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INSTALL_TINY revision 1.11.2.1
      1 #	$NetBSD: INSTALL_TINY,v 1.11.2.1 2000/11/20 20:09:16 bouyer Exp $
      2 #
      3 #	INSTALL_TINY - Tiny Installation kernel, suitable for 4M machines.
      4 #
      5 #	This kernel should be derived from INSTALL (which is derived
      6 #	from GENERIC) with some features commented out.
      7 #
      8 #	This kernel has been optimized for space. It is targeted towards
      9 #	small memory machines (4M). It has no SCSI, PCI or EISA. It does
     10 #	have pcmcia, for old laptops.
     11 #
     12 
     13 include "arch/i386/conf/std.i386"
     14 
     15 makeoptions 	COPTS="-Os"		# Optimise for space. Implies -O2
     16 
     17 # Enable the hooks used for initializing the root memory-disk.
     18 options 	MEMORY_DISK_HOOKS
     19 options 	MEMORY_DISK_IS_ROOT	# force root on memory disk
     20 options 	MEMORY_DISK_SERVER=0	# no userspace memory disk support
     21 options 	MINIROOTSIZE=2688	# size of memory disk, in blocks
     22 #options 	MINIROOTSIZE=2880	# 1.44M, same as a floppy
     23 
     24 maxusers	2		# estimated number of users
     25 
     26 # CPU support.  At least one is REQUIRED.
     27 options 	I386_CPU
     28 options 	I486_CPU
     29 #options 	I586_CPU
     30 #options 	I686_CPU
     31 
     32 # CPU-related options.
     33 options 	MATH_EMULATE	# floating point emulation
     34 #options 	VM86		# virtual 8086 emulation
     35 #options 	USER_LDT	# user-settable LDT; used by WINE
     36 # eliminate delay no-ops in I/O; recommended on all but very old machines
     37 #options 	DUMMY_NOPS
     38 
     39 # Misc. i386-specific options
     40 #options 	XSERVER		# X server support in console drivers
     41 
     42 # This option allows you to force a serial console at the specified
     43 # I/O address.
     44 #options 	"CONSDEVNAME=\"com\"",CONADDR=0x3f8,CONSPEED=9600
     45 
     46 # The following options override the memory sizes passed in from the boot
     47 # block.  Use them *only* if the boot block is unable to determine the correct
     48 # values.  Note that the BIOS may *correctly* report less than 640k of base
     49 # memory if the extended BIOS data area is located at the top of base memory
     50 # (as is the case on most recent systems).
     51 #options 	REALBASEMEM=...	# size of base memory
     52 #options 	REALEXTMEM=...	# size of extended memory
     53 
     54 #options 	UCONSOLE	# users can use TIOCCONS (for xconsole)
     55 options 	INSECURE	# disable kernel security levels
     56 
     57 options 	RTC_OFFSET=0	# hardware clock is this many mins. west of GMT
     58 #options 	NTP		# NTP phase/frequency locked loop
     59 
     60 #options 	KTRACE		# system call tracing via ktrace(1)
     61 
     62 #options 	SYSVSEM		# System V-like semaphores
     63 #options 	SYSVSHM		# System V-like memory sharing
     64 #options 	SHMMAXPGS=1024	# 1024 pages is the default
     65 
     66 #options 	LKM		# loadable kernel modules
     67 
     68 # Diagnostic/debugging support options
     69 #options 	DIAGNOSTIC	# cheap kernel consistency checks
     70 #options 	DEBUG		# expensive debugging checks/support
     71 #options 	KMEMSTATS	# kernel memory statistics (vmstat -m)
     72 #options 	DDB		# in-kernel debugger
     73 #options 	DDB_HISTORY_SIZE=512	# enable history editing in DDB
     74 #options 	KGDB		# remote debugger
     75 #options 	"KGDB_DEVNAME=\"com\"",KGDBADDR=0x3f8,KGDBRATE=9600
     76 #makeoptions 	DEBUG="-g"	# compile full symbol table
     77 
     78 # Compatibility options
     79 #options 	COMPAT_NOMID	# compatibility with 386BSD, BSDI, NetBSD 0.8,
     80 #options 	COMPAT_09	# NetBSD 0.9,
