1 February 2003 Kernel Parameters v2.5.59
2 ~~~~~~~~~~~~~~~~~
3
4 The following is a consolidated list of the kernel parameters as implemented
5 (mostly) by the __setup() macro and sorted into English Dictionary order
6 (defined as ignoring all punctuation and sorting digits before letters in a
7 case insensitive manner), and with descriptions where known.
8
9 Module parameters for loadable modules are specified only as the
10 parameter name with optional '=' and value as appropriate, such as:
11
12 modprobe usbcore blinkenlights=1
13
14 Module parameters for modules that are built into the kernel image
15 are specified on the kernel command line with the module name plus
16 '.' plus parameter name, with '=' and value if appropriate, such as:
17
18 usbcore.blinkenlights=1
19
20 The text in square brackets at the beginning of the description state the
21 restrictions on the kernel for the said kernel parameter to be valid. The
22 restrictions referred to are that the relevant option is valid if:
23
24 ACPI ACPI support is enabled.
25 ALSA ALSA sound support is enabled.
26 APIC APIC support is enabled.
27 APM Advanced Power Management support is enabled.
28 AX25 Appropriate AX.25 support is enabled.
29 CD Appropriate CD support is enabled.
30 DEVFS devfs support is enabled.
31 DRM Direct Rendering Management support is enabled.
32 EDD BIOS Enhanced Disk Drive Services (EDD) is enabled
33 EFI EFI Partitioning (GPT) is enabled
34 EIDE EIDE/ATAPI support is enabled.
35 FB The frame buffer device is enabled.
36 HW Appropriate hardware is enabled.
37 IA-32 IA-32 aka i386 architecture is enabled.
38 IA-64 IA-64 architecture is enabled.
39 IOSCHED More than one I/O scheduler is enabled.
40 IP_PNP IP DCHP, BOOTP, or RARP is enabled.
41 ISAPNP ISA PnP code is enabled.
42 ISDN Appropriate ISDN support is enabled.
43 JOY Appropriate joystick support is enabled.
44 LP Printer support is enabled.
45 LOOP Loopback device support is enabled.
46 M68k M68k architecture is enabled.
47 These options have more detailed description inside of
48 Documentation/m68k/kernel-options.txt.
49 MCA MCA bus support is enabled.
50 MDA MDA console support is enabled.
51 MOUSE Appropriate mouse support is enabled.
52 MTD MTD support is enabled.
53 NET Appropriate network support is enabled.
54 NUMA NUMA support is enabled.
55 NFS Appropriate NFS support is enabled.
56 OSS OSS sound support is enabled.
57 PARIDE The ParIDE subsystem is enabled.
58 PARISC The PA-RISC architecture is enabled.
59 PCI PCI bus support is enabled.
60 PCMCIA The PCMCIA subsystem is enabled.
61 PNP Plug & Play support is enabled.
62 PPC PowerPC architecture is enabled.
63 PPT Parallel port support is enabled.
64 PS2 Appropriate PS/2 support is enabled.
65 RAM RAM disk support is enabled.
66 S390 S390 architecture is enabled.
67 SCSI Appropriate SCSI support is enabled.
68 A lot of drivers has their options described inside of
69 Documentation/scsi/.
70 SERIAL Serial support is enabled.
71 SMP The kernel is an SMP kernel.
72 SPARC Sparc architecture is enabled.
73 SWSUSP Software suspension is enabled.
74 TS Appropriate touchscreen support is enabled.
75 USB USB support is enabled.
76 V4L Video For Linux support is enabled.
77 VGA The VGA console has been enabled.
78 VT Virtual terminal support is enabled.
79 WDT Watchdog support is enabled.
80 XT IBM PC/XT MFM hard disk support is enabled.
81
82 In addition, the following text indicates that the option:
83
84 BUGS= Relates to possible processor bugs on the said processor.
85 KNL Is a kernel start-up parameter.
86 BOOT Is a boot loader parameter.
87
88 Parameters denoted with BOOT are actually interpreted by the boot
89 loader, and have no meaning to the kernel directly.
90 Do not modify the syntax of boot loader parameters without extreme
91 need or coordination with <Documentation/i386/boot.txt>.
92
93 Note that ALL kernel parameters listed below are CASE SENSITIVE, and that
94 a trailing = on the name of any parameter states that that parameter will
95 be entered as an environment variable, whereas its absence indicates that
96 it will appear as a kernel argument readable via /proc/cmdline by programs
97 running once the system is up.
98
99 53c7xx= [HW,SCSI] Amiga SCSI controllers
100 See header of drivers/scsi/53c7xx.c.
101 See also Documentation/scsi/ncr53c7xx.txt.
102
103 acpi= [HW,ACPI] Advanced Configuration and Power Interface
104 Format: { force | off | ht | strict }
105 force -- enable ACPI if default was off
106 off -- disable ACPI if default was on
107 noirq -- do not use ACPI for IRQ routing
108 ht -- run only enough ACPI to enable Hyper Threading
109 strict -- Be less tolerant of platforms that are not
110 strictly ACPI specification compliant.
111
112 See also Documentation/pm.txt, pci=noacpi
113
114 acpi_sleep= [HW,ACPI] Sleep options
115 Format: { s3_bios, s3_mode }
116 See Documentation/power/video.txt
117
118 acpi_sci= [HW,ACPI] ACPI System Control Interrupt trigger mode
119 Format: { level | edge | high | low }
120
121 acpi_irq_balance [HW,ACPI] ACPI will balance active IRQs
122 default in APIC mode
123
124 acpi_irq_nobalance [HW,ACPI] ACPI will not move active IRQs (default)
125 default in PIC mode
126
127 acpi_irq_pci= [HW,ACPI] If irq_balance, Clear listed IRQs for use by PCI
128 Format: <irq>,<irq>...
129
130 acpi_irq_isa= [HW,ACPI] If irq_balance, Mark listed IRQs used by ISA
131 Format: <irq>,<irq>...
132
133 acpi_osi= [HW,ACPI] empty param disables _OSI
134
135 acpi_serialize [HW,ACPI] force serialization of AML methods
136
137 acpi_skip_timer_override [HW,ACPI]
138 Recognize and ignore IRQ0/pin2 Interrupt Override.
139 For broken nForce2 BIOS resulting in XT-PIC timer.
140
141 acpi_dbg_layer= [HW,ACPI]
142 Format: <int>
143 Each bit of the <int> indicates an acpi debug layer,
144 1: enable, 0: disable. It is useful for boot time
145 debugging. After system has booted up, it can be set
146 via /proc/acpi/debug_layer.
147
148 acpi_dbg_level= [HW,ACPI]
149 Format: <int>
150 Each bit of the <int> indicates an acpi debug level,
151 1: enable, 0: disable. It is useful for boot time
152 debugging. After system has booted up, it can be set
153 via /proc/acpi/debug_level.
