GENERIC revision 1.221 1 # $NetBSD: GENERIC,v 1.221 2002/11/30 07:06:41 itohy Exp $
2 #
3 # GENERIC machine description file
4 #
5 # This machine description file is used to generate the default NetBSD
6 # kernel. The generic kernel on NetBSD/alpha does enough to get booted,
7 # etc., but not much more. For a more complete kernel see the ALPHA
8 # machine description file.
9 #
10 # The machine description file can be customised for your specific
11 # machine to reduce the kernel size and improve its performance.
12 #
13 # For further information on compiling NetBSD kernels, see the config(8)
14 # man page.
15 #
16 # For further information on hardware support for this architecture, see
17 # the intro(4) man page. For further information about kernel options
18 # for this architecture, see the options(4) man page. For an explanation
19 # of each device driver in this file see the section 4 man page for the
20 # device.
21
22 # If you add stuff to this, please add it to the ALPHA configuration, too.
23
24 include "arch/alpha/conf/std.alpha"
25
26 options INCLUDE_CONFIG_FILE # embed config file in kernel binary
27
28 #ident "GENERIC-$Revision: 1.221 $"
29
30 maxusers 32
31
32 # CPU Support
33 options DEC_2000_300 # "Jensen": 2000/300 (DECpc AXP 150)
34 options DEC_2100_A50 # Avanti etc: AlphaStation 400, 200, etc.
35 options DEC_2100_A500 # Sable: AlphaServer 2100
36 options DEC_2100A_A500 # Lynx: AlphaServer 2100A
37 options DEC_3000_500 # Flamingo etc: 3000/[4-9]00*
38 options DEC_3000_300 # Pelican etc: 3000/300*
39 options DEC_AXPPCI_33 # NoName: AXPpci33, etc.
40 options DEC_EB164 # EB164: AlphaPC 164
41 options DEC_EB64PLUS # EB64+: AlphaPC 64, etc.
42 options DEC_KN20AA # KN20AA: AlphaStation 500 and 600
43 options DEC_KN8AE # KN8AE: AlphaServer 8200 and 8400
44 options DEC_KN300 # KN300: AlphaServer 4100 and 1200
45 options DEC_550 # Miata: Digital Personal Workstation
46 options DEC_1000 # Mikasa etc: Digital AlphaServer 1000
47 options DEC_1000A # Corelle etc: Digital AlphaServer 800/1000A
48 options DEC_ALPHABOOK1 # AlphaBook1: Tadpole/DEC AlphaBook
49 options DEC_EB66 # EB66: 21066 Evaluation Board
50 options DEC_6600 # EV6: 264DP OEM Board
51 options API_UP1000 # EV6: Alpha Processor, Inc. UP1000
52
53 # Standard system options
54 options KTRACE # System call tracing support
55 options SYSTRACE # System call vetting via systrace(1)
56 options NTP # kernel PLL for NTP
57
58 # Enable experimental buffer queue strategy for better responsiveness under
59 # high disk I/O load. Use it with caution - it's not proven to be stable yet.
60 #options NEW_BUFQ_STRATEGY
61
62 # Diagnostic/debugging support options
63 options DIAGNOSTIC # Cheap kernel consistency checks
64 options DDB # kernel debugger
65 #makeoptions DEBUG="-g"
66 #makeoptions DEBUGLIST="pattern1 pattern2 ..."
67
68 #options KGDB # Remote kernel GDB support
69 #options KGDB_DEVNAME="\"com\"" # device to use for KGDB
70 #options KGDB_DEVADDR=0x2f8 # at this address
71 #options KGDB_DEVRATE=57600 # at this comm. rate
72
73 # File systems
74 file-system FFS # Fast file system
75 file-system MFS # Memory-based file system
76 file-system CD9660 # ISO-9660 CD-ROM FS (w/RockRidge extensions)
77 file-system MSDOSFS # MS-DOS-compatible file system
78 file-system NTFS # Windows/NT file system (experimental)
79 file-system NFS # Sun NFS-compatible file system client
80 file-system KERNFS # Kernel variable file system (/kern)
81 file-system PROCFS # Process file system (/proc)
82
83 # File system options
84 options QUOTA # UFS quotas
85 #options FFS_EI # FFS Endian Independant support
86 options SOFTDEP # FFS soft updates support.