     81 #options 	COMPAT_10	# NetBSD 1.0,
     82 #options 	COMPAT_11	# NetBSD 1.1,
     83 #options 	COMPAT_12	# NetBSD 1.2,
     84 #options 	COMPAT_13	# NetBSD 1.3,
     85 options 	COMPAT_14	# NetBSD 1.4,
     86 #options 	COMPAT_43	# and 4.3BSD
     87 options 	COMPAT_386BSD_MBRPART # recognize old partition ID
     88 
     89 #options 	COMPAT_SVR4	# binary compatibility with SVR4
     90 #options 	COMPAT_IBCS2	# binary compatibility with SCO and ISC
     91 #options 	COMPAT_LINUX	# binary compatibility with Linux
     92 #options 	COMPAT_FREEBSD	# binary compatibility with FreeBSD
     93 
     94 # File systems
     95 file-system 	FFS		# UFS
     96 #file-system 	EXT2FS		# second extended file system (linux)
     97 #file-system 	LFS		# log-structured file system
     98 #file-system 	MFS		# memory file system
     99 file-system 	NFS		# Network File System client
    100 file-system 	CD9660		# ISO 9660 + Rock Ridge file system
    101 file-system 	MSDOSFS		# MS-DOS file system
    102 #file-system 	FDESC		# /dev/fd
    103 file-system 	KERNFS		# /kern
    104 #file-system 	NULLFS		# loopback file system
    105 #file-system 	PORTAL		# portal filesystem (still experimental)
    106 #file-system 	PROCFS		# /proc
    107 #file-system 	UMAPFS		# NULLFS + uid and gid remapping
    108 #file-system 	UNION		# union file system
    109 
    110 # Filesystem options
    111 #options 	QUOTA		# UFS quotas
    112 #options 	NFSSERVER	# Network File System server
    113 options 	NFS_V2_ONLY	# Exclude NFS3 and NQNFS code to save space
    114 options 	VNODE_OP_NOINLINE # Save space by not inlining vnode op calls
    115 #options 	EXT2FS_SYSTEM_FLAGS # makes ext2fs file flags (append and
    116 				# immutable) behave as system flags.
    117 
    118 # Networking options
    119 #options 	GATEWAY		# packet forwarding
    120 options 	INET		# IP + ICMP + TCP + UDP
    121 #options 	MROUTING	# IP multicast routing
    122 #options 	NS		# XNS
    123 #options 	NSIP		# XNS tunneling over IP
    124 #options 	ISO,TPIP	# OSI
    125 #options 	EON		# OSI tunneling over IP
    126 #options 	CCITT,LLC,HDLC	# X.25
    127 #options 	NETATALK	# AppleTalk networking protocols
    128 #options 	PPP_BSDCOMP	# BSD-Compress compression support for PPP
    129 #options 	PPP_DEFLATE	# Deflate compression support for PPP
    130 #options 	PPP_FILTER	# Active filter support for PPP (requires bpf)
    131 #options 	PFIL_HOOKS	# pfil(9) packet filter hooks
    132 
    133 # Compatibility with 4.2BSD implementation of TCP/IP.  Not recommended.
    134 #options 	TCP_COMPAT_42
    135 
    136 # These options enable verbose messages for several subsystems.
    137 # Warning, these may compile large string tables into the kernel!
    138 #options 	EISAVERBOSE	# verbose EISA device autoconfig messages
    139 #options 	PCIVERBOSE	# verbose PCI device autoconfig messages
    140 #options 	PCI_CONFIG_DUMP	# verbosely dump PCI config space
    141 #options 	PCMCIAVERBOSE	# verbose PCMCIA configuration messages
    142 #options 	SCSIVERBOSE	# human readable SCSI error messages
    143 
    144 # Squeeze...
    145 options 	NVNODE=50
    146 options 	NBUF=20
    147 options 	BUFPAGES=20
    148 options 	NMBCLUSTERS=64
    149 
    150 # Kernel root file system and dump configuration.
    151 config		netbsd	root on ? type ?
    152 #config		netbsd	root on sd0a type ffs
    153 #config		netbsd	root on ? type nfs
    154 
    155 #
    156 # Device configuration
    157 #
    158 
    159 mainbus0 at root
    160 
    161 #apm0	at mainbus0			# Advanced power management
    162 
    163 
    164 # Basic Bus Support
    165 
    166 # PCI bus support
    167 #pci*	at mainbus? bus ?
    168 #pci*	at pchb? bus ?
