Commit | Line | Data |
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1da177e4 LT |
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 | 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 | ||
87 | In 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 | ||
93 | Parameters denoted with BOOT are actually interpreted by the boot | |
94 | loader, and have no meaning to the kernel directly. | |
95 | Do not modify the syntax of boot loader parameters without extreme | |
96 | need or coordination with <Documentation/i386/boot.txt>. | |
97 | ||
98 | Note that ALL kernel parameters listed below are CASE SENSITIVE, and that | |
99 | a trailing = on the name of any parameter states that that parameter will | |
100 | be entered as an environment variable, whereas its absence indicates that | |
101 | it will appear as a kernel argument readable via /proc/cmdline by programs | |
102 | running 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 | ||
dc009d92 EB |
361 | crashkernel=nn[KMG]@ss[KMG] |
362 | [KNL] Reserve a chunk of physical memory to | |
363 | hold a kernel to switch to with kexec on panic. | |
364 | ||
1da177e4 LT |
365 | cs4232= [HW,OSS] |
366 | Format: <io>,<irq>,<dma>,<dma2>,<mpuio>,<mpuirq> | |
367 | ||
368 | cs89x0_dma= [HW,NET] | |
369 | Format: <dma> | |
370 | ||
371 | cs89x0_media= [HW,NET] | |
372 | Format: { rj45 | aui | bnc } | |
373 | ||
374 | cyclades= [HW,SERIAL] Cyclades multi-serial port adapter. | |
375 | ||
376 | dasd= [HW,NET] | |
377 | See header of drivers/s390/block/dasd_devmap.c. | |
378 | ||
379 | db9.dev[2|3]= [HW,JOY] Multisystem joystick support via parallel port | |
380 | (one device per port) | |
381 | Format: <port#>,<type> | |
382 | See also Documentation/input/joystick-parport.txt | |
383 | ||
384 | debug [KNL] Enable kernel debugging (events log level). | |
385 | ||
386 | decnet= [HW,NET] | |
387 | Format: <area>[,<node>] | |
388 | See also Documentation/networking/decnet.txt. | |
389 | ||
390 | devfs= [DEVFS] | |
391 | See Documentation/filesystems/devfs/boot-options. | |
392 | ||
393 | dhash_entries= [KNL] | |
394 | Set number of hash buckets for dentry cache. | |
395 | ||
396 | digi= [HW,SERIAL] | |
397 | IO parameters + enable/disable command. | |
398 | ||
399 | digiepca= [HW,SERIAL] | |
400 | See drivers/char/README.epca and | |
401 | Documentation/digiepca.txt. | |
402 | ||
403 | dmascc= [HW,AX25,SERIAL] AX.25 Z80SCC driver with DMA | |
404 | support available. | |
405 | Format: <io_dev0>[,<io_dev1>[,..<io_dev32>]] | |
406 | ||
407 | dmasound= [HW,OSS] Sound subsystem buffers | |
408 | ||
409 | dscc4.setup= [NET] | |
410 | ||
411 | dtc3181e= [HW,SCSI] | |
412 | ||
413 | earlyprintk= [IA-32, X86-64] | |
414 | earlyprintk=vga | |
415 | earlyprintk=serial[,ttySn[,baudrate]] | |
416 | ||
417 | Append ,keep to not disable it when the real console | |
418 | takes over. | |
419 | ||
420 | Only vga or serial at a time, not both. | |
421 | ||
422 | Currently only ttyS0 and ttyS1 are supported. | |
423 | ||
424 | Interaction with the standard serial driver is not | |
425 | very good. | |
426 | ||
427 | The VGA output is eventually overwritten by the real | |
428 | console. | |
429 | ||
430 | eata= [HW,SCSI] | |
431 | ||
432 | eda= [HW,PS2] | |
433 | ||
434 | edb= [HW,PS2] | |
435 | ||
436 | edd= [EDD] | |
437 | Format: {"of[f]" | "sk[ipmbr]"} | |
438 | See comment in arch/i386/boot/edd.S | |
439 | ||
440 | eicon= [HW,ISDN] | |
441 | Format: <id>,<membase>,<irq> | |
442 | ||
443 | eisa_irq_edge= [PARISC,HW] | |
444 | See header of drivers/parisc/eisa.c. | |
445 | ||
446 | elanfreq= [IA-32] | |
447 | See comment before function elanfreq_setup() in | |
448 | arch/i386/kernel/cpu/cpufreq/elanfreq.c. | |
449 | ||
450 | elevator= [IOSCHED] | |
451 | Format: {"as"|"cfq"|"deadline"|"noop"} | |
452 | See Documentation/block/as-iosched.txt | |
453 | and Documentation/block/deadline-iosched.txt for details. | |
2030eae5 VG |
454 | elfcorehdr= [IA-32] |
455 | Specifies physical address of start of kernel core image | |
456 | elf header. | |
457 | See Documentation/kdump.txt for details. | |
1da177e4 LT |
458 | |
459 | enforcing [SELINUX] Set initial enforcing status. | |
460 | Format: {"0" | "1"} | |
461 | See security/selinux/Kconfig help text. | |
462 | 0 -- permissive (log only, no denials). | |
463 | 1 -- enforcing (deny and log). | |
464 | Default value is 0. | |
465 | Value can be changed at runtime via /selinux/enforce. | |
466 | ||
467 | es1370= [HW,OSS] | |
468 | Format: <lineout>[,<micbias>] | |
469 | See also header of sound/oss/es1370.c. | |
470 | ||
471 | es1371= [HW,OSS] | |
472 | Format: <spdif>,[<nomix>,[<amplifier>]] | |
473 | See also header of sound/oss/es1371.c. | |
474 | ||
475 | ether= [HW,NET] Ethernet cards parameters | |
476 | This option is obsoleted by the "netdev=" option, which | |
477 | has equivalent usage. See its documentation for details. | |
478 | ||
479 | eurwdt= [HW,WDT] Eurotech CPU-1220/1410 onboard watchdog. | |
480 | Format: <io>[,<irq>] | |
481 | ||
482 | fd_mcs= [HW,SCSI] | |
483 | See header of drivers/scsi/fd_mcs.c. | |
484 | ||
485 | fdomain= [HW,SCSI] | |
486 | See header of drivers/scsi/fdomain.c. | |
487 | ||
488 | floppy= [HW] | |
489 | See Documentation/floppy.txt. | |