87 options NFSSERVER # Sun NFS-compatible file system server
88
89 # Networking options
90 options INET # Internet protocol suite
91 options INET6 # IPV6
92 #options IPSEC # IP security
93 #options IPSEC_ESP # IP security (encryption part; define w/IPSEC)
94 #options IPSEC_DEBUG # debug for IP security
95 #options NETATALK # AppleTalk protocol suite
96
97 # 4.3BSD compatibility. Should be optional, but necessary for now.
98 options COMPAT_43
99
100 # Binary compatibility with previous versions of NetBSD.
101 #options COMPAT_09
102 options COMPAT_10
103 options COMPAT_11
104 options COMPAT_12
105 options COMPAT_13
106 options COMPAT_14
107
108 # OSF/1 binary compatibility
109 options COMPAT_OSF1
110
111 # Linux binary compatibility
112 options COMPAT_LINUX
113
114 # System V-like message queues
115 options SYSVMSG
116 #options SEMMNI=10 # number of semaphore identifiers
117 #options SEMMNS=60 # number of semaphores in system
118 #options SEMUME=10 # max number of undo entries per process
119 #options SEMMNU=30 # number of undo structures in system
120
121 # System V-like semaphores
122 options SYSVSEM
123
124 # System V-like shared memory
125 options SYSVSHM
126 #options SHMMAXPGS=1024 # 1024 pages is the default
127
128 # Loadable Kernel Modules
129 options LKM
130
131 # Disable kernel security.
132 #options INSECURE
133
134 # Misc. options
135 options EISAVERBOSE # recognize "unknown" EISA devices
136 options PCIVERBOSE # recognize "unknown" PCI devices
137 options MIIVERBOSE # verbose PHY autoconfig messages
138 #options PCI_CONFIG_DUMP # verbosely dump PCI config space
139 options SCSIVERBOSE # Verbose SCSI errors
140 options TCVERBOSE # recognize "unknown" TC devices
141 options UCONSOLE # users can use TIOCCONS (for xconsole)
142 #options PCMCIAVERBOSE
143 options USERCONF # userconf(4) support
144 #options PIPE_SOCKETPAIR # smaller, but slower pipe(2)
145 options FONT_GALLANT12x22 # Console font for TC devices
146
147 # The Alpha console firmware network boots using the BOOTP
148 # protocol, so we ask the NFS code to use BOOTP/DHCP as well,
149 # in case we have NFS root.
150 options NFS_BOOT_DHCP # superset of BOOTP
151
152 # WS console uses SUN or VT100 terminal emulation
153 options WSEMUL_VT100
154
155 # realtime clock compatible to OSF/1
156 #options CLOCK_COMPAT_OSF1
157
158 config netbsd root on ? type ?
159 #config netbsd root on sd0 type ffs
160 #config netbsd root on ? type nfs
161
162 mainbus0 at root
163 cpu* at mainbus0
164
165 # TurboLaser bus support and devices
166 tlsb* at mainbus0
167 gbus* at tlsb? node ? offset ?
168 tlsbmem* at tlsb? node ? offset ?
169 kft* at tlsb? node ? offset ?
170
171 # Gbus Devices
172 mcclock* at gbus? offset ?
173
174 # MCBUS bus support
175 mcbus* at mainbus0
176 mcmem* at mcbus? mid ?
177
178 #i2c at mcbus?
179
180 #EV6 Tsunami Core Logic
181
182 tsc* at mainbus0
183
184 # DECpc AXP150 (Jensen) internal bus support
185 jensenio* at mainbus0
186
187 com* at jensenio? port ?
188 lpt* at jensenio? port ?
189 mcclock* at jensenio? port ?
190 pckbc* at jensenio? port ?
191
192 # TURBOchannel host bus adapter support
193 tcasic* at mainbus0
194
195 # TURBOchannel bus support
196 tc* at tcasic?
197
198 # TURBOchannel devices
199 ioasic* at tc? slot ? offset ?
200 mcclock* at ioasic? offset ?
201 le* at ioasic? offset ?
202 zsc0 at ioasic? offset 0x100000
203 zsc1 at ioasic? offset 0x180000
204 bba0 at ioasic? offset ?
205 audio* at bba?
206 tcds* at tc? slot ? offset ?
207 asc* at tcds? chip ?
208 asc* at tc? slot ? offset ?
209 le* at tc? slot ? offset ?