    169 #pci*	at ppb? bus ?
    170 
    171 # PCI bridges
    172 #pchb*	at pci? dev ? function ?	# PCI-Host bridges
    173 #pceb*	at pci? dev ? function ?	# PCI-EISA bridges
    174 #pcib*	at pci? dev ? function ?	# PCI-ISA bridges
    175 #ppb*	at pci? dev ? function ?	# PCI-PCI bridges
    176 # XXX 'puc's aren't really bridges, but there's no better place for them here
    177 #puc*	at pci? dev ? function ?	# PCI "universal" comm. cards
    178 
    179 # As well as 5 and 7, avoid irq 4 and 3 because we do not probe com* here
    180 options 	PCIC_ISA_INTR_ALLOC_MASK=0xff47
    181 
    182 # PCMCIA bus support
    183 pcmcia* at pcic? controller ? socket ?
    184 #pcmcia* at tcic? controller ? socket ?
    185 
    186 # ISA PCMCIA controllers
    187 pcic0   at isa? port 0x3e0 iomem 0xd0000 iosiz 0x10000
    188 pcic1   at isa? port 0x3e2 iomem 0xe0000 iosiz 0x4000
    189 
    190 # EISA bus support
    191 #eisa*	at mainbus?
    192 #eisa*	at pceb?
    193 
    194 # ISA bus support
    195 isa*	at mainbus?
    196 #eisa*	at pceb?
    197 #isa*	at pcib?
    198 
    199 # ISA Plug-and-Play bus support
    200 #isapnp0	at isa?
    201 
    202 # Coprocessor Support
    203 
    204 # Math Coprocessor support
    205 npx0	at isa? port 0xf0 irq 13	# x86 math coprocessor
    206 
    207 
    208 # Console Devices
    209 
    210 # ISA console
    211 pc0	at isa? port 0x60 irq 1		# pccons generic PC console driver
    212 
    213 #pcppi0	at isa?
    214 #sysbeep0	at pcppi?
    215 
    216 
    217 # Serial Devices
    218 
    219 # PCI serial interfaces
    220 #com*	at puc? port ?			# 16x50s on "universal" comm boards
    221 #cy*	at pci? dev ? function ?	# Cyclades Cyclom-Y serial boards
    222 
    223 # ISA Plug-and-Play serial interfaces
    224 #com*	at isapnp?			# Modems and serial boards
    225 
    226 # PCMCIA serial interfaces
    227 #com*	at pcmcia? function ?		# Modems and serial cards
    228 
    229 # ISA serial interfaces
    230 #options 	COM_HAYESP		# adds Hayes ESP serial board support
    231 #com0	at isa? port 0x3f8 irq 4	# Standard PC serial ports
    232 #com1	at isa? port 0x2f8 irq 3
    233 #com2	at isa? port 0x3e8 irq 5
    234 #com3	at isa? port 0x2e8 irq 9
    235 #ast0	at isa? port 0x1a0 irq 5	# AST 4-port serial cards
    236 #com*	at ast? slave ?
    237 #boca0	at isa? port 0x100 irq 5	# BOCA 8-port serial cards
    238 #com*	at boca? slave ?
    239 #rtfps0	at isa? port 0x1230 irq 10	# RT 4-port serial cards
    240 #com*	at rtfps? slave ?
