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1 | Kernel Parameters | |
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 | This document may not be entirely up to date and comprehensive. The command | |
21 | "modinfo -p ${modulename}" shows a current list of all parameters of a loadable | |
22 | module. Loadable modules, after being loaded into the running kernel, also | |
23 | reveal their parameters in /sys/module/${modulename}/parameters/. Some of these | |
24 | parameters may be changed at runtime by the command | |
25 | "echo -n ${value} > /sys/module/${modulename}/parameters/${parm}". | |
26 | ||
27 | The parameters listed below are only valid if certain kernel build options were | |
28 | enabled and if respective hardware is present. The text in square brackets at | |
29 | the beginning of each description states the restrictions within which a | |
30 | parameter is applicable: | |
31 | ||
32 | ACPI ACPI support is enabled. | |
33 | AGP AGP (Accelerated Graphics Port) is enabled. | |
34 | ALSA ALSA sound support is enabled. | |
35 | APIC APIC support is enabled. | |
36 | APM Advanced Power Management support is enabled. | |
37 | AVR32 AVR32 architecture is enabled. | |
38 | AX25 Appropriate AX.25 support is enabled. | |
39 | BLACKFIN Blackfin architecture is enabled. | |
40 | DRM Direct Rendering Management support is enabled. | |
41 | EDD BIOS Enhanced Disk Drive Services (EDD) is enabled | |
42 | EFI EFI Partitioning (GPT) is enabled | |
43 | EIDE EIDE/ATAPI support is enabled. | |
44 | FB The frame buffer device is enabled. | |
45 | HW Appropriate hardware is enabled. | |
46 | IA-64 IA-64 architecture is enabled. | |
47 | IOSCHED More than one I/O scheduler is enabled. | |
48 | IP_PNP IP DHCP, BOOTP, or RARP is enabled. | |
49 | ISAPNP ISA PnP code is enabled. | |
50 | ISDN Appropriate ISDN support is enabled. | |
51 | JOY Appropriate joystick support is enabled. | |
52 | LIBATA Libata driver is enabled | |
53 | LP Printer support is enabled. | |
54 | LOOP Loopback device support is enabled. | |
55 | M68k M68k architecture is enabled. | |
56 | These options have more detailed description inside of | |
57 | Documentation/m68k/kernel-options.txt. | |
58 | MCA MCA bus support is enabled. | |
59 | MDA MDA console support is enabled. | |
60 | MOUSE Appropriate mouse support is enabled. | |
61 | MSI Message Signaled Interrupts (PCI). | |
62 | MTD MTD (Memory Technology Device) support is enabled. | |
63 | NET Appropriate network support is enabled. | |
64 | NUMA NUMA support is enabled. | |
65 | GENERIC_TIME The generic timeofday code is enabled. | |
66 | NFS Appropriate NFS support is enabled. | |
67 | OSS OSS sound support is enabled. | |
68 | PV_OPS A paravirtualized kernel is enabled. | |
69 | PARIDE The ParIDE (parallel port IDE) subsystem is enabled. | |
70 | PARISC The PA-RISC architecture is enabled. | |
71 | PCI PCI bus support is enabled. | |
72 | PCIE PCI Express support is enabled. | |
73 | PCMCIA The PCMCIA subsystem is enabled. | |
74 | PNP Plug & Play support is enabled. | |
75 | PPC PowerPC architecture is enabled. | |
76 | PPT Parallel port support is enabled. | |
77 | PS2 Appropriate PS/2 support is enabled. | |
78 | RAM RAM disk support is enabled. | |
79 | ROOTPLUG The example Root Plug LSM is enabled. | |
80 | S390 S390 architecture is enabled. | |
81 | SCSI Appropriate SCSI support is enabled. | |
82 | A lot of drivers has their options described inside of | |
83 | Documentation/scsi/. | |
84 | SECURITY Different security models are enabled. | |
85 | SELINUX SELinux support is enabled. | |
86 | SERIAL Serial support is enabled. | |
87 | SH SuperH architecture is enabled. | |
88 | SMP The kernel is an SMP kernel. | |
89 | SPARC Sparc architecture is enabled. | |
90 | SWSUSP Software suspend is enabled. | |
91 | TS Appropriate touchscreen support is enabled. | |
92 | USB USB support is enabled. | |
93 | USBHID USB Human Interface Device support is enabled. | |
94 | V4L Video For Linux support is enabled. | |
95 | VGA The VGA console has been enabled. | |
96 | VT Virtual terminal support is enabled. | |
97 | WDT Watchdog support is enabled. | |
98 | XT IBM PC/XT MFM hard disk support is enabled. | |
99 | X86-32 X86-32, aka i386 architecture is enabled. | |
100 | X86-64 X86-64 architecture is enabled. | |
101 | More X86-64 boot options can be found in | |
102 | Documentation/x86_64/boot-options.txt . | |
103 | ||
104 | In addition, the following text indicates that the option: | |
105 | ||
106 | BUGS= Relates to possible processor bugs on the said processor. | |
107 | KNL Is a kernel start-up parameter. | |
108 | BOOT Is a boot loader parameter. | |
109 | ||
110 | Parameters denoted with BOOT are actually interpreted by the boot | |
111 | loader, and have no meaning to the kernel directly. | |
112 | Do not modify the syntax of boot loader parameters without extreme | |
113 | need or coordination with <Documentation/i386/boot.txt>. | |
114 | ||
115 | There are also arch-specific kernel-parameters not documented here. | |
116 | See for example <Documentation/x86_64/boot-options.txt>. | |
117 | ||
118 | Note that ALL kernel parameters listed below are CASE SENSITIVE, and that | |
119 | a trailing = on the name of any parameter states that that parameter will | |
120 | be entered as an environment variable, whereas its absence indicates that | |
121 | it will appear as a kernel argument readable via /proc/cmdline by programs | |
122 | running once the system is up. | |
123 | ||
124 | The number of kernel parameters is not limited, but the length of the | |
125 | complete command line (parameters including spaces etc.) is limited to | |
126 | a fixed number of characters. This limit depends on the architecture | |
127 | and is between 256 and 4096 characters. It is defined in the file | |
128 | ./include/asm/setup.h as COMMAND_LINE_SIZE. | |
129 | ||
130 | ||
131 | acpi= [HW,ACPI,X86-64,i386] | |
132 | Advanced Configuration and Power Interface | |
133 | Format: { force | off | ht | strict | noirq } | |
134 | force -- enable ACPI if default was off | |
135 | off -- disable ACPI if default was on | |
136 | noirq -- do not use ACPI for IRQ routing | |
137 | ht -- run only enough ACPI to enable Hyper Threading | |
138 | strict -- Be less tolerant of platforms that are not | |
139 | strictly ACPI specification compliant. | |
140 | ||
141 | See also Documentation/power/pm.txt, pci=noacpi | |
142 | ||
143 | acpi_apic_instance= [ACPI, IOAPIC] | |
144 | Format: <int> | |
145 | 2: use 2nd APIC table, if available | |
146 | 1,0: use 1st APIC table | |
147 | default: 0 | |
148 | ||
149 | acpi_sleep= [HW,ACPI] Sleep options | |
150 | Format: { s3_bios, s3_mode, s3_beep } | |
151 | See Documentation/power/video.txt for s3_bios and s3_mode. | |
152 | s3_beep is for debugging; it makes the PC's speaker beep | |
153 | as soon as the kernel's real-mode entry point is called. | |
154 | ||
155 | acpi_sci= [HW,ACPI] ACPI System Control Interrupt trigger mode | |
156 | Format: { level | edge | high | low } | |
157 | ||
158 | acpi_irq_balance [HW,ACPI] | |
159 | ACPI will balance active IRQs | |
160 | default in APIC mode | |
161 | ||
162 | acpi_irq_nobalance [HW,ACPI] | |
163 | ACPI will not move active IRQs (default) | |
164 | default in PIC mode | |
165 | ||
166 | acpi_irq_pci= [HW,ACPI] If irq_balance, clear listed IRQs for | |
167 | use by PCI | |
168 | Format: <irq>,<irq>... | |
169 | ||
170 | acpi_irq_isa= [HW,ACPI] If irq_balance, mark listed IRQs used by ISA | |
171 | Format: <irq>,<irq>... | |
172 | ||
173 | acpi_no_auto_ssdt [HW,ACPI] Disable automatic loading of SSDT | |
174 | ||
175 | acpi_os_name= [HW,ACPI] Tell ACPI BIOS the name of the OS | |
176 | Format: To spoof as Windows 98: ="Microsoft Windows" | |
177 | ||
178 | acpi_osi= [HW,ACPI] Modify list of supported OS interface strings | |
179 | acpi_osi="string1" # add string1 -- only one string | |
180 | acpi_osi="!string2" # remove built-in string2 | |
181 | acpi_osi= # disable all strings | |
182 | ||
183 | acpi_serialize [HW,ACPI] force serialization of AML methods | |
184 | ||
185 | acpi_skip_timer_override [HW,ACPI] | |
186 | Recognize and ignore IRQ0/pin2 Interrupt Override. | |
187 | For broken nForce2 BIOS resulting in XT-PIC timer. | |
188 | acpi_use_timer_override [HW,ACPI} | |