154
155 acpi_fake_ecdt [HW,ACPI] Workaround failure due to BIOS lacking ECDT
156
157 ad1816= [HW,OSS]
158 Format: <io>,<irq>,<dma>,<dma2>
159 See also Documentation/sound/oss/AD1816.
160
161 ad1848= [HW,OSS]
162 Format: <io>,<irq>,<dma>,<dma2>,<type>
163
164 adlib= [HW,OSS]
165 Format: <io>
166
167 advansys= [HW,SCSI]
168 See header of drivers/scsi/advansys.c.
169
170 advwdt= [HW,WDT] Advantech WDT
171 Format: <iostart>,<iostop>
172
173 aedsp16= [HW,OSS] Audio Excel DSP 16
174 Format: <io>,<irq>,<dma>,<mss_io>,<mpu_io>,<mpu_irq>
175 See also header of sound/oss/aedsp16.c.
176
177 aha152x= [HW,SCSI]
178 See Documentation/scsi/aha152x.txt.
179
180 aha1542= [HW,SCSI]
181 Format: <portbase>[,<buson>,<busoff>[,<dmaspeed>]]
182
183 aic7xxx= [HW,SCSI]
184 See Documentation/scsi/aic7xxx.txt.
185
186 aic79xx= [HW,SCSI]
187 See Documentation/scsi/aic79xx.txt.
188
189 AM53C974= [HW,SCSI]
190 Format: <host-scsi-id>,<target-scsi-id>,<max-rate>,<max-offset>
191 See also header of drivers/scsi/AM53C974.c.
192
193 amijoy.map= [HW,JOY] Amiga joystick support
194 Map of devices attached to JOY0DAT and JOY1DAT
195 Format: <a>,<b>
196 See also Documentation/kernel/input/joystick.txt
197
198 analog.map= [HW,JOY] Analog joystick and gamepad support
199 Specifies type or capabilities of an analog joystick
200 connected to one of 16 gameports
201 Format: <type1>,<type2>,..<type16>
202
203 apc= [HW,SPARC] Power management functions (SPARCstation-4/5 + deriv.)
204 Format: noidle
205 Disable APC CPU standby support. SPARCstation-Fox does
206 not play well with APC CPU idle - disable it if you have
207 APC and your system crashes randomly.
208
209 apic= [APIC,i386] Change the output verbosity whilst booting
210 Format: { quiet (default) | verbose | debug }
211 Change the amount of debugging information output
212 when initialising the APIC and IO-APIC components.
213
214 apm= [APM] Advanced Power Management
215 See header of arch/i386/kernel/apm.c.
216
217 applicom= [HW]
218 Format: <mem>,<irq>
219
220 arcrimi= [HW,NET] ARCnet - "RIM I" (entirely mem-mapped) cards
221 Format: <io>,<irq>,<nodeID>
222
223 ataflop= [HW,M68k]
224
225 atarimouse= [HW,MOUSE] Atari Mouse
226
227 atascsi= [HW,SCSI] Atari SCSI
228
229 atkbd.extra= [HW] Enable extra LEDs and keys on IBM RapidAccess,
230 EzKey and similar keyboards
231
232 atkbd.reset= [HW] Reset keyboard during initialization
233
234 atkbd.set= [HW] Select keyboard code set
235 Format: <int> (2 = AT (default) 3 = PS/2)
236
237 atkbd.scroll= [HW] Enable scroll wheel on MS Office and similar
238 keyboards
239
240 atkbd.softraw= [HW] Choose between synthetic and real raw mode
241 Format: <bool> (0 = real, 1 = synthetic (default))
242
243 atkbd.softrepeat=
244 [HW] Use software keyboard repeat
245
246 autotest [IA64]
247
248 awe= [HW,OSS] AWE32/SB32/AWE64 wave table synth
249 Format: <io>,<memsize>,<isapnp>
250
251 aztcd= [HW,CD] Aztech CD268 CDROM driver
252 Format: <io>,0x79 (?)
253
254 baycom_epp= [HW,AX25]
255 Format: <io>,<mode>
256
257 baycom_par= [HW,AX25] BayCom Parallel Port AX.25 Modem
258 Format: <io>,<mode>
259 See header of drivers/net/hamradio/baycom_par.c.
260
261 baycom_ser_fdx= [HW,AX25] BayCom Serial Port AX.25 Modem (Full Duplex Mode)
262 Format: <io>,<irq>,<mode>[,<baud>]
263 See header of drivers/net/hamradio/baycom_ser_fdx.c.
264
265 baycom_ser_hdx= [HW,AX25] BayCom Serial Port AX.25 Modem (Half Duplex Mode)
266 Format: <io>,<irq>,<mode>
267 See header of drivers/net/hamradio/baycom_ser_hdx.c.
268
269 blkmtd_device= [HW,MTD]
270 blkmtd_erasesz=
271 blkmtd_ro=
272 blkmtd_bs=
273 blkmtd_count=
274
275 bttv.card= [HW,V4L] bttv (bt848 + bt878 based grabber cards)
276 bttv.radio= Most important insmod options are available as kernel args too.
277 bttv.pll= See Documentation/video4linux/bttv/Insmod-options
278 bttv.tuner= and Documentation/video4linux/bttv/CARDLIST
279
280 BusLogic= [HW,SCSI]
281 See drivers/scsi/BusLogic.c, comment before function
282 BusLogic_ParseDriverOptions().
283
284 c101= [NET] Moxa C101 synchronous serial card
285
286 cachesize= [BUGS=IA-32] Override level 2 CPU cache size detection.
287 Sometimes CPU hardware bugs make them report the cache
288 size incorrectly. The kernel will attempt work arounds
289 to fix known problems, but for some CPUs it is not
290 possible to determine what the correct size should be.
291 This option provides an override for these situations.
292
293 cdu31a= [HW,CD]
294 Format: <io>,<irq>[,PAS]
295 See header of drivers/cdrom/cdu31a.c.
296
297 chandev= [HW,NET] Generic channel device initialisation
298
299 clock= [BUGS=IA-32, HW] gettimeofday timesource override.
300 Forces specified timesource (if avaliable) to be used
301 when calculating gettimeofday(). If specicified timesource
302 is not avalible, it defaults to PIT.
303 Format: { pit | tsc | cyclone | pmtmr }
304
305 hpet= [IA-32,HPET] option to disable HPET and use PIT.
306 Format: disable
307
308 cm206= [HW,CD]
309 Format: { auto | [<io>,][<irq>] }
310
311 com20020= [HW,NET] ARCnet - COM20020 chipset
312 Format: <io>[,<irq>[,<nodeID>[,<backplane>[,<ckp>[,<timeout>]]]]]
313
314 com90io= [HW,NET] ARCnet - COM90xx chipset (IO-mapped buffers)
315 Format: <io>[,<irq>]
316
317 com90xx= [HW,NET] ARCnet - COM90xx chipset (memory-mapped buffers)
318 Format: <io>[,<irq>[,<memstart>]]
319
320 condev= [HW,S390] console device
321 conmode=
322
323 console= [KNL] Output console device and options.
324
325 tty<n> Use the virtual console device <n>.