    241 #cy0	at isa? iomem 0xd4000 irq 12	# Cyclades serial cards
    242 
    243 
    244 # Parallel Printer Interfaces
    245 
    246 # PCI parallel printer interfaces
    247 #lpt*	at puc? port ?			# || ports on "universal" comm boards
    248 
    249 # ISA parallel printer interfaces
    250 #lpt0	at isa? port 0x378 irq 7	# standard PC parallel ports
    251 #lpt1	at isa? port 0x278
    252 #lpt2	at isa? port 0x3bc
    253 
    254 
    255 # SCSI Controllers and Devices
    256 
    257 # PCI SCSI controllers
    258 #ahc*	at pci? dev ? function ?	# Adaptec [23]94x, aic78x0 SCSI
    259 #bha*	at pci? dev ? function ?	# BusLogic 9xx SCSI
    260 #dpt*	at pci? dev ? function ?	# DPT SmartCache/SmartRAID
    261 #isp*	at pci? dev ? function ?	# Qlogic ISP [12]0x0 SCSI/FibreChannel
    262 #ncr*	at pci? dev ? function ?	# NCR 53c8xx SCSI
    263 
    264 # EISA SCSI controllers
    265 #ahb*	at eisa? slot ?			# Adaptec 174[02] SCSI
    266 #ahc*	at eisa? slot ?			# Adaptec 274x, aic7770 SCSI
    267 #bha*	at eisa? slot ?			# BusLogic 7xx SCSI
    268 #dpt*	at eisa? slot ?			# DPT SmartCache/SmartRAID
    269 #uha*	at eisa? slot ?			# UltraStor 24f SCSI
    270 
    271 # PCMCIA SCSI controllers
    272 #aic*	at pcmcia? function ?		# Adaptec APA-1460 SCSI
    273 
    274 # ISA Plug-and-Play SCSI controllers
    275 #aic*	at isapnp?			# Adaptec AHA-1520B
    276 
    277 # ISA SCSI controllers
    278 #aha0	at isa? port 0x330 irq ? drq ?	# Adaptec 154[02] SCSI
    279 #aha1	at isa? port 0x334 irq ? drq ?
    280 #ahc0	at isa? port ? irq ?		# Adaptec 284x SCSI
    281 #aic0	at isa? port 0x340 irq 11	# Adaptec 152[02] SCSI
    282 #bha0	at isa? port 0x330 irq ? drq ?	# BusLogic [457]4X SCSI
    283 #bha1	at isa? port 0x334 irq ? drq ?
    284 # The "nca" and "dpt" probes might give false hits or hang your machine.
    285 #dpt0	at isa? port 0x170 irq ? drq ?	# DPT SmartCache/SmartRAID
    286 #nca0	at isa? port 0x360 irq 15	# Port-mapped NCR 53C80 controller
    287 #nca1	at isa? iomem 0xd8000 irq 5	# Memory-mapped controller (T128, etc.)
    288 #sea0	at isa? iomem 0xc8000 irq 5	# Seagate/Future Domain SCSI
    289 #uha0	at isa? port 0x330 irq ? drq ?	# UltraStor [13]4f SCSI
    290 #uha1	at isa? port 0x340 irq ? drq ?
    291 #wds0	at isa? port 0x350 irq 15 drq 6	# WD7000 and TMC-7000 controllers
    292 #wds1	at isa? port 0x358 irq 11 drq 5
    293 
    294 # SCSI bus support
    295 #scsibus* at aha?
    296 #scsibus* at ahb?
    297 #scsibus* at ahc?
    298 #scsibus* at aic?
    299 #scsibus* at bha?
    300 #scsibus* at dpt?
    301 #scsibus* at isp?
    302 #scsibus* at nca?
    303 #scsibus* at ncr?
    304 #scsibus* at sea?
    305 #scsibus* at uha?
    306 #scsibus* at wds?
    307 
    308 # SCSI devices
    309 #sd*	at scsibus? target ? lun ?	# SCSI disk drives
    310 #st*	at scsibus? target ? lun ?	# SCSI tape drives
    311 #cd*	at scsibus? target ? lun ?	# SCSI CD-ROM drives
    312 #ch*	at scsibus? target ? lun ?	# SCSI autochangers
    313 #ss*	at scsibus? target ? lun ?	# SCSI scanners
    314 #uk*	at scsibus? target ? lun ?	# SCSI unknown
    315 
    316 
    317 # RAID controllers and devices
    318 #cac*	at eisa?			# Compaq EISA array controllers
    319 #cac*	at pci? dev ? function ?	# Compaq PCI array controllers
    320 #ca*	at cac? unit ?			# Compaq array disk devices
    321 
    322 
    323 # IDE and related devices
    324 
    325 # PCMCIA IDE controllers
    326 wdc* 	at pcmcia? function ?
    327 
    328 # ST506, ESDI, and ISA IDE controllers
    329 # Use flags 0x01 if you want to try to use 32bits data I/O (the driver will
    330 # fall back to 16bits I/O if 32bits I/O are not functional).
    331 # Some controllers pass the initial 32bit test, but will fail later.
    332 wdc0	at isa? port 0x1f0 irq 14 flags 0x00
    333 wdc1	at isa? port 0x170 irq 15 flags 0x00
    334 
    335 # IDE drives
    336 wd*	at wdc? drive ?			# the drives themselves
    337 
    338 # ATAPI bus support
    339 atapibus* at wdc?
