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[PATCH] kexec: x86_64: add CONFIG_PHYSICAL_START
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / Documentation / kernel-parameters.txt
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1da177e4
LT		 1February 2003 Kernel Parameters v2.5.59
2 ~~~~~~~~~~~~~~~~~
3
4The 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
7case insensitive manner), and with descriptions where known.
8
9Module parameters for loadable modules are specified only as the
10parameter name with optional '=' and value as appropriate, such as:
11
12 modprobe usbcore blinkenlights=1
13
14Module parameters for modules that are built into the kernel image
15are 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
20The text in square brackets at the beginning of the description state the
21restrictions on the kernel for the said kernel parameter to be valid. The
22restrictions 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 SELINUX SELinux support is enabled.
71 SERIAL Serial support is enabled.
72 SMP The kernel is an SMP kernel.
73 SPARC Sparc architecture is enabled.
74 SWSUSP Software suspension is enabled.
75 TS Appropriate touchscreen support is enabled.
76 USB USB support is enabled.
77 USBHID USB Human Interface Device support is enabled.
78 V4L Video For Linux support is enabled.
79 VGA The VGA console has been enabled.
80 VT Virtual terminal support is enabled.
81 WDT Watchdog support is enabled.
82 XT IBM PC/XT MFM hard disk support is enabled.
83 X86-64 X86-64 architecture is enabled.
84 More X86-64 boot options can be found in
85 Documentation/x86_64/boot-options.txt .
86
87In addition, the following text indicates that the option:
88
89 BUGS= Relates to possible processor bugs on the said processor.
90 KNL Is a kernel start-up parameter.
91 BOOT Is a boot loader parameter.
92
93Parameters denoted with BOOT are actually interpreted by the boot
94loader, and have no meaning to the kernel directly.
95Do not modify the syntax of boot loader parameters without extreme
96need or coordination with <Documentation/i386/boot.txt>.
97
98Note that ALL kernel parameters listed below are CASE SENSITIVE, and that
99a trailing = on the name of any parameter states that that parameter will
100be entered as an environment variable, whereas its absence indicates that
101it will appear as a kernel argument readable via /proc/cmdline by programs
102running once the system is up.
103
104 53c7xx= [HW,SCSI] Amiga SCSI controllers
105 See header of drivers/scsi/53c7xx.c.
106 See also Documentation/scsi/ncr53c7xx.txt.
107
108 acpi= [HW,ACPI] Advanced Configuration and Power Interface
109 Format: { force | off | ht | strict }
110 force -- enable ACPI if default was off
111 off -- disable ACPI if default was on
112 noirq -- do not use ACPI for IRQ routing
113 ht -- run only enough ACPI to enable Hyper Threading
114 strict -- Be less tolerant of platforms that are not
115 strictly ACPI specification compliant.
116
117 See also Documentation/pm.txt, pci=noacpi
118
119 acpi_sleep= [HW,ACPI] Sleep options
120 Format: { s3_bios, s3_mode }
121 See Documentation/power/video.txt
122
123 acpi_sci= [HW,ACPI] ACPI System Control Interrupt trigger mode
124 Format: { level | edge | high | low }
125
126 acpi_irq_balance [HW,ACPI] ACPI will balance active IRQs
127 default in APIC mode
128
129 acpi_irq_nobalance [HW,ACPI] ACPI will not move active IRQs (default)
130 default in PIC mode
131
132 acpi_irq_pci= [HW,ACPI] If irq_balance, Clear listed IRQs for use by PCI
133 Format: <irq>,<irq>...
134
135 acpi_irq_isa= [HW,ACPI] If irq_balance, Mark listed IRQs used by ISA
136 Format: <irq>,<irq>...
137
138 acpi_osi= [HW,ACPI] empty param disables _OSI
139
140 acpi_serialize [HW,ACPI] force serialization of AML methods
141
142 acpi_skip_timer_override [HW,ACPI]
143 Recognize and ignore IRQ0/pin2 Interrupt Override.
144 For broken nForce2 BIOS resulting in XT-PIC timer.
145
146 acpi_dbg_layer= [HW,ACPI]
147 Format: <int>
148 Each bit of the <int> indicates an acpi debug layer,
149 1: enable, 0: disable. It is useful for boot time
150 debugging. After system has booted up, it can be set
151 via /proc/acpi/debug_layer.
152
153 acpi_dbg_level= [HW,ACPI]
154 Format: <int>
155 Each bit of the <int> indicates an acpi debug level,
156 1: enable, 0: disable. It is useful for boot time
157 debugging. After system has booted up, it can be set
158 via /proc/acpi/debug_level.
159
160 acpi_fake_ecdt [HW,ACPI] Workaround failure due to BIOS lacking ECDT
161
162 ad1816= [HW,OSS]
163 Format: <io>,<irq>,<dma>,<dma2>
164 See also Documentation/sound/oss/AD1816.
165
166 ad1848= [HW,OSS]
167 Format: <io>,<irq>,<dma>,<dma2>,<type>
168
169 adlib= [HW,OSS]
170 Format: <io>
171
172 advansys= [HW,SCSI]
173 See header of drivers/scsi/advansys.c.
174
175 advwdt= [HW,WDT] Advantech WDT
176 Format: <iostart>,<iostop>
177
178 aedsp16= [HW,OSS] Audio Excel DSP 16
179 Format: <io>,<irq>,<dma>,<mss_io>,<mpu_io>,<mpu_irq>
180 See also header of sound/oss/aedsp16.c.
181
182 aha152x= [HW,SCSI]
183 See Documentation/scsi/aha152x.txt.
184
185 aha1542= [HW,SCSI]
186 Format: <portbase>[,<buson>,<busoff>[,<dmaspeed>]]
187
188 aic7xxx= [HW,SCSI]
189 See Documentation/scsi/aic7xxx.txt.
190
191 aic79xx= [HW,SCSI]
192 See Documentation/scsi/aic79xx.txt.
193
194 AM53C974= [HW,SCSI]
195 Format: <host-scsi-id>,<target-scsi-id>,<max-rate>,<max-offset>
196 See also header of drivers/scsi/AM53C974.c.
197
198 amijoy.map= [HW,JOY] Amiga joystick support
199 Map of devices attached to JOY0DAT and JOY1DAT
200 Format: <a>,<b>
201 See also Documentation/kernel/input/joystick.txt
202
203 analog.map= [HW,JOY] Analog joystick and gamepad support
204 Specifies type or capabilities of an analog joystick
205 connected to one of 16 gameports
206 Format: <type1>,<type2>,..<type16>
207
208 apc= [HW,SPARC] Power management functions (SPARCstation-4/5 + deriv.)
209 Format: noidle
210 Disable APC CPU standby support. SPARCstation-Fox does
211 not play well with APC CPU idle - disable it if you have
212 APC and your system crashes randomly.
213
214 apic= [APIC,i386] Change the output verbosity whilst booting
215 Format: { quiet (default) | verbose | debug }
216 Change the amount of debugging information output
217 when initialising the APIC and IO-APIC components.