189 | Use timer override. For some broken Nvidia NF5 boards | |
190 | that require a timer override, but don't have | |
191 | HPET | |
192 | ||
193 | acpi.debug_layer= [HW,ACPI] | |
194 | Format: <int> | |
195 | Each bit of the <int> indicates an ACPI debug layer, | |
196 | 1: enable, 0: disable. It is useful for boot time | |
197 | debugging. After system has booted up, it can be set | |
198 | via /sys/module/acpi/parameters/debug_layer. | |
199 | CONFIG_ACPI_DEBUG must be enabled for this to produce any output. | |
200 | Available bits (add the numbers together) to enable debug output | |
201 | for specific parts of the ACPI subsystem: | |
202 | 0x01 utilities 0x02 hardware 0x04 events 0x08 tables | |
203 | 0x10 namespace 0x20 parser 0x40 dispatcher | |
204 | 0x80 executer 0x100 resources 0x200 acpica debugger | |
205 | 0x400 os services 0x800 acpica disassembler. | |
206 | The number can be in decimal or prefixed with 0x in hex. | |
207 | Warning: Many of these options can produce a lot of | |
208 | output and make your system unusable. Be very careful. | |
209 | ||
210 | acpi.debug_level= [HW,ACPI] | |
211 | Format: <int> | |
212 | Each bit of the <int> indicates an ACPI debug level, | |
213 | 1: enable, 0: disable. It is useful for boot time | |
214 | debugging. After system has booted up, it can be set | |
215 | via /sys/module/acpi/parameters/debug_level. | |
216 | CONFIG_ACPI_DEBUG must be enabled for this to produce any output. | |
217 | Available bits (add the numbers together) to enable different | |
218 | debug output levels of the ACPI subsystem: | |
219 | 0x01 error 0x02 warn 0x04 init 0x08 debug object | |
220 | 0x10 info 0x20 init names 0x40 parse 0x80 load | |
221 | 0x100 dispatch 0x200 execute 0x400 names 0x800 operation region | |
222 | 0x1000 bfield 0x2000 tables 0x4000 values 0x8000 objects | |
223 | 0x10000 resources 0x20000 user requests 0x40000 package. | |
224 | The number can be in decimal or prefixed with 0x in hex. | |
225 | Warning: Many of these options can produce a lot of | |
226 | output and make your system unusable. Be very careful. | |
227 | ||
228 | acpi_pm_good [X86-32,X86-64] | |
229 | Override the pmtimer bug detection: force the kernel | |
230 | to assume that this machine's pmtimer latches its value | |
231 | and always returns good values. | |
232 | ||
233 | agp= [AGP] | |
234 | { off | try_unsupported } | |
235 | off: disable AGP support | |
236 | try_unsupported: try to drive unsupported chipsets | |
237 | (may crash computer or cause data corruption) | |
238 | ||
239 | enable_timer_pin_1 [i386,x86-64] | |
240 | Enable PIN 1 of APIC timer | |
241 | Can be useful to work around chipset bugs | |
242 | (in particular on some ATI chipsets). | |
243 | The kernel tries to set a reasonable default. | |
244 | ||
245 | disable_timer_pin_1 [i386,x86-64] | |
246 | Disable PIN 1 of APIC timer | |
247 | Can be useful to work around chipset bugs. | |
248 | ||
249 | ad1848= [HW,OSS] | |
250 | Format: <io>,<irq>,<dma>,<dma2>,<type> | |
251 | ||
252 | advansys= [HW,SCSI] | |
253 | See header of drivers/scsi/advansys.c. | |
254 | ||
255 | advwdt= [HW,WDT] Advantech WDT | |
256 | Format: <iostart>,<iostop> | |
257 | ||
258 | aedsp16= [HW,OSS] Audio Excel DSP 16 | |
259 | Format: <io>,<irq>,<dma>,<mss_io>,<mpu_io>,<mpu_irq> | |
260 | See also header of sound/oss/aedsp16.c. | |
261 | ||
262 | aha152x= [HW,SCSI] | |
263 | See Documentation/scsi/aha152x.txt. | |
264 | ||
265 | aha1542= [HW,SCSI] | |
266 | Format: <portbase>[,<buson>,<busoff>[,<dmaspeed>]] | |
267 | ||
268 | aic7xxx= [HW,SCSI] | |
269 | See Documentation/scsi/aic7xxx.txt. | |
270 | ||
271 | aic79xx= [HW,SCSI] | |
272 | See Documentation/scsi/aic79xx.txt. | |
273 | ||
274 | amd_iommu= [HW,X86-84] | |
275 | Pass parameters to the AMD IOMMU driver in the system. | |
276 | Possible values are: | |
277 | isolate - enable device isolation (each device, as far | |
278 | as possible, will get its own protection | |
279 | domain) | |
280 | amd_iommu_size= [HW,X86-64] | |
281 | Define the size of the aperture for the AMD IOMMU | |
282 | driver. Possible values are: | |
283 | '32M', '64M' (default), '128M', '256M', '512M', '1G' | |
284 | ||
285 | amijoy.map= [HW,JOY] Amiga joystick support | |
286 | Map of devices attached to JOY0DAT and JOY1DAT | |
287 | Format: <a>,<b> | |
288 | See also Documentation/kernel/input/joystick.txt | |
289 | ||
290 | analog.map= [HW,JOY] Analog joystick and gamepad support | |
291 | Specifies type or capabilities of an analog joystick | |
292 | connected to one of 16 gameports | |
293 | Format: <type1>,<type2>,..<type16> | |
294 | ||
295 | apc= [HW,SPARC] | |
296 | Power management functions (SPARCstation-4/5 + deriv.) | |
297 | Format: noidle | |
298 | Disable APC CPU standby support. SPARCstation-Fox does | |
299 | not play well with APC CPU idle - disable it if you have | |
300 | APC and your system crashes randomly. | |
301 | ||
302 | apic= [APIC,i386] Advanced Programmable Interrupt Controller | |
303 | Change the output verbosity whilst booting | |
304 | Format: { quiet (default) | verbose | debug } | |
305 | Change the amount of debugging information output | |
306 | when initialising the APIC and IO-APIC components. | |
307 | ||
308 | apm= [APM] Advanced Power Management | |
309 | See header of arch/x86/kernel/apm_32.c. | |
310 | ||
311 | arcrimi= [HW,NET] ARCnet - "RIM I" (entirely mem-mapped) cards | |
312 | Format: <io>,<irq>,<nodeID> | |
313 | ||
314 | ataflop= [HW,M68k] | |
315 | ||
316 | atarimouse= [HW,MOUSE] Atari Mouse | |
317 | ||
318 | atascsi= [HW,SCSI] Atari SCSI | |
319 | ||
320 | atkbd.extra= [HW] Enable extra LEDs and keys on IBM RapidAccess, | |
321 | EzKey and similar keyboards | |
322 | ||
323 | atkbd.reset= [HW] Reset keyboard during initialization | |
324 | ||
325 | atkbd.set= [HW] Select keyboard code set | |
326 | Format: <int> (2 = AT (default), 3 = PS/2) | |
327 | ||
328 | atkbd.scroll= [HW] Enable scroll wheel on MS Office and similar | |
329 | keyboards | |
330 | ||
331 | atkbd.softraw= [HW] Choose between synthetic and real raw mode | |
332 | Format: <bool> (0 = real, 1 = synthetic (default)) | |
333 | ||
334 | atkbd.softrepeat= [HW] | |
335 | Use software keyboard repeat | |
336 | ||
337 | autotest [IA64] | |
338 | ||
339 | baycom_epp= [HW,AX25] | |
340 | Format: <io>,<mode> | |
341 | ||
342 | baycom_par= [HW,AX25] BayCom Parallel Port AX.25 Modem | |
343 | Format: <io>,<mode> | |
344 | See header of drivers/net/hamradio/baycom_par.c. | |
345 | ||
346 | baycom_ser_fdx= [HW,AX25] | |
347 | BayCom Serial Port AX.25 Modem (Full Duplex Mode) | |
348 | Format: <io>,<irq>,<mode>[,<baud>] | |
349 | See header of drivers/net/hamradio/baycom_ser_fdx.c. | |
350 | ||
351 | baycom_ser_hdx= [HW,AX25] | |
352 | BayCom Serial Port AX.25 Modem (Half Duplex Mode) | |
353 | Format: <io>,<irq>,<mode> | |
354 | See header of drivers/net/hamradio/baycom_ser_hdx.c. | |
355 | ||
356 | boot_delay= Milliseconds to delay each printk during boot. | |
357 | Values larger than 10 seconds (10000) are changed to | |
358 | no delay (0). | |
359 | Format: integer | |
360 | ||
361 | bttv.card= [HW,V4L] bttv (bt848 + bt878 based grabber cards) | |
362 | bttv.radio= Most important insmod options are available as | |
363 | kernel args too. | |
364 | bttv.pll= See Documentation/video4linux/bttv/Insmod-options | |
365 | bttv.tuner= and Documentation/video4linux/bttv/CARDLIST | |
366 | ||
367 | BusLogic= [HW,SCSI] | |
368 | See drivers/scsi/BusLogic.c, comment before function | |
369 | BusLogic_ParseDriverOptions(). | |
370 | ||
371 | c101= [NET] Moxa C101 synchronous serial card | |
372 | ||
373 | cachesize= [BUGS=X86-32] Override level 2 CPU cache size detection. | |
374 | Sometimes CPU hardware bugs make them report the cache | |
375 | size incorrectly. The kernel will attempt work arounds | |
376 | to fix known problems, but for some CPUs it is not | |
377 | possible to determine what the correct size should be. | |
378 | This option provides an override for these situations. | |
379 | ||
380 | security= [SECURITY] Choose a security module to enable at boot. | |
381 | If this boot parameter is not specified, only the first | |
382 | security module asking for security registration will be | |
383 | loaded. An invalid security module name will be treated | |