    340 
    341 # ATAPI devices
    342 cd*	at atapibus? drive ?		# ATAPI CD-ROM drives
    343 #sd*	at atapibus? drive ?		# ATAPI disk drives
    344 
    345 
    346 # Miscellaneous mass storage devices
    347 
    348 # ISA floppy
    349 fdc0	at isa? port 0x3f0 irq 6 drq 2	# standard PC floppy controllers
    350 #fdc1	at isa? port 0x370 irq ? drq ?
    351 fd*	at fdc? drive ?			# the drives themselves
    352 # some machines need you to do this instead of fd*
    353 #fd0	at fdc0 drive 0
    354 
    355 # ISA CD-ROM devices
    356 #mcd0	at isa? port 0x300 irq 10	# Mitsumi CD-ROM drives
    357 
    358 # ISA tape devices
    359 # note: the wt driver conflicts unpleasantly with ed devices at the
    360 # same I/O address. The probe reprograms their EEPROMs. Don't
    361 # uncomment it unless you are actually using it.
    362 #wt0	at isa? port 0x308 irq 5 drq 1	# Archive and Wangtek QIC tape drives
    363 
    364 
    365 # Network Interfaces
    366 
    367 # PCI network interfaces
    368 #de*	at pci? dev ? function ?	# DEC 21x4x-based Ethernet
    369 #en*	at pci? dev ? function ?	# ENI/Adaptec ATM
    370 #ep*	at pci? dev ? function ?	# 3Com 3c59x/3c90x Ethernet
    371 #fpa*	at pci? dev ? function ?	# DEC DEFPA FDDI
    372 #fxp*	at pci? dev ? function ?	# Intel EtherExpress PRO 10+/100B
    373 #le*	at pci? dev ? function ?	# PCnet-PCI Ethernet
    374 #ne*	at pci? dev ? function ?	# NE2000-compatible Ethernet
    375 #tl*	at pci? dev ? function ?	# ThunderLAN-based Ethernet
    376 
    377 # EISA network interfaces
    378 #ep*	at eisa? slot ?			# 3Com 3c579 Ethernet
    379 #fea*	at eisa? slot ?			# DEC DEFEA FDDI
    380 
    381 # ISA Plug-and-Play network interfaces
    382 #ep*	at isapnp?			# 3Com 3c509 Ethernet
    383 #ne*	at isapnp?			# NE2000-compatible Ethernet
    384 
    385 # PCMCIA network interfaces
    386 ep*	at pcmcia? function ?		# 3Com 3c589 and 3c562 Ethernet
    387 mbe*	at pcmcia? function ?		# MB8696x based Ethernet
    388 ne*	at pcmcia? function ?		# NE2000-compatible Ethernet
    389 sm*	at pcmcia? function ?		# Megahertz Ethernet
    390 
    391 # ISA network interfaces
    392 ate0	at isa? port 0x2a0 irq ?		# AT1700
    393 ec0	at isa? port 0x250 iomem 0xd8000 irq 9	# 3Com 3c503 Ethernet
    394 eg0	at isa? port 0x280 irq 9		# 3C505 ethernet cards
    395 el0	at isa? port 0x300 irq 9		# 3C501 ethernet cards
    396 ep0	at isa? port ? irq ?			# 3C509 ethernet cards
    397 ef0	at isa? port 0x360 iomem 0xd0000 irq 7	# 3C507
    398 ai0	at isa? port 0x360 iomem 0xd0000 irq 7	# StarLAN
    399 fmv0	at isa? port 0x2a0 irq ?		# FMV-180 series
    400 ix0	at isa? port 0x300 irq 10		# EtherExpress/16
    401 iy0	at isa? port 0x360 irq ?		# EtherExpress PRO 10 ISA
    402 lc0	at isa? port 0x320 iomem ? irq ?	# DEC EtherWORKS III (LEMAC)
    403 #depca0	at isa? port 0x300 iomem 0xc8000 iosiz 0x8000 irq 5	# DEPCA
    404 #le*	at depca?
    405 #nele0	at isa? port 0x320 irq 9 drq 7		# NE2100
    406 #le*	at nele?
    407 #bicc0	at isa? port 0x320 irq 10 drq 7		# BICC IsoLan
    408 #le*	at bicc?