218
219 apm= [APM] Advanced Power Management
220 See header of arch/i386/kernel/apm.c.
221
222 applicom= [HW]
223 Format: <mem>,<irq>
224
225 arcrimi= [HW,NET] ARCnet - "RIM I" (entirely mem-mapped) cards
226 Format: <io>,<irq>,<nodeID>
227
228 ataflop= [HW,M68k]
229
230 atarimouse= [HW,MOUSE] Atari Mouse
231
232 atascsi= [HW,SCSI] Atari SCSI
233
234 atkbd.extra= [HW] Enable extra LEDs and keys on IBM RapidAccess,
235 EzKey and similar keyboards
236
237 atkbd.reset= [HW] Reset keyboard during initialization
238
239 atkbd.set= [HW] Select keyboard code set
240 Format: <int> (2 = AT (default) 3 = PS/2)
241
242 atkbd.scroll= [HW] Enable scroll wheel on MS Office and similar
243 keyboards
244
245 atkbd.softraw= [HW] Choose between synthetic and real raw mode
246 Format: <bool> (0 = real, 1 = synthetic (default))
247
248 atkbd.softrepeat=
249 [HW] Use software keyboard repeat
250
251 autotest [IA64]
252
253 awe= [HW,OSS] AWE32/SB32/AWE64 wave table synth
254 Format: <io>,<memsize>,<isapnp>
255
256 aztcd= [HW,CD] Aztech CD268 CDROM driver
257 Format: <io>,0x79 (?)
258
259 baycom_epp= [HW,AX25]
260 Format: <io>,<mode>
261
262 baycom_par= [HW,AX25] BayCom Parallel Port AX.25 Modem
263 Format: <io>,<mode>
264 See header of drivers/net/hamradio/baycom_par.c.
265
266 baycom_ser_fdx= [HW,AX25] BayCom Serial Port AX.25 Modem (Full Duplex Mode)
267 Format: <io>,<irq>,<mode>[,<baud>]
268 See header of drivers/net/hamradio/baycom_ser_fdx.c.
269
270 baycom_ser_hdx= [HW,AX25] BayCom Serial Port AX.25 Modem (Half Duplex Mode)
271 Format: <io>,<irq>,<mode>
272 See header of drivers/net/hamradio/baycom_ser_hdx.c.
273
274 blkmtd_device= [HW,MTD]
275 blkmtd_erasesz=
276 blkmtd_ro=
277 blkmtd_bs=
278 blkmtd_count=
279
280 bttv.card= [HW,V4L] bttv (bt848 + bt878 based grabber cards)
281 bttv.radio= Most important insmod options are available as kernel args too.
282 bttv.pll= See Documentation/video4linux/bttv/Insmod-options
283 bttv.tuner= and Documentation/video4linux/bttv/CARDLIST
284
285 BusLogic= [HW,SCSI]
286 See drivers/scsi/BusLogic.c, comment before function
287 BusLogic_ParseDriverOptions().
288
289 c101= [NET] Moxa C101 synchronous serial card
290
291 cachesize= [BUGS=IA-32] Override level 2 CPU cache size detection.
292 Sometimes CPU hardware bugs make them report the cache
293 size incorrectly. The kernel will attempt work arounds
294 to fix known problems, but for some CPUs it is not
295 possible to determine what the correct size should be.
296 This option provides an override for these situations.
297
298 cdu31a= [HW,CD]
299 Format: <io>,<irq>[,PAS]
300 See header of drivers/cdrom/cdu31a.c.
301
302 chandev= [HW,NET] Generic channel device initialisation
303
304 checkreqprot [SELINUX] Set initial checkreqprot flag value.
305 Format: { "0" | "1" }
306 See security/selinux/Kconfig help text.
307 0 -- check protection applied by kernel (includes any implied execute protection).
308 1 -- check protection requested by application.
309 Default value is set via a kernel config option.
310 Value can be changed at runtime via /selinux/checkreqprot.
311
312 clock= [BUGS=IA-32, HW] gettimeofday timesource override.
313 Forces specified timesource (if avaliable) to be used
314 when calculating gettimeofday(). If specicified timesource
315 is not avalible, it defaults to PIT.
316 Format: { pit | tsc | cyclone | pmtmr }
317
318 hpet= [IA-32,HPET] option to disable HPET and use PIT.
319 Format: disable
320
321 cm206= [HW,CD]
322 Format: { auto | [<io>,][<irq>] }
323
324 com20020= [HW,NET] ARCnet - COM20020 chipset
325 Format: <io>[,<irq>[,<nodeID>[,<backplane>[,<ckp>[,<timeout>]]]]]
326
327 com90io= [HW,NET] ARCnet - COM90xx chipset (IO-mapped buffers)
328 Format: <io>[,<irq>]
329
330 com90xx= [HW,NET] ARCnet - COM90xx chipset (memory-mapped buffers)
331 Format: <io>[,<irq>[,<memstart>]]
332
333 condev= [HW,S390] console device
334 conmode=
335
336 console= [KNL] Output console device and options.
337
338 tty<n> Use the virtual console device <n>.
339
340 ttyS<n>[,options]
341 Use the specified serial port. The options are of
342 the form "bbbbpn", where "bbbb" is the baud rate,
343 "p" is parity ("n", "o", or "e"), and "n" is bits.
344 Default is "9600n8".
345
346 See also Documentation/serial-console.txt.
347
348 uart,io,<addr>[,options]
349 uart,mmio,<addr>[,options]
350 Start an early, polled-mode console on the 8250/16550
351 UART at the specified I/O port or MMIO address,
352 switching to the matching ttyS device later. The
353 options are the same as for ttyS, above.
354
355 cpcihp_generic= [HW,PCI] Generic port I/O CompactPCI driver
356 Format: <first_slot>,<last_slot>,<port>,<enum_bit>[,<debug>]
357
358 cpia_pp= [HW,PPT]
359 Format: { parport<nr> | auto | none }
360
361 cs4232= [HW,OSS]
362 Format: <io>,<irq>,<dma>,<dma2>,<mpuio>,<mpuirq>
363
364 cs89x0_dma= [HW,NET]
365 Format: <dma>
366
367 cs89x0_media= [HW,NET]
368 Format: { rj45 | aui | bnc }
369
370 cyclades= [HW,SERIAL] Cyclades multi-serial port adapter.
371
372 dasd= [HW,NET]
373 See header of drivers/s390/block/dasd_devmap.c.
374
375 db9.dev[2|3]= [HW,JOY] Multisystem joystick support via parallel port
376 (one device per port)
377 Format: <port#>,<type>
378 See also Documentation/input/joystick-parport.txt
379
380 debug [KNL] Enable kernel debugging (events log level).
381
382 decnet= [HW,NET]
383 Format: <area>[,<node>]
384 See also Documentation/networking/decnet.txt.
385
386 devfs= [DEVFS]
387 See Documentation/filesystems/devfs/boot-options.
388
389 dhash_entries= [KNL]
390 Set number of hash buckets for dentry cache.
391
392 digi= [HW,SERIAL]
393 IO parameters + enable/disable command.
394
395 digiepca= [HW,SERIAL]
396 See drivers/char/README.epca and
397 Documentation/digiepca.txt.
398
399 dmascc= [HW,AX25,SERIAL] AX.25 Z80SCC driver with DMA
400 support available.