210 fta* at tc? slot ? offset ? # DEC DEFTA FDDI cards
211 cfb* at tc? slot ? offset ?
212 mfb* at tc? slot ? offset ?
213 tfb* at tc? slot ? offset ?
214 sfb* at tc? slot ? offset ?
215 #sfbp* at tc? slot ? offset ?
216 px* at tc? slot ? offset ?
217 pxg* at tc? slot ? offset ?
218
219 # TurboChannel serial attachments
220 zstty* at zsc? channel ? # serial ports on B channels
221 lkkbd0 at zsc1 channel ? # keyboard port on A channels
222 vsms0 at zsc0 channel ? # mouse port on A channels
223
224 # PCI host bus adapter support
225 apecs* at mainbus?
226 cia* at mainbus?
227 irongate* at mainbus?
228 lca* at mainbus?
229 dwlpx* at kft?
230 mcpcia* at mcbus? mid ?
231 tsp* at tsc?
232 ttwoga* at mainbus?
233
234 # Sable PCI and STDIO bus and devices
235 ttwopci* at ttwoga? hose ?
236 sableio* at ttwopci? bus ?
237 com* at sableio? port ?
238 lpt* at sableio? port ?
239 pckbc* at sableio? port ?
240 fdc* at sableio? port ?
241
242 # PCI bus support
243 pci* at apecs?
244 pci* at cia?
245 pci* at irongate?
246 pci* at lca?
247 pci* at ppb?
248 pci* at dwlpx?
249 pci* at mcpcia?
250 pci* at tsp?
251 pci* at ttwopci?
252
253 # AGP support
254 agp* at irongate?
255
256 # PCI devices
257 adv* at pci? dev ? function ? # AdvanSys SCSI
258 adw* at pci? dev ? function ? # AdvanSys Wide SCSI
259 #options SCSI_ADW_WDTR_DISABLE # disable WDTR
260 #options SCSI_ADW_SDTR_DISABLE # disable SDTR
261 #options SCSI_ADW_TAGQ_DISABLE # disable Tag Queuing
262 ahc* at pci? dev ? function ? # Adaptec [23]94x, aic78x0 SCSI
263 autri* at pci? dev ? function ? # Trident 4DWAVE based AC'97 Audio
264 bha* at pci? dev ? function ? # BusLogic 9xx SCSI (untested)
265 cac* at pci? dev ? function ? # Compaq array controller (untested)
266 cmpci* at pci? dev ? function ? # C-Media CMI8338/8738 Audio
267 cy* at pci? dev ? function ? # Cyclades Cyclom-Y (untested)
268 cz* at pci? dev ? function ? # Cyclades-Z (untested)
269 dpt* at pci? dev ? function ? # DPT SmartCache/SmartRAID
270 eap* at pci? dev ? function ? # Ensoniq AudioPCI
271 en* at pci? dev ? function ? # ENI PCI ATM (untested)
272 ep* at pci? dev ? function ? # 3COM 3c59x
273 epic* at pci? dev ? function ? # SMC EPIC/100 Ethernet
274 eso* at pci? dev ? function ? # ESS Solo-1 PCI AudioDrive
275 ex* at pci? dev ? function ? # 3COM 3c90x[BC] Ethernet
276 fpa* at pci? dev ? function ? # DEC DEFPA FDDI
277 fxp* at pci? dev ? function ? # Intel EEPRO 10+/100B
278 gsip* at pci? dev ? function ? # NS DP83820 Gigabit Ethernet
279 iha* at pci? dev ? function ? # Initio INIC-940/950 SCSI
280 isp* at pci? dev ? function ? # Qlogic ISP 10x0 SCSI
281 le* at pci? dev ? function ? # PCI LANCE Ethernet (untested)
282 sf* at pci? dev ? function ? # Adaptec AIC-6915 Ethernet
283 siop* at pci? dev ? function ? # Symbios 53c8xx SCSI
284 mlx* at pci? dev ? function ? # Mylex DAC960 / DEC SWXCR (untested)
285 ne* at pci? dev ? function ? # NE2000-compatible Ethernet
286 ohci* at pci? dev ? function ? # USB Open Host Controller
287 pceb* at pci? dev ? function ? # Intel PCI-EISA Bridges
288 pciide* at pci? dev ? function ? # PCI IDE controllers
289 pcscp* at pci? dev ? function ? # AMD Am53c974 PCscsi-PCI
290 ppb* at pci? dev ? function ? # PCI-PCI Bridges
291 rtk* at pci? dev ? function ? # RealTek 8129/8139 Ethernet
292 sio* at pci? dev ? function ? # Intel PCI-ISA Bridges
293 sip* at pci? dev ? function ? # SiS 900 Ethernet
294 sv* at pci? dev ? function ? # S3 SonicVibes
295 tga* at pci? dev ? function ? # DEC ZLXp-E[123] Graphics
296 ti* at pci? dev ? function ? # Alteon Tigon Gig-E
297 tl* at pci? dev ? function ? # TI ThunderLAN Ethernet
298 tlp* at pci? dev ? function ? # DECchip 21x4x and clones
299 uhci* at pci? dev ? function ? # USB Univ. Host Controller
300 vga* at pci? dev ? function ? # PCI VGA Graphics
301 vr* at pci? dev ? function ? # VIA Rhine Fast Ethernet
302 yds* at pci? dev ? function ? # Yamaha DS-1 PCI Audio
303
304 audio* at cmpci?