    409 ne0	at isa? port 0x280 irq 9		# NE[12]000 ethernet cards
    410 ne1	at isa? port 0x300 irq 10
    411 sm0	at isa? port 0x300 irq 10		# SMC91C9x Ethernet
    412 we0	at isa? port 0x280 iomem 0xd0000 irq 9	# WD/SMC Ethernet
    413 we1	at isa? port 0x300 iomem 0xcc000 irq 10
    414 
    415 # MII bus support
    416 #mii*	at tl?
    417 
    418 # MII PHY network interfaces
    419 #tlphy*	at mii? dev ?			# ThunderLAN PHYs
    420 #nsphy*	at mii? dev ?			# NS and compatible PHYs
    421 
    422 
    423 # Audio Devices
    424 
    425 # ISA Plug-and-Play audio devices
    426 #guspnp*	at isapnp?			# Gravis Ultra Sound PnP audio
    427 #sb*	at isapnp?			# SoundBlaster-compatible audio
    428 
    429 # ISA audio devices
    430 #gus0	at isa? port 0x220 irq 7 drq 1 drq2 6	# Gravis Ultra Sound
    431 #pas0	at isa? port 0x220 irq 7 drq 1		# ProAudio Spectrum
    432 #pss0	at isa? port 0x220 irq 7 drq 6  	# Personal Sound System
    433 #sp0	at pss0 port 0x530 irq 10 drq 0		# 	sound port driver
    434 #sb0	at isa? port 0x220 irq 7 drq 1 drq2 5	# SoundBlaster
    435 #wss0	at isa? port 0x530 irq 10 drq 0	drq2 1	# Windows Sound System
    436 
    437 # Audio support
    438 #audio*	at gus?
    439 #audio*	at guspnp?
    440 #audio*	at pas?
    441 #audio*	at sb?
    442 #audio*	at sp?
    443 #audio*	at wss?
    444 
    445 # The spkr driver provides a simple tone interface to the built in speaker.
    446 #spkr0	at pcppi?		# PC speaker
    447 
    448 
    449 # Mice
    450 
    451 # ISA busmice
    452 #olms0	at isa? port 0x23c irq 5	# Logitech bus mouse
    453 #olms1	at isa? port 0x238 irq 5
    454 #omms0	at isa? port 0x23c irq 5	# Microsoft InPort mouse
    455 #omms1	at isa? port 0x238 irq 5
    456 #opms0	at pc? irq 12		# PS/2 auxiliary port mouse
    457 
    458 
    459 # Joysticks
    460 
    461 # ISA Plug-and-Play joysticks
    462 #joy*	at isapnp?			# Game ports (usually on audio cards)
    463 
    464 # ISA joysticks. Probe is a little strange; add only if you have one.
    465 #joy0	at isa? port 0x201
    466 
    467 
    468 # Miscellaneous Devices
    469 
    470 # Planetconnect Satellite receiver driver.
    471 #satlink0 at isa? port 0x300 drq 1
    472 
    473 
    474 # Pull in optional local configuration
    475 include	"arch/i386/conf/GENERIC.local"
    476 
    477 
    478 # Pseudo-Devices
    479 
    480 # disk/mass storage pseudo-devices
    481 #pseudo-device	ccd		4	# concatenated/striped disk devices
    482 pseudo-device	md		1	# memory disk device (ramdisk)
    483 #pseudo-device	vnd		4	# disk-like interface to files
    484 
    485 # network pseudo-devices
    486 #pseudo-device	bpfilter	8	# Berkeley packet filter
    487 #pseudo-device	ipfilter		# IP filter (firewall) and NAT
    488 pseudo-device	loop			# network loopback
    489 #pseudo-device	ppp		2	# Point-to-Point Protocol
    490 #pseudo-device	sl		2	# Serial Line IP
    491 #pseudo-device	strip		2	# Starmode Radio IP (Metricom)
    492 #pseudo-device	tun		2	# network tunneling over tty
    493 
    494 # miscellaneous pseudo-devices
    495 pseudo-device	pty		2	# pseudo-terminals (Sysinst needs two)
    496 #pseudo-device	tb		1	# tablet line discipline
    497 #pseudo-device	rnd			# /dev/random and in-kernel generator
    498 #options 	RND_COM			# use "com" randomness as well (BROKEN)
    499