401 Format: <io_dev0>[,<io_dev1>[,..<io_dev32>]]
402
403 dmasound= [HW,OSS] Sound subsystem buffers
404
405 dscc4.setup= [NET]
406
407 dtc3181e= [HW,SCSI]
408
409 earlyprintk= [IA-32, X86-64]
410 earlyprintk=vga
411 earlyprintk=serial[,ttySn[,baudrate]]
412
413 Append ,keep to not disable it when the real console
414 takes over.
415
416 Only vga or serial at a time, not both.
417
418 Currently only ttyS0 and ttyS1 are supported.
419
420 Interaction with the standard serial driver is not
421 very good.
422
423 The VGA output is eventually overwritten by the real
424 console.
425
426 eata= [HW,SCSI]
427
428 eda= [HW,PS2]
429
430 edb= [HW,PS2]
431
432 edd= [EDD]
433 Format: {"of[f]" | "sk[ipmbr]"}
434 See comment in arch/i386/boot/edd.S
435
436 eicon= [HW,ISDN]
437 Format: <id>,<membase>,<irq>
438
439 eisa_irq_edge= [PARISC,HW]
440 See header of drivers/parisc/eisa.c.
441
442 elanfreq= [IA-32]
443 See comment before function elanfreq_setup() in
444 arch/i386/kernel/cpu/cpufreq/elanfreq.c.
445
446 elevator= [IOSCHED]
447 Format: {"as"|"cfq"|"deadline"|"noop"}
448 See Documentation/block/as-iosched.txt
449 and Documentation/block/deadline-iosched.txt for details.
450
451 enforcing [SELINUX] Set initial enforcing status.
452 Format: {"0" | "1"}
453 See security/selinux/Kconfig help text.
454 0 -- permissive (log only, no denials).
455 1 -- enforcing (deny and log).
456 Default value is 0.
457 Value can be changed at runtime via /selinux/enforce.
458
459 es1370= [HW,OSS]
460 Format: <lineout>[,<micbias>]
461 See also header of sound/oss/es1370.c.
462
463 es1371= [HW,OSS]
464 Format: <spdif>,[<nomix>,[<amplifier>]]
465 See also header of sound/oss/es1371.c.
466
467 ether= [HW,NET] Ethernet cards parameters
468 This option is obsoleted by the "netdev=" option, which
469 has equivalent usage. See its documentation for details.
470
471 eurwdt= [HW,WDT] Eurotech CPU-1220/1410 onboard watchdog.
472 Format: <io>[,<irq>]
473
474 fd_mcs= [HW,SCSI]
475 See header of drivers/scsi/fd_mcs.c.
476
477 fdomain= [HW,SCSI]
478 See header of drivers/scsi/fdomain.c.
479
480 floppy= [HW]
481 See Documentation/floppy.txt.
482
483 ftape= [HW] Floppy Tape subsystem debugging options.
484 See Documentation/ftape.txt.
485
486 gamecon.map[2|3]=
487 [HW,JOY] Multisystem joystick and NES/SNES/PSX pad
488 support via parallel port (up to 5 devices per port)
489 Format: <port#>,<pad1>,<pad2>,<pad3>,<pad4>,<pad5>
490 See also Documentation/input/joystick-parport.txt
491
492 gamma= [HW,DRM]
493
494 gdth= [HW,SCSI]
495 See header of drivers/scsi/gdth.c.
496
497 gpt [EFI] Forces disk with valid GPT signature but
498 invalid Protective MBR to be treated as GPT.
499
500 gscd= [HW,CD]
501 Format: <io>
502
503 gt96100eth= [NET] MIPS GT96100 Advanced Communication Controller
504
505 gus= [HW,OSS]
506 Format: <io>,<irq>,<dma>,<dma16>
507
508 gvp11= [HW,SCSI]
509
510 hashdist= [KNL,NUMA] Large hashes allocated during boot
511 are distributed across NUMA nodes. Defaults on
512 for IA-64, off otherwise.
513
514 hcl= [IA-64] SGI's Hardware Graph compatibility layer
515
516 hd= [EIDE] (E)IDE hard drive subsystem geometry
517 Format: <cyl>,<head>,<sect>
518
519 hd?= [HW] (E)IDE subsystem
520 hd?lun= See Documentation/ide.txt.
521
522 highmem=nn[KMG] [KNL,BOOT] forces the highmem zone to have an exact
523 size of <nn>. This works even on boxes that have no
524 highmem otherwise. This also works to reduce highmem
525 size on bigger boxes.
526
527 hisax= [HW,ISDN]
528 See Documentation/isdn/README.HiSax.
529
530 hugepages= [HW,IA-32,IA-64] Maximal number of HugeTLB pages.
531
532 noirqbalance [IA-32,SMP,KNL] Disable kernel irq balancing
533
534 i8042.direct [HW] Put keyboard port into non-translated mode
535 i8042.dumbkbd [HW] Pretend that controlled can only read data from
536 keyboard and can not control its state
537 (Don't attempt to blink the leds)
538 i8042.noaux [HW] Don't check for auxiliary (== mouse) port
539 i8042.nomux [HW] Don't check presence of an active multiplexing
540 controller
541 i8042.nopnp [HW] Don't use ACPIPnP / PnPBIOS to discover KBD/AUX
542 controllers
543 i8042.panicblink=
544 [HW] Frequency with which keyboard LEDs should blink
545 when kernel panics (default is 0.5 sec)
546 i8042.reset [HW] Reset the controller during init and cleanup
547 i8042.unlock [HW] Unlock (ignore) the keylock
548
549 i810= [HW,DRM]
550
e70c9d5e
DT		 551 i8k.ignore_dmi [HW] Continue probing hardware even if DMI data
552 indicates that the driver is running on unsupported
553 hardware.
1da177e4
LT		 554 i8k.force [HW] Activate i8k driver even if SMM BIOS signature
555 does not match list of supported models.
556 i8k.power_status
557 [HW] Report power status in /proc/i8k
558 (disabled by default)
559 i8k.restricted [HW] Allow controlling fans only if SYS_ADMIN
560 capability is set.
561
562 ibmmcascsi= [HW,MCA,SCSI] IBM MicroChannel SCSI adapter
563 See Documentation/mca.txt.
564
565 icn= [HW,ISDN]
566 Format: <io>[,<membase>[,<icn_id>[,<icn_id2>]]]
567
568 ide= [HW] (E)IDE subsystem
569 Format: ide=nodma or ide=doubler or ide=reverse
570 See Documentation/ide.txt.
571
572 ide?= [HW] (E)IDE subsystem
573 Format: ide?=noprobe or chipset specific parameters.
574 See Documentation/ide.txt.
575
576 idebus= [HW] (E)IDE subsystem - VLB/PCI bus speed
577 See Documentation/ide.txt.
578
579 idle= [HW]
580 Format: idle=poll or idle=halt
581
582 ihash_entries= [KNL]
583 Set number of hash buckets for inode cache.
584
585 in2000= [HW,SCSI]
586 See header of drivers/scsi/in2000.c.
587
588 init= [KNL]
589 Format: <full_path>
590 Run specified binary instead of /sbin/init as init
591 process.