490 | ||
491 | ftape= [HW] Floppy Tape subsystem debugging options. | |
492 | See Documentation/ftape.txt. | |
493 | ||
494 | gamecon.map[2|3]= | |
495 | [HW,JOY] Multisystem joystick and NES/SNES/PSX pad | |
496 | support via parallel port (up to 5 devices per port) | |
497 | Format: <port#>,<pad1>,<pad2>,<pad3>,<pad4>,<pad5> | |
498 | See also Documentation/input/joystick-parport.txt | |
499 | ||
500 | gamma= [HW,DRM] | |
501 | ||
502 | gdth= [HW,SCSI] | |
503 | See header of drivers/scsi/gdth.c. | |
504 | ||
505 | gpt [EFI] Forces disk with valid GPT signature but | |
506 | invalid Protective MBR to be treated as GPT. | |
507 | ||
508 | gscd= [HW,CD] | |
509 | Format: <io> | |
510 | ||
511 | gt96100eth= [NET] MIPS GT96100 Advanced Communication Controller | |
512 | ||
513 | gus= [HW,OSS] | |
514 | Format: <io>,<irq>,<dma>,<dma16> | |
515 | ||
516 | gvp11= [HW,SCSI] | |
517 | ||
518 | hashdist= [KNL,NUMA] Large hashes allocated during boot | |
519 | are distributed across NUMA nodes. Defaults on | |
520 | for IA-64, off otherwise. | |
521 | ||
522 | hcl= [IA-64] SGI's Hardware Graph compatibility layer | |
523 | ||
524 | hd= [EIDE] (E)IDE hard drive subsystem geometry | |
525 | Format: <cyl>,<head>,<sect> | |
526 | ||
527 | hd?= [HW] (E)IDE subsystem | |
528 | hd?lun= See Documentation/ide.txt. | |
529 | ||
530 | highmem=nn[KMG] [KNL,BOOT] forces the highmem zone to have an exact | |
531 | size of <nn>. This works even on boxes that have no | |
532 | highmem otherwise. This also works to reduce highmem | |
533 | size on bigger boxes. | |
534 | ||
535 | hisax= [HW,ISDN] | |
536 | See Documentation/isdn/README.HiSax. | |
537 | ||
538 | hugepages= [HW,IA-32,IA-64] Maximal number of HugeTLB pages. | |
539 | ||
540 | noirqbalance [IA-32,SMP,KNL] Disable kernel irq balancing | |
541 | ||
542 | i8042.direct [HW] Put keyboard port into non-translated mode | |
543 | i8042.dumbkbd [HW] Pretend that controlled can only read data from | |
544 | keyboard and can not control its state | |
545 | (Don't attempt to blink the leds) | |
546 | i8042.noaux [HW] Don't check for auxiliary (== mouse) port | |
547 | i8042.nomux [HW] Don't check presence of an active multiplexing | |
548 | controller | |
549 | i8042.nopnp [HW] Don't use ACPIPnP / PnPBIOS to discover KBD/AUX | |
550 | controllers | |
551 | i8042.panicblink= | |
552 | [HW] Frequency with which keyboard LEDs should blink | |
553 | when kernel panics (default is 0.5 sec) | |
554 | i8042.reset [HW] Reset the controller during init and cleanup | |
555 | i8042.unlock [HW] Unlock (ignore) the keylock | |
556 | ||
557 | i810= [HW,DRM] | |
558 | ||
e70c9d5e DT |
559 | i8k.ignore_dmi [HW] Continue probing hardware even if DMI data |
560 | indicates that the driver is running on unsupported | |
561 | hardware. | |
1da177e4 LT |
562 | i8k.force [HW] Activate i8k driver even if SMM BIOS signature |
563 | does not match list of supported models. | |
564 | i8k.power_status | |
565 | [HW] Report power status in /proc/i8k | |
566 | (disabled by default) | |
567 | i8k.restricted [HW] Allow controlling fans only if SYS_ADMIN | |
568 | capability is set. | |
569 | ||
570 | ibmmcascsi= [HW,MCA,SCSI] IBM MicroChannel SCSI adapter | |
571 | See Documentation/mca.txt. | |
572 | ||
573 | icn= [HW,ISDN] | |
574 | Format: <io>[,<membase>[,<icn_id>[,<icn_id2>]]] | |
575 | ||
576 | ide= [HW] (E)IDE subsystem | |
577 | Format: ide=nodma or ide=doubler or ide=reverse | |
578 | See Documentation/ide.txt. | |
579 | ||
580 | ide?= [HW] (E)IDE subsystem | |
581 | Format: ide?=noprobe or chipset specific parameters. | |
582 | See Documentation/ide.txt. | |
583 | ||
584 | idebus= [HW] (E)IDE subsystem - VLB/PCI bus speed | |
585 | See Documentation/ide.txt. | |
586 | ||
587 | idle= [HW] | |
588 | Format: idle=poll or idle=halt | |
589 | ||
590 | ihash_entries= [KNL] | |
591 | Set number of hash buckets for inode cache. | |
592 | ||
593 | in2000= [HW,SCSI] | |
594 | See header of drivers/scsi/in2000.c. | |
595 | ||
596 | init= [KNL] | |
597 | Format: <full_path> | |
598 | Run specified binary instead of /sbin/init as init | |
599 | process. | |
600 | ||
601 | initcall_debug [KNL] Trace initcalls as they are executed. Useful | |
602 | for working out where the kernel is dying during | |
603 | startup. | |
604 | ||
605 | initrd= [BOOT] Specify the location of the initial ramdisk | |
606 | ||
607 | inport.irq= [HW] Inport (ATI XL and Microsoft) busmouse driver | |
608 | Format: <irq> | |
609 | ||
610 | inttest= [IA64] | |
611 | ||
612 | io7= [HW] IO7 for Marvel based alpha systems | |
613 | See comment before marvel_specify_io7 in | |
614 | arch/alpha/kernel/core_marvel.c. | |
615 | ||
616 | ip= [IP_PNP] | |
617 | See Documentation/nfsroot.txt. | |
618 | ||
619 | ip2= [HW] Set IO/IRQ pairs for up to 4 IntelliPort boards | |
620 | See comment before ip2_setup() in drivers/char/ip2.c. | |
621 | ||
622 | ips= [HW,SCSI] Adaptec / IBM ServeRAID controller | |
623 | See header of drivers/scsi/ips.c. | |
624 | ||
625 | isapnp= [ISAPNP] | |
626 | Format: <RDP>, <reset>, <pci_scan>, <verbosity> | |
627 | ||
628 | isolcpus= [KNL,SMP] Isolate CPUs from the general scheduler. | |
629 | Format: <cpu number>,...,<cpu number> | |
