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INSTALL revision 1.111
      1 #	$NetBSD: INSTALL,v 1.111 1999/03/15 07:22:18 christos Exp $
      2 #
      3 #	INSTALL - Installation kernel.
      4 #
      5 #	This kernel should be derived from GENERIC with some features
      6 #	commented out.
      7 #
      8 #	This kernel does NOT support X, mice, audio devices, non-NetBSD
      9 #	emulation.
     10 #
     11 
     12 include "arch/i386/conf/std.i386"
     13 
     14 # Enable the hooks used for initializing the root memory-disk.
     15 options 	MEMORY_DISK_HOOKS
     16 options 	MEMORY_DISK_IS_ROOT	# force root on memory disk
     17 options 	MEMORY_DISK_SERVER=0	# no userspace memory disk support
     18 options 	MINIROOTSIZE=3174	# size of memory disk, in blocks
     19 #options 	MINIROOTSIZE=2880	# 1.44M, same as a floppy
     20 
     21 maxusers	32		# estimated number of users
     22 
     23 # CPU support.  At least one is REQUIRED.
     24 options 	I386_CPU
     25 options 	I486_CPU
     26 options 	I586_CPU
     27 options 	I686_CPU
     28 
     29 # CPU-related options.
     30 options 	MATH_EMULATE	# floating point emulation
     31 #options 	VM86		# virtual 8086 emulation
     32 #options 	USER_LDT	# user-settable LDT; used by WINE
     33 # eliminate delay no-ops in I/O; recommended on all but very old machines
     34 #options 	DUMMY_NOPS
     35 
     36 # Misc. i386-specific options
     37 #options 	XSERVER		# X server support in console drivers
     38 
     39 # This option allows you to force a serial console at the specified
     40 # I/O address.
     41 #options 	"CONSDEVNAME=\"com\"",CONADDR=0x3f8,CONSPEED=9600
     42 
     43 # The following options override the memory sizes passed in from the boot
     44 # block.  Use them *only* if the boot block is unable to determine the correct
     45 # values.  Note that the BIOS may *correctly* report less than 640k of base
     46 # memory if the extended BIOS data area is located at the top of base memory
     47 # (as is the case on most recent systems).
     48 #options 	REALBASEMEM=...	# size of base memory
     49 #options 	REALEXTMEM=...	# size of extended memory
     50 
     51 # Avoid irq 5 and 7, the most likely cause of problems on modern laptops.
     52 options		PCIC_ISA_INTR_ALLOC_MASK=0xff5f
     53 
     54 # Standard system options
     55 
     56 #options 	UCONSOLE	# users can use TIOCCONS (for xconsole)
     57 options 	INSECURE	# disable kernel security levels
     58 
     59 options 	RTC_OFFSET=0	# hardware clock is this many mins. west of GMT
     60 #options 	NTP		# NTP phase/frequency locked loop
     61 
     62 #options 	KTRACE		# system call tracing via ktrace(1)
     63 
     64 #options 	SYSVMSG		# System V-like message queues
     65 #options 	SYSVSEM		# System V-like semaphores
     66 #options 	SYSVSHM		# System V-like memory sharing
     67 #options 	SHMMAXPGS=1024	# 1024 pages is the default
     68 
     69 #options 	LKM		# loadable kernel modules
     70 
     71 # Diagnostic/debugging support options
     72 #options 	DIAGNOSTIC	# cheap kernel consistency checks
     73 #options 	DEBUG		# expensive debugging checks/support
     74 #options 	KMEMSTATS	# kernel memory statistics (vmstat -m)
     75 options 	DDB		# in-kernel debugger
     76 options 	DDB_ONPANIC=0	# do not by default automatically drop to ddb
     77 #options 	DDB_HISTORY_SIZE=100	# enable history editing in DDB
     78 #options 	KGDB		# remote debugger
     79 #options 	"KGDB_DEVNAME=\"com\"",KGDBADDR=0x3f8,KGDBRATE=9600
     80 #makeoptions	DEBUG="-g"	# compile full symbol table
     81 
     82 # Compatibility options
     83 #options 	COMPAT_NOMID	# compatibility with 386BSD, BSDI, NetBSD 0.8,
     84 #options 	COMPAT_09	# NetBSD 0.9,
     85 options 	COMPAT_10	# NetBSD 1.0,
     86 options 	COMPAT_11	# NetBSD 1.1,