592
593 initcall_debug [KNL] Trace initcalls as they are executed. Useful
594 for working out where the kernel is dying during
595 startup.
596
597 initrd= [BOOT] Specify the location of the initial ramdisk
598
599 inport.irq= [HW] Inport (ATI XL and Microsoft) busmouse driver
600 Format: <irq>
601
602 inttest= [IA64]
603
604 io7= [HW] IO7 for Marvel based alpha systems
605 See comment before marvel_specify_io7 in
606 arch/alpha/kernel/core_marvel.c.
607
608 ip= [IP_PNP]
609 See Documentation/nfsroot.txt.
610
611 ip2= [HW] Set IO/IRQ pairs for up to 4 IntelliPort boards
612 See comment before ip2_setup() in drivers/char/ip2.c.
613
614 ips= [HW,SCSI] Adaptec / IBM ServeRAID controller
615 See header of drivers/scsi/ips.c.
616
617 isapnp= [ISAPNP]
618 Format: <RDP>, <reset>, <pci_scan>, <verbosity>
619
620 isolcpus= [KNL,SMP] Isolate CPUs from the general scheduler.
621 Format: <cpu number>,...,<cpu number>
622 This option can be used to specify one or more CPUs
623 to isolate from the general SMP balancing and scheduling
624 algorithms. The only way to move a process onto or off
625 an "isolated" CPU is via the CPU affinity syscalls.
626 <cpu number> begins at 0 and the maximum value is
627 "number of CPUs in system - 1".
628
629 This option is the preferred way to isolate CPUs. The
630 alternative - manually setting the CPU mask of all tasks
631 in the system can cause problems and suboptimal load
632 balancer performance.
633
634 isp16= [HW,CD]
635 Format: <io>,<irq>,<dma>,<setup>
636
637 iucv= [HW,NET]
638
639 js= [HW,JOY] Analog joystick
640 See Documentation/input/joystick.txt.
641
642 keepinitrd [HW,ARM]
643
644 kstack=N [IA-32, X86-64] Print N words from the kernel stack
645 in oops dumps.
646
647 l2cr= [PPC]
648
649 lapic [IA-32,APIC] Enable the local APIC even if BIOS disabled it.
650
651 lasi= [HW,SCSI] PARISC LASI driver for the 53c700 chip
652 Format: addr:<io>,irq:<irq>
653
654 llsc*= [IA64]
655 See function print_params() in arch/ia64/sn/kernel/llsc4.c.
656
657 load_ramdisk= [RAM] List of ramdisks to load from floppy
658 See Documentation/ramdisk.txt.
659
660 lockd.udpport= [NFS]
661
662 lockd.tcpport= [NFS]
663
664 logibm.irq= [HW,MOUSE] Logitech Bus Mouse Driver
665 Format: <irq>
666
667 loglevel= All Kernel Messages with a loglevel smaller than the
668 console loglevel will be printed to the console. It can
669 also be changed with klogd or other programs. The
670 loglevels are defined as follows:
671
672 0 (KERN_EMERG) system is unusable
673 1 (KERN_ALERT) action must be taken immediately
674 2 (KERN_CRIT) critical conditions
675 3 (KERN_ERR) error conditions
676 4 (KERN_WARNING) warning conditions
677 5 (KERN_NOTICE) normal but significant condition
678 6 (KERN_INFO) informational
679 7 (KERN_DEBUG) debug-level messages
680
681 log_buf_len=n Sets the size of the printk ring buffer, in bytes.
682 Format is n, nk, nM. n must be a power of two. The
683 default is set in kernel config.
684
685 lp=0 [LP] Specify parallel ports to use, e.g,
686 lp=port[,port...] lp=none,parport0 (lp0 not configured, lp1 uses
687 lp=reset first parallel port). 'lp=0' disables the
688 lp=auto printer driver. 'lp=reset' (which can be
689 specified in addition to the ports) causes
690 attached printers to be reset. Using
691 lp=port1,port2,... specifies the parallel ports
692 to associate lp devices with, starting with
693 lp0. A port specification may be 'none' to skip
694 that lp device, or a parport name such as
695 'parport0'. Specifying 'lp=auto' instead of a
696 port specification list means that device IDs
697 from each port should be examined, to see if
698 an IEEE 1284-compliant printer is attached; if
699 so, the driver will manage that printer.
700 See also header of drivers/char/lp.c.
701
702 lpj=n [KNL]
703 Sets loops_per_jiffy to given constant, thus avoiding
704 time-consuming boot-time autodetection (up to 250 ms per
705 CPU). 0 enables autodetection (default). To determine
706 the correct value for your kernel, boot with normal
707 autodetection and see what value is printed. Note that
708 on SMP systems the preset will be applied to all CPUs,
709 which is likely to cause problems if your CPUs need
710 significantly divergent settings. An incorrect value
711 will cause delays in the kernel to be wrong, leading to
712 unpredictable I/O errors and other breakage. Although
713 unlikely, in the extreme case this might damage your
714 hardware.
715
716 ltpc= [NET]
717 Format: <io>,<irq>,<dma>
718
719 mac5380= [HW,SCSI]
720 Format: <can_queue>,<cmd_per_lun>,<sg_tablesize>,<hostid>,<use_tags>
721
722 mac53c9x= [HW,SCSI]
723 Format: <num_esps>,<disconnect>,<nosync>,<can_queue>,<cmd_per_lun>,<sg_tablesize>,<hostid>,<use_tags>
724
725 machvec= [IA64]
726 Force the use of a particular machine-vector (machvec) in a generic
727 kernel. Example: machvec=hpzx1_swiotlb
728
729 mad16= [HW,OSS]
730 Format: <io>,<irq>,<dma>,<dma16>,<mpu_io>,<mpu_irq>,<joystick>
731
732 maui= [HW,OSS]
733 Format: <io>,<irq>
734
735 max_loop= [LOOP] Maximum number of loopback devices that can
736 be mounted
737 Format: <1-256>
738
739 maxcpus= [SMP] Maximum number of processors that an SMP kernel
740 should make use of
741
742 max_luns= [SCSI] Maximum number of LUNs to probe
743 Should be between 1 and 2^32-1.
744
745 max_report_luns=
746 [SCSI] Maximum number of LUNs received
747 Should be between 1 and 16384.
748
749 mca-pentium [BUGS=IA-32]
750
751 mcatest= [IA-64]
752
753 mcd= [HW,CD]
754 Format: <port>,<irq>,<mitsumi_bug_93_wait>
755
756 mcdx= [HW,CD]
757
758 mce [IA-32] Machine Check Exception
759
760 md= [HW] RAID subsystems devices and level
761 See Documentation/md.txt.
762
763 mdacon= [MDA]
764 Format: <first>,<last>
765 Specifies range of consoles to be captured by the MDA.
766
767 mem=nn[KMG] [KNL,BOOT] Force usage of a specific amount of memory
768 Amount of memory to be used when the kernel is not able
769 to see the whole system memory or for test.