630 | This option can be used to specify one or more CPUs | |
631 | to isolate from the general SMP balancing and scheduling | |
632 | algorithms. The only way to move a process onto or off | |
633 | an "isolated" CPU is via the CPU affinity syscalls. | |
634 | <cpu number> begins at 0 and the maximum value is | |
635 | "number of CPUs in system - 1". | |
636 | ||
637 | This option is the preferred way to isolate CPUs. The | |
638 | alternative - manually setting the CPU mask of all tasks | |
639 | in the system can cause problems and suboptimal load | |
640 | balancer performance. | |
641 | ||
642 | isp16= [HW,CD] | |
643 | Format: <io>,<irq>,<dma>,<setup> | |
644 | ||
645 | iucv= [HW,NET] | |
646 | ||
647 | js= [HW,JOY] Analog joystick | |
648 | See Documentation/input/joystick.txt. | |
649 | ||
650 | keepinitrd [HW,ARM] | |
651 | ||
652 | kstack=N [IA-32, X86-64] Print N words from the kernel stack | |
653 | in oops dumps. | |
654 | ||
655 | l2cr= [PPC] | |
656 | ||
657 | lapic [IA-32,APIC] Enable the local APIC even if BIOS disabled it. | |
658 | ||
659 | lasi= [HW,SCSI] PARISC LASI driver for the 53c700 chip | |
660 | Format: addr:<io>,irq:<irq> | |
661 | ||
662 | llsc*= [IA64] | |
663 | See function print_params() in arch/ia64/sn/kernel/llsc4.c. | |
664 | ||
665 | load_ramdisk= [RAM] List of ramdisks to load from floppy | |
666 | See Documentation/ramdisk.txt. | |
667 | ||
668 | lockd.udpport= [NFS] | |
669 | ||
670 | lockd.tcpport= [NFS] | |
671 | ||
672 | logibm.irq= [HW,MOUSE] Logitech Bus Mouse Driver | |
673 | Format: <irq> | |
674 | ||
675 | loglevel= All Kernel Messages with a loglevel smaller than the | |
676 | console loglevel will be printed to the console. It can | |
677 | also be changed with klogd or other programs. The | |
678 | loglevels are defined as follows: | |
679 | ||
680 | 0 (KERN_EMERG) system is unusable | |
681 | 1 (KERN_ALERT) action must be taken immediately | |
682 | 2 (KERN_CRIT) critical conditions | |
683 | 3 (KERN_ERR) error conditions | |
684 | 4 (KERN_WARNING) warning conditions | |
685 | 5 (KERN_NOTICE) normal but significant condition | |
686 | 6 (KERN_INFO) informational | |
687 | 7 (KERN_DEBUG) debug-level messages | |
688 | ||
689 | log_buf_len=n Sets the size of the printk ring buffer, in bytes. | |
690 | Format is n, nk, nM. n must be a power of two. The | |
691 | default is set in kernel config. | |
692 | ||
693 | lp=0 [LP] Specify parallel ports to use, e.g, | |
694 | lp=port[,port...] lp=none,parport0 (lp0 not configured, lp1 uses | |
695 | lp=reset first parallel port). 'lp=0' disables the | |
696 | lp=auto printer driver. 'lp=reset' (which can be | |
697 | specified in addition to the ports) causes | |
698 | attached printers to be reset. Using | |
699 | lp=port1,port2,... specifies the parallel ports | |
700 | to associate lp devices with, starting with | |
701 | lp0. A port specification may be 'none' to skip | |
702 | that lp device, or a parport name such as | |
703 | 'parport0'. Specifying 'lp=auto' instead of a | |
704 | port specification list means that device IDs | |
705 | from each port should be examined, to see if | |
706 | an IEEE 1284-compliant printer is attached; if | |
707 | so, the driver will manage that printer. | |
708 | See also header of drivers/char/lp.c. | |
709 | ||
710 | lpj=n [KNL] | |
711 | Sets loops_per_jiffy to given constant, thus avoiding | |
712 | time-consuming boot-time autodetection (up to 250 ms per | |
713 | CPU). 0 enables autodetection (default). To determine | |
714 | the correct value for your kernel, boot with normal | |
715 | autodetection and see what value is printed. Note that | |
716 | on SMP systems the preset will be applied to all CPUs, | |
717 | which is likely to cause problems if your CPUs need | |
718 | significantly divergent settings. An incorrect value | |
719 | will cause delays in the kernel to be wrong, leading to | |
720 | unpredictable I/O errors and other breakage. Although | |
721 | unlikely, in the extreme case this might damage your | |
722 | hardware. | |
723 | ||
724 | ltpc= [NET] | |
725 | Format: <io>,<irq>,<dma> | |
726 | ||
727 | mac5380= [HW,SCSI] | |
728 | Format: <can_queue>,<cmd_per_lun>,<sg_tablesize>,<hostid>,<use_tags> | |
729 | ||
730 | mac53c9x= [HW,SCSI] | |
731 | Format: <num_esps>,<disconnect>,<nosync>,<can_queue>,<cmd_per_lun>,<sg_tablesize>,<hostid>,<use_tags> | |
732 | ||
733 | machvec= [IA64] | |
734 | Force the use of a particular machine-vector (machvec) in a generic | |
735 | kernel. Example: machvec=hpzx1_swiotlb | |
736 | ||
737 | mad16= [HW,OSS] | |
738 | Format: <io>,<irq>,<dma>,<dma16>,<mpu_io>,<mpu_irq>,<joystick> | |
739 | ||
740 | maui= [HW,OSS] | |
741 | Format: <io>,<irq> | |
742 | ||
743 | max_loop= [LOOP] Maximum number of loopback devices that can | |
744 | be mounted | |
745 | Format: <1-256> | |
746 | ||
747 | maxcpus= [SMP] Maximum number of processors that an SMP kernel | |
748 | should make use of | |
749 | ||
750 | max_luns= [SCSI] Maximum number of LUNs to probe | |
751 | Should be between 1 and 2^32-1. | |
752 | ||
753 | max_report_luns= | |
754 | [SCSI] Maximum number of LUNs received | |
755 | Should be between 1 and 16384. | |
756 | ||
757 | mca-pentium [BUGS=IA-32] | |