305 audio* at eap?
306 audio* at eso?
307 audio* at sv?
308 audio* at yds?
309 audio* at ess?
310
311 opl* at cmpci? flags 1
312 opl* at eso?
313 #opl* at sv?
314 opl* at yds?
315
316 midi* at opl?
317
318 mpu* at cmpci?
319 mpu* at eso?
320 mpu* at yds?
321
322 midi* at mpu?
323
324 # MII/PHY support
325 exphy* at mii? phy ? # 3Com internal PHYs
326 icsphy* at mii? phy ? # Integrated Circuit Systems ICS189x
327 inphy* at mii? phy ? # Intel 82555 PHYs
328 lxtphy* at mii? phy ? # Level One LXT-970 PHYs
329 gphyter* at mii? phy ? # NS83861 Gig-E PHY
330 nsphy* at mii? phy ? # NS83840 PHYs
331 qsphy* at mii? phy ? # Quality Semiconductor QS6612 PHYs
332 sqphy* at mii? phy ? # Seeq 80220/80221/80223 PHYs
333 tlphy* at mii? phy ? # ThunderLAN PHYs
334 ukphy* at mii? phy ? # generic unknown PHYs
335
336 # ISA/EISA bus support
337 isa* at jensenio?
338 eisa* at jensenio?
339 isa* at pceb?
340 eisa* at pceb?
341 isa* at sio?
342 #isapnp* at isa?
343
344 # ISA devices
345 mcclock* at isa? port 0x70
346 pckbc* at isa? # PC keyboard controller
347 pckbd* at pckbc? # PC keyboard (kbd port)
348 pms* at pckbc? # PS/2-style mouse (aux port)
349 pcppi* at isa? # PC prog. periph. interface
350 spkr0 at pcppi? # IBM BASIC emulation
351 isabeep0 at pcppi? # "keyboard" beep
352 midi* at pcppi?
353 com* at isa? port 0x3f8 irq 4 # standard serial ports
354 com* at isa? port 0x2f8 irq 3
355 cs* at isa? port 0x300 iomem ? irq ? drq ? # CS8900 Ethernet
356 ec0 at isa? port 0x250 iomem 0xd8000 irq 9 # 3Com 3c503 Ethernet
357 ep* at isa? port ? irq ? # 3COM 3c509 Ethernet
358 #ep* at isapnp?
359 #ix0 at isa? port 0x300 irq 10 # EtherExpress/16
360 #iy0 at isa? port 0x360 irq ? # EtherExpress PRO 10 ISA
361 fdc0 at isa? port 0x3f0 irq 6 drq 2 # floppy controller
362 lc0 at isa? port 0x300 iomem ? irq ? # DEC EtherWORKS III (LEMAC)
363 lc1 at isa? port 0x320 iomem ? irq ? # DEC EtherWORKS III (LEMAC)
364 depca0 at isa? port 0x300 iomem 0xd0000 iosiz 0x10000 irq 5 # DEPCA
365 depca1 at isa? port 0x200 iomem 0xd8000 iosiz 0x8000 irq 10 # DEPCA
366 le* at depca?
367 lpt* at isa? port 0x3bc irq 7 # standard parallel port
368 vga* at isa? # ISA (EISA: XXX) VGA
369 wdc0 at isa? port 0x1f0 irq 14 # ST506/ESDI/IDE controllers
370 wdc1 at isa? port 0x170 irq 15
371 #wdc* at isapnp?