770 [IA-32] Use together with memmap= to avoid physical
771 address space collisions. Without memmap= PCI devices
772 could be placed at addresses belonging to unused RAM.
773
774 mem=nopentium [BUGS=IA-32] Disable usage of 4MB pages for kernel
775 memory.
776
777 memmap=exactmap [KNL,IA-32] Enable setting of an exact
778 E820 memory map, as specified by the user.
779 Such memmap=exactmap lines can be constructed based on
780 BIOS output or other requirements. See the memmap=nn@ss
781 option description.
782
783 memmap=nn[KMG]@ss[KMG]
784 [KNL] Force usage of a specific region of memory
785 Region of memory to be used, from ss to ss+nn.
786
787 memmap=nn[KMG]#ss[KMG]
788 [KNL,ACPI] Mark specific memory as ACPI data.
789 Region of memory to be used, from ss to ss+nn.
790
791 memmap=nn[KMG]$ss[KMG]
792 [KNL,ACPI] Mark specific memory as reserved.
793 Region of memory to be used, from ss to ss+nn.
794
795 meye.*= [HW] Set MotionEye Camera parameters
796 See Documentation/video4linux/meye.txt.
797
798 mga= [HW,DRM]
799
800 mousedev.tap_time=
801 [MOUSE] Maximum time between finger touching and
802 leaving touchpad surface for touch to be considered
803 a tap and be reported as a left button click (for
804 touchpads working in absolute mode only).
805 Format: <msecs>
806 mousedev.xres= [MOUSE] Horizontal screen resolution, used for devices
807 reporting absolute coordinates, such as tablets
808 mousedev.yres= [MOUSE] Vertical screen resolution, used for devices
809 reporting absolute coordinates, such as tablets
810
811 mpu401= [HW,OSS]
812 Format: <io>,<irq>
813
814 MTD_Partition= [MTD]
815 Format: <name>,<region-number>,<size>,<offset>
816
817 MTD_Region= [MTD]
818 Format: <name>,<region-number>[,<base>,<size>,<buswidth>,<altbuswidth>]
819
820 mtdparts= [MTD]
821 See drivers/mtd/cmdline.c.
822
823 mtouchusb.raw_coordinates=
824 [HW] Make the MicroTouch USB driver use raw coordinates ('y', default)
825 or cooked coordinates ('n')
826
827 n2= [NET] SDL Inc. RISCom/N2 synchronous serial card
828
829 NCR_D700= [HW,SCSI]
830 See header of drivers/scsi/NCR_D700.c.
831
832 ncr5380= [HW,SCSI]
833
834 ncr53c400= [HW,SCSI]
835
836 ncr53c400a= [HW,SCSI]
837
838 ncr53c406a= [HW,SCSI]
839
840 ncr53c8xx= [HW,SCSI]
841
842 netdev= [NET] Network devices parameters
843 Format: <irq>,<io>,<mem_start>,<mem_end>,<name>
844 Note that mem_start is often overloaded to mean
845 something different and driver-specific.
846
847 nfsaddrs= [NFS]
848 See Documentation/nfsroot.txt.
849
850 nfsroot= [NFS] nfs root filesystem for disk-less boxes.
851 See Documentation/nfsroot.txt.
852
853 nmi_watchdog= [KNL,BUGS=IA-32] Debugging features for SMP kernels
854
855 no387 [BUGS=IA-32] Tells the kernel to use the 387 maths
856 emulation library even if a 387 maths coprocessor
857 is present.
858
859 noalign [KNL,ARM]
860
861 noapic [SMP,APIC] Tells the kernel to not make use of any
862 IOAPICs that may be present in the system.
863
864 noasync [HW,M68K] Disables async and sync negotiation for
865 all devices.
866
867 nobats [PPC] Do not use BATs for mapping kernel lowmem
868 on "Classic" PPC cores.
869
870 nocache [ARM]
871
872 nodisconnect [HW,SCSI,M68K] Disables SCSI disconnects.
873
874 noexec [IA-64]
875
876 noexec [IA-32, X86-64]
877 noexec=on: enable non-executable mappings (default)
878 noexec=off: disable nn-executable mappings
879
880 nofxsr [BUGS=IA-32]
881
882 nohlt [BUGS=ARM]
883
884 no-hlt [BUGS=IA-32] Tells the kernel that the hlt
885 instruction doesn't work correctly and not to
886 use it.
887
888 nohalt [IA-64] Tells the kernel not to use the power saving
889 function PAL_HALT_LIGHT when idle. This increases
890 power-consumption. On the positive side, it reduces
891 interrupt wake-up latency, which may improve performance
892 in certain environments such as networked servers or
893 real-time systems.
894
895 noirqdebug [IA-32] Disables the code which attempts to detect and
896 disable unhandled interrupt sources.
897
898 noisapnp [ISAPNP] Disables ISA PnP code.
899
900 noinitrd [RAM] Tells the kernel not to load any configured
901 initial RAM disk.
902
903 nointroute [IA-64]
904
905 nolapic [IA-32,APIC] Do not enable or use the local APIC.
906
907 noltlbs [PPC] Do not use large page/tlb entries for kernel
908 lowmem mapping on PPC40x.
909
910 nomce [IA-32] Machine Check Exception
911
912 noresidual [PPC] Don't use residual data on PReP machines.
913
914 noresume [SWSUSP] Disables resume and restore original swap space.
915
916 no-scroll [VGA] Disables scrollback.
917 This is required for the Braillex ib80-piezo Braille
918 reader made by F.H. Papenmeier (Germany).
919
920 nosbagart [IA-64]
921
922 nosmp [SMP] Tells an SMP kernel to act as a UP kernel.
923
924 nosync [HW,M68K] Disables sync negotiation for all devices.
925
926 notsc [BUGS=IA-32] Disable Time Stamp Counter
927
928 nousb [USB] Disable the USB subsystem
929
930 nowb [ARM]
931
932 opl3= [HW,OSS]
933 Format: <io>
934
935 opl3sa= [HW,OSS]
936 Format: <io>,<irq>,<dma>,<dma2>,<mpu_io>,<mpu_irq>
937
938 opl3sa2= [HW,OSS]
939 Format: <io>,<irq>,<dma>,<dma2>,<mss_io>,<mpu_io>,<ymode>,<loopback>[,<isapnp>,<multiple]
940
941 oprofile.timer= [HW]
942 Use timer interrupt instead of performance counters
943
944 optcd= [HW,CD]
945 Format: <io>
946
947 osst= [HW,SCSI] SCSI Tape Driver
948 Format: <buffer_size>,<write_threshold>
949 See also Documentation/scsi/st.txt.
950
951 panic= [KNL] Kernel behaviour on panic
952 Format: <timeout>
953
954 parkbd.port= [HW] Parallel port number the keyboard adapter is
955 connected to, default is 0.