326
327 ttyS<n>[,options]
328 Use the specified serial port. The options are of
329 the form "bbbbpn", where "bbbb" is the baud rate,
330 "p" is parity ("n", "o", or "e"), and "n" is bits.
331 Default is "9600n8".
332
333 See also Documentation/serial-console.txt.
334
335 uart,io,<addr>[,options]
336 uart,mmio,<addr>[,options]
337 Start an early, polled-mode console on the 8250/16550
338 UART at the specified I/O port or MMIO address,
339 switching to the matching ttyS device later. The
340 options are the same as for ttyS, above.
341
342 cpcihp_generic= [HW,PCI] Generic port I/O CompactPCI driver
343 Format: <first_slot>,<last_slot>,<port>,<enum_bit>[,<debug>]
344
345 cpia_pp= [HW,PPT]
346 Format: { parport<nr> | auto | none }
347
348 cs4232= [HW,OSS]
349 Format: <io>,<irq>,<dma>,<dma2>,<mpuio>,<mpuirq>
350
351 cs89x0_dma= [HW,NET]
352 Format: <dma>
353
354 cs89x0_media= [HW,NET]
355 Format: { rj45 | aui | bnc }
356
357 cyclades= [HW,SERIAL] Cyclades multi-serial port adapter.
358
359 dasd= [HW,NET]
360 See header of drivers/s390/block/dasd_devmap.c.
361
362 db9.dev[2|3]= [HW,JOY] Multisystem joystick support via parallel port
363 (one device per port)
364 Format: <port#>,<type>
365 See also Documentation/input/joystick-parport.txt
366
367 debug [KNL] Enable kernel debugging (events log level).
368
369 decnet= [HW,NET]
370 Format: <area>[,<node>]
371 See also Documentation/networking/decnet.txt.
372
373 devfs= [DEVFS]
374 See Documentation/filesystems/devfs/boot-options.
375
376 dhash_entries= [KNL]
377 Set number of hash buckets for dentry cache.
378
379 digi= [HW,SERIAL]
380 IO parameters + enable/disable command.
381
382 digiepca= [HW,SERIAL]
383 See drivers/char/README.epca and
384 Documentation/digiepca.txt.
385
386 dmascc= [HW,AX25,SERIAL] AX.25 Z80SCC driver with DMA
387 support available.
388 Format: <io_dev0>[,<io_dev1>[,..<io_dev32>]]
389
390 dmasound= [HW,OSS] Sound subsystem buffers
391
392 dscc4.setup= [NET]
393
394 dtc3181e= [HW,SCSI]
395
396 earlyprintk= [x86, x86_64]
397 earlyprintk=vga
398 earlyprintk=serial[,ttySn[,baudrate]]
399
400 Append ,keep to not disable it when the real console
401 takes over.
402
403 Only vga or serial at a time, not both.
404
405 Currently only ttyS0 and ttyS1 are supported.
406
407 Interaction with the standard serial driver is not
408 very good.
409
410 The VGA output is eventually overwritten by the real
411 console.
412
413 eata= [HW,SCSI]
414
415 eda= [HW,PS2]
416
417 edb= [HW,PS2]
418
419 edd= [EDD]
420 Format: {"of[f]" | "sk[ipmbr]"}
421 See comment in arch/i386/boot/edd.S
422
423 eicon= [HW,ISDN]
424 Format: <id>,<membase>,<irq>
425
426 eisa_irq_edge= [PARISC,HW]
427 See header of drivers/parisc/eisa.c.
428
429 elanfreq= [IA-32]
430 See comment before function elanfreq_setup() in
431 arch/i386/kernel/cpu/cpufreq/elanfreq.c.
432
433 elevator= [IOSCHED]
434 Format: {"as"|"cfq"|"deadline"|"noop"}
435 See Documentation/block/as-iosched.txt
436 and Documentation/block/deadline-iosched.txt for details.
437
438 es1370= [HW,OSS]
439 Format: <lineout>[,<micbias>]
440 See also header of sound/oss/es1370.c.
441
442 es1371= [HW,OSS]
443 Format: <spdif>,[<nomix>,[<amplifier>]]
444 See also header of sound/oss/es1371.c.
445
446 ether= [HW,NET] Ethernet cards parameters
447 This option is obsoleted by the "netdev=" option, which
448 has equivalent usage. See its documentation for details.
449
450 eurwdt= [HW,WDT] Eurotech CPU-1220/1410 onboard watchdog.
451 Format: <io>[,<irq>]
452
453 fd_mcs= [HW,SCSI]
454 See header of drivers/scsi/fd_mcs.c.
455
456 fdomain= [HW,SCSI]
457 See header of drivers/scsi/fdomain.c.
458
459 floppy= [HW]
460 See Documentation/floppy.txt.
461
462 ftape= [HW] Floppy Tape subsystem debugging options.
463 See Documentation/ftape.txt.
464
465 gamecon.map[2|3]=
466 [HW,JOY] Multisystem joystick and NES/SNES/PSX pad
467 support via parallel port (up to 5 devices per port)
468 Format: <port#>,<pad1>,<pad2>,<pad3>,<pad4>,<pad5>
469 See also Documentation/input/joystick-parport.txt
470
471 gamma= [HW,DRM]
472
473 gdth= [HW,SCSI]
474 See header of drivers/scsi/gdth.c.
475
476 gpt [EFI] Forces disk with valid GPT signature but
477 invalid Protective MBR to be treated as GPT.
478
479 gscd= [HW,CD]
480 Format: <io>
481
482 gt96100eth= [NET] MIPS GT96100 Advanced Communication Controller
483
484 gus= [HW,OSS]
485 Format: <io>,<irq>,<dma>,<dma16>
486
487 gvp11= [HW,SCSI]
488
489 hashdist= [KNL,NUMA] Large hashes allocated during boot
490 are distributed across NUMA nodes. Defaults on
491 for IA-64, off otherwise.
492
493 hcl= [IA-64] SGI's Hardware Graph compatibility layer
494
495 hd= [EIDE] (E)IDE hard drive subsystem geometry
496 Format: <cyl>,<head>,<sect>
497
498 hd?= [HW] (E)IDE subsystem
499 hd?lun= See Documentation/ide.txt.
500
501 highmem=nn[KMG] [KNL,BOOT] forces the highmem zone to have an exact
502 size of <nn>. This works even on boxes that have no
503 highmem otherwise. This also works to reduce highmem
504 size on bigger boxes.
505
506 hisax= [HW,ISDN]
507 See Documentation/isdn/README.HiSax.
508
509 hugepages= [HW,IA-32,IA-64] Maximal number of HugeTLB pages.
510
511 noirqbalance [IA-32,SMP,KNL] Disable kernel irq balancing
512
513 i8042.direct [HW] Put keyboard port into non-translated mode
514 i8042.dumbkbd [HW] Pretend that controlled can only read data from
515 keyboard and can not control its state
516 (Don't attempt to blink the leds)
517 i8042.noacpi [HW] Don't use ACPI to discover KBD/AUX controller
518 settings
519 i8042.noaux [HW] Don't check for auxiliary (== mouse) port
520 i8042.nomux [HW] Don't check presence of an active multiplexing
521 controller
522 i8042.reset [HW] Reset the controller during init and cleanup
523 i8042.unlock [HW] Unlock (ignore) the keylock
524
525 i810= [HW,DRM]
526
527 i8k.force [HW] Activate i8k driver even if SMM BIOS signature
528 does not match list of supported models.