     87 options 	COMPAT_12	# NetBSD 1.2,
     88 options 	COMPAT_13	# NetBSD 1.3,
     89 #options 	COMPAT_43	# and 4.3BSD
     90 options 	COMPAT_386BSD_MBRPART # recognize old partition ID
     91 
     92 #options 	COMPAT_SVR4	# binary compatibility with SVR4
     93 #options 	COMPAT_IBCS2	# binary compatibility with SCO and ISC
     94 #options 	COMPAT_LINUX	# binary compatibility with Linux
     95 #options 	COMPAT_FREEBSD	# binary compatibility with FreeBSD
     96 
     97 # Executable format options
     98 options 	EXEC_ELF32	# 32-bit ELF executables (SVR4, Linux)
     99 
    100 # File systems
    101 file-system 	FFS		# UFS
    102 file-system 	EXT2FS		# second extended file system (linux)
    103 #file-system 	LFS		# log-structured file system
    104 file-system 	MFS		# memory file system
    105 file-system 	NFS		# Network File System client
    106 file-system 	CD9660		# ISO 9660 + Rock Ridge file system
    107 file-system 	MSDOSFS		# MS-DOS file system
    108 #file-system 	FDESC		# /dev/fd
    109 file-system 	KERNFS		# /kern
    110 #file-system 	NULLFS		# loopback file system
    111 #file-system 	PORTAL		# portal filesystem (still experimental)
    112 #file-system 	PROCFS		# /proc
    113 #file-system 	UMAPFS		# NULLFS + uid and gid remapping
    114 #file-system 	UNION		# union file system
    115 
    116 # File system options
    117 #options 	QUOTA		# UFS quotas
    118 #options 	NFSSERVER	# Network File System server
    119 #options 	EXT2FS_SYSTEM_FLAGS # makes ext2fs file flags (append and
    120 				# immutable) behave as system flags.
    121 
    122 # Networking options
    123 #options 	GATEWAY		# packet forwarding
    124 options 	INET		# IP + ICMP + TCP + UDP
    125 #options 	MROUTING	# IP multicast routing
    126 #options 	NS		# XNS
    127 #options 	NSIP		# XNS tunneling over IP
    128 #options 	ISO,TPIP	# OSI
    129 #options 	EON		# OSI tunneling over IP
    130 #options 	CCITT,LLC,HDLC	# X.25
    131 #options 	NETATALK	# AppleTalk networking protocols
    132 #options 	PPP_BSDCOMP	# BSD-Compress compression support for PPP
    133 #options 	PPP_DEFLATE	# Deflate compression support for PPP
    134 #options 	PPP_FILTER	# Active filter support for PPP (requires bpf)
    135 #options 	PFIL_HOOKS	# pfil(9) packet filter hooks
    136 
    137 # Compatibility with 4.2BSD implementation of TCP/IP.  Not recommended.
    138 #options 	TCP_COMPAT_42
    139 
    140 # These options enable verbose messages for several subsystems.
    141 # Warning, these may compile large string tables into the kernel!
    142 #options 	EISAVERBOSE	# verbose EISA device autoconfig messages
    143 #options 	PCIVERBOSE	# verbose PCI device autoconfig messages
    144 #options 	PCMCIAVERBOSE	# verbose PCMCIA configuration messages
    145 #options 	SCSIVERBOSE	# human readable SCSI error messages
    146 
    147 # Kernel root file system and dump configuration.
    148 config		netbsd	root on ? type ?
    149 #config		netbsd	root on sd0a type ffs
    150 #config		netbsd	root on ? type nfs
    151 
    152 #
    153 # Device configuration
    154 #
    155 
    156 mainbus0 at root
    157 
    158 #apm0	at mainbus0			# Advanced power management
    159 
    160 
    161 # Basic Bus Support
    162 
    163 # PCI bus support
    164 pci*	at mainbus? bus ?
    165 pci*	at pchb? bus ?
    166 pci*	at ppb? bus ?
    167 
    168 # PCI bridges
    169 pchb*	at pci? dev ? function ?	# PCI-Host bridges
    170 pceb*	at pci? dev ? function ?	# PCI-EISA bridges
    171 pcib*	at pci? dev ? function ?	# PCI-ISA bridges
    172 ppb*	at pci? dev ? function ?	# PCI-PCI bridges
    173 # XXX 'puc's aren't really bridges, but there's no better place for them here
    174 puc*	at pci? dev ? function ?	# PCI "universal" comm. cards
    175 
    176 # EISA bus support
    177 eisa*	at mainbus?