372 we0 at isa? port 0x280 iomem 0xd0000 irq 9 # WD/SMC Ethernet
373 we1 at isa? port 0x300 iomem 0xcc000 irq 10
374 #wss* at isa? port 0x530 irq 9 drq 0 # Windows Sound System
375 #wss* at isapnp?
376 #audio* at wss?
377 #midi* at wss?
378
379 ess0 at isa? port 0x220 irq 5 drq 1 drq2 5 # ESS 18XX
380 sb* at isa? port 0x220 irq 5 drq 1 # SoundBlaster
381 #sb* at isapnp?
382 audio* at sb?
383 #adv* at isa? port ? irq ? drq ? # AdvanSys APB-514[02]
384 aha* at isa? port 0x330 irq ? drq ? # Adaptec 154[02] SCSI
385 aha* at isa? port 0x334 irq ? drq ? # Adaptec 154[02] SCSI
386 bha* at isa? port 0x330 irq ? drq ? # BusLogic [57]4X SCSI (unt.)
387 bha* at isa? port 0x334 irq ? drq ? # BusLogic [57]4X SCSI (unt.)
388 uha* at isa? port 0x330 irq ? drq ? # UltraStor [13]4f SCSI (unt.)
389 uha* at isa? port 0x334 irq ? drq ? # UltraStor [13]4f SCSI (unt.)
390 pcic0 at isa? port 0x3e0 iomem 0xd0000 iosiz 0x10000
391 pcic1 at isa? port 0x3e2 iomem 0xcc000 iosiz 0x10000
392 pcmcia* at pcic? controller ? socket ?
393
394 # EISA devices
395 ahb* at eisa? slot ? # Adaptec 174[024] SCSI (unt.)
396 ahc* at eisa? slot ? # Adaptec 274x, aic7770 SCSI
397 bha* at eisa? slot ? # BusLogic 7xx SCSI
398 ep* at eisa? slot ? # 3COM 3c579 Ethernet (untested)
399 fea* at eisa? slot ? # DEC DEFEA FDDI
400 mlx* at eisa? slot ? # Mylex DAC960 / DEC SWXCR (untested)
401 tlp* at eisa? slot ? # DEC DE-425 Ethernet
402 depca* at eisa? slot ? # DEC DE-422 Ethernet
403 le* at depca?
404 uha* at eisa? slot ? # UltraStor 24f SCSI (unt.)
405
406 # PCMCIA device
407 aic* at pcmcia? function ? # Adaptec APA-1460 SCSI
408 com* at pcmcia? function ? # Modems and serial cards
409 wdc* at pcmcia? function ? # PCMCIA IDE controllers
410 ep* at pcmcia? function ? # 3Com 3c589 and 3c562 Eth.
411 mbe* at pcmcia? function ? # MB8696x based Ethernet
412 ne* at pcmcia? function ? # NE2000-compatible Eth.
413 sm* at pcmcia? function ? # Megahertz Ethernet
414 ray* at pcmcia? function ? # Raytheon Raylink (802.11)
415 wi* at pcmcia? function ? # Lucent WaveLAN/IEEE
416
417 # SCSI bus support
418 scsibus* at adv?
419 scsibus* at adw?
420 scsibus* at aha?
421 scsibus* at ahb?
422 scsibus* at ahc?
423 scsibus* at aic?
424 scsibus* at asc?
425 scsibus* at bha?
426 scsibus* at dpt?
427 scsibus* at iha?
428 scsibus* at isp?
429 scsibus* at siop?
430 scsibus* at pcscp?
431 scsibus* at uha?
432
433 # SCSI devices
434 cd* at scsibus? target ? lun ? # SCSI CD-ROM drives
435 sd* at scsibus? target ? lun ? # SCSI disk drives
436 st* at scsibus? target ? lun ? # SCSI tape drives
437
438 # ST506/ESDI/IDE devices
439 wd* at pciide? channel ?
440 wd* at wdc? drive ?
441
442 # ATAPI bus support
443 atapibus* at pciide? channel ?
444 atapibus* at wdc?
445
446 # ATAPI devices
447 sd* at atapibus? drive ? # ATAPI disk devices
448 cd* at atapibus? drive ? # ATAPI CD-ROM devices
449
450 # Floppy drives
451 fd* at fdc? drive ?