529 i8k.power_status
530 [HW] Report power status in /proc/i8k
531 (disabled by default)
532 i8k.restricted [HW] Allow controlling fans only if SYS_ADMIN
533 capability is set.
534
535 ibmmcascsi= [HW,MCA,SCSI] IBM MicroChannel SCSI adapter
536 See Documentation/mca.txt.
537
538 icn= [HW,ISDN]
539 Format: <io>[,<membase>[,<icn_id>[,<icn_id2>]]]
540
541 ide= [HW] (E)IDE subsystem
542 Format: ide=nodma or ide=doubler or ide=reverse
543 See Documentation/ide.txt.
544
545 ide?= [HW] (E)IDE subsystem
546 Format: ide?=noprobe or chipset specific parameters.
547 See Documentation/ide.txt.
548
549 idebus= [HW] (E)IDE subsystem - VLB/PCI bus speed
550 See Documentation/ide.txt.
551
552 idle= [HW]
553 Format: idle=poll or idle=halt
554
555 ihash_entries= [KNL]
556 Set number of hash buckets for inode cache.
557
558 in2000= [HW,SCSI]
559 See header of drivers/scsi/in2000.c.
560
561 init= [KNL]
562 Format: <full_path>
563 Run specified binary instead of /sbin/init as init
564 process.
565
566 initcall_debug [KNL] Trace initcalls as they are executed. Useful
567 for working out where the kernel is dying during
568 startup.
569
570 initrd= [BOOT] Specify the location of the initial ramdisk
571
572 inport.irq= [HW] Inport (ATI XL and Microsoft) busmouse driver
573 Format: <irq>
574
575 inttest= [IA64]
576
577 io7= [HW] IO7 for Marvel based alpha systems
578 See comment before marvel_specify_io7 in
579 arch/alpha/kernel/core_marvel.c.
580
581 ip= [IP_PNP]
582 See Documentation/nfsroot.txt.
583
584 ip2= [HW] Set IO/IRQ pairs for up to 4 IntelliPort boards
585 See comment before ip2_setup() in drivers/char/ip2.c.
586
587 ips= [HW,SCSI] Adaptec / IBM ServeRAID controller
588 See header of drivers/scsi/ips.c.
589
590 isapnp= [ISAPNP]
591 Format: <RDP>, <reset>, <pci_scan>, <verbosity>
592
593 isolcpus= [KNL,SMP] Isolate CPUs from the general scheduler.
594 Format: <cpu number>,...,<cpu number>
595 This option can be used to specify one or more CPUs
596 to isolate from the general SMP balancing and scheduling
597 algorithms. The only way to move a process onto or off
598 an "isolated" CPU is via the CPU affinity syscalls.
599 <cpu number> begins at 0 and the maximum value is
600 "number of CPUs in system - 1".
601
602 This option is the preferred way to isolate CPUs. The
603 alternative - manually setting the CPU mask of all tasks
604 in the system can cause problems and suboptimal load
605 balancer performance.
606
607 isp16= [HW,CD]
608 Format: <io>,<irq>,<dma>,<setup>
609
610 iucv= [HW,NET]
611
612 js= [HW,JOY] Analog joystick
613 See Documentation/input/joystick.txt.
614
615 keepinitrd [HW,ARM]
616
617 l2cr= [PPC]
618
619 lapic [IA-32,APIC] Enable the local APIC even if BIOS disabled it.
620
621 lasi= [HW,SCSI] PARISC LASI driver for the 53c700 chip
622 Format: addr:<io>,irq:<irq>
623
624 llsc*= [IA64]
625 See function print_params() in arch/ia64/sn/kernel/llsc4.c.
626
627 load_ramdisk= [RAM] List of ramdisks to load from floppy
628 See Documentation/ramdisk.txt.
629
630 lockd.udpport= [NFS]
631
632 lockd.tcpport= [NFS]
633
634 logibm.irq= [HW,MOUSE] Logitech Bus Mouse Driver
635 Format: <irq>
636
637 log_buf_len=n Sets the size of the printk ring buffer, in bytes.
638 Format is n, nk, nM. n must be a power of two. The
639 default is set in kernel config.
640
641 lp=0 [LP] Specify parallel ports to use, e.g,
642 lp=port[,port...] lp=none,parport0 (lp0 not configured, lp1 uses
643 lp=reset first parallel port). 'lp=0' disables the
644 lp=auto printer driver. 'lp=reset' (which can be
645 specified in addition to the ports) causes
646 attached printers to be reset. Using
647 lp=port1,port2,... specifies the parallel ports
648 to associate lp devices with, starting with
649 lp0. A port specification may be 'none' to skip
650 that lp device, or a parport name such as
651 'parport0'. Specifying 'lp=auto' instead of a
652 port specification list means that device IDs
653 from each port should be examined, to see if
654 an IEEE 1284-compliant printer is attached; if
655 so, the driver will manage that printer.
656 See also header of drivers/char/lp.c.
657
658 lpj=n [KNL]
659 Sets loops_per_jiffy to given constant, thus avoiding
660 time-consuming boot-time autodetection (up to 250 ms per
661 CPU). 0 enables autodetection (default). To determine
662 the correct value for your kernel, boot with normal
663 autodetection and see what value is printed. Note that
664 on SMP systems the preset will be applied to all CPUs,
665 which is likely to cause problems if your CPUs need
666 significantly divergent settings. An incorrect value
667 will cause delays in the kernel to be wrong, leading to
668 unpredictable I/O errors and other breakage. Although
669 unlikely, in the extreme case this might damage your
670 hardware.
671
672 ltpc= [NET]
673 Format: <io>,<irq>,<dma>
674
675 mac5380= [HW,SCSI]
676 Format: <can_queue>,<cmd_per_lun>,<sg_tablesize>,<hostid>,<use_tags>
677
678 mac53c9x= [HW,SCSI]
679 Format: <num_esps>,<disconnect>,<nosync>,<can_queue>,<cmd_per_lun>,<sg_tablesize>,<hostid>,<use_tags>
680
681 machvec= [IA64]
682 Force the use of a particular machine-vector (machvec) in a generic
683 kernel. Example: machvec=hpzx1_swiotlb
684
685 mad16= [HW,OSS]
686 Format: <io>,<irq>,<dma>,<dma16>,<mpu_io>,<mpu_irq>,<joystick>
687
688 maui= [HW,OSS]
689 Format: <io>,<irq>
690
691 max_loop= [LOOP] Maximum number of loopback devices that can
692 be mounted
693 Format: <1-256>
694
695 maxcpus= [SMP] Maximum number of processors that an SMP kernel
696 should make use of
697
698 max_luns= [SCSI] Maximum number of LUNs to probe
699 Should be between 1 and 2^32-1.
700
701 max_report_luns=
702 [SCSI] Maximum number of LUNs received
703 Should be between 1 and 16384.
704
705 mca-pentium [BUGS=IA-32]
706
707 mcatest= [IA-64]
708
709 mcd= [HW,CD]
710 Format: <port>,<irq>,<mitsumi_bug_93_wait>
711
712 mcdx= [HW,CD]
713
714 mce [IA-32] Machine Check Exception
715
716 md= [HW] RAID subsystems devices and level
717 See Documentation/md.txt.
718
719 mdacon= [MDA]
720 Format: <first>,<last>
721 Specifies range of consoles to be captured by the MDA.
722
723 mem=nn[KMG] [KNL,BOOT] Force usage of a specific amount of memory
724 Amount of memory to be used when the kernel is not able
725 to see the whole system memory or for test.