    178 eisa*	at pceb?
    179 
    180 # ISA bus support
    181 isa*	at mainbus?
    182 isa*	at pceb?
    183 isa*	at pcib?
    184 
    185 # PCMCIA bus support
    186 pcmcia*	at pcic? controller ? socket ?
    187 
    188 # ISA PCMCIA controllers
    189 pcic0	at isa? port 0x3e0 iomem 0xd0000 iosiz 0x4000
    190 pcic1	at isa? port 0x3e2 iomem 0xd4000 iosiz 0x4000
    191 
    192 # ISA Plug-and-Play bus support
    193 isapnp0	at isa?
    194 
    195 
    196 # Coprocessor Support
    197 
    198 # Math Coprocessor support
    199 npx0	at isa? port 0xf0 irq 13	# x86 math coprocessor
    200 
    201 
    202 # Console Devices
    203 
    204 # ISA console.  You can only configure one of these!
    205 pc0	at isa? port 0x60 irq 1		# pccons generic PC console driver
    206 #vt0	at isa? port 0x60 irq 1		# PCVT console driver
    207 
    208 # Keyboard layout configuration for pccons
    209 #options 	FRENCH_KBD
    210 #options 	FINNISH_KBD
    211 #options 	GERMAN_KBD
    212 #options 	NORWEGIAN_KBD
    213 
    214 #pcppi0	at isa?
    215 #sysbeep0	at pcppi?
    216 
    217 # Serial Devices
    218 
    219 # PCI serial interfaces
    220 com*	at puc? port ?			# 16x450s 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 pcmcom*	at pcmcia? function ?		# PCMCIA multi-port serial cards
    230 com*	at pcmcom? slave ?		# ...and the slave devices
    231 
    232 # ISA serial interfaces
    233 #options 	COM_HAYESP		# adds Hayes ESP serial board support
    234 com0	at isa? port 0x3f8 irq 4	# Standard PC serial ports
    235 com1	at isa? port 0x2f8 irq 3
    236 com2	at isa? port 0x3e8 irq 5
    237 #com3	at isa? port 0x2e8 irq 9
    238 #ast0	at isa? port 0x1a0 irq 5	# AST 4-port serial cards
    239 #com*	at ast? slave ?
    240 #boca0	at isa? port 0x100 irq 5	# BOCA 8-port serial cards
    241 #com*	at boca? slave ?
    242 #rtfps0	at isa? port 0x1230 irq 10	# RT 4-port serial cards
    243 #com*	at rtfps? slave ?
    244 #cy0	at isa? iomem 0xd4000 irq 12	# Cyclades serial cards
    245 
    246 
    247 # Parallel Printer Interfaces
    248 
    249 # PCI parallel printer interfaces
    250 #lpt*	at puc? port ?			# || ports on "universal" comm boards
    251 
    252 # ISA parallel printer interfaces
    253 #lpt0	at isa? port 0x378 irq 7	# standard PC parallel ports
    254 #lpt1	at isa? port 0x278
    255 #lpt2	at isa? port 0x3bc
    256 
    257 
    258 # SCSI Controllers and Devices
    259 
    260 # PCI SCSI controllers
    261 adv*	at pci? dev ? function ?	# AdvanSys 1200A[B], 9xx[U,UA] SCSI
    262 adw*	at pci? dev ? function ?	# AdvanSys 9xxUW SCSI
    263 ahc*	at pci? dev ? function ?	# Adaptec [23]94x, aic78x0 SCSI
    264 bha*	at pci? dev ? function ?	# BusLogic 9xx SCSI
    265 isp*	at pci? dev ? function ?	# Qlogic ISP [12]0x0 SCSI/FibreChannel
    266 ncr*	at pci? dev ? function ?	# NCR 53c8xx SCSI
    267 pcscp*	at pci? dev ? function ?	# AMD 53c974 PCscsi-PCI SCSI
    268 
    269 # EISA SCSI controllers
    270 ahb*	at eisa? slot ?			# Adaptec 174[02] SCSI
    271 ahc*	at eisa? slot ?			# Adaptec 274x, aic7770 SCSI
    272 bha*	at eisa? slot ?			# BusLogic 7xx SCSI
    273 uha*	at eisa? slot ?			# UltraStor 24f SCSI
    274 
    275 # PCMCIA SCSI controllers
    276 aic*	at pcmcia? function ?		# Adaptec APA-1460 SCSI
    277 
    278 # ISA Plug-and-Play SCSI controllers
    279 aic*	at isapnp?			# Adaptec AHA-1520B
    280 
    281 # ISA SCSI controllers
    282 aha0	at isa? port 0x330 irq ? drq ?	# Adaptec 154[02] SCSI
    283 aha1	at isa? port 0x334 irq ? drq ?