384 | as if no module has been chosen. | |
385 | ||
386 | capability.disable= | |
387 | [SECURITY] Disable capabilities. This would normally | |
388 | be used only if an alternative security model is to be | |
389 | configured. Potentially dangerous and should only be | |
390 | used if you are entirely sure of the consequences. | |
391 | ||
392 | ccw_timeout_log [S390] | |
393 | See Documentation/s390/CommonIO for details. | |
394 | ||
395 | cgroup_disable= [KNL] Disable a particular controller | |
396 | Format: {name of the controller(s) to disable} | |
397 | {Currently supported controllers - "memory"} | |
398 | ||
399 | checkreqprot [SELINUX] Set initial checkreqprot flag value. | |
400 | Format: { "0" | "1" } | |
401 | See security/selinux/Kconfig help text. | |
402 | 0 -- check protection applied by kernel (includes | |
403 | any implied execute protection). | |
404 | 1 -- check protection requested by application. | |
405 | Default value is set via a kernel config option. | |
406 | Value can be changed at runtime via | |
407 | /selinux/checkreqprot. | |
408 | ||
409 | cio_ignore= [S390] | |
410 | See Documentation/s390/CommonIO for details. | |
411 | ||
412 | clock= [BUGS=X86-32, HW] gettimeofday clocksource override. | |
413 | [Deprecated] | |
414 | Forces specified clocksource (if available) to be used | |
415 | when calculating gettimeofday(). If specified | |
416 | clocksource is not available, it defaults to PIT. | |
417 | Format: { pit | tsc | cyclone | pmtmr } | |
418 | ||
419 | clocksource= [GENERIC_TIME] Override the default clocksource | |
420 | Format: <string> | |
421 | Override the default clocksource and use the clocksource | |
422 | with the name specified. | |
423 | Some clocksource names to choose from, depending on | |
424 | the platform: | |
425 | [all] jiffies (this is the base, fallback clocksource) | |
426 | [ACPI] acpi_pm | |
427 | [ARM] imx_timer1,OSTS,netx_timer,mpu_timer2, | |
428 | pxa_timer,timer3,32k_counter,timer0_1 | |
429 | [AVR32] avr32 | |
430 | [X86-32] pit,hpet,tsc,vmi-timer; | |
431 | scx200_hrt on Geode; cyclone on IBM x440 | |
432 | [MIPS] MIPS | |
433 | [PARISC] cr16 | |
434 | [S390] tod | |
435 | [SH] SuperH | |
436 | [SPARC64] tick | |
437 | [X86-64] hpet,tsc | |
438 | ||
439 | clearcpuid=BITNUM [X86] | |
440 | Disable CPUID feature X for the kernel. See | |
441 | include/asm-x86/cpufeature.h for the valid bit numbers. | |
442 | Note the Linux specific bits are not necessarily | |
443 | stable over kernel options, but the vendor specific | |
444 | ones should be. | |
445 | Also note that user programs calling CPUID directly | |
446 | or using the feature without checking anything | |
447 | will still see it. This just prevents it from | |
448 | being used by the kernel or shown in /proc/cpuinfo. | |
449 | Also note the kernel might malfunction if you disable | |
450 | some critical bits. | |
451 | ||
452 | code_bytes [IA32/X86_64] How many bytes of object code to print | |
453 | in an oops report. | |
454 | Range: 0 - 8192 | |
455 | Default: 64 | |
456 | ||
457 | disable_8254_timer | |
458 | enable_8254_timer | |
459 | [IA32/X86_64] Disable/Enable interrupt 0 timer routing | |
460 | over the 8254 in addition to over the IO-APIC. The | |
461 | kernel tries to set a sensible default. | |
462 | ||
463 | hpet= [X86-32,HPET] option to control HPET usage | |
464 | Format: { enable (default) | disable | force } | |
465 | disable: disable HPET and use PIT instead | |
466 | force: allow force enabled of undocumented chips (ICH4, | |
467 | VIA, nVidia) | |
468 | ||
469 | com20020= [HW,NET] ARCnet - COM20020 chipset | |
470 | Format: | |
471 | <io>[,<irq>[,<nodeID>[,<backplane>[,<ckp>[,<timeout>]]]]] | |
472 | ||
473 | com90io= [HW,NET] ARCnet - COM90xx chipset (IO-mapped buffers) | |
474 | Format: <io>[,<irq>] | |
475 | ||
476 | com90xx= [HW,NET] | |
477 | ARCnet - COM90xx chipset (memory-mapped buffers) | |
478 | Format: <io>[,<irq>[,<memstart>]] | |
479 | ||
480 | condev= [HW,S390] console device | |
481 | conmode= | |
482 | ||
483 | console= [KNL] Output console device and options. | |
484 | ||
485 | tty<n> Use the virtual console device <n>. | |
486 | ||
487 | ttyS<n>[,options] | |
488 | ttyUSB0[,options] | |
489 | Use the specified serial port. The options are of | |
490 | the form "bbbbpnf", where "bbbb" is the baud rate, | |
491 | "p" is parity ("n", "o", or "e"), "n" is number of | |
492 | bits, and "f" is flow control ("r" for RTS or | |
493 | omit it). Default is "9600n8". | |
494 | ||
495 | See Documentation/serial-console.txt for more | |
496 | information. See | |
497 | Documentation/networking/netconsole.txt for an | |
498 | alternative. | |
499 | ||
500 | uart[8250],io,<addr>[,options] | |
501 | uart[8250],mmio,<addr>[,options] | |
502 | Start an early, polled-mode console on the 8250/16550 | |
503 | UART at the specified I/O port or MMIO address, | |
504 | switching to the matching ttyS device later. The | |
505 | options are the same as for ttyS, above. | |
506 | ||
507 | If the device connected to the port is not a TTY but a braille | |
508 | device, prepend "brl," before the device type, for instance | |
509 | console=brl,ttyS0 | |
510 | For now, only VisioBraille is supported. | |
511 | ||
512 | earlycon= [KNL] Output early console device and options. | |
513 | uart[8250],io,<addr>[,options] | |
514 | uart[8250],mmio,<addr>[,options] | |
515 | Start an early, polled-mode console on the 8250/16550 | |
516 | UART at the specified I/O port or MMIO address. | |
517 | The options are the same as for ttyS, above. | |
518 | ||
519 | no_console_suspend | |
520 | [HW] Never suspend the console | |
521 | Disable suspending of consoles during suspend and | |
522 | hibernate operations. Once disabled, debugging | |
523 | messages can reach various consoles while the rest | |
524 | of the system is being put to sleep (ie, while | |
525 | debugging driver suspend/resume hooks). This may | |
526 | not work reliably with all consoles, but is known | |
527 | to work with serial and VGA consoles. | |
528 | ||
529 | cpcihp_generic= [HW,PCI] Generic port I/O CompactPCI driver | |
530 | Format: | |
531 | <first_slot>,<last_slot>,<port>,<enum_bit>[,<debug>] | |
532 | ||
533 | crashkernel=nn[KMG]@ss[KMG] | |
534 | [KNL] Reserve a chunk of physical memory to | |
535 | hold a kernel to switch to with kexec on panic. | |
536 | ||
537 | crashkernel=range1:size1[,range2:size2,...][@offset] | |
538 | [KNL] Same as above, but depends on the memory | |
539 | in the running system. The syntax of range is | |
540 | start-[end] where start and end are both | |
541 | a memory unit (amount[KMG]). See also | |
542 | Documentation/kdump/kdump.txt for a example. | |
543 | ||
544 | cs4232= [HW,OSS] | |
545 | Format: <io>,<irq>,<dma>,<dma2>,<mpuio>,<mpuirq> | |
546 | ||
547 | cs89x0_dma= [HW,NET] | |
548 | Format: <dma> | |
549 | ||
550 | cs89x0_media= [HW,NET] | |
551 | Format: { rj45 | aui | bnc } | |
552 | ||
553 | dasd= [HW,NET] | |
554 | See header of drivers/s390/block/dasd_devmap.c. | |
555 | ||
556 | db9.dev[2|3]= [HW,JOY] Multisystem joystick support via parallel port | |
557 | (one device per port) | |
558 | Format: <port#>,<type> | |
559 | See also Documentation/input/joystick-parport.txt | |
560 | ||
561 | debug [KNL] Enable kernel debugging (events log level). | |
562 | ||
563 | debug_locks_verbose= | |
564 | [KNL] verbose self-tests | |
565 | Format=<0|1> | |
566 | Print debugging info while doing the locking API | |
567 | self-tests. | |
568 | We default to 0 (no extra messages), setting it to | |
569 | 1 will print _a lot_ more information - normally | |
570 | only useful to kernel developers. | |
571 | ||
572 | debug_objects [KNL] Enable object debugging | |
573 | ||
574 | debugpat [X86] Enable PAT debugging | |
575 | ||
576 | decnet.addr= [HW,NET] | |
577 | Format: <area>[,<node>] | |
578 | See also Documentation/networking/decnet.txt. | |
579 | ||
580 | vt.default_blu= [VT] | |
581 | Format: <blue0>,<blue1>,<blue2>,...,<blue15> | |
582 | Change the default blue palette of the console. | |
583 | This is a 16-member array composed of values | |
584 | ranging from 0-255. | |
585 | ||
586 | vt.default_grn= [VT] | |
587 | Format: <green0>,<green1>,<green2>,...,<green15> | |
588 | Change the default green palette of the console. | |
