (block) ...... fd[01][dhDH]{360,720,1200,1440} or fd[01]
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Minors are [drive + [4 * type]] where drive 0-3 == A:-D: (floppy)
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and type is: 0: Autodetect 4: 720k in 3.5"
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1: 360k in 5.25" 1.2M 5: 360k in 5.25" 1.2M
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2: 1.2M in 5.25" 1.2M 6. 720k in 5.25" 1.2M
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3: 360k in 3.5" 7. 1.44M in 3.5" 1.44
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3. Hard Disk (block) ...... hd[ab] or hd[ab][1-?] (Extended>4)
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0. First HD (/dev/hda), whole drive including Master Boot Record.
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1-4. Partitions on the first HD.
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5-8. Logical partitions within an extended partition on first HD.
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64. Second HD (/dev/hdb), whole drive including Master Boot Record.
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65-68. Partitions on the second HD.
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69-72. Logical partitions within an extended partition on second HD.
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Notes: BE *VERY* CAREFUL WITH /dev/hda AND /dev/hdb!! These two
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devices signify the *entire* *drive*, not just one partition.
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The only things that use /dev/hda or /dev/hdb are things that
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need to read/change the partition table (like fdisk).
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Linux doesn't order anything. It perceives partitions in the
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order in which they appear in the partition table. Thus,
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/dev/hd?1 may follow /dev/hd?2 in the cylinder numbering.
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The names of the hard drives are not the same as under Minix.
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4. Tty ..... (character) .. tty{0,1-8,63,64-127,128-?} or ttys{0-3,1-4}
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0. /dev/tty0: This is the currently active Virtual Console.
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1-63. /dev/tty#: Specific virtual consoles.
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64-127. /dev/ttys*: Serial ports.
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128-191. /dev/pty[??]: PTY Masters.
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192-255. /dev/pty[??]: PTY Slaves.
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Notes: There are several constants set in the kernel sources which
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can be changed to compile a more customized kernel. They're
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found in [/usr/src]/linux/include/linux/tty.h:
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NR_CONSOLES The number of virtual consoles.
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NR_SERIALS The number of serial lines.
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NR_PTYS The number of pty's.
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5. tty ..... (character) .. special tty: owner of its calling process.
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0. /dev/tty: the tty that owns the process calling it.
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6. Lp ...... (character) .. lp[0-2] or par[0-2]
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1-3. Parallel (printer) ports. (Increasable in include/linux/lp.h)
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Notes: The number of line printers is defined by LP_NO which is
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found in [/usr/src]/linux/include/lp.h.
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Even if you only have one printer port, Linux may still call
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it /dev/lp1 (rather than /dev/lp0). Watch during boot-up to
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see how it recognizes your printer port.
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7. Tape .... (block) ...... t[0-?] (reserved for Non-SCSI tape drives)
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This one's just getting started. No minor numbers are yet assigned.
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It's not even in the source code.
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8. Scsi Disk (block) ...... sd[0-?] or sd[0-?][0-?]
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Minors numbers are [[16 * HostID] + partition]
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Notes: The maximum number of SCSI drives is defined by MAX_SD
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found in [/usr/src]/linux/kernel/blk_drv/scsi/sd.h.
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9. Scsi Tape (block) ...... st[0-?]
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Quoting from the source-code:
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void do_st_request(void)
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{
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panic("There is no st driver.\n\r");
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}
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Notes: For future reference, the maximum number of SCSI tapes
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is defined by MAX_ST which is found in
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[/usr/src]/linux/kernel/blk_drv/scsi/st.h.
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10. Bus Mouse (character) .. bm, psaux (mouse)
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(If I recall, X Windows requires that
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/dev/mouse be linked to one of these...)
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0. /dev/bm: (Logitec?) bus mouse
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1. /dev/psaux: PS/2 mouse port
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2. /dev/bm: MicroSoft bus mouse
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3. /dev/bm: ATI XL bus mouse
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11. CD-ROM .. (block) ...... scd
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Minors?
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---------------------------------------------------------------------------
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Rick Miller <rick@ee.uwm.edu> | <rick@discus.mil.wi.us> Ricxjo Muelisto
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Occupation: Husband, Father, WEPCo. WAN Mgr., Discus Sys0p, and Linux fan
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