    284 ahc0	at isa? port ? irq ?		# Adaptec 284x SCSI
    285 aic0	at isa? port 0x340 irq 11	# Adaptec 152[02] SCSI
    286 bha0	at isa? port 0x330 irq ? drq ?	# BusLogic [457]4X SCSI
    287 bha1	at isa? port 0x334 irq ? drq ?
    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 adv?
    296 scsibus* at adw?
    297 scsibus* at aha?
    298 scsibus* at ahb?
    299 scsibus* at ahc?
    300 scsibus* at aic?
    301 scsibus* at bha?
    302 scsibus* at isp?
    303 scsibus* at ncr?
    304 scsibus* at pcscp?
    305 scsibus* at sea?
    306 scsibus* at uha?
    307 scsibus* at wds?
    308 
    309 # SCSI devices
    310 sd*	at scsibus? target ? lun ?	# SCSI disk drives
    311 st*	at scsibus? target ? lun ?	# SCSI tape drives
    312 cd*	at scsibus? target ? lun ?	# SCSI CD-ROM drives
    313 #ch*	at scsibus? target ? lun ?	# SCSI autochangers
    314 #ss*	at scsibus? target ? lun ?	# SCSI scanners
    315 #uk*	at scsibus? target ? lun ?	# SCSI unknown
    316 
    317 
    318 # IDE and related devices
    319 # PCI IDE controllers - see pciide(4) for suppored hardware.
    320 # The 0x0001 flag force the driver to use DMA, even if the driver doesn't know
    321 # how to set up DMA modes for this chip. This may work, or may cause
    322 # a machine hang with some controllers.
    323 pciide* at pci ? dev ? function ? flags 0x0000
    324 
    325 # ISA Plug-and-Play IDE controllers
    326 wdc*    at isapnp?
    327 
    328 # PCMCIA IDE controllers
    329 wdc*    at pcmcia? function ?   
    330 
    331 # ISA ST506, ESDI, and IDE controllers
    332 wdc0	at isa? port 0x1f0 irq 14	# ST506, ESDI, and IDE controllers
    333 wdc1	at isa? port 0x170 irq 15
    334 
    335 # IDE drives
    336 # Flags are used only with controllers that support DMA operations
    337 # and mode settings (e.g. some pciide controllers)
    338 # The lowest order four bits (rightmost digit) of the flags define the PIO
    339 # mode to use, the next set of four bits the DMA mode and the third set the
    340 # UltraDMA mode. For each set of four bits, the 3 lower bits define the mode
    341 # to use, and the last bit must be 1 for this setting to be used.
    342 # For DMA and UDMA, 0xf (1111) means 'disable'.
    343 # 0x0fac means 'use PIO mode 4, DMA mode 2, disable UltraDMA'.
    344 # (0xc=1100, 0xa=1010, 0xf=1111)
    345 # 0x0000 means "use whatever the drive claims to support".
    346 wd*	at pciide? channel ? drive ?
    347 wd*	at wdc? channel ? drive ?
    348 
    349 # ATAPI bus support
    350 atapibus* at pciide? channel ?
    351 atapibus* at wdc? channel ?
    352 
    353 # ATAPI devices
    354 cd*	at atapibus? drive ?		# ATAPI CD-ROM drives
    355 sd*	at atapibus? drive ?		# ATAPI disk drives
    356 
    357 
    358 # Miscellaneous mass storage devices
    359 
    360 # ISA floppy
    361 fdc0	at isa? port 0x3f0 irq 6 drq 2	# standard PC floppy controllers
    362 #fdc1	at isa? port 0x370 irq ? drq ?