589 | This is a 16-member array composed of values | |
590 | ranging from 0-255. | |
591 | ||
592 | vt.default_red= [VT] | |
593 | Format: <red0>,<red1>,<red2>,...,<red15> | |
594 | Change the default red palette of the console. | |
595 | This is a 16-member array composed of values | |
596 | ranging from 0-255. | |
597 | ||
598 | vt.default_utf8= | |
599 | [VT] | |
600 | Format=<0|1> | |
601 | Set system-wide default UTF-8 mode for all tty's. | |
602 | Default is 1, i.e. UTF-8 mode is enabled for all | |
603 | newly opened terminals. | |
604 | ||
605 | dhash_entries= [KNL] | |
606 | Set number of hash buckets for dentry cache. | |
607 | ||
608 | digi= [HW,SERIAL] | |
609 | IO parameters + enable/disable command. | |
610 | ||
611 | digiepca= [HW,SERIAL] | |
612 | See drivers/char/README.epca and | |
613 | Documentation/digiepca.txt. | |
614 | ||
615 | disable_mtrr_cleanup [X86] | |
616 | enable_mtrr_cleanup [X86] | |
617 | The kernel tries to adjust MTRR layout from continuous | |
618 | to discrete, to make X server driver able to add WB | |
619 | entry later. This parameter enables/disables that. | |
620 | ||
621 | mtrr_chunk_size=nn[KMG] [X86] | |
622 | used for mtrr cleanup. It is largest continous chunk | |
623 | that could hold holes aka. UC entries. | |
624 | ||
625 | mtrr_gran_size=nn[KMG] [X86] | |
626 | Used for mtrr cleanup. It is granularity of mtrr block. | |
627 | Default is 1. | |
628 | Large value could prevent small alignment from | |
629 | using up MTRRs. | |
630 | ||
631 | mtrr_spare_reg_nr=n [X86] | |
632 | Format: <integer> | |
633 | Range: 0,7 : spare reg number | |
634 | Default : 1 | |
635 | Used for mtrr cleanup. It is spare mtrr entries number. | |
636 | Set to 2 or more if your graphical card needs more. | |
637 | ||
638 | disable_mtrr_trim [X86, Intel and AMD only] | |
639 | By default the kernel will trim any uncacheable | |
640 | memory out of your available memory pool based on | |
641 | MTRR settings. This parameter disables that behavior, | |
642 | possibly causing your machine to run very slowly. | |
643 | ||
644 | dmasound= [HW,OSS] Sound subsystem buffers | |
645 | ||
646 | dscc4.setup= [NET] | |
647 | ||
648 | dtc3181e= [HW,SCSI] | |
649 | ||
650 | earlyprintk= [X86-32,X86-64,SH,BLACKFIN] | |
651 | earlyprintk=vga | |
652 | earlyprintk=serial[,ttySn[,baudrate]] | |
653 | ||
654 | Append ",keep" to not disable it when the real console | |
655 | takes over. | |
656 | ||
657 | Only vga or serial at a time, not both. | |
658 | ||
659 | Currently only ttyS0 and ttyS1 are supported. | |
660 | ||
661 | Interaction with the standard serial driver is not | |
662 | very good. | |
663 | ||
664 | The VGA output is eventually overwritten by the real | |
665 | console. | |
666 | ||
667 | eata= [HW,SCSI] | |
668 | ||
669 | edd= [EDD] | |
670 | Format: {"off" | "on" | "skip[mbr]"} | |
671 | ||
672 | eisa_irq_edge= [PARISC,HW] | |
673 | See header of drivers/parisc/eisa.c. | |
674 | ||
675 | elanfreq= [X86-32] | |
676 | See comment before function elanfreq_setup() in | |
677 | arch/x86/kernel/cpu/cpufreq/elanfreq.c. | |
678 | ||
679 | elevator= [IOSCHED] | |
680 | Format: {"anticipatory" | "cfq" | "deadline" | "noop"} | |
681 | See Documentation/block/as-iosched.txt and | |
682 | Documentation/block/deadline-iosched.txt for details. | |
683 | ||
684 | elfcorehdr= [X86-32, X86_64] | |
685 | Specifies physical address of start of kernel core | |
686 | image elf header. Generally kexec loader will | |
687 | pass this option to capture kernel. | |
688 | See Documentation/kdump/kdump.txt for details. | |
689 | ||
690 | enforcing [SELINUX] Set initial enforcing status. | |
691 | Format: {"0" | "1"} | |
692 | See security/selinux/Kconfig help text. | |
693 | 0 -- permissive (log only, no denials). | |
694 | 1 -- enforcing (deny and log). | |
695 | Default value is 0. | |
696 | Value can be changed at runtime via /selinux/enforce. | |
697 | ||
698 | es1371= [HW,OSS] | |
699 | Format: <spdif>,[<nomix>,[<amplifier>]] | |
700 | See also header of sound/oss/es1371.c. | |
701 | ||
702 | ether= [HW,NET] Ethernet cards parameters | |
703 | This option is obsoleted by the "netdev=" option, which | |
704 | has equivalent usage. See its documentation for details. | |
705 | ||
706 | eurwdt= [HW,WDT] Eurotech CPU-1220/1410 onboard watchdog. | |
707 | Format: <io>[,<irq>] | |
708 | ||
709 | failslab= | |
710 | fail_page_alloc= | |
711 | fail_make_request=[KNL] | |
712 | General fault injection mechanism. | |
713 | Format: <interval>,<probability>,<space>,<times> | |
714 | See also /Documentation/fault-injection/. | |
715 | ||
716 | fd_mcs= [HW,SCSI] | |
717 | See header of drivers/scsi/fd_mcs.c. | |
718 | ||
719 | fdomain= [HW,SCSI] | |
720 | See header of drivers/scsi/fdomain.c. | |
721 | ||
722 | floppy= [HW] | |
723 | See Documentation/floppy.txt. | |
724 | ||
725 | force_pal_cache_flush | |
726 | [IA-64] Avoid check_sal_cache_flush which may hang on | |
727 | buggy SAL_CACHE_FLUSH implementations. Using this | |
728 | parameter will force ia64_sal_cache_flush to call | |
729 | ia64_pal_cache_flush instead of SAL_CACHE_FLUSH. | |
730 | ||
731 | gamecon.map[2|3]= | |
732 | [HW,JOY] Multisystem joystick and NES/SNES/PSX pad | |
733 | support via parallel port (up to 5 devices per port) | |
734 | Format: <port#>,<pad1>,<pad2>,<pad3>,<pad4>,<pad5> | |
735 | See also Documentation/input/joystick-parport.txt | |
736 | ||
737 | gamma= [HW,DRM] | |
738 | ||
739 | gart_fix_e820= [X86_64] disable the fix e820 for K8 GART | |
740 | Format: off | on | |
741 | default: on | |
742 | ||
743 | gdth= [HW,SCSI] | |
744 | See header of drivers/scsi/gdth.c. | |
745 | ||
746 | gpt [EFI] Forces disk with valid GPT signature but | |
747 | invalid Protective MBR to be treated as GPT. | |
748 | ||
749 | gvp11= [HW,SCSI] | |
750 | ||
751 | hashdist= [KNL,NUMA] Large hashes allocated during boot | |
752 | are distributed across NUMA nodes. Defaults on | |
753 | for IA-64, off otherwise. | |
754 | Format: 0 | 1 (for off | on) | |
755 | ||
756 | hcl= [IA-64] SGI's Hardware Graph compatibility layer | |
757 | ||
758 | hd= [EIDE] (E)IDE hard drive subsystem geometry | |
759 | Format: <cyl>,<head>,<sect> | |
760 | ||
761 | highmem=nn[KMG] [KNL,BOOT] forces the highmem zone to have an exact | |
762 | size of <nn>. This works even on boxes that have no | |
763 | highmem otherwise. This also works to reduce highmem | |
764 | size on bigger boxes. | |
765 | ||
766 | highres= [KNL] Enable/disable high resolution timer mode. | |
767 | Valid parameters: "on", "off" | |
768 | Default: "on" | |
769 | ||
770 | hisax= [HW,ISDN] | |
771 | See Documentation/isdn/README.HiSax. | |
772 | ||
773 | hugepages= [HW,X86-32,IA-64] Maximal number of HugeTLB pages. | |
774 | hugepagesz= [HW,IA-64,PPC] The size of the HugeTLB pages. | |
775 | ||
776 | i8042.direct [HW] Put keyboard port into non-translated mode | |
777 | i8042.dumbkbd [HW] Pretend that controller can only read data from | |
778 | keyboard and cannot control its state | |
779 | (Don't attempt to blink the leds) | |
780 | i8042.noaux [HW] Don't check for auxiliary (== mouse) port | |
781 | i8042.nokbd [HW] Don't check/create keyboard port | |
782 | i8042.noloop [HW] Disable the AUX Loopback command while probing | |
783 | for the AUX port | |
784 | i8042.nomux [HW] Don't check presence of an active multiplexing | |
785 | controller | |
786 | i8042.nopnp [HW] Don't use ACPIPnP / PnPBIOS to discover KBD/AUX | |
787 | controllers | |
788 | i8042.panicblink= | |
789 | [HW] Frequency with which keyboard LEDs should blink | |
790 | when kernel panics (default is 0.5 sec) | |
791 | i8042.reset [HW] Reset the controller during init and cleanup | |
792 | i8042.unlock [HW] Unlock (ignore) the keylock | |
793 | ||
794 | i810= [HW,DRM] | |
795 | ||
796 | i8k.ignore_dmi [HW] Continue probing hardware even if DMI data | |
797 | indicates that the driver is running on unsupported | |
798 | hardware. | |
799 | i8k.force [HW] Activate i8k driver even if SMM BIOS signature | |
800 | does not match list of supported models. | |
801 | i8k.power_status | |
802 | [HW] Report power status in /proc/i8k | |
803 | (disabled by default) | |
804 | i8k.restricted [HW] Allow controlling fans only if SYS_ADMIN | |
805 | capability is set. | |
806 | ||