758 | ||
759 | mcatest= [IA-64] | |
760 | ||
761 | mcd= [HW,CD] | |
762 | Format: <port>,<irq>,<mitsumi_bug_93_wait> | |
763 | ||
764 | mcdx= [HW,CD] | |
765 | ||
766 | mce [IA-32] Machine Check Exception | |
767 | ||
768 | md= [HW] RAID subsystems devices and level | |
769 | See Documentation/md.txt. | |
770 | ||
771 | mdacon= [MDA] | |
772 | Format: <first>,<last> | |
773 | Specifies range of consoles to be captured by the MDA. | |
774 | ||
775 | mem=nn[KMG] [KNL,BOOT] Force usage of a specific amount of memory | |
776 | Amount of memory to be used when the kernel is not able | |
777 | to see the whole system memory or for test. | |
778 | [IA-32] Use together with memmap= to avoid physical | |
779 | address space collisions. Without memmap= PCI devices | |
780 | could be placed at addresses belonging to unused RAM. | |
781 | ||
782 | mem=nopentium [BUGS=IA-32] Disable usage of 4MB pages for kernel | |
783 | memory. | |
784 | ||
785 | memmap=exactmap [KNL,IA-32] Enable setting of an exact | |
786 | E820 memory map, as specified by the user. | |
787 | Such memmap=exactmap lines can be constructed based on | |
788 | BIOS output or other requirements. See the memmap=nn@ss | |
789 | option description. | |
790 | ||
791 | memmap=nn[KMG]@ss[KMG] | |
792 | [KNL] Force usage of a specific region of memory | |
793 | Region of memory to be used, from ss to ss+nn. | |
794 | ||
795 | memmap=nn[KMG]#ss[KMG] | |
796 | [KNL,ACPI] Mark specific memory as ACPI data. | |
797 | Region of memory to be used, from ss to ss+nn. | |
798 | ||
799 | memmap=nn[KMG]$ss[KMG] | |
800 | [KNL,ACPI] Mark specific memory as reserved. | |
801 | Region of memory to be used, from ss to ss+nn. | |
802 | ||
803 | meye.*= [HW] Set MotionEye Camera parameters | |
804 | See Documentation/video4linux/meye.txt. | |
805 | ||
806 | mga= [HW,DRM] | |
807 | ||
808 | mousedev.tap_time= | |
809 | [MOUSE] Maximum time between finger touching and | |
810 | leaving touchpad surface for touch to be considered | |
811 | a tap and be reported as a left button click (for | |
812 | touchpads working in absolute mode only). | |
813 | Format: <msecs> | |
814 | mousedev.xres= [MOUSE] Horizontal screen resolution, used for devices | |
815 | reporting absolute coordinates, such as tablets | |
816 | mousedev.yres= [MOUSE] Vertical screen resolution, used for devices | |
817 | reporting absolute coordinates, such as tablets | |
818 | ||
819 | mpu401= [HW,OSS] | |
820 | Format: <io>,<irq> | |
821 | ||
822 | MTD_Partition= [MTD] | |
823 | Format: <name>,<region-number>,<size>,<offset> | |
824 | ||
825 | MTD_Region= [MTD] | |
826 | Format: <name>,<region-number>[,<base>,<size>,<buswidth>,<altbuswidth>] | |
827 | ||
828 | mtdparts= [MTD] | |
829 | See drivers/mtd/cmdline.c. | |
830 | ||
831 | mtouchusb.raw_coordinates= | |
832 | [HW] Make the MicroTouch USB driver use raw coordinates ('y', default) | |
833 | or cooked coordinates ('n') | |
834 | ||
835 | n2= [NET] SDL Inc. RISCom/N2 synchronous serial card | |
836 | ||
837 | NCR_D700= [HW,SCSI] | |
838 | See header of drivers/scsi/NCR_D700.c. | |
839 | ||
840 | ncr5380= [HW,SCSI] | |
841 | ||
842 | ncr53c400= [HW,SCSI] | |
843 | ||
844 | ncr53c400a= [HW,SCSI] | |
845 | ||
846 | ncr53c406a= [HW,SCSI] | |
847 | ||
848 | ncr53c8xx= [HW,SCSI] | |
849 | ||
850 | netdev= [NET] Network devices parameters | |
851 | Format: <irq>,<io>,<mem_start>,<mem_end>,<name> | |
852 | Note that mem_start is often overloaded to mean | |
853 | something different and driver-specific. | |
854 | ||
855 | nfsaddrs= [NFS] | |
856 | See Documentation/nfsroot.txt. | |
857 | ||
858 | nfsroot= [NFS] nfs root filesystem for disk-less boxes. | |
859 | See Documentation/nfsroot.txt. | |
860 | ||
861 | nmi_watchdog= [KNL,BUGS=IA-32] Debugging features for SMP kernels | |
862 | ||
863 | no387 [BUGS=IA-32] Tells the kernel to use the 387 maths | |
864 | emulation library even if a 387 maths coprocessor | |
865 | is present. | |
866 | ||
867 | noalign [KNL,ARM] | |
868 | ||
869 | noapic [SMP,APIC] Tells the kernel to not make use of any | |
870 | IOAPICs that may be present in the system. | |
871 | ||
872 | noasync [HW,M68K] Disables async and sync negotiation for | |
873 | all devices. | |
874 | ||
875 | nobats [PPC] Do not use BATs for mapping kernel lowmem | |
876 | on "Classic" PPC cores. | |
877 | ||
878 | nocache [ARM] | |
879 | ||
880 | nodisconnect [HW,SCSI,M68K] Disables SCSI disconnects. | |
881 | ||
882 | noexec [IA-64] | |
883 | ||
884 | noexec [IA-32, X86-64] | |
885 | noexec=on: enable non-executable mappings (default) | |
886 | noexec=off: disable nn-executable mappings | |
887 | ||
888 | nofxsr [BUGS=IA-32] | |
889 | ||
890 | nohlt [BUGS=ARM] | |
891 | ||
892 | no-hlt [BUGS=IA-32] Tells the kernel that the hlt | |
893 | instruction doesn't work correctly and not to | |
894 | use it. | |
895 | ||
896 | nohalt [IA-64] Tells the kernel not to use the power saving | |
897 | function PAL_HALT_LIGHT when idle. This increases | |
898 | power-consumption. On the positive side, it reduces | |
899 | interrupt wake-up latency, which may improve performance | |
900 | in certain environments such as networked servers or | |
901 | real-time systems. | |
902 | ||