726 [IA-32] Use together with memmap= to avoid physical
727 address space collisions. Without memmap= PCI devices
728 could be placed at addresses belonging to unused RAM.
729
730 mem=nopentium [BUGS=IA-32] Disable usage of 4MB pages for kernel
731 memory.
732
733 memmap=exactmap [KNL,IA-32] Enable setting of an exact
734 E820 memory map, as specified by the user.
735 Such memmap=exactmap lines can be constructed based on
736 BIOS output or other requirements. See the memmap=nn@ss
737 option description.
738
739 memmap=nn[KMG]@ss[KMG]
740 [KNL] Force usage of a specific region of memory
741 Region of memory to be used, from ss to ss+nn.
742
743 memmap=nn[KMG]#ss[KMG]
744 [KNL,ACPI] Mark specific memory as ACPI data.
745 Region of memory to be used, from ss to ss+nn.
746
747 memmap=nn[KMG]$ss[KMG]
748 [KNL,ACPI] Mark specific memory as reserved.
749 Region of memory to be used, from ss to ss+nn.
750
751 meye.*= [HW] Set MotionEye Camera parameters
752 See Documentation/video4linux/meye.txt.
753
754 mga= [HW,DRM]
755
756 mousedev.tap_time=
757 [MOUSE] Maximum time between finger touching and
758 leaving touchpad surface for touch to be considered
759 a tap and be reported as a left button click (for
760 touchpads working in absolute mode only).
761 Format: <msecs>
762 mousedev.xres= [MOUSE] Horizontal screen resolution, used for devices
763 reporting absolute coordinates, such as tablets
764 mousedev.yres= [MOUSE] Vertical screen resolution, used for devices
765 reporting absolute coordinates, such as tablets
766
767 mpu401= [HW,OSS]
768 Format: <io>,<irq>
769
770 MTD_Partition= [MTD]
771 Format: <name>,<region-number>,<size>,<offset>
772
773 MTD_Region= [MTD]
774 Format: <name>,<region-number>[,<base>,<size>,<buswidth>,<altbuswidth>]
775
776 mtdparts= [MTD]
777 See drivers/mtd/cmdline.c.
778
779 n2= [NET] SDL Inc. RISCom/N2 synchronous serial card
780
781 NCR_D700= [HW,SCSI]
782 See header of drivers/scsi/NCR_D700.c.
783
784 ncr5380= [HW,SCSI]
785
786 ncr53c400= [HW,SCSI]
787
788 ncr53c400a= [HW,SCSI]
789
790 ncr53c406a= [HW,SCSI]
791
792 ncr53c8xx= [HW,SCSI]
793
794 netdev= [NET] Network devices parameters
795 Format: <irq>,<io>,<mem_start>,<mem_end>,<name>
796 Note that mem_start is often overloaded to mean
797 something different and driver-specific.
798
799 nfsaddrs= [NFS]
800 See Documentation/nfsroot.txt.
801
802 nfsroot= [NFS] nfs root filesystem for disk-less boxes.
803 See Documentation/nfsroot.txt.
804
805 nmi_watchdog= [KNL,BUGS=IA-32] Debugging features for SMP kernels
806
807 no387 [BUGS=IA-32] Tells the kernel to use the 387 maths
808 emulation library even if a 387 maths coprocessor
809 is present.
810
811 noalign [KNL,ARM]
812
813 noapic [SMP,APIC] Tells the kernel to not make use of any
814 IOAPICs that may be present in the system.
815
816 noasync [HW,M68K] Disables async and sync negotiation for
817 all devices.
818
819 nobats [PPC] Do not use BATs for mapping kernel lowmem
820 on "Classic" PPC cores.
821
822 nocache [ARM]
823
824 nodisconnect [HW,SCSI,M68K] Disables SCSI disconnects.
825
826 noexec [IA-64]
827
828 noexec [i386, x86_64]
829 noexec=on: enable non-executable mappings (default)
830 noexec=off: disable nn-executable mappings
831
832 nofxsr [BUGS=IA-32]
833
834 nohlt [BUGS=ARM]
835
836 no-hlt [BUGS=IA-32] Tells the kernel that the hlt
837 instruction doesn't work correctly and not to
838 use it.
839
840 noirqdebug [IA-32] Disables the code which attempts to detect and
841 disable unhandled interrupt sources.
842
843 noisapnp [ISAPNP] Disables ISA PnP code.
844
845 noinitrd [RAM] Tells the kernel not to load any configured
846 initial RAM disk.
847
848 nointroute [IA-64]
849
850 nolapic [IA-32,APIC] Do not enable or use the local APIC.
851
852 noltlbs [PPC] Do not use large page/tlb entries for kernel
853 lowmem mapping on PPC40x.
854
855 nomce [IA-32] Machine Check Exception
856
857 noresidual [PPC] Don't use residual data on PReP machines.
858
859 noresume [SWSUSP] Disables resume and restore original swap space.
860
861 no-scroll [VGA] Disables scrollback.
862 This is required for the Braillex ib80-piezo Braille
863 reader made by F.H. Papenmeier (Germany).
864
865 nosbagart [IA-64]
866
867 nosmp [SMP] Tells an SMP kernel to act as a UP kernel.
868
869 nosync [HW,M68K] Disables sync negotiation for all devices.
870
871 notsc [BUGS=IA-32] Disable Time Stamp Counter
872
873 nousb [USB] Disable the USB subsystem
874
875 nowb [ARM]
876
877 opl3= [HW,OSS]
878 Format: <io>
879
880 opl3sa= [HW,OSS]
881 Format: <io>,<irq>,<dma>,<dma2>,<mpu_io>,<mpu_irq>
882
883 opl3sa2= [HW,OSS]
884 Format: <io>,<irq>,<dma>,<dma2>,<mss_io>,<mpu_io>,<ymode>,<loopback>[,<isapnp>,<multiple]
885
886 oprofile.timer= [HW]
887 Use timer interrupt instead of performance counters
888
889 optcd= [HW,CD]
890 Format: <io>
891
892 osst= [HW,SCSI] SCSI Tape Driver
893 Format: <buffer_size>,<write_threshold>
894 See also Documentation/scsi/st.txt.
895
896 panic= [KNL] Kernel behaviour on panic
897 Format: <timeout>
898
899 parkbd.port= [HW] Parallel port number the keyboard adapter is
900 connected to, default is 0.