956 Format: <parport#>
957 parkbd.mode= [HW] Parallel port keyboard adapter mode of operation,
958 0 for XT, 1 for AT (default is AT).
959 Format: <mode>
960
961 parport=0 [HW,PPT] Specify parallel ports. 0 disables.
962 parport=auto Use 'auto' to force the driver to use
963 parport=0xBBB[,IRQ[,DMA]] any IRQ/DMA settings detected (the
964 default is to ignore detected IRQ/DMA
965 settings because of possible
966 conflicts). You can specify the base
967 address, IRQ, and DMA settings; IRQ and
968 DMA should be numbers, or 'auto' (for
969 using detected settings on that
970 particular port), or 'nofifo' (to avoid
971 using a FIFO even if it is detected).
972 Parallel ports are assigned in the
973 order they are specified on the command
974 line, starting with parport0.
975
976 parport_init_mode=
977 [HW,PPT] Configure VIA parallel port to
978 operate in specific mode. This is
979 necessary on Pegasos computer where
980 firmware has no options for setting up
981 parallel port mode and sets it to
982 spp. Currently this function knows
983 686a and 8231 chips.
984 Format: [spp|ps2|epp|ecp|ecpepp]
985
986 pas2= [HW,OSS]
987 Format: <io>,<irq>,<dma>,<dma16>,<sb_io>,<sb_irq>,<sb_dma>,<sb_dma16>
988
989 pas16= [HW,SCSI]
990 See header of drivers/scsi/pas16.c.
991
992 pcbit= [HW,ISDN]
993
994 pcd. [PARIDE]
995 See header of drivers/block/paride/pcd.c.
996 See also Documentation/paride.txt.
997
998 pci=option[,option...] [PCI] various PCI subsystem options:
999 off [IA-32] don't probe for the PCI bus
1000 bios [IA-32] force use of PCI BIOS, don't access
1001 the hardware directly. Use this if your machine
1002 has a non-standard PCI host bridge.
1003 nobios [IA-32] disallow use of PCI BIOS, only direct
1004 hardware access methods are allowed. Use this
1005 if you experience crashes upon bootup and you
1006 suspect they are caused by the BIOS.
1007 conf1 [IA-32] Force use of PCI Configuration Mechanism 1.
1008 conf2 [IA-32] Force use of PCI Configuration Mechanism 2.
1009 nosort [IA-32] Don't sort PCI devices according to
1010 order given by the PCI BIOS. This sorting is done
1011 to get a device order compatible with older kernels.
1012 biosirq [IA-32] Use PCI BIOS calls to get the interrupt
1013 routing table. These calls are known to be buggy
1014 on several machines and they hang the machine when used,
1015 but on other computers it's the only way to get the
1016 interrupt routing table. Try this option if the kernel
1017 is unable to allocate IRQs or discover secondary PCI
1018 buses on your motherboard.
1019 rom [IA-32] Assign address space to expansion ROMs.
1020 Use with caution as certain devices share address
1021 decoders between ROMs and other resources.
1022 irqmask=0xMMMM [IA-32] Set a bit mask of IRQs allowed to be assigned
1023 automatically to PCI devices. You can make the kernel
1024 exclude IRQs of your ISA cards this way.
1025 lastbus=N [IA-32] Scan all buses till bus #N. Can be useful
1026 if the kernel is unable to find your secondary buses
1027 and you want to tell it explicitly which ones they are.
1028 assign-busses [IA-32] Always assign all PCI bus
1029 numbers ourselves, overriding
1030 whatever the firmware may have
1031 done.
1032 usepirqmask [IA-32] Honor the possible IRQ mask
1033 stored in the BIOS $PIR table. This is
1034 needed on some systems with broken
1035 BIOSes, notably some HP Pavilion N5400
1036 and Omnibook XE3 notebooks. This will
1037 have no effect if ACPI IRQ routing is
1038 enabled.
1039 noacpi [IA-32] Do not use ACPI for IRQ routing
1040 or for PCI scanning.
1041 routeirq Do IRQ routing for all PCI devices.
1042 This is normally done in pci_enable_device(),
1043 so this option is a temporary workaround
1044 for broken drivers that don't call it.
1045
1046 firmware [ARM] Do not re-enumerate the bus but
1047 instead just use the configuration
1048 from the bootloader. This is currently
1049 used on IXP2000 systems where the
1050 bus has to be configured a certain way
1051 for adjunct CPUs.
1052
1053 pcmv= [HW,PCMCIA] BadgePAD 4
1054
1055 pd. [PARIDE]
1056 See Documentation/paride.txt.
1057
1058 pdcchassis= [PARISC,HW] Disable/Enable PDC Chassis Status codes at
1059 boot time.
1060 Format: { 0 | 1 }
1061 See arch/parisc/kernel/pdc_chassis.c
1062
1063 pf. [PARIDE]
1064 See Documentation/paride.txt.
1065
1066 pg. [PARIDE]
1067 See Documentation/paride.txt.
1068
1069 pirq= [SMP,APIC] Manual mp-table setup
1070 See Documentation/i386/IO-APIC.txt.
1071
1072 plip= [PPT,NET] Parallel port network link
1073 Format: { parport<nr> | timid | 0 }
1074 See also Documentation/parport.txt.
1075
1076 pnpacpi= [ACPI]
1077 { off }
1078
1079 pnpbios= [ISAPNP]
1080 { on | off | curr | res | no-curr | no-res }
1081
1082 pnp_reserve_irq=
1083 [ISAPNP] Exclude IRQs for the autoconfiguration
1084
1085 pnp_reserve_dma=
1086 [ISAPNP] Exclude DMAs for the autoconfiguration
1087
1088 pnp_reserve_io= [ISAPNP] Exclude I/O ports for the autoconfiguration
1089 Ranges are in pairs (I/O port base and size).
1090
1091 pnp_reserve_mem=
1092 [ISAPNP] Exclude memory regions for the autoconfiguration
1093 Ranges are in pairs (memory base and size).
1094
1095 profile= [KNL] Enable kernel profiling via /proc/profile
1096 { schedule | <number> }
1097 (param: schedule - profile schedule points}
1098 (param: profile step/bucket size as a power of 2 for
1099 statistical time based profiling)
1100
1101 processor.max_cstate= [HW, ACPI]
1102 Limit processor to maximum C-state
1103 max_cstate=9 overrides any DMI blacklist limit.
1104
1105 prompt_ramdisk= [RAM] List of RAM disks to prompt for floppy disk
1106 before loading.
1107 See Documentation/ramdisk.txt.
1108
1109 psmouse.proto= [HW,MOUSE] Highest PS2 mouse protocol extension to
1110 probe for (bare|imps|exps).
1111 psmouse.rate= [HW,MOUSE] Set desired mouse report rate, in reports
1112 per second.
1113 psmouse.resetafter=
1114 [HW,MOUSE] Try to reset the device after so many bad packets
1115 (0 = never).
1116 psmouse.resolution=
1117 [HW,MOUSE] Set desired mouse resolution, in dpi.