807 | ibmmcascsi= [HW,MCA,SCSI] IBM MicroChannel SCSI adapter | |
808 | See Documentation/mca.txt. | |
809 | ||
810 | icn= [HW,ISDN] | |
811 | Format: <io>[,<membase>[,<icn_id>[,<icn_id2>]]] | |
812 | ||
813 | ide= [HW] (E)IDE subsystem | |
814 | Format: ide=nodma or ide=doubler | |
815 | See Documentation/ide/ide.txt. | |
816 | ||
817 | idebus= [HW] (E)IDE subsystem - VLB/PCI bus speed | |
818 | See Documentation/ide/ide.txt. | |
819 | ||
820 | idle= [X86] | |
821 | Format: idle=poll or idle=mwait | |
822 | Poll forces a polling idle loop that can slightly improves the performance | |
823 | of waking up a idle CPU, but will use a lot of power and make the system | |
824 | run hot. Not recommended. | |
825 | idle=mwait. On systems which support MONITOR/MWAIT but the kernel chose | |
826 | to not use it because it doesn't save as much power as a normal idle | |
827 | loop use the MONITOR/MWAIT idle loop anyways. Performance should be the same | |
828 | as idle=poll. | |
829 | ||
830 | ide-pci-generic.all-generic-ide [HW] (E)IDE subsystem | |
831 | Claim all unknown PCI IDE storage controllers. | |
832 | ||
833 | ignore_loglevel [KNL] | |
834 | Ignore loglevel setting - this will print /all/ | |
835 | kernel messages to the console. Useful for debugging. | |
836 | ||
837 | ihash_entries= [KNL] | |
838 | Set number of hash buckets for inode cache. | |
839 | ||
840 | in2000= [HW,SCSI] | |
841 | See header of drivers/scsi/in2000.c. | |
842 | ||
843 | init= [KNL] | |
844 | Format: <full_path> | |
845 | Run specified binary instead of /sbin/init as init | |
846 | process. | |
847 | ||
848 | initcall_debug [KNL] Trace initcalls as they are executed. Useful | |
849 | for working out where the kernel is dying during | |
850 | startup. | |
851 | ||
852 | initrd= [BOOT] Specify the location of the initial ramdisk | |
853 | ||
854 | inport.irq= [HW] Inport (ATI XL and Microsoft) busmouse driver | |
855 | Format: <irq> | |
856 | ||
857 | inttest= [IA64] | |
858 | ||
859 | iommu= [x86] | |
860 | off | |
861 | force | |
862 | noforce | |
863 | biomerge | |
864 | panic | |
865 | nopanic | |
866 | merge | |
867 | nomerge | |
868 | forcesac | |
869 | soft | |
870 | ||
871 | ||
872 | intel_iommu= [DMAR] Intel IOMMU driver (DMAR) option | |
873 | off | |
874 | Disable intel iommu driver. | |
875 | igfx_off [Default Off] | |
876 | By default, gfx is mapped as normal device. If a gfx | |
877 | device has a dedicated DMAR unit, the DMAR unit is | |
878 | bypassed by not enabling DMAR with this option. In | |
879 | this case, gfx device will use physical address for | |
880 | DMA. | |
881 | forcedac [x86_64] | |
882 | With this option iommu will not optimize to look | |
883 | for io virtual address below 32 bit forcing dual | |
884 | address cycle on pci bus for cards supporting greater | |
885 | than 32 bit addressing. The default is to look | |
886 | for translation below 32 bit and if not available | |
887 | then look in the higher range. | |
888 | strict [Default Off] | |
889 | With this option on every unmap_single operation will | |
890 | result in a hardware IOTLB flush operation as opposed | |
891 | to batching them for performance. | |
892 | ||
893 | io_delay= [X86-32,X86-64] I/O delay method | |
894 | 0x80 | |
895 | Standard port 0x80 based delay | |
896 | 0xed | |
897 | Alternate port 0xed based delay (needed on some systems) | |
898 | udelay | |
899 | Simple two microseconds delay | |
900 | none | |
901 | No delay | |
902 | ||
903 | io7= [HW] IO7 for Marvel based alpha systems | |
904 | See comment before marvel_specify_io7 in | |
905 | arch/alpha/kernel/core_marvel.c. | |
906 | ||
907 | ip= [IP_PNP] | |
908 | See Documentation/filesystems/nfsroot.txt. | |
909 | ||
910 | ip2= [HW] Set IO/IRQ pairs for up to 4 IntelliPort boards | |
911 | See comment before ip2_setup() in | |
912 | drivers/char/ip2/ip2base.c. | |
913 | ||
914 | ips= [HW,SCSI] Adaptec / IBM ServeRAID controller | |
915 | See header of drivers/scsi/ips.c. | |
916 | ||
917 | ports= [IP_VS_FTP] IPVS ftp helper module | |
918 | Default is 21. | |
919 | Up to 8 (IP_VS_APP_MAX_PORTS) ports | |
920 | may be specified. | |
921 | Format: <port>,<port>.... | |
922 | ||
923 | irqfixup [HW] | |
924 | When an interrupt is not handled search all handlers | |
925 | for it. Intended to get systems with badly broken | |
926 | firmware running. | |
927 | ||
928 | irqpoll [HW] | |
929 | When an interrupt is not handled search all handlers | |
930 | for it. Also check all handlers each timer | |
931 | interrupt. Intended to get systems with badly broken | |
932 | firmware running. | |
933 | ||
934 | isapnp= [ISAPNP] | |
935 | Format: <RDP>,<reset>,<pci_scan>,<verbosity> | |
936 | ||
937 | isolcpus= [KNL,SMP] Isolate CPUs from the general scheduler. | |
938 | Format: | |
939 | <cpu number>,...,<cpu number> | |
940 | or | |
941 | <cpu number>-<cpu number> (must be a positive range in ascending order) | |
942 | or a mixture | |
943 | <cpu number>,...,<cpu number>-<cpu number> | |
944 | This option can be used to specify one or more CPUs | |
945 | to isolate from the general SMP balancing and scheduling | |
946 | algorithms. The only way to move a process onto or off | |
947 | an "isolated" CPU is via the CPU affinity syscalls. | |
948 | <cpu number> begins at 0 and the maximum value is | |
949 | "number of CPUs in system - 1". | |
950 | ||
951 | This option is the preferred way to isolate CPUs. The | |
952 | alternative -- manually setting the CPU mask of all | |
953 | tasks in the system -- can cause problems and | |
954 | suboptimal load balancer performance. | |
955 | ||
956 | iucv= [HW,NET] | |
957 | ||
958 | js= [HW,JOY] Analog joystick | |
959 | See Documentation/input/joystick.txt. | |
960 | ||
961 | kernelcore=nn[KMG] [KNL,X86-32,IA-64,PPC,X86-64] This parameter | |
962 | specifies the amount of memory usable by the kernel | |
963 | for non-movable allocations. The requested amount is | |
964 | spread evenly throughout all nodes in the system. The | |
965 | remaining memory in each node is used for Movable | |
966 | pages. In the event, a node is too small to have both | |
967 | kernelcore and Movable pages, kernelcore pages will | |
968 | take priority and other nodes will have a larger number | |
969 | of kernelcore pages. The Movable zone is used for the | |
970 | allocation of pages that may be reclaimed or moved | |
971 | by the page migration subsystem. This means that | |
972 | HugeTLB pages may not be allocated from this zone. | |
973 | Note that allocations like PTEs-from-HighMem still | |
974 | use the HighMem zone if it exists, and the Normal | |
975 | zone if it does not. | |
976 | ||
977 | movablecore=nn[KMG] [KNL,X86-32,IA-64,PPC,X86-64] This parameter | |
978 | is similar to kernelcore except it specifies the | |
979 | amount of memory used for migratable allocations. | |
980 | If both kernelcore and movablecore is specified, | |
981 | then kernelcore will be at *least* the specified | |
982 | value but may be more. If movablecore on its own | |
983 | is specified, the administrator must be careful | |
984 | that the amount of memory usable for all allocations | |
985 | is not too small. | |
986 | ||
987 | keepinitrd [HW,ARM] | |
988 | ||
989 | kstack=N [X86-32,X86-64] Print N words from the kernel stack | |
990 | in oops dumps. | |
991 | ||
992 | kgdboc= [HW] kgdb over consoles. | |
993 | Requires a tty driver that supports console polling. | |
994 | (only serial suported for now) | |
995 | Format: <serial_device>[,baud] | |
996 | ||
997 | l2cr= [PPC] | |
998 | ||
999 | l3cr= [PPC] | |
1000 | ||
1001 | lapic [X86-32,APIC] Enable the local APIC even if BIOS | |
1002 | disabled it. | |
1003 | ||
1004 | lapic_timer_c2_ok [X86-32,x86-64,APIC] trust the local apic timer in | |
1005 | C2 power state. | |
1006 | ||
1007 | libata.dma= [LIBATA] DMA control | |
1008 | libata.dma=0 Disable all PATA and SATA DMA | |
1009 | libata.dma=1 PATA and SATA Disk DMA only | |
1010 | libata.dma=2 ATAPI (CDROM) DMA only | |
1011 | libata.dma=4 Compact Flash DMA only | |
1012 | Combinations also work, so libata.dma=3 enables DMA | |
1013 | for disks and CDROMs, but not CFs. | |
1014 | ||
1015 | libata.noacpi [LIBATA] Disables use of ACPI in libata suspend/resume | |
1016 | when set. | |
1017 | Format: <int> | |
1018 | ||