901 Format: <parport#>
902 parkbd.mode= [HW] Parallel port keyboard adapter mode of operation,
903 0 for XT, 1 for AT (default is AT).
904 Format: <mode>
905
906 parport=0 [HW,PPT] Specify parallel ports. 0 disables.
907 parport=auto Use 'auto' to force the driver to use
908 parport=0xBBB[,IRQ[,DMA]] any IRQ/DMA settings detected (the
909 default is to ignore detected IRQ/DMA
910 settings because of possible
911 conflicts). You can specify the base
912 address, IRQ, and DMA settings; IRQ and
913 DMA should be numbers, or 'auto' (for
914 using detected settings on that
915 particular port), or 'nofifo' (to avoid
916 using a FIFO even if it is detected).
917 Parallel ports are assigned in the
918 order they are specified on the command
919 line, starting with parport0.
920
921 parport_init_mode=
922 [HW,PPT] Configure VIA parallel port to
923 operate in specific mode. This is
924 necessary on Pegasos computer where
925 firmware has no options for setting up
926 parallel port mode and sets it to
927 spp. Currently this function knows
928 686a and 8231 chips.
929 Format: [spp|ps2|epp|ecp|ecpepp]
930
931 pas2= [HW,OSS]
932 Format: <io>,<irq>,<dma>,<dma16>,<sb_io>,<sb_irq>,<sb_dma>,<sb_dma16>
933
934 pas16= [HW,SCSI]
935 See header of drivers/scsi/pas16.c.
936
937 pcbit= [HW,ISDN]
938
939 pcd. [PARIDE]
940 See header of drivers/block/paride/pcd.c.
941 See also Documentation/paride.txt.
942
943 pci=option[,option...] [PCI] various PCI subsystem options:
944 off [IA-32] don't probe for the PCI bus
945 bios [IA-32] force use of PCI BIOS, don't access
946 the hardware directly. Use this if your machine
947 has a non-standard PCI host bridge.
948 nobios [IA-32] disallow use of PCI BIOS, only direct
949 hardware access methods are allowed. Use this
950 if you experience crashes upon bootup and you
951 suspect they are caused by the BIOS.
952 conf1 [IA-32] Force use of PCI Configuration Mechanism 1.
953 conf2 [IA-32] Force use of PCI Configuration Mechanism 2.
954 nosort [IA-32] Don't sort PCI devices according to
955 order given by the PCI BIOS. This sorting is done
956 to get a device order compatible with older kernels.
957 biosirq [IA-32] Use PCI BIOS calls to get the interrupt
958 routing table. These calls are known to be buggy
959 on several machines and they hang the machine when used,
960 but on other computers it's the only way to get the
961 interrupt routing table. Try this option if the kernel
962 is unable to allocate IRQs or discover secondary PCI
963 buses on your motherboard.
964 rom [IA-32] Assign address space to expansion ROMs.
965 Use with caution as certain devices share address
966 decoders between ROMs and other resources.
967 irqmask=0xMMMM [IA-32] Set a bit mask of IRQs allowed to be assigned
968 automatically to PCI devices. You can make the kernel
969 exclude IRQs of your ISA cards this way.
970 lastbus=N [IA-32] Scan all buses till bus #N. Can be useful
971 if the kernel is unable to find your secondary buses
972 and you want to tell it explicitly which ones they are.
973 assign-busses [IA-32] Always assign all PCI bus
974 numbers ourselves, overriding
975 whatever the firmware may have
976 done.
977 usepirqmask [IA-32] Honor the possible IRQ mask
978 stored in the BIOS $PIR table. This is
979 needed on some systems with broken
980 BIOSes, notably some HP Pavilion N5400
981 and Omnibook XE3 notebooks. This will
982 have no effect if ACPI IRQ routing is
983 enabled.
984 noacpi [IA-32] Do not use ACPI for IRQ routing
985 or for PCI scanning.
986 routeirq Do IRQ routing for all PCI devices.
987 This is normally done in pci_enable_device(),
988 so this option is a temporary workaround
989 for broken drivers that don't call it.
990
991 firmware [ARM] Do not re-enumerate the bus but
992 instead just use the configuration
993 from the bootloader. This is currently
994 used on IXP2000 systems where the
995 bus has to be configured a certain way
996 for adjunct CPUs.
997
998 pcmv= [HW,PCMCIA] BadgePAD 4
999
1000 pd. [PARIDE]
1001 See Documentation/paride.txt.
1002
1003 pdcchassis= [PARISC,HW] Disable/Enable PDC Chassis Status codes at
1004 boot time.
1005 Format: { 0 | 1 }
1006 See arch/parisc/kernel/pdc_chassis.c
1007
1008 pf. [PARIDE]
1009 See Documentation/paride.txt.
1010
1011 pg. [PARIDE]
1012 See Documentation/paride.txt.
1013
1014 pirq= [SMP,APIC] Manual mp-table setup
1015 See Documentation/i386/IO-APIC.txt.
1016
1017 plip= [PPT,NET] Parallel port network link
1018 Format: { parport<nr> | timid | 0 }
1019 See also Documentation/parport.txt.
1020
1021 pnpacpi= [ACPI]
1022 { off }
1023
1024 pnpbios= [ISAPNP]
1025 { on | off | curr | res | no-curr | no-res }
1026
1027 pnp_reserve_irq=
1028 [ISAPNP] Exclude IRQs for the autoconfiguration
1029
1030 pnp_reserve_dma=
1031 [ISAPNP] Exclude DMAs for the autoconfiguration
1032
1033 pnp_reserve_io= [ISAPNP] Exclude I/O ports for the autoconfiguration
1034 Ranges are in pairs (I/O port base and size).
1035
1036 pnp_reserve_mem=
1037 [ISAPNP] Exclude memory regions for the autoconfiguration
1038 Ranges are in pairs (memory base and size).
1039
1040 profile= [KNL] Enable kernel profiling via /proc/profile
1041 { schedule | <number> }
1042 (param: schedule - profile schedule points}
1043 (param: profile step/bucket size as a power of 2 for
1044 statistical time based profiling)
1045
1046 processor.max_cstate= [HW, ACPI]
1047 Limit processor to maximum C-state
1048 max_cstate=9 overrides any DMI blacklist limit.
1049
1050 prompt_ramdisk= [RAM] List of RAM disks to prompt for floppy disk
1051 before loading.
1052 See Documentation/ramdisk.txt.
1053
1054 psmouse.proto= [HW,MOUSE] Highest PS2 mouse protocol extension to
1055 probe for (bare|imps|exps).
1056 psmouse.rate= [HW,MOUSE] Set desired mouse report rate, in reports
1057 per second.