1118 psmouse.smartscroll=
1119 [HW,MOUSE] Controls Logitech smartscroll autorepeat,
1120 0 = disabled, 1 = enabled (default).
1121
1122 pss= [HW,OSS] Personal Sound System (ECHO ESC614)
1123 Format: <io>,<mss_io>,<mss_irq>,<mss_dma>,<mpu_io>,<mpu_irq>
1124
1125 pt. [PARIDE]
1126 See Documentation/paride.txt.
1127
1128 quiet= [KNL] Disable log messages
1129
1130 r128= [HW,DRM]
1131
1132 raid= [HW,RAID]
1133 See Documentation/md.txt.
1134
1135 ramdisk= [RAM] Sizes of RAM disks in kilobytes [deprecated]
1136 See Documentation/ramdisk.txt.
1137
1138 ramdisk_blocksize=
1139 [RAM]
1140 See Documentation/ramdisk.txt.
1141
1142 ramdisk_size= [RAM] Sizes of RAM disks in kilobytes
1143 New name for the ramdisk parameter.
1144 See Documentation/ramdisk.txt.
1145
1146 reboot= [BUGS=IA-32,BUGS=ARM,BUGS=IA-64] Rebooting mode
1147 Format: <reboot_mode>[,<reboot_mode2>[,...]]
1148 See arch/*/kernel/reboot.c.
1149
1150 reserve= [KNL,BUGS] Force the kernel to ignore some iomem area
1151
1152 resume= [SWSUSP] Specify the partition device for software suspension
1153
1154 rhash_entries= [KNL,NET]
1155 Set number of hash buckets for route cache
1156
1157 riscom8= [HW,SERIAL]
1158 Format: <io_board1>[,<io_board2>[,...<io_boardN>]]
1159
1160 ro [KNL] Mount root device read-only on boot
1161
1162 root= [KNL] Root filesystem
1163
1164 rootdelay= [KNL] Delay (in seconds) to pause before attempting to
1165 mount the root filesystem
1166
1167 rootflags= [KNL] Set root filesystem mount option string
1168
1169 rootfstype= [KNL] Set root filesystem type
1170
1171 rw [KNL] Mount root device read-write on boot
1172
1173 S [KNL] Run init in single mode
1174
1175 sa1100ir [NET]
1176 See drivers/net/irda/sa1100_ir.c.
1177
1178 sb= [HW,OSS]
1179 Format: <io>,<irq>,<dma>,<dma2>
1180
1181 sbni= [NET] Granch SBNI12 leased line adapter
1182
1183 sbpcd= [HW,CD] Soundblaster CD adapter
1184 Format: <io>,<type>
1185 See a comment before function sbpcd_setup() in
1186 drivers/cdrom/sbpcd.c.
1187
1188 sc1200wdt= [HW,WDT] SC1200 WDT (watchdog) driver
1189 Format: <io>[,<timeout>[,<isapnp>]]
1190
1191 scsi_debug_*= [SCSI]
1192 See drivers/scsi/scsi_debug.c.
1193
1194 scsi_default_dev_flags=
1195 [SCSI] SCSI default device flags
1196 Format: <integer>
1197
1198 scsi_dev_flags= [SCSI] Black/white list entry for vendor and model
1199 Format: <vendor>:<model>:<flags>
1200 (flags are integer value)
1201
1202 scsi_logging= [SCSI]
1203
1204 selinux [SELINUX] Disable or enable SELinux at boot time.
1205 Format: { "0" | "1" }
1206 See security/selinux/Kconfig help text.
1207 0 -- disable.
1208 1 -- enable.
1209 Default value is set via kernel config option.
1210 If enabled at boot time, /selinux/disable can be used
1211 later to disable prior to initial policy load.
1212
1213 serialnumber [BUGS=IA-32]
1214
1215 sg_def_reserved_size=
1216 [SCSI]
1217
1218 sgalaxy= [HW,OSS]
1219 Format: <io>,<irq>,<dma>,<dma2>,<sgbase>
1220
1221 shapers= [NET]
1222 Maximal number of shapers.
1223
1224 sim710= [SCSI,HW]
1225 See header of drivers/scsi/sim710.c.
1226
1227 simeth= [IA-64]
1228 simscsi=
1229
1230 sjcd= [HW,CD]
1231 Format: <io>,<irq>,<dma>
1232 See header of drivers/cdrom/sjcd.c.
1233
1234 slram= [HW,MTD]
1235
1236 smart2= [HW]
1237 Format: <io1>[,<io2>[,...,<io8>]]
1238
1239 snd-ad1816a= [HW,ALSA]
1240
1241 snd-ad1848= [HW,ALSA]
1242
1243 snd-ali5451= [HW,ALSA]
1244
1245 snd-als100= [HW,ALSA]
1246
1247 snd-als4000= [HW,ALSA]
1248
1249 snd-azt2320= [HW,ALSA]
1250
1251 snd-cmi8330= [HW,ALSA]
1252
1253 snd-cmipci= [HW,ALSA]
1254
1255 snd-cs4231= [HW,ALSA]
1256
1257 snd-cs4232= [HW,ALSA]
1258
1259 snd-cs4236= [HW,ALSA]
1260
1261 snd-cs4281= [HW,ALSA]
1262
1263 snd-cs46xx= [HW,ALSA]
1264
1265 snd-dt019x= [HW,ALSA]
1266
1267 snd-dummy= [HW,ALSA]
1268
1269 snd-emu10k1= [HW,ALSA]
1270
1271 snd-ens1370= [HW,ALSA]
1272
1273 snd-ens1371= [HW,ALSA]
1274
1275 snd-es968= [HW,ALSA]
1276
1277 snd-es1688= [HW,ALSA]
1278
1279 snd-es18xx= [HW,ALSA]
1280
1281 snd-es1938= [HW,ALSA]
1282
1283 snd-es1968= [HW,ALSA]
1284
1285 snd-fm801= [HW,ALSA]
1286
1287 snd-gusclassic= [HW,ALSA]
1288
1289 snd-gusextreme= [HW,ALSA]
1290
1291 snd-gusmax= [HW,ALSA]
1292
1293 snd-hdsp= [HW,ALSA]
1294
1295 snd-ice1712= [HW,ALSA]
1296
1297 snd-intel8x0= [HW,ALSA]
1298
1299 snd-interwave= [HW,ALSA]
1300
1301 snd-interwave-stb=
1302 [HW,ALSA]
1303
1304 snd-korg1212= [HW,ALSA]
1305
1306 snd-maestro3= [HW,ALSA]
1307
1308 snd-mpu401= [HW,ALSA]
1309
1310 snd-mtpav= [HW,ALSA]
1311
1312 snd-nm256= [HW,ALSA]
1313
1314 snd-opl3sa2= [HW,ALSA]
1315
1316 snd-opti92x-ad1848=
1317 [HW,ALSA]
1318
1319 snd-opti92x-cs4231=
1320 [HW,ALSA]
1321
1322 snd-opti93x= [HW,ALSA]
1323
1324 snd-pmac= [HW,ALSA]
1325
1326 snd-rme32= [HW,ALSA]
1327
1328 snd-rme96= [HW,ALSA]
1329
1330 snd-rme9652= [HW,ALSA]
1331
1332 snd-sb8= [HW,ALSA]
1333
1334 snd-sb16= [HW,ALSA]
1335
1336 snd-sbawe= [HW,ALSA]
1337
1338 snd-serial= [HW,ALSA]
1339
1340 snd-sgalaxy= [HW,ALSA]
1341
1342 snd-sonicvibes= [HW,ALSA]
1343
1344 snd-sun-amd7930=
1345 [HW,ALSA]
1346
1347 snd-sun-cs4231= [HW,ALSA]
1348
1349 snd-trident= [HW,ALSA]
1350
1351 snd-usb-audio= [HW,ALSA,USB]
1352
1353 snd-via82xx= [HW,ALSA]
1354
1355 snd-virmidi= [HW,ALSA]
1356
1357 snd-wavefront= [HW,ALSA]
1358
1359 snd-ymfpci= [HW,ALSA]
1360
1361 sonicvibes= [HW,OSS]
1362 Format: <reverb>
1363
1364 sonycd535= [HW,CD]