1019 | libata.force= [LIBATA] Force configurations. The format is comma | |
1020 | separated list of "[ID:]VAL" where ID is | |
1021 | PORT[:DEVICE]. PORT and DEVICE are decimal numbers | |
1022 | matching port, link or device. Basically, it matches | |
1023 | the ATA ID string printed on console by libata. If | |
1024 | the whole ID part is omitted, the last PORT and DEVICE | |
1025 | values are used. If ID hasn't been specified yet, the | |
1026 | configuration applies to all ports, links and devices. | |
1027 | ||
1028 | If only DEVICE is omitted, the parameter applies to | |
1029 | the port and all links and devices behind it. DEVICE | |
1030 | number of 0 either selects the first device or the | |
1031 | first fan-out link behind PMP device. It does not | |
1032 | select the host link. DEVICE number of 15 selects the | |
1033 | host link and device attached to it. | |
1034 | ||
1035 | The VAL specifies the configuration to force. As long | |
1036 | as there's no ambiguity shortcut notation is allowed. | |
1037 | For example, both 1.5 and 1.5G would work for 1.5Gbps. | |
1038 | The following configurations can be forced. | |
1039 | ||
1040 | * Cable type: 40c, 80c, short40c, unk, ign or sata. | |
1041 | Any ID with matching PORT is used. | |
1042 | ||
1043 | * SATA link speed limit: 1.5Gbps or 3.0Gbps. | |
1044 | ||
1045 | * Transfer mode: pio[0-7], mwdma[0-4] and udma[0-7]. | |
1046 | udma[/][16,25,33,44,66,100,133] notation is also | |
1047 | allowed. | |
1048 | ||
1049 | * [no]ncq: Turn on or off NCQ. | |
1050 | ||
1051 | If there are multiple matching configurations changing | |
1052 | the same attribute, the last one is used. | |
1053 | ||
1054 | load_ramdisk= [RAM] List of ramdisks to load from floppy | |
1055 | See Documentation/ramdisk.txt. | |
1056 | ||
1057 | lockd.nlm_grace_period=P [NFS] Assign grace period. | |
1058 | Format: <integer> | |
1059 | ||
1060 | lockd.nlm_tcpport=N [NFS] Assign TCP port. | |
1061 | Format: <integer> | |
1062 | ||
1063 | lockd.nlm_timeout=T [NFS] Assign timeout value. | |
1064 | Format: <integer> | |
1065 | ||
1066 | lockd.nlm_udpport=M [NFS] Assign UDP port. | |
1067 | Format: <integer> | |
1068 | ||
1069 | logibm.irq= [HW,MOUSE] Logitech Bus Mouse Driver | |
1070 | Format: <irq> | |
1071 | ||
1072 | loglevel= All Kernel Messages with a loglevel smaller than the | |
1073 | console loglevel will be printed to the console. It can | |
1074 | also be changed with klogd or other programs. The | |
1075 | loglevels are defined as follows: | |
1076 | ||
1077 | 0 (KERN_EMERG) system is unusable | |
1078 | 1 (KERN_ALERT) action must be taken immediately | |
1079 | 2 (KERN_CRIT) critical conditions | |
1080 | 3 (KERN_ERR) error conditions | |
1081 | 4 (KERN_WARNING) warning conditions | |
1082 | 5 (KERN_NOTICE) normal but significant condition | |
1083 | 6 (KERN_INFO) informational | |
1084 | 7 (KERN_DEBUG) debug-level messages | |
1085 | ||
1086 | log_buf_len=n Sets the size of the printk ring buffer, in bytes. | |
1087 | Format: { n | nk | nM } | |
1088 | n must be a power of two. The default size | |
1089 | is set in the kernel config file. | |
1090 | ||
1091 | logo.nologo [FB] Disables display of the built-in Linux logo. | |
1092 | This may be used to provide more screen space for | |
1093 | kernel log messages and is useful when debugging | |
1094 | kernel boot problems. | |
1095 | ||
1096 | lp=0 [LP] Specify parallel ports to use, e.g, | |
1097 | lp=port[,port...] lp=none,parport0 (lp0 not configured, lp1 uses | |
1098 | lp=reset first parallel port). 'lp=0' disables the | |
1099 | lp=auto printer driver. 'lp=reset' (which can be | |
1100 | specified in addition to the ports) causes | |
1101 | attached printers to be reset. Using | |
1102 | lp=port1,port2,... specifies the parallel ports | |
1103 | to associate lp devices with, starting with | |
1104 | lp0. A port specification may be 'none' to skip | |
1105 | that lp device, or a parport name such as | |
1106 | 'parport0'. Specifying 'lp=auto' instead of a | |
1107 | port specification list means that device IDs | |
1108 | from each port should be examined, to see if | |
1109 | an IEEE 1284-compliant printer is attached; if | |
1110 | so, the driver will manage that printer. | |
1111 | See also header of drivers/char/lp.c. | |
1112 | ||
1113 | lpj=n [KNL] | |
1114 | Sets loops_per_jiffy to given constant, thus avoiding | |
1115 | time-consuming boot-time autodetection (up to 250 ms per | |
1116 | CPU). 0 enables autodetection (default). To determine | |
1117 | the correct value for your kernel, boot with normal | |
1118 | autodetection and see what value is printed. Note that | |
1119 | on SMP systems the preset will be applied to all CPUs, | |
1120 | which is likely to cause problems if your CPUs need | |
1121 | significantly divergent settings. An incorrect value | |
1122 | will cause delays in the kernel to be wrong, leading to | |
1123 | unpredictable I/O errors and other breakage. Although | |
1124 | unlikely, in the extreme case this might damage your | |
1125 | hardware. | |
1126 | ||
1127 | ltpc= [NET] | |
1128 | Format: <io>,<irq>,<dma> | |
1129 | ||
1130 | mac5380= [HW,SCSI] Format: | |
1131 | <can_queue>,<cmd_per_lun>,<sg_tablesize>,<hostid>,<use_tags> | |
1132 | ||
1133 | machvec= [IA64] Force the use of a particular machine-vector | |
1134 | (machvec) in a generic kernel. | |
1135 | Example: machvec=hpzx1_swiotlb | |
1136 | ||
1137 | max_loop= [LOOP] Maximum number of loopback devices that can | |
1138 | be mounted | |
1139 | Format: <1-256> | |
1140 | ||
1141 | maxcpus= [SMP] Maximum number of processors that an SMP kernel | |
1142 | should make use of. maxcpus=n : n >= 0 limits the | |
1143 | kernel to using 'n' processors. n=0 is a special case, | |
1144 | it is equivalent to "nosmp", which also disables | |
1145 | the IO APIC. | |
1146 | ||
1147 | max_addr=[KMG] [KNL,BOOT,ia64] All physical memory greater than or | |
1148 | equal to this physical address is ignored. | |
1149 | ||
1150 | max_luns= [SCSI] Maximum number of LUNs to probe. | |
1151 | Should be between 1 and 2^32-1. | |
1152 | ||
1153 | max_report_luns= | |
1154 | [SCSI] Maximum number of LUNs received. | |
1155 | Should be between 1 and 16384. | |
1156 | ||
1157 | mcatest= [IA-64] | |
1158 | ||
1159 | mce [X86-32] Machine Check Exception | |
1160 | ||
1161 | mce=option [X86-64] See Documentation/x86_64/boot-options.txt | |
1162 | ||
1163 | md= [HW] RAID subsystems devices and level | |
1164 | See Documentation/md.txt. | |
1165 | ||
1166 | mdacon= [MDA] | |
1167 | Format: <first>,<last> | |
1168 | Specifies range of consoles to be captured by the MDA. | |
1169 | ||
1170 | mem=nn[KMG] [KNL,BOOT] Force usage of a specific amount of memory | |
1171 | Amount of memory to be used when the kernel is not able | |
1172 | to see the whole system memory or for test. | |
1173 | [X86-32] Use together with memmap= to avoid physical | |
1174 | address space collisions. Without memmap= PCI devices | |
1175 | could be placed at addresses belonging to unused RAM. | |
1176 | ||
1177 | mem=nopentium [BUGS=X86-32] Disable usage of 4MB pages for kernel | |
1178 | memory. | |
1179 | ||
1180 | memmap=exactmap [KNL,X86-32,X86_64] Enable setting of an exact | |
1181 | E820 memory map, as specified by the user. | |
1182 | Such memmap=exactmap lines can be constructed based on | |
1183 | BIOS output or other requirements. See the memmap=nn@ss | |
1184 | option description. | |
1185 | ||
1186 | memmap=nn[KMG]@ss[KMG] | |
1187 | [KNL] Force usage of a specific region of memory | |
1188 | Region of memory to be used, from ss to ss+nn. | |
1189 | ||
1190 | memmap=nn[KMG]#ss[KMG] | |
1191 | [KNL,ACPI] Mark specific memory as ACPI data. | |
1192 | Region of memory to be used, from ss to ss+nn. | |
1193 | ||
1194 | memmap=nn[KMG]$ss[KMG] | |
1195 | [KNL,ACPI] Mark specific memory as reserved. | |
1196 | Region of memory to be used, from ss to ss+nn. | |
1197 | Example: Exclude memory from 0x18690000-0x1869ffff | |
1198 | memmap=64K$0x18690000 | |
1199 | or | |
1200 | memmap=0x10000$0x18690000 | |
1201 | ||
1202 | memtest= [KNL,X86_64] Enable memtest | |
1203 | Format: <integer> | |
1204 | range: 0,4 : pattern number | |
1205 | default : 0 <disable> | |
1206 | ||
1207 | meye.*= [HW] Set MotionEye Camera parameters | |
1208 | See Documentation/video4linux/meye.txt. | |