1058 psmouse.resetafter=
1059 [HW,MOUSE] Try to reset the device after so many bad packets
1060 (0 = never).
1061 psmouse.resolution=
1062 [HW,MOUSE] Set desired mouse resolution, in dpi.
1063 psmouse.smartscroll=
1064 [HW,MOUSE] Controls Logitech smartscroll autorepeat,
1065 0 = disabled, 1 = enabled (default).
1066
1067 pss= [HW,OSS] Personal Sound System (ECHO ESC614)
1068 Format: <io>,<mss_io>,<mss_irq>,<mss_dma>,<mpu_io>,<mpu_irq>
1069
1070 pt. [PARIDE]
1071 See Documentation/paride.txt.
1072
1073 quiet= [KNL] Disable log messages
1074
1075 r128= [HW,DRM]
1076
1077 raid= [HW,RAID]
1078 See Documentation/md.txt.
1079
1080 ramdisk= [RAM] Sizes of RAM disks in kilobytes [deprecated]
1081 See Documentation/ramdisk.txt.
1082
1083 ramdisk_blocksize=
1084 [RAM]
1085 See Documentation/ramdisk.txt.
1086
1087 ramdisk_size= [RAM] Sizes of RAM disks in kilobytes
1088 New name for the ramdisk parameter.
1089 See Documentation/ramdisk.txt.
1090
1091 reboot= [BUGS=IA-32,BUGS=ARM,BUGS=IA-64] Rebooting mode
1092 Format: <reboot_mode>[,<reboot_mode2>[,...]]
1093 See arch/*/kernel/reboot.c.
1094
1095 reserve= [KNL,BUGS] Force the kernel to ignore some iomem area
1096
1097 resume= [SWSUSP] Specify the partition device for software suspension
1098
1099 rhash_entries= [KNL,NET]
1100 Set number of hash buckets for route cache
1101
1102 riscom8= [HW,SERIAL]
1103 Format: <io_board1>[,<io_board2>[,...<io_boardN>]]
1104
1105 ro [KNL] Mount root device read-only on boot
1106
1107 root= [KNL] Root filesystem
1108
1109 rootdelay= [KNL] Delay (in seconds) to pause before attempting to
1110 mount the root filesystem
1111
1112 rootflags= [KNL] Set root filesystem mount option string
1113
1114 rootfstype= [KNL] Set root filesystem type
1115
1116 rw [KNL] Mount root device read-write on boot
1117
1118 S [KNL] Run init in single mode
1119
1120 sa1100ir [NET]
1121 See drivers/net/irda/sa1100_ir.c.
1122
1123 sb= [HW,OSS]
1124 Format: <io>,<irq>,<dma>,<dma2>
1125
1126 sbni= [NET] Granch SBNI12 leased line adapter
1127
1128 sbpcd= [HW,CD] Soundblaster CD adapter
1129 Format: <io>,<type>
1130 See a comment before function sbpcd_setup() in
1131 drivers/cdrom/sbpcd.c.
1132
1133 sc1200wdt= [HW,WDT] SC1200 WDT (watchdog) driver
1134 Format: <io>[,<timeout>[,<isapnp>]]
1135
1136 scsi_debug_*= [SCSI]
1137 See drivers/scsi/scsi_debug.c.
1138
1139 scsi_default_dev_flags=
1140 [SCSI] SCSI default device flags
1141 Format: <integer>
1142
1143 scsi_dev_flags= [SCSI] Black/white list entry for vendor and model
1144 Format: <vendor>:<model>:<flags>
1145 (flags are integer value)
1146
1147 scsi_logging= [SCSI]
1148
1149 serialnumber [BUGS=IA-32]
1150
1151 sf16fm= [HW] SF16FMI radio driver for Linux
1152 Format: <io>
1153
1154 sg_def_reserved_size=
1155 [SCSI]
1156
1157 sgalaxy= [HW,OSS]
1158 Format: <io>,<irq>,<dma>,<dma2>,<sgbase>
1159
1160 shapers= [NET]
1161 Maximal number of shapers.
1162
1163 sim710= [SCSI,HW]
1164 See header of drivers/scsi/sim710.c.
1165
1166 simeth= [IA-64]
1167 simscsi=
1168
1169 sjcd= [HW,CD]
1170 Format: <io>,<irq>,<dma>
1171 See header of drivers/cdrom/sjcd.c.
1172
1173 slram= [HW,MTD]
1174
1175 smart2= [HW]
1176 Format: <io1>[,<io2>[,...,<io8>]]
1177
1178 snd-ad1816a= [HW,ALSA]
1179
1180 snd-ad1848= [HW,ALSA]
1181
1182 snd-ali5451= [HW,ALSA]
1183
1184 snd-als100= [HW,ALSA]
1185
1186 snd-als4000= [HW,ALSA]
1187
1188 snd-azt2320= [HW,ALSA]
1189
1190 snd-cmi8330= [HW,ALSA]
1191
1192 snd-cmipci= [HW,ALSA]
1193
1194 snd-cs4231= [HW,ALSA]
1195
1196 snd-cs4232= [HW,ALSA]
1197
1198 snd-cs4236= [HW,ALSA]
1199
1200 snd-cs4281= [HW,ALSA]
1201
1202 snd-cs46xx= [HW,ALSA]
1203
1204 snd-dt019x= [HW,ALSA]
1205
1206 snd-dummy= [HW,ALSA]
1207
1208 snd-emu10k1= [HW,ALSA]
1209
1210 snd-ens1370= [HW,ALSA]
1211
1212 snd-ens1371= [HW,ALSA]
1213
1214 snd-es968= [HW,ALSA]
1215
1216 snd-es1688= [HW,ALSA]
1217
1218 snd-es18xx= [HW,ALSA]
1219
1220 snd-es1938= [HW,ALSA]
1221
1222 snd-es1968= [HW,ALSA]
1223
1224 snd-fm801= [HW,ALSA]
1225
1226 snd-gusclassic= [HW,ALSA]
1227
1228 snd-gusextreme= [HW,ALSA]
1229
1230 snd-gusmax= [HW,ALSA]
1231
1232 snd-hdsp= [HW,ALSA]
1233
1234 snd-ice1712= [HW,ALSA]
1235
1236 snd-intel8x0= [HW,ALSA]
1237
1238 snd-interwave= [HW,ALSA]
1239
1240 snd-interwave-stb=
1241 [HW,ALSA]
1242
1243 snd-korg1212= [HW,ALSA]
1244
1245 snd-maestro3= [HW,ALSA]
1246
1247 snd-mpu401= [HW,ALSA]
1248
1249 snd-mtpav= [HW,ALSA]
1250
1251 snd-nm256= [HW,ALSA]
1252
1253 snd-opl3sa2= [HW,ALSA]
1254
1255 snd-opti92x-ad1848=
1256 [HW,ALSA]
1257
1258 snd-opti92x-cs4231=
1259 [HW,ALSA]
1260
1261 snd-opti93x= [HW,ALSA]
1262
1263 snd-pmac= [HW,ALSA]
1264
1265 snd-rme32= [HW,ALSA]
1266
1267 snd-rme96= [HW,ALSA]
1268
1269 snd-rme9652= [HW,ALSA]
1270
1271 snd-sb8= [HW,ALSA]
1272
1273 snd-sb16= [HW,ALSA]
1274
1275 snd-sbawe= [HW,ALSA]
1276
1277 snd-serial= [HW,ALSA]
1278
1279 snd-sgalaxy= [HW,ALSA]
1280
1281 snd-sonicvibes= [HW,ALSA]
1282
1283 snd-sun-amd7930=
1284 [HW,ALSA]
1285
1286 snd-sun-cs4231= [HW,ALSA]
1287
1288 snd-trident= [HW,ALSA]
1289
1290 snd-usb-audio= [HW,ALSA,USB]
1291
1292 snd-via82xx= [HW,ALSA]
1293
1294 snd-virmidi= [HW,ALSA]
1295
1296 snd-wavefront= [HW,ALSA]
1297
1298 snd-ymfpci= [HW,ALSA]
1299
1300 sonicvibes= [HW,OSS]
1301 Format: <reverb>
1302
1303 sonycd535= [HW,CD]