1365 Format: <io>[,<irq>]
1366
1367 sonypi.*= [HW] Sony Programmable I/O Control Device driver
1368 See Documentation/sonypi.txt
1369
1370 specialix= [HW,SERIAL] Specialix multi-serial port adapter
1371 See Documentation/specialix.txt.
1372
1373 spia_io_base= [HW,MTD]
1374 spia_fio_base=
1375 spia_pedr=
1376 spia_peddr=
1377
1378 sscape= [HW,OSS]
1379 Format: <io>,<irq>,<dma>,<mpu_io>,<mpu_irq>
1380
1381 st= [HW,SCSI] SCSI tape parameters (buffers, etc.)
1382 See Documentation/scsi/st.txt.
1383
1384 st0x= [HW,SCSI]
1385 See header of drivers/scsi/seagate.c.
1386
1387 sti= [PARISC,HW]
1388 Format: <num>
1389 Set the STI (builtin display/keyboard on the HP-PARISC
1390 machines) console (graphic card) which should be used
1391 as the initial boot-console.
1392 See also comment in drivers/video/console/sticore.c.
1393
1394 sti_font= [HW]
1395 See comment in drivers/video/console/sticore.c.
1396
1397 stifb= [HW]
1398 Format: bpp:<bpp1>[:<bpp2>[:<bpp3>...]]
1399
1400 stram_swap= [HW,M68k]
1401
1402 swiotlb= [IA-64] Number of I/O TLB slabs
1403
1404 switches= [HW,M68k]
1405
1406 sym53c416= [HW,SCSI]
1407 See header of drivers/scsi/sym53c416.c.
1408
1409 t128= [HW,SCSI]
1410 See header of drivers/scsi/t128.c.
1411
1412 tdfx= [HW,DRM]
1413
1414 thash_entries= [KNL,NET]
1415 Set number of hash buckets for TCP connection
1416
1417 time Show timing data prefixed to each printk message line
1418
1419 tipar.timeout= [HW,PPT]
1420 Set communications timeout in tenths of a second
1421 (default 15).
1422
1423 tipar.delay= [HW,PPT]
1424 Set inter-bit delay in microseconds (default 10).
1425
1426 tmc8xx= [HW,SCSI]
1427 See header of drivers/scsi/seagate.c.
1428
1429 tmscsim= [HW,SCSI]
1430 See comment before function dc390_setup() in
1431 drivers/scsi/tmscsim.c.
1432
1433 tp720= [HW,PS2]
1434
1435 trix= [HW,OSS] MediaTrix AudioTrix Pro
1436 Format: <io>,<irq>,<dma>,<dma2>,<sb_io>,<sb_irq>,<sb_dma>,<mpu_io>,<mpu_irq>
1437
1438 tsdev.xres= [TS] Horizontal screen resolution.
1439 tsdev.yres= [TS] Vertical screen resolution.
1440
1441 turbografx.map[2|3]=
1442 [HW,JOY] TurboGraFX parallel port interface
1443 Format: <port#>,<js1>,<js2>,<js3>,<js4>,<js5>,<js6>,<js7>
1444 See also Documentation/input/joystick-parport.txt
1445
1446 u14-34f= [HW,SCSI] UltraStor 14F/34F SCSI host adapter
1447 See header of drivers/scsi/u14-34f.c.
1448
1449 uart401= [HW,OSS]
1450 Format: <io>,<irq>
1451
1452 uart6850= [HW,OSS]
1453 Format: <io>,<irq>
1454
1455 usb-handoff [HW] Enable early USB BIOS -> OS handoff
1456
1457 usbhid.mousepoll=
1458 [USBHID] The interval which mice are to be polled at.
1459
1460 video= [FB] Frame buffer configuration
1461 See Documentation/fb/modedb.txt.
1462
1463 vga= [BOOT,IA-32] Select a particular video mode
1464 See Documentation/i386/boot.txt and Documentation/svga.txt.
1465 Use vga=ask for menu.
1466 This is actually a boot loader parameter; the value is
1467 passed to the kernel using a special protocol.
1468
1469 vmalloc=nn[KMG] [KNL,BOOT] forces the vmalloc area to have an exact
1470 size of <nn>. This can be used to increase the
1471 minimum size (128MB on x86). It can also be used to
1472 decrease the size and leave more room for directly
1473 mapped kernel RAM.
1474
1475 vmhalt= [KNL,S390]
1476
1477 vmpoff= [KNL,S390]
1478
1479 waveartist= [HW,OSS]
1480 Format: <io>,<irq>,<dma>,<dma2>
1481
1482 wd33c93= [HW,SCSI]
1483 See header of drivers/scsi/wd33c93.c.
1484
1485 wd7000= [HW,SCSI]
1486 See header of drivers/scsi/wd7000.c.
1487
1488 wdt= [WDT] Watchdog
1489 See Documentation/watchdog/watchdog.txt.
1490
1491 xd= [HW,XT] Original XT pre-IDE (RLL encoded) disks.
1492 xd_geo= See header of drivers/block/xd.c.
1493
1494 xirc2ps_cs= [NET,PCMCIA]
1495 Format: <irq>,<irq_mask>,<io>,<full_duplex>,<do_sound>,<lockup_hack>[,<irq2>[,<irq3>[,<irq4>]]]
1496
1497
1498
1499Changelog:
1500
1501 The last known update (for 2.4.0) - the changelog was not kept before.
1502 2000-06-?? Mr. Unknown
1503
1504 Update for 2.5.49, description for most of the options introduced,
1505 references to other documentation (C files, READMEs, ..), added S390,
1506 PPC, SPARC, MTD, ALSA and OSS category. Minor corrections and
1507 reformatting.
1508 2002-11-24 Petr Baudis <pasky@ucw.cz>
1509 Randy Dunlap <randy.dunlap@verizon.net>
1510
1511TODO:
1512
1513 Add documentation for ALSA options.
1514 Add more DRM drivers.
kernel source for telekom puls (alcatel/mediatek)