903 | noirqdebug [IA-32] Disables the code which attempts to detect and | |
904 | disable unhandled interrupt sources. | |
905 | ||
906 | noisapnp [ISAPNP] Disables ISA PnP code. | |
907 | ||
908 | noinitrd [RAM] Tells the kernel not to load any configured | |
909 | initial RAM disk. | |
910 | ||
911 | nointroute [IA-64] | |
912 | ||
913 | nolapic [IA-32,APIC] Do not enable or use the local APIC. | |
914 | ||
915 | noltlbs [PPC] Do not use large page/tlb entries for kernel | |
916 | lowmem mapping on PPC40x. | |
917 | ||
918 | nomce [IA-32] Machine Check Exception | |
919 | ||
920 | noresidual [PPC] Don't use residual data on PReP machines. | |
921 | ||
922 | noresume [SWSUSP] Disables resume and restore original swap space. | |
923 | ||
924 | no-scroll [VGA] Disables scrollback. | |
925 | This is required for the Braillex ib80-piezo Braille | |
926 | reader made by F.H. Papenmeier (Germany). | |
927 | ||
928 | nosbagart [IA-64] | |
929 | ||
930 | nosmp [SMP] Tells an SMP kernel to act as a UP kernel. | |
931 | ||
932 | nosync [HW,M68K] Disables sync negotiation for all devices. | |
933 | ||
934 | notsc [BUGS=IA-32] Disable Time Stamp Counter | |
935 | ||
936 | nousb [USB] Disable the USB subsystem | |
937 | ||
938 | nowb [ARM] | |
939 | ||
940 | opl3= [HW,OSS] | |
941 | Format: <io> | |
942 | ||
943 | opl3sa= [HW,OSS] | |
944 | Format: <io>,<irq>,<dma>,<dma2>,<mpu_io>,<mpu_irq> | |
945 | ||
946 | opl3sa2= [HW,OSS] | |
947 | Format: <io>,<irq>,<dma>,<dma2>,<mss_io>,<mpu_io>,<ymode>,<loopback>[,<isapnp>,<multiple] | |
948 | ||
949 | oprofile.timer= [HW] | |
950 | Use timer interrupt instead of performance counters | |
951 | ||
952 | optcd= [HW,CD] | |
953 | Format: <io> | |
954 | ||
955 | osst= [HW,SCSI] SCSI Tape Driver | |
956 | Format: <buffer_size>,<write_threshold> | |
957 | See also Documentation/scsi/st.txt. | |
958 | ||
959 | panic= [KNL] Kernel behaviour on panic | |
960 | Format: <timeout> | |
961 | ||
962 | parkbd.port= [HW] Parallel port number the keyboard adapter is | |
963 | connected to, default is 0. | |
964 | Format: <parport#> | |
965 | parkbd.mode= [HW] Parallel port keyboard adapter mode of operation, | |
966 | 0 for XT, 1 for AT (default is AT). | |
967 | Format: <mode> | |
968 | ||
969 | parport=0 [HW,PPT] Specify parallel ports. 0 disables. | |
970 | parport=auto Use 'auto' to force the driver to use | |
971 | parport=0xBBB[,IRQ[,DMA]] any IRQ/DMA settings detected (the | |
972 | default is to ignore detected IRQ/DMA | |
973 | settings because of possible | |
974 | conflicts). You can specify the base | |
975 | address, IRQ, and DMA settings; IRQ and | |
976 | DMA should be numbers, or 'auto' (for | |
977 | using detected settings on that | |
978 | particular port), or 'nofifo' (to avoid | |
979 | using a FIFO even if it is detected). | |
980 | Parallel ports are assigned in the | |
981 | order they are specified on the command | |
982 | line, starting with parport0. | |
983 | ||
984 | parport_init_mode= | |
985 | [HW,PPT] Configure VIA parallel port to | |
986 | operate in specific mode. This is | |
987 | necessary on Pegasos computer where | |
988 | firmware has no options for setting up | |
989 | parallel port mode and sets it to | |
990 | spp. Currently this function knows | |
991 | 686a and 8231 chips. | |
992 | Format: [spp|ps2|epp|ecp|ecpepp] | |
993 | ||
994 | pas2= [HW,OSS] | |
995 | Format: <io>,<irq>,<dma>,<dma16>,<sb_io>,<sb_irq>,<sb_dma>,<sb_dma16> | |
996 | ||
997 | pas16= [HW,SCSI] | |
998 | See header of drivers/scsi/pas16.c. | |
999 | ||
1000 | pcbit= [HW,ISDN] | |
1001 | ||
1002 | pcd. [PARIDE] | |
1003 | See header of drivers/block/paride/pcd.c. | |
1004 | See also Documentation/paride.txt. | |
1005 | ||
1006 | pci=option[,option...] [PCI] various PCI subsystem options: | |
1007 | off [IA-32] don't probe for the PCI bus | |
1008 | bios [IA-32] force use of PCI BIOS, don't access | |
1009 | the hardware directly. Use this if your machine | |
1010 | has a non-standard PCI host bridge. | |
1011 | nobios [IA-32] disallow use of PCI BIOS, only direct | |
1012 | hardware access methods are allowed. Use this | |
1013 | if you experience crashes upon bootup and you | |
1014 | suspect they are caused by the BIOS. | |
1015 | conf1 [IA-32] Force use of PCI Configuration Mechanism 1. | |
1016 | conf2 [IA-32] Force use of PCI Configuration Mechanism 2. | |
1017 | nosort [IA-32] Don't sort PCI devices according to | |
1018 | order given by the PCI BIOS. This sorting is done | |
1019 | to get a device order compatible with older kernels. | |
1020 | biosirq [IA-32] Use PCI BIOS calls to get the interrupt | |
1021 | routing table. These calls are known to be buggy | |
1022 | on several machines and they hang the machine when used, | |
1023 | but on other computers it's the only way to get the | |
1024 | interrupt routing table. Try this option if the kernel | |
1025 | is unable to allocate IRQs or discover secondary PCI | |
1026 | buses on your motherboard. | |
1027 | rom [IA-32] Assign address space to expansion ROMs. | |
1028 | Use with caution as certain devices share address | |
1029 | decoders between ROMs and other resources. | |
1030 | irqmask=0xMMMM [IA-32] Set a bit mask of IRQs allowed to be assigned | |