452
453 # Hardware RAID devices
454 ld* at cac? unit ?
455 ld* at mlx? unit ?
456
457 # USB bus support
458 usb* at uhci?
459 usb* at ohci?
460
461 # USB Hubs
462 uhub* at usb?
463 uhub* at uhub? port ? configuration ? interface ?
464
465 # USB HID device
466 uhidev* at uhub? port ? configuration ? interface ?
467
468 # USB Mice
469 ums* at uhidev? reportid ?
470 wsmouse* at ums?
471
472 # USB Keyboards
473 ukbd* at uhidev? reportid ?
474 wskbd* at ukbd? console ?
475
476 # USB Generic HID devices
477 uhid* at uhidev? reportid ?
478
479 # USB Printer
480 ulpt* at uhub? port ? configuration ? interface ?
481
482 # USB Modem
483 umodem* at uhub? port ? configuration ?
484 ucom* at umodem?
485
486 # USB Mass Storage
487 umass* at uhub? port ? configuration ? interface ?
488 atapibus* at umass? channel ?
489 scsibus* at umass? channel ?
490
491 # USB Ethernet adapters
492 aue* at uhub? port ? # ADMtek AN986 Pegasus based adapters
493 cue* at uhub? port ? # CATC USB-EL1201A based adapters
494 kue* at uhub? port ? # Kawasaki LSI KL5KUSB101B based adapters
495
496 # Serial adapters
497 # FTDI FT8U100AX serial adapter
498 uftdi* at uhub? port ?
499 ucom* at uftdi? portno ?
500
501 # USB scanners
502 uscanner* at uhub? port ?
503
504 # Y@P firmware loader
505 uyap* at uhub? port ?
506
507 # D-Link DSB-R100 USB FM radio tuner
508 udsbr* at uhub? port ?
509 radio* at udsbr?
510
511 # USB Generic driver
512 ugen* at uhub? port ?
513
514 # Workstation Console attachments
515 wsdisplay* at cfb?
516 wsdisplay* at mfb?
517 wsdisplay* at tfb?
518 wsdisplay* at sfb?
519 #wsdisplay* at sfbp?
520 wsdisplay* at px?
521 wsdisplay* at pxg?
522 wsdisplay* at vga?
523 wsdisplay* at tga?
524 wskbd* at lkkbd? console ?
525 wsmouse* at vsms?
526 wskbd* at pckbd?
527 wsmouse* at pms?
528
529 pseudo-device bpfilter 16
530 pseudo-device ccd 4
531 #pseudo-device cgd 4 # cryptographic disk devices
532 pseudo-device raid 8 # RAIDframe disk driver
533 options RAID_AUTOCONFIG # auto-configuration of RAID components
534 # Options to enable various other RAIDframe RAID types.
535 # options RF_INCLUDE_EVENODD=1
536 # options RF_INCLUDE_RAID5_RS=1
537 # options RF_INCLUDE_PARITYLOGGING=1
538 # options RF_INCLUDE_CHAINDECLUSTER=1
539 # options RF_INCLUDE_INTERDECLUSTER=1
540 # options RF_INCLUDE_PARITY_DECLUSTERING=1
541 # options RF_INCLUDE_PARITY_DECLUSTERING_DS=1
542 pseudo-device ipfilter 1
543 pseudo-device loop 1
544 pseudo-device md 1
545 pseudo-device ppp 4
546 pseudo-device pppoe # PPP over Ethernet (RFC 2516)
547 pseudo-device pty # pseudo-terminals
548 pseudo-device sl 4
549 pseudo-device vnd 4
550 #pseudo-device gre 2 # generic L3 over IP tunnel
551 pseudo-device gif 4 # IPv[46] over IPv[46] tunnel (RFC1933)
552 #pseudo-device faith 1 # IPv[46] tcp relay translation i/f
553 #pseudo-device stf 1 # 6to4 IPv6 over IPv4 encapsulation
554 pseudo-device vlan # IEEE 802.1q encapsulation
555 pseudo-device bridge # simple inter-network bridging
556 pseudo-device sequencer 1 # MIDI sequencer
557 pseudo-device rnd # /dev/random and in-kernel generator
558 #options RND_COM # use "com" randomness too
559 pseudo-device clockctl # user control of clock subsystem
560