    363 fd*	at fdc? drive ?			# the drives themselves
    364 # some machines need you to do this instead of fd*
    365 #fd0	at fdc0 drive 0
    366 
    367 # ISA CD-ROM devices
    368 #mcd0	at isa? port 0x300 irq 10	# Mitsumi CD-ROM drives
    369 
    370 # ISA tape devices
    371 # note: the wt driver conflicts unpleasantly with ed devices at the
    372 # same I/O address. The probe reprograms their EEPROMs. Don't
    373 # uncomment it unless you are actually using it.
    374 #wt0	at isa? port 0x308 irq 5 drq 1	# Archive and Wangtek QIC tape drives
    375 
    376 
    377 # Network Interfaces
    378 
    379 # PCI network interfaces
    380 de*	at pci? dev ? function ?	# DEC 21x4x-based Ethernet
    381 en*	at pci? dev ? function ?	# ENI/Adaptec ATM
    382 ep*	at pci? dev ? function ?	# 3Com 3c59x
    383 ex*	at pci? dev ? function ?	# 3Com 90x[B]
    384 epic*	at pci? dev ? function ?	# SMC EPIC/100 Ethernet
    385 fpa*	at pci? dev ? function ?	# DEC DEFPA FDDI
    386 fxp*	at pci? dev ? function ?	# Intel EtherExpress PRO 10+/100B
    387 le*	at pci? dev ? function ?	# PCnet-PCI Ethernet
    388 ne*	at pci? dev ? function ?	# NE2000-compatible Ethernet
    389 tl*	at pci? dev ? function ?	# ThunderLAN-based Ethernet
    390 
    391 # EISA network interfaces
    392 ep*	at eisa? slot ?			# 3Com 3c579 Ethernet
    393 fea*	at eisa? slot ?			# DEC DEFEA FDDI
    394 
    395 # ISA Plug-and-Play network interfaces
    396 ep*	at isapnp?			# 3Com 3c509 Ethernet
    397 ne*	at isapnp?			# NE2000-compatible Ethernet
    398 
    399 # PCMCIA network interfaces
    400 ep*	at pcmcia? function ?		# 3Com 3c589 and 3c562 Ethernet
    401 mbe*	at pcmcia? function ?		# MB8696x based Ethernet
    402 ne*	at pcmcia? function ?		# NE2000-compatible Ethernet
    403 sm*	at pcmcia? function ?		# Megahertz Ethernet
    404 
    405 # ISA network interfaces
    406 ate0	at isa? port 0x2a0 irq ?		# AT1700
    407 cs0	at isa? port 0x300 iomem ? irq ? drq ?	# CS8900 Ethernet
    408 ec0	at isa? port 0x250 iomem 0xd8000 irq 9	# 3Com 3c503 Ethernet
    409 eg0	at isa? port 0x280 irq 9		# 3C505 ethernet cards
    410 el0	at isa? port 0x300 irq 9		# 3C501 ethernet cards
    411 ep0	at isa? port ? irq ?			# 3C509 ethernet cards
    412 ef0	at isa? port 0x360 iomem 0xd0000 irq 7	# 3C507
    413 ai0	at isa? port 0x360 iomem 0xd0000 irq 7	# StarLAN
    414 fmv0	at isa? port 0x2a0 irq ?		# FMV-180 series
    415 ix0	at isa? port 0x300 irq 10		# EtherExpress/16
    416 iy0	at isa? port 0x360 irq ?		# EtherExpress PRO 10 ISA
    417 lc0	at isa? port 0x320 iomem ? irq ?	# DEC EtherWORKS III (LEMAC)
    418 #depca0	at isa? port 0x300 iomem 0xc8000 iosiz 0x8000 irq 5	# DEPCA
    419 #le*	at depca?
    420 #nele0	at isa? port 0x320 irq 9 drq 7		# NE2100
    421 #le*	at nele?
    422 #bicc0	at isa? port 0x320 irq 10 drq 7		# BICC IsoLan
    423 #le*	at bicc?