1209 | ||
1210 | mfgpt_irq= [IA-32] Specify the IRQ to use for the | |
1211 | Multi-Function General Purpose Timers on AMD Geode | |
1212 | platforms. | |
1213 | ||
1214 | mfgptfix [X86-32] Fix MFGPT timers on AMD Geode platforms when | |
1215 | the BIOS has incorrectly applied a workaround. TinyBIOS | |
1216 | version 0.98 is known to be affected, 0.99 fixes the | |
1217 | problem by letting the user disable the workaround. | |
1218 | ||
1219 | mga= [HW,DRM] | |
1220 | ||
1221 | mousedev.tap_time= | |
1222 | [MOUSE] Maximum time between finger touching and | |
1223 | leaving touchpad surface for touch to be considered | |
1224 | a tap and be reported as a left button click (for | |
1225 | touchpads working in absolute mode only). | |
1226 | Format: <msecs> | |
1227 | mousedev.xres= [MOUSE] Horizontal screen resolution, used for devices | |
1228 | reporting absolute coordinates, such as tablets | |
1229 | mousedev.yres= [MOUSE] Vertical screen resolution, used for devices | |
1230 | reporting absolute coordinates, such as tablets | |
1231 | ||
1232 | mpu401= [HW,OSS] | |
1233 | Format: <io>,<irq> | |
1234 | ||
1235 | MTD_Partition= [MTD] | |
1236 | Format: <name>,<region-number>,<size>,<offset> | |
1237 | ||
1238 | MTD_Region= [MTD] Format: | |
1239 | <name>,<region-number>[,<base>,<size>,<buswidth>,<altbuswidth>] | |
1240 | ||
1241 | mtdparts= [MTD] | |
1242 | See drivers/mtd/cmdlinepart.c. | |
1243 | ||
1244 | mtdset= [ARM] | |
1245 | ARM/S3C2412 JIVE boot control | |
1246 | ||
1247 | See arch/arm/mach-s3c2412/mach-jive.c | |
1248 | ||
1249 | mtouchusb.raw_coordinates= | |
1250 | [HW] Make the MicroTouch USB driver use raw coordinates | |
1251 | ('y', default) or cooked coordinates ('n') | |
1252 | ||
1253 | n2= [NET] SDL Inc. RISCom/N2 synchronous serial card | |
1254 | ||
1255 | NCR_D700= [HW,SCSI] | |
1256 | See header of drivers/scsi/NCR_D700.c. | |
1257 | ||
1258 | ncr5380= [HW,SCSI] | |
1259 | ||
1260 | ncr53c400= [HW,SCSI] | |
1261 | ||
1262 | ncr53c400a= [HW,SCSI] | |
1263 | ||
1264 | ncr53c406a= [HW,SCSI] | |
1265 | ||
1266 | ncr53c8xx= [HW,SCSI] | |
1267 | ||
1268 | netdev= [NET] Network devices parameters | |
1269 | Format: <irq>,<io>,<mem_start>,<mem_end>,<name> | |
1270 | Note that mem_start is often overloaded to mean | |
1271 | something different and driver-specific. | |
1272 | This usage is only documented in each driver source | |
1273 | file if at all. | |
1274 | ||
1275 | nfsaddrs= [NFS] | |
1276 | See Documentation/filesystems/nfsroot.txt. | |
1277 | ||
1278 | nfsroot= [NFS] nfs root filesystem for disk-less boxes. | |
1279 | See Documentation/filesystems/nfsroot.txt. | |
1280 | ||
1281 | nfs.callback_tcpport= | |
1282 | [NFS] set the TCP port on which the NFSv4 callback | |
1283 | channel should listen. | |
1284 | ||
1285 | nfs.idmap_cache_timeout= | |
1286 | [NFS] set the maximum lifetime for idmapper cache | |
1287 | entries. | |
1288 | ||
1289 | nfs.enable_ino64= | |
1290 | [NFS] enable 64-bit inode numbers. | |
1291 | If zero, the NFS client will fake up a 32-bit inode | |
1292 | number for the readdir() and stat() syscalls instead | |
1293 | of returning the full 64-bit number. | |
1294 | The default is to return 64-bit inode numbers. | |
1295 | ||
1296 | nmi_debug= [KNL,AVR32] Specify one or more actions to take | |
1297 | when a NMI is triggered. | |
1298 | Format: [state][,regs][,debounce][,die] | |
1299 | ||
1300 | nmi_watchdog= [KNL,BUGS=X86-32] Debugging features for SMP kernels | |
1301 | ||
1302 | no387 [BUGS=X86-32] Tells the kernel to use the 387 maths | |
1303 | emulation library even if a 387 maths coprocessor | |
1304 | is present. | |
1305 | ||
1306 | noaliencache [MM, NUMA, SLAB] Disables the allocation of alien | |
1307 | caches in the slab allocator. Saves per-node memory, | |
1308 | but will impact performance. | |
1309 | ||
1310 | noalign [KNL,ARM] | |
1311 | ||
1312 | noapic [SMP,APIC] Tells the kernel to not make use of any | |
1313 | IOAPICs that may be present in the system. | |
1314 | ||
1315 | nobats [PPC] Do not use BATs for mapping kernel lowmem | |
1316 | on "Classic" PPC cores. | |
1317 | ||
1318 | nocache [ARM] | |
1319 | ||
1320 | nodelayacct [KNL] Disable per-task delay accounting | |
1321 | ||
1322 | nodisconnect [HW,SCSI,M68K] Disables SCSI disconnects. | |
1323 | ||
1324 | noefi [X86-32,X86-64] Disable EFI runtime services support. | |
1325 | ||
1326 | noexec [IA-64] | |
1327 | ||
1328 | noexec [X86-32,X86-64] | |
1329 | On X86-32 available only on PAE configured kernels. | |
1330 | noexec=on: enable non-executable mappings (default) | |
1331 | noexec=off: disable non-executable mappings | |
1332 | ||
1333 | noexec32 [X86-64] | |
1334 | This affects only 32-bit executables. | |
1335 | noexec32=on: enable non-executable mappings (default) | |
1336 | read doesn't imply executable mappings | |
1337 | noexec32=off: disable non-executable mappings | |
1338 | read implies executable mappings | |
1339 | ||
1340 | nofxsr [BUGS=X86-32] Disables x86 floating point extended | |
1341 | register save and restore. The kernel will only save | |
1342 | legacy floating-point registers on task switch. | |
1343 | ||
1344 | noclflush [BUGS=X86] Don't use the CLFLUSH instruction | |
1345 | ||
1346 | nohlt [BUGS=ARM] | |
1347 | ||
1348 | no-hlt [BUGS=X86-32] Tells the kernel that the hlt | |
1349 | instruction doesn't work correctly and not to | |
1350 | use it. | |
1351 | ||
1352 | nohalt [IA-64] Tells the kernel not to use the power saving | |
1353 | function PAL_HALT_LIGHT when idle. This increases | |
1354 | power-consumption. On the positive side, it reduces | |
1355 | interrupt wake-up latency, which may improve performance | |
1356 | in certain environments such as networked servers or | |
1357 | real-time systems. | |
1358 | ||
1359 | nohz= [KNL] Boottime enable/disable dynamic ticks | |
1360 | Valid arguments: on, off | |
1361 | Default: on | |
1362 | ||
1363 | noirqbalance [X86-32,SMP,KNL] Disable kernel irq balancing | |
1364 | ||
1365 | noirqdebug [X86-32] Disables the code which attempts to detect and | |
1366 | disable unhandled interrupt sources. | |
1367 | ||
1368 | no_timer_check [X86-32,X86_64,APIC] Disables the code which tests for | |
1369 | broken timer IRQ sources. | |
1370 | ||
1371 | noisapnp [ISAPNP] Disables ISA PnP code. | |
1372 | ||
1373 | noinitrd [RAM] Tells the kernel not to load any configured | |
1374 | initial RAM disk. | |
1375 | ||
1376 | nointroute [IA-64] | |
1377 | ||
1378 | nojitter [IA64] Disables jitter checking for ITC timers. | |
1379 | ||
1380 | nolapic [X86-32,APIC] Do not enable or use the local APIC. | |
1381 | ||
1382 | nolapic_timer [X86-32,APIC] Do not use the local APIC timer. | |
1383 | ||
1384 | noltlbs [PPC] Do not use large page/tlb entries for kernel | |
1385 | lowmem mapping on PPC40x. | |
1386 | ||
1387 | nomca [IA-64] Disable machine check abort handling | |
1388 | ||
1389 | nomce [X86-32] Machine Check Exception | |
1390 | ||
1391 | nomfgpt [X86-32] Disable Multi-Function General Purpose | |
1392 | Timer usage (for AMD Geode machines). | |
1393 | ||
1394 | noreplace-paravirt [X86-32,PV_OPS] Don't patch paravirt_ops | |
1395 | ||
1396 | noreplace-smp [X86-32,SMP] Don't replace SMP instructions | |
1397 | with UP alternatives | |
1398 | ||
1399 | noresidual [PPC] Don't use residual data on PReP machines. | |
1400 | ||
1401 | noresume [SWSUSP] Disables resume and restores original swap | |
1402 | space. | |
1403 | ||
1404 | no-scroll [VGA] Disables scrollback. | |
1405 | This is required for the Braillex ib80-piezo Braille | |
1406 | reader made by F.H. Papenmeier (Germany). | |
1407 | ||
1408 | nosbagart [IA-64] | |
1409 | ||
1410 | nosep [BUGS=X86-32] Disables x86 SYSENTER/SYSEXIT support. | |
1411 | ||
1412 | nosmp [SMP] Tells an SMP kernel to act as a UP kernel, | |
1413 | and disable the IO APIC. legacy for "maxcpus=0". | |
1414 | ||
1415 | nosoftlockup [KNL] Disable the soft-lockup detector. | |
1416 | ||
1417 | nosync [HW,M68K] Disables sync negotiation for all devices. | |
1418 | ||
1419 | notsc [BUGS=X86-32] Disable Time Stamp Counter | |
1420 | ||
1421 | nousb [USB] Disable the USB subsystem | |
1422 | ||
1423 | nowb [ARM] | |
1424 | ||
1425 | nptcg= [IA64] Override max number of concurrent global TLB | |