1031 | automatically to PCI devices. You can make the kernel | |
1032 | exclude IRQs of your ISA cards this way. | |
1033 | lastbus=N [IA-32] Scan all buses till bus #N. Can be useful | |
1034 | if the kernel is unable to find your secondary buses | |
1035 | and you want to tell it explicitly which ones they are. | |
1036 | assign-busses [IA-32] Always assign all PCI bus | |
1037 | numbers ourselves, overriding | |
1038 | whatever the firmware may have | |
1039 | done. | |
1040 | usepirqmask [IA-32] Honor the possible IRQ mask | |
1041 | stored in the BIOS $PIR table. This is | |
1042 | needed on some systems with broken | |
1043 | BIOSes, notably some HP Pavilion N5400 | |
1044 | and Omnibook XE3 notebooks. This will | |
1045 | have no effect if ACPI IRQ routing is | |
1046 | enabled. | |
1047 | noacpi [IA-32] Do not use ACPI for IRQ routing | |
1048 | or for PCI scanning. | |
1049 | routeirq Do IRQ routing for all PCI devices. | |
1050 | This is normally done in pci_enable_device(), | |
1051 | so this option is a temporary workaround | |
1052 | for broken drivers that don't call it. | |
1053 | ||
1054 | firmware [ARM] Do not re-enumerate the bus but | |
1055 | instead just use the configuration | |
1056 | from the bootloader. This is currently | |
1057 | used on IXP2000 systems where the | |
1058 | bus has to be configured a certain way | |
1059 | for adjunct CPUs. | |
1060 | ||
1061 | pcmv= [HW,PCMCIA] BadgePAD 4 | |
1062 | ||
1063 | pd. [PARIDE] | |
1064 | See Documentation/paride.txt. | |
1065 | ||
1066 | pdcchassis= [PARISC,HW] Disable/Enable PDC Chassis Status codes at | |
1067 | boot time. | |
1068 | Format: { 0 | 1 } | |
1069 | See arch/parisc/kernel/pdc_chassis.c | |
1070 | ||
1071 | pf. [PARIDE] | |
1072 | See Documentation/paride.txt. | |
1073 | ||
1074 | pg. [PARIDE] | |
1075 | See Documentation/paride.txt. | |
1076 | ||
1077 | pirq= [SMP,APIC] Manual mp-table setup | |
1078 | See Documentation/i386/IO-APIC.txt. | |
1079 | ||
1080 | plip= [PPT,NET] Parallel port network link | |
1081 | Format: { parport<nr> | timid | 0 } | |
1082 | See also Documentation/parport.txt. | |
1083 | ||
1084 | pnpacpi= [ACPI] | |
1085 | { off } | |
1086 | ||
1087 | pnpbios= [ISAPNP] | |
1088 | { on | off | curr | res | no-curr | no-res } | |
1089 | ||
1090 | pnp_reserve_irq= | |
1091 | [ISAPNP] Exclude IRQs for the autoconfiguration | |
1092 | ||
1093 | pnp_reserve_dma= | |
1094 | [ISAPNP] Exclude DMAs for the autoconfiguration | |
1095 | ||
1096 | pnp_reserve_io= [ISAPNP] Exclude I/O ports for the autoconfiguration | |
1097 | Ranges are in pairs (I/O port base and size). | |
1098 | ||
1099 | pnp_reserve_mem= | |
1100 | [ISAPNP] Exclude memory regions for the autoconfiguration | |
1101 | Ranges are in pairs (memory base and size). | |
1102 | ||
1103 | profile= [KNL] Enable kernel profiling via /proc/profile | |
1104 | { schedule | <number> } | |
1105 | (param: schedule - profile schedule points} | |
1106 | (param: profile step/bucket size as a power of 2 for | |
1107 | statistical time based profiling) | |
1108 | ||
1109 | processor.max_cstate= [HW, ACPI] | |
1110 | Limit processor to maximum C-state | |
1111 | max_cstate=9 overrides any DMI blacklist limit. | |
1112 | ||
1113 | prompt_ramdisk= [RAM] List of RAM disks to prompt for floppy disk | |
1114 | before loading. | |
1115 | See Documentation/ramdisk.txt. | |
1116 | ||
1117 | psmouse.proto= [HW,MOUSE] Highest PS2 mouse protocol extension to | |
1118 | probe for (bare|imps|exps). | |
1119 | psmouse.rate= [HW,MOUSE] Set desired mouse report rate, in reports | |
1120 | per second. | |
1121 | psmouse.resetafter= | |
1122 | [HW,MOUSE] Try to reset the device after so many bad packets | |
1123 | (0 = never). | |
1124 | psmouse.resolution= | |
1125 | [HW,MOUSE] Set desired mouse resolution, in dpi. | |
1126 | psmouse.smartscroll= | |
1127 | [HW,MOUSE] Controls Logitech smartscroll autorepeat, | |
1128 | 0 = disabled, 1 = enabled (default). | |
1129 | ||
1130 | pss= [HW,OSS] Personal Sound System (ECHO ESC614) | |
1131 | Format: <io>,<mss_io>,<mss_irq>,<mss_dma>,<mpu_io>,<mpu_irq> | |
1132 | ||
1133 | pt. [PARIDE] | |
1134 | See Documentation/paride.txt. | |
1135 | ||
1136 | quiet= [KNL] Disable log messages | |
1137 | ||
1138 | r128= [HW,DRM] | |
1139 | ||
1140 | raid= [HW,RAID] | |
1141 | See Documentation/md.txt. | |
1142 | ||
1143 | ramdisk= [RAM] Sizes of RAM disks in kilobytes [deprecated] | |
1144 | See Documentation/ramdisk.txt. | |
1145 | ||
1146 | ramdisk_blocksize= | |
1147 | [RAM] | |
1148 | See Documentation/ramdisk.txt. | |
1149 | ||
1150 | ramdisk_size= [RAM] Sizes of RAM disks in kilobytes | |
1151 | New name for the ramdisk parameter. | |
1152 | See Documentation/ramdisk.txt. | |
1153 | ||
1154 | reboot= [BUGS=IA-32,BUGS=ARM,BUGS=IA-64] Rebooting mode | |
1155 | Format: <reboot_mode>[,<reboot_mode2>[,...]] | |
1156 | See arch/*/kernel/reboot.c. | |
1157 | ||
1158 | reserve= [KNL,BUGS] Force the kernel to ignore some iomem area | |
1159 | ||
1160 | resume= [SWSUSP] Specify the partition device for software suspension | |
1161 | ||
1162 | rhash_entries= [KNL,NET] | |
1163 | Set number of hash buckets for route cache | |
1164 | ||
1165 | riscom8= [HW,SERIAL] | |
1166 | Format: <io_board1>[,<io_board2>[,...<io_boardN>]] | |
1167 | ||
1168 | ro [KNL] Mount root device read-only on boot | |
1169 | ||
1170 | root= [KNL] Root filesystem | |
1171 | ||
1172 | rootdelay= [KNL] Delay (in seconds) to pause before attempting to | |
1173 | mount the root filesystem | |
1174 | ||
1175 | rootflags= [KNL] Set root filesystem mount option string | |
1176 | ||
1177 | rootfstype= [KNL] Set root filesystem type | |
1178 | ||
1179 | rw [KNL] Mount root device read-write on boot | |
1180 | ||
1181 | S [KNL] Run init in single mode | |
1182 | ||
1183 | sa1100ir [NET] | |
1184 | See drivers/net/irda/sa1100_ir.c. | |
1185 | ||
1186 | sb= [HW,OSS] | |
1187 | Format: <io>,<irq>,<dma>,<dma2> | |
1188 | ||
1189 | sbni= [NET] Granch SBNI12 leased line adapter | |
1190 | ||
1191 | sbpcd= [HW,CD] Soundblaster CD adapter | |
1192 | Format: <io>,<type> | |
1193 | See a comment before function sbpcd_setup() in | |
1194 | drivers/cdrom/sbpcd.c. | |
1195 | ||
1196 | sc1200wdt= [HW,WDT] SC1200 WDT (watchdog) driver | |
1197 | Format: <io>[,<timeout>[,<isapnp>]] | |
1198 | ||
1199 | scsi_debug_*= [SCSI] | |
1200 | See drivers/scsi/scsi_debug.c. | |
1201 | ||
1202 | scsi_default_dev_flags= | |
1203 | [SCSI] SCSI default device flags | |
1204 | Format: <integer> | |
1205 | ||
1206 | scsi_dev_flags= [SCSI] Black/white list entry for vendor and model | |
1207 | Format: <vendor>:<model>:<flags> | |
1208 | (flags are integer value) | |
1209 | ||
1210 | scsi_logging= [SCSI] | |
1211 | ||
1212 | selinux [SELINUX] Disable or enable SELinux at boot time. | |
1213 | Format: { "0" | "1" } | |
1214 | See security/selinux/Kconfig help text. | |
1215 | 0 -- disable. | |
1216 | 1 -- enable. | |
1217 | Default value is set via kernel config option. | |
1218 | If enabled at boot time, /selinux/disable can be used | |
1219 | later to disable prior to initial policy load. | |
1220 | ||
1221 | serialnumber [BUGS=IA-32] | |
1222 | ||
1223 | sg_def_reserved_size= | |
1224 | [SCSI] | |
1225 | ||
1226 | sgalaxy= [HW,OSS] | |
1227 | Format: <io>,<irq>,<dma>,<dma2>,<sgbase> | |
1228 | ||
1229 | shapers= [NET] | |
1230 | Maximal number of shapers. | |
1231 | ||
1232 | sim710= [SCSI,HW] | |
1233 | See header of drivers/scsi/sim710.c. | |
1234 | ||
1235 | simeth= [IA-64] | |
1236 | simscsi= | |
1237 | ||
1238 | sjcd= [HW,CD] | |
1239 | Format: <io>,<irq>,<dma> | |
1240 | See header of drivers/cdrom/sjcd.c. | |
1241 | ||
1242 | slram= [HW,MTD] | |
1243 | ||
1244 | smart2= [HW] | |
1245 | Format: <io1>[,<io2>[,...,<io8>]] | |
1246 | ||
1247 | snd-ad1816a= [HW,ALSA] | |
1248 | ||
1249 | snd-ad1848= [HW,ALSA] | |
1250 | ||
1251 | snd-ali5451= [HW,ALSA] | |
1252 | ||
1253 | snd-als100= [HW,ALSA] | |
1254 | ||
1255 | snd-als4000= [HW,ALSA] | |
1256 | ||
1257 | snd-azt2320= [HW,ALSA] | |
1258 | ||
1259 | snd-cmi8330= [HW,ALSA] | |
1260 | ||
1261 | snd-cmipci= [HW,ALSA] | |
1262 | ||
1263 | snd-cs4231= [HW,ALSA] | |
1264 | ||
1265 | snd-cs4232= [HW,ALSA] | |
1266 | ||
1267 | snd-cs4236= [HW,ALSA] | |
1268 | ||
1269 | snd-cs4281= [HW,ALSA] | |
1270 | ||
1271 | snd-cs46xx= [HW,ALSA] | |
1272 | ||
1273 | snd-dt019x= [HW,ALSA] | |
1274 | ||
1275 | snd-dummy= [HW,ALSA] | |
1276 | ||
1277 | snd-emu10k1= [HW,ALSA] | |
1278 | ||
1279 | snd-ens1370= [HW,ALSA] | |
1280 | ||
1281 | snd-ens1371= [HW,ALSA] | |
1282 | ||
1283 | snd-es968= [HW,ALSA] | |
1284 | ||
1285 | snd-es1688= [HW,ALSA] | |
1286 | ||
1287 | snd-es18xx= [HW,ALSA] | |
1288 | ||
1289 | snd-es1938= [HW,ALSA] | |
1290 | ||
1291 | snd-es1968= [HW,ALSA] | |
1292 | ||
1293 | snd-fm801= [HW,ALSA] | |
1294 | ||
1295 | snd-gusclassic= [HW,ALSA] | |
1296 | ||
1297 | snd-gusextreme= [HW,ALSA] | |
1298 | ||
1299 | snd-gusmax= [HW,ALSA] | |
1300 | ||
1301 | snd-hdsp= [HW,ALSA] | |
1302 | ||
1303 | snd-ice1712= [HW,ALSA] | |
1304 | ||
1305 | snd-intel8x0= [HW,ALSA] | |
1306 | ||
1307 | snd-interwave= [HW,ALSA] | |
1308 | ||
1309 | snd-interwave-stb= | |
1310 | [HW,ALSA] | |
1311 | ||
1312 | snd-korg1212= [HW,ALSA] | |
1313 | ||
1314 | snd-maestro3= [HW,ALSA] | |
1315 | ||
1316 | snd-mpu401= [HW,ALSA] | |
1317 | ||
1318 | snd-mtpav= [HW,ALSA] | |
1319 | ||
1320 | snd-nm256= [HW,ALSA] | |
1321 | ||
1322 | snd-opl3sa2= [HW,ALSA] | |
1323 | ||
1324 | snd-opti92x-ad1848= | |
1325 | [HW,ALSA] | |
1326 | ||
1327 | snd-opti92x-cs4231= | |
1328 | [HW,ALSA] | |
1329 | ||
1330 | snd-opti93x= [HW,ALSA] | |
1331 | ||
1332 | snd-pmac= [HW,ALSA] | |
1333 | ||
1334 | snd-rme32= [HW,ALSA] | |
1335 | ||
1336 | snd-rme96= [HW,ALSA] | |
1337 | ||
1338 | snd-rme9652= [HW,ALSA] | |
1339 | ||
1340 | snd-sb8= [HW,ALSA] | |
1341 | ||
1342 | snd-sb16= [HW,ALSA] | |
1343 | ||
1344 | snd-sbawe= [HW,ALSA] | |
1345 | ||
1346 | snd-serial= [HW,ALSA] | |
1347 | ||
1348 | snd-sgalaxy= [HW,ALSA] | |
1349 | ||
1350 | snd-sonicvibes= [HW,ALSA] | |
1351 | ||
1352 | snd-sun-amd7930= | |
1353 | [HW,ALSA] | |
1354 | ||
1355 | snd-sun-cs4231= [HW,ALSA] | |
1356 | ||
1357 | snd-trident= [HW,ALSA] | |
1358 | ||
1359 | snd-usb-audio= [HW,ALSA,USB] | |
1360 | ||
1361 | snd-via82xx= [HW,ALSA] | |
1362 | ||
1363 | snd-virmidi= [HW,ALSA] | |
1364 | ||
1365 | snd-wavefront= [HW,ALSA] | |
1366 | ||
1367 | snd-ymfpci= [HW,ALSA] | |
1368 | ||
1369 | sonicvibes= [HW,OSS] | |
1370 | Format: <reverb> | |
1371 | ||
1372 | sonycd535= [HW,CD] | |
1373 | Format: <io>[,<irq>] | |
1374 | ||
1375 | sonypi.*= [HW] Sony Programmable I/O Control Device driver | |
1376 | See Documentation/sonypi.txt | |
1377 | ||
1378 | specialix= [HW,SERIAL] Specialix multi-serial port adapter | |
1379 | See Documentation/specialix.txt. | |
1380 | ||
1381 | spia_io_base= [HW,MTD] | |
1382 | spia_fio_base= | |
1383 | spia_pedr= | |
1384 | spia_peddr= | |
1385 | ||
1386 | sscape= [HW,OSS] | |
1387 | Format: <io>,<irq>,<dma>,<mpu_io>,<mpu_irq> | |
1388 | ||
1389 | st= [HW,SCSI] SCSI tape parameters (buffers, etc.) | |
1390 | See Documentation/scsi/st.txt. | |
1391 | ||
1392 | st0x= [HW,SCSI] | |
1393 | See header of drivers/scsi/seagate.c. | |
1394 | ||
1395 | sti= [PARISC,HW] | |
1396 | Format: <num> | |
1397 | Set the STI (builtin display/keyboard on the HP-PARISC | |
1398 | machines) console (graphic card) which should be used | |
1399 | as the initial boot-console. | |
1400 | See also comment in drivers/video/console/sticore.c. | |
1401 | ||
1402 | sti_font= [HW] | |
1403 | See comment in drivers/video/console/sticore.c. | |
1404 | ||
1405 | stifb= [HW] | |
1406 | Format: bpp:<bpp1>[:<bpp2>[:<bpp3>...]] | |
1407 | ||
1408 | stram_swap= [HW,M68k] | |
1409 | ||
1410 | swiotlb= [IA-64] Number of I/O TLB slabs | |
1411 | ||
1412 | switches= [HW,M68k] | |
1413 | ||
1414 | sym53c416= [HW,SCSI] | |
1415 | See header of drivers/scsi/sym53c416.c. | |
1416 | ||
1417 | t128= [HW,SCSI] | |
1418 | See header of drivers/scsi/t128.c. | |
1419 | ||
1420 | tdfx= [HW,DRM] | |
1421 | ||
1422 | thash_entries= [KNL,NET] | |
1423 | Set number of hash buckets for TCP connection | |
1424 | ||
1425 | time Show timing data prefixed to each printk message line | |
1426 | ||
1427 | tipar.timeout= [HW,PPT] | |
1428 | Set communications timeout in tenths of a second | |
1429 | (default 15). | |
1430 | ||
1431 | tipar.delay= [HW,PPT] | |
1432 | Set inter-bit delay in microseconds (default 10). | |
1433 | ||
1434 | tmc8xx= [HW,SCSI] | |
1435 | See header of drivers/scsi/seagate.c. | |
1436 | ||
1437 | tmscsim= [HW,SCSI] | |
1438 | See comment before function dc390_setup() in | |
1439 | drivers/scsi/tmscsim.c. | |
1440 | ||
1441 | tp720= [HW,PS2] | |
1442 | ||
1443 | trix= [HW,OSS] MediaTrix AudioTrix Pro | |
1444 | Format: <io>,<irq>,<dma>,<dma2>,<sb_io>,<sb_irq>,<sb_dma>,<mpu_io>,<mpu_irq> | |
1445 | ||
1446 | tsdev.xres= [TS] Horizontal screen resolution. | |
1447 | tsdev.yres= [TS] Vertical screen resolution. | |
1448 | ||
1449 | turbografx.map[2|3]= | |
1450 | [HW,JOY] TurboGraFX parallel port interface | |
1451 | Format: <port#>,<js1>,<js2>,<js3>,<js4>,<js5>,<js6>,<js7> | |
1452 | See also Documentation/input/joystick-parport.txt | |
1453 | ||
1454 | u14-34f= [HW,SCSI] UltraStor 14F/34F SCSI host adapter | |
1455 | See header of drivers/scsi/u14-34f.c. | |
1456 | ||
1457 | uart401= [HW,OSS] | |
1458 | Format: <io>,<irq> | |
1459 | ||
1460 | uart6850= [HW,OSS] | |
1461 | Format: <io>,<irq> | |
1462 | ||
1463 | usb-handoff [HW] Enable early USB BIOS -> OS handoff | |
1464 | ||
1465 | usbhid.mousepoll= | |
1466 | [USBHID] The interval which mice are to be polled at. | |
1467 | ||
1468 | video= [FB] Frame buffer configuration | |
1469 | See Documentation/fb/modedb.txt. | |
1470 | ||
1471 | vga= [BOOT,IA-32] Select a particular video mode | |
1472 | See Documentation/i386/boot.txt and Documentation/svga.txt. | |
1473 | Use vga=ask for menu. | |
1474 | This is actually a boot loader parameter; the value is | |
1475 | passed to the kernel using a special protocol. | |
1476 | ||
1477 | vmalloc=nn[KMG] [KNL,BOOT] forces the vmalloc area to have an exact | |
1478 | size of <nn>. This can be used to increase the | |
1479 | minimum size (128MB on x86). It can also be used to | |
1480 | decrease the size and leave more room for directly | |
1481 | mapped kernel RAM. | |
1482 | ||
1483 | vmhalt= [KNL,S390] | |
1484 | ||
1485 | vmpoff= [KNL,S390] | |
1486 | ||
1487 | waveartist= [HW,OSS] | |
1488 | Format: <io>,<irq>,<dma>,<dma2> | |
1489 | ||
1490 | wd33c93= [HW,SCSI] | |
1491 | See header of drivers/scsi/wd33c93.c. | |
1492 | ||
1493 | wd7000= [HW,SCSI] | |
1494 | See header of drivers/scsi/wd7000.c. | |
1495 | ||
1496 | wdt= [WDT] Watchdog | |
1497 | See Documentation/watchdog/watchdog.txt. | |
1498 | ||
1499 | xd= [HW,XT] Original XT pre-IDE (RLL encoded) disks. | |
1500 | xd_geo= See header of drivers/block/xd.c. | |
1501 | ||
1502 | xirc2ps_cs= [NET,PCMCIA] | |
1503 | Format: <irq>,<irq_mask>,<io>,<full_duplex>,<do_sound>,<lockup_hack>[,<irq2>[,<irq3>[,<irq4>]]] | |
1504 | ||
1505 | ||
1506 | ||
1507 | Changelog: | |
1508 | ||
1509 | The last known update (for 2.4.0) - the changelog was not kept before. | |
1510 | 2000-06-?? Mr. Unknown | |
1511 | ||
1512 | Update for 2.5.49, description for most of the options introduced, | |
1513 | references to other documentation (C files, READMEs, ..), added S390, | |
1514 | PPC, SPARC, MTD, ALSA and OSS category. Minor corrections and | |
1515 | reformatting. | |
1516 | 2002-11-24 Petr Baudis <pasky@ucw.cz> | |
1517 | Randy Dunlap <randy.dunlap@verizon.net> | |
1518 | ||
1519 | TODO: | |
1520 | ||
1521 | Add documentation for ALSA options. | |
1522 | Add more DRM drivers. |