    424 ne0	at isa? port 0x280 irq 9		# NE[12]000 ethernet cards
    425 ne1	at isa? port 0x300 irq 10
    426 sm0	at isa? port 0x300 irq 10		# SMC91C9x Ethernet
    427 we0	at isa? port 0x280 iomem 0xd0000 irq 9	# WD/SMC Ethernet
    428 we1	at isa? port 0x300 iomem 0xcc000 irq 10
    429 
    430 # MII/PHY support
    431 exphy*	at mii? phy ?			# 3Com internal PHYs
    432 nsphy*	at mii? phy ?			# NS83840 PHYs
    433 qsphy*	at mii? phy ?			# Quality Semiconductor QS6612 PHYs
    434 icsphy*	at mii? phy ?			# Integrated Circuit Systems ICS1890
    435 inphy*	at mii? phy ?			# Intel 82555 PHYs
    436 lxtphy*	at mii? phy ?			# Level One LXT-970 PHYs
    437 sqphy*	at mii? phy ?			# Seeq 80220/80221/80223 PHYs
    438 tlphy*	at mii? phy ?			# ThunderLAN PHYs
    439 ukphy*	at mii? phy ?			# generic unknown PHYs
    440 
    441 # Audio Devices
    442 
    443 # ISA Plug-and-Play audio devices
    444 #guspnp*	at isapnp?			# Gravis Ultra Sound PnP audio
    445 #sb*	at isapnp?			# SoundBlaster-compatible audio
    446 
    447 # ISA audio devices
    448 #gus0	at isa? port 0x220 irq 7 drq 1 drq2 6	# Gravis Ultra Sound
    449 #pas0	at isa? port 0x220 irq 7 drq 1		# ProAudio Spectrum
    450 #pss0	at isa? port 0x220 irq 7 drq 6  	# Personal Sound System
    451 #sp0	at pss0 port 0x530 irq 10 drq 0		# 	sound port driver
    452 #sb0	at isa? port 0x220 irq 7 drq 1 drq2 5	# SoundBlaster
    453 #wss0	at isa? port 0x530 irq 10 drq 0	drq2 1	# Windows Sound System
    454 
    455 # Audio support
    456 #audio*	at gus?
    457 #audio*	at guspnp?
    458 #audio*	at pas?
    459 #audio*	at sb?
    460 #audio*	at sp?
    461 #audio*	at wss?
    462 
    463 # The spkr driver provides a simple tone interface to the built in speaker.
    464 #spkr0	at pcppi?		# PC speaker
    465 
    466 
    467 # Mice
    468 
    469 # ISA busmice
    470 #olms0	at isa? port 0x23c irq 5	# Logitech bus mouse
    471 #olms1	at isa? port 0x238 irq 5
    472 #omms0	at isa? port 0x23c irq 5	# Microsoft InPort mouse
    473 #omms1	at isa? port 0x238 irq 5
    474 #opms0	at pc? irq 12		# PS/2 auxiliary port mouse
    475 
    476 
    477 # Joysticks
    478 
    479 # ISA Plug-and-Play joysticks
    480 #joy*	at isapnp?			# Game ports (usually on audio cards)
    481 
    482 # ISA joysticks. Probe is a little strange; add only if you have one.
    483 #joy0	at isa? port 0x201
    484 
    485 
    486 # Miscellaneous Devices
    487 
    488 # Planetconnect Satellite receiver driver.
    489 #satlink0 at isa? port 0x300 drq 1
    490 
    491 
    492 # Pull in optional local configuration
    493 include	"arch/i386/conf/GENERIC.local"
    494 
    495 
    496 # Pseudo-Devices
    497 
    498 # disk/mass storage pseudo-devices
    499 #pseudo-device	ccd		4	# concatenated/striped disk devices
    500 pseudo-device	md		1	# memory disk device (ramdisk)
    501 #pseudo-device	vnd		4	# disk-like interface to files
    502 
    503 # network pseudo-devices
    504 #pseudo-device	bpfilter	8	# Berkeley packet filter
    505 #pseudo-device	ipfilter		# IP filter (firewall) and NAT
    506 pseudo-device	loop			# network loopback
    507 pseudo-device	ppp		2	# Point-to-Point Protocol
    508 pseudo-device	sl		2	# Serial Line IP
    509 #pseudo-device	strip		2	# Starmode Radio IP (Metricom)
    510 #pseudo-device	tun		2	# network tunneling over tty
    511 
    512 # miscellaneous pseudo-devices
    513 pseudo-device	pty		64	# pseudo-terminals
    514 #pseudo-device	tb		1	# tablet line discipline
    515 
    516 # rnd is EXPERIMENTAL at this point.
    517 #pseudo-device	rnd			# /dev/random and in-kernel generator
    518 #options 	RND_COM			# use "com" randomness as well (BROKEN)
    519