1304 Format: <io>[,<irq>]
1305
1306 sonypi.*= [HW] Sony Programmable I/O Control Device driver
1307 See Documentation/sonypi.txt
1308
1309 specialix= [HW,SERIAL] Specialix multi-serial port adapter
1310 See Documentation/specialix.txt.
1311
1312 spia_io_base= [HW,MTD]
1313 spia_fio_base=
1314 spia_pedr=
1315 spia_peddr=
1316
1317 sscape= [HW,OSS]
1318 Format: <io>,<irq>,<dma>,<mpu_io>,<mpu_irq>
1319
1320 st= [HW,SCSI] SCSI tape parameters (buffers, etc.)
1321 See Documentation/scsi/st.txt.
1322
1323 st0x= [HW,SCSI]
1324 See header of drivers/scsi/seagate.c.
1325
1326 sti= [PARISC,HW]
1327 Format: <num>
1328 Set the STI (builtin display/keyboard on the HP-PARISC
1329 machines) console (graphic card) which should be used
1330 as the initial boot-console.
1331 See also comment in drivers/video/console/sticore.c.
1332
1333 sti_font= [HW]
1334 See comment in drivers/video/console/sticore.c.
1335
1336 stifb= [HW]
1337 Format: bpp:<bpp1>[:<bpp2>[:<bpp3>...]]
1338
1339 stram_swap= [HW,M68k]
1340
1341 swiotlb= [IA-64] Number of I/O TLB slabs
1342
1343 switches= [HW,M68k]
1344
1345 sym53c416= [HW,SCSI]
1346 See header of drivers/scsi/sym53c416.c.
1347
1348 sym53c8xx= [HW,SCSI]
1349 See Documentation/scsi/ncr53c8xx.txt.
1350
1351 t128= [HW,SCSI]
1352 See header of drivers/scsi/t128.c.
1353
1354 tdfx= [HW,DRM]
1355
1356 thash_entries= [KNL,NET]
1357 Set number of hash buckets for TCP connection
1358
1359 tipar.timeout= [HW,PPT]
1360 Set communications timeout in tenths of a second
1361 (default 15).
1362
1363 tipar.delay= [HW,PPT]
1364 Set inter-bit delay in microseconds (default 10).
1365
1366 tmc8xx= [HW,SCSI]
1367 See header of drivers/scsi/seagate.c.
1368
1369 tmscsim= [HW,SCSI]
1370 See comment before function dc390_setup() in
1371 drivers/scsi/tmscsim.c.
1372
1373 tp720= [HW,PS2]
1374
1375 trix= [HW,OSS] MediaTrix AudioTrix Pro
1376 Format: <io>,<irq>,<dma>,<dma2>,<sb_io>,<sb_irq>,<sb_dma>,<mpu_io>,<mpu_irq>
1377
1378 tsdev.xres= [TS] Horizontal screen resolution.
1379 tsdev.yres= [TS] Vertical screen resolution.
1380
1381 turbografx.map[2|3]=
1382 [HW,JOY] TurboGraFX parallel port interface
1383 Format: <port#>,<js1>,<js2>,<js3>,<js4>,<js5>,<js6>,<js7>
1384 See also Documentation/input/joystick-parport.txt
1385
1386 u14-34f= [HW,SCSI] UltraStor 14F/34F SCSI host adapter
1387 See header of drivers/scsi/u14-34f.c.
1388
1389 uart401= [HW,OSS]
1390 Format: <io>,<irq>
1391
1392 uart6850= [HW,OSS]
1393 Format: <io>,<irq>
1394
1395 usb-handoff [HW] Enable early USB BIOS -> OS handoff
1396
1397 video= [FB] Frame buffer configuration
1398 See Documentation/fb/modedb.txt.
1399
1400 vga= [BOOT,IA-32] Select a particular video mode
1401 See Documentation/i386/boot.txt and Documentation/svga.txt.
1402 Use vga=ask for menu.
1403 This is actually a boot loader parameter; the value is
1404 passed to the kernel using a special protocol.
1405
1406 vmalloc=nn[KMG] [KNL,BOOT] forces the vmalloc area to have an exact
1407 size of <nn>. This can be used to increase the
1408 minimum size (128MB on x86). It can also be used to
1409 decrease the size and leave more room for directly
1410 mapped kernel RAM.
1411
1412 vmhalt= [KNL,S390]
1413
1414 vmpoff= [KNL,S390]
1415
1416 waveartist= [HW,OSS]
1417 Format: <io>,<irq>,<dma>,<dma2>
1418
1419 wd33c93= [HW,SCSI]
1420 See header of drivers/scsi/wd33c93.c.
1421
1422 wd7000= [HW,SCSI]
1423 See header of drivers/scsi/wd7000.c.
1424
1425 wdt= [WDT] Watchdog
1426 See Documentation/watchdog/watchdog.txt.
1427
1428 xd= [HW,XT] Original XT pre-IDE (RLL encoded) disks.
1429 xd_geo= See header of drivers/block/xd.c.
1430
1431 xirc2ps_cs= [NET,PCMCIA]
1432 Format: <irq>,<irq_mask>,<io>,<full_duplex>,<do_sound>,<lockup_hack>[,<irq2>[,<irq3>[,<irq4>]]]
1433
1434
1435
1436 Changelog:
1437
1438 The last known update (for 2.4.0) - the changelog was not kept before.
1439 2000-06-?? Mr. Unknown
1440
1441 Update for 2.5.49, description for most of the options introduced,
1442 references to other documentation (C files, READMEs, ..), added S390,
1443 PPC, SPARC, MTD, ALSA and OSS category. Minor corrections and
1444 reformatting.
1445 2002-11-24 Petr Baudis <pasky@ucw.cz>
1446 Randy Dunlap <randy.dunlap@verizon.net>
1447
1448 TODO:
1449
1450 Add documentation for ALSA options.
1451 Add more DRM drivers.
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