1426 | purges which is reported from either PAL_VM_SUMMARY or | |
1427 | SAL PALO. | |
1428 | ||
1429 | numa_zonelist_order= [KNL, BOOT] Select zonelist order for NUMA. | |
1430 | one of ['zone', 'node', 'default'] can be specified | |
1431 | This can be set from sysctl after boot. | |
1432 | See Documentation/sysctl/vm.txt for details. | |
1433 | ||
1434 | nr_uarts= [SERIAL] maximum number of UARTs to be registered. | |
1435 | ||
1436 | olpc_ec_timeout= [OLPC] ms delay when issuing EC commands | |
1437 | Rather than timing out after 20 ms if an EC | |
1438 | command is not properly ACKed, override the length | |
1439 | of the timeout. We have interrupts disabled while | |
1440 | waiting for the ACK, so if this is set too high | |
1441 | interrupts *may* be lost! | |
1442 | ||
1443 | opl3= [HW,OSS] | |
1444 | Format: <io> | |
1445 | ||
1446 | oprofile.timer= [HW] | |
1447 | Use timer interrupt instead of performance counters | |
1448 | ||
1449 | osst= [HW,SCSI] SCSI Tape Driver | |
1450 | Format: <buffer_size>,<write_threshold> | |
1451 | See also Documentation/scsi/st.txt. | |
1452 | ||
1453 | panic= [KNL] Kernel behaviour on panic | |
1454 | Format: <timeout> | |
1455 | ||
1456 | parkbd.port= [HW] Parallel port number the keyboard adapter is | |
1457 | connected to, default is 0. | |
1458 | Format: <parport#> | |
1459 | parkbd.mode= [HW] Parallel port keyboard adapter mode of operation, | |
1460 | 0 for XT, 1 for AT (default is AT). | |
1461 | Format: <mode> | |
1462 | ||
1463 | parport= [HW,PPT] Specify parallel ports. 0 disables. | |
1464 | Format: { 0 | auto | 0xBBB[,IRQ[,DMA]] } | |
1465 | Use 'auto' to force the driver to use any | |
1466 | IRQ/DMA settings detected (the default is to | |
1467 | ignore detected IRQ/DMA settings because of | |
1468 | possible conflicts). You can specify the base | |
1469 | address, IRQ, and DMA settings; IRQ and DMA | |
1470 | should be numbers, or 'auto' (for using detected | |
1471 | settings on that particular port), or 'nofifo' | |
1472 | (to avoid using a FIFO even if it is detected). | |
1473 | Parallel ports are assigned in the order they | |
1474 | are specified on the command line, starting | |
1475 | with parport0. | |
1476 | ||
1477 | parport_init_mode= [HW,PPT] | |
1478 | Configure VIA parallel port to operate in | |
1479 | a specific mode. This is necessary on Pegasos | |
1480 | computer where firmware has no options for setting | |
1481 | up parallel port mode and sets it to spp. | |
1482 | Currently this function knows 686a and 8231 chips. | |
1483 | Format: [spp|ps2|epp|ecp|ecpepp] | |
1484 | ||
1485 | pas2= [HW,OSS] Format: | |
1486 | <io>,<irq>,<dma>,<dma16>,<sb_io>,<sb_irq>,<sb_dma>,<sb_dma16> | |
1487 | ||
1488 | pas16= [HW,SCSI] | |
1489 | See header of drivers/scsi/pas16.c. | |
1490 | ||
1491 | pause_on_oops= | |
1492 | Halt all CPUs after the first oops has been printed for | |
1493 | the specified number of seconds. This is to be used if | |
1494 | your oopses keep scrolling off the screen. | |
1495 | ||
1496 | pcbit= [HW,ISDN] | |
1497 | ||
1498 | pcd. [PARIDE] | |
1499 | See header of drivers/block/paride/pcd.c. | |
1500 | See also Documentation/paride.txt. | |
1501 | ||
1502 | pci=option[,option...] [PCI] various PCI subsystem options: | |
1503 | off [X86-32] don't probe for the PCI bus | |
1504 | bios [X86-32] force use of PCI BIOS, don't access | |
1505 | the hardware directly. Use this if your machine | |
1506 | has a non-standard PCI host bridge. | |
1507 | nobios [X86-32] disallow use of PCI BIOS, only direct | |
1508 | hardware access methods are allowed. Use this | |
1509 | if you experience crashes upon bootup and you | |
1510 | suspect they are caused by the BIOS. | |
1511 | conf1 [X86-32] Force use of PCI Configuration | |
1512 | Mechanism 1. | |
1513 | conf2 [X86-32] Force use of PCI Configuration | |
1514 | Mechanism 2. | |
1515 | noaer [PCIE] If the PCIEAER kernel config parameter is | |
1516 | enabled, this kernel boot option can be used to | |
1517 | disable the use of PCIE advanced error reporting. | |
1518 | nodomains [PCI] Disable support for multiple PCI | |
1519 | root domains (aka PCI segments, in ACPI-speak). | |
1520 | nommconf [X86-32,X86_64] Disable use of MMCONFIG for PCI | |
1521 | Configuration | |
1522 | nomsi [MSI] If the PCI_MSI kernel config parameter is | |
1523 | enabled, this kernel boot option can be used to | |
1524 | disable the use of MSI interrupts system-wide. | |
1525 | biosirq [X86-32] Use PCI BIOS calls to get the interrupt | |
1526 | routing table. These calls are known to be buggy | |
1527 | on several machines and they hang the machine | |
1528 | when used, but on other computers it's the only | |
1529 | way to get the interrupt routing table. Try | |
1530 | this option if the kernel is unable to allocate | |
1531 | IRQs or discover secondary PCI buses on your | |
1532 | motherboard. | |
1533 | rom [X86-32] Assign address space to expansion ROMs. | |
1534 | Use with caution as certain devices share | |
1535 | address decoders between ROMs and other | |
1536 | resources. | |
1537 | irqmask=0xMMMM [X86-32] Set a bit mask of IRQs allowed to be | |
1538 | assigned automatically to PCI devices. You can | |
1539 | make the kernel exclude IRQs of your ISA cards | |
1540 | this way. | |
1541 | pirqaddr=0xAAAAA [X86-32] Specify the physical address | |
1542 | of the PIRQ table (normally generated | |
1543 | by the BIOS) if it is outside the | |
1544 | F0000h-100000h range. | |
1545 | lastbus=N [X86-32] Scan all buses thru bus #N. Can be | |
1546 | useful if the kernel is unable to find your | |
1547 | secondary buses and you want to tell it | |
1548 | explicitly which ones they are. | |
1549 | assign-busses [X86-32] Always assign all PCI bus | |
1550 | numbers ourselves, overriding | |
1551 | whatever the firmware may have done. | |
1552 | usepirqmask [X86-32] Honor the possible IRQ mask stored | |
1553 | in the BIOS $PIR table. This is needed on | |
1554 | some systems with broken BIOSes, notably | |
1555 | some HP Pavilion N5400 and Omnibook XE3 | |
1556 | notebooks. This will have no effect if ACPI | |
1557 | IRQ routing is enabled. | |
1558 | noacpi [X86-32] Do not use ACPI for IRQ routing | |
1559 | or for PCI scanning. | |
1560 | use_crs [X86-32] Use _CRS for PCI resource | |
1561 | allocation. | |
1562 | routeirq Do IRQ routing for all PCI devices. | |
1563 | This is normally done in pci_enable_device(), | |
1564 | so this option is a temporary workaround | |
1565 | for broken drivers that don't call it. | |
1566 | skip_isa_align [X86] do not align io start addr, so can | |
1567 | handle more pci cards | |
1568 | firmware [ARM] Do not re-enumerate the bus but instead | |
1569 | just use the configuration from the | |
1570 | bootloader. This is currently used on | |
1571 | IXP2000 systems where the bus has to be | |
1572 | configured a certain way for adjunct CPUs. | |
1573 | noearly [X86] Don't do any early type 1 scanning. | |
1574 | This might help on some broken boards which | |
1575 | machine check when some devices' config space | |
1576 | is read. But various workarounds are disabled | |
1577 | and some IOMMU drivers will not work. | |
1578 | bfsort Sort PCI devices into breadth-first order. | |
1579 | This sorting is done to get a device | |
1580 | order compatible with older (<= 2.4) kernels. | |
1581 | nobfsort Don't sort PCI devices into breadth-first order. | |
1582 | cbiosize=nn[KMG] The fixed amount of bus space which is | |
1583 | reserved for the CardBus bridge's IO window. | |
1584 | The default value is 256 bytes. | |
1585 | cbmemsize=nn[KMG] The fixed amount of bus space which is | |
1586 | reserved for the CardBus bridge's memory | |
1587 | window. The default value is 64 megabytes. | |
1588 | ||
1589 | pcmv= [HW,PCMCIA] BadgePAD 4 | |
1590 | ||
1591 | pd. [PARIDE] | |
1592 | See Documentation/paride.txt. | |
1593 | ||
1594 | pdcchassis= [PARISC,HW] Disable/Enable PDC Chassis Status codes at | |
1595 | boot time. | |
1596 | Format: { 0 | 1 } | |
1597 | See arch/parisc/kernel/pdc_chassis.c | |
1598 | ||
1599 | pf. [PARIDE] | |
1600 | See Documentation/paride.txt. | |
1601 | ||
1602 | pg. [PARIDE] | |
1603 | See Documentation/paride.txt. | |
1604 | ||
1605 | pirq= [SMP,APIC] Manual mp-table setup | |
1606 | See Documentation/i386/IO-APIC.txt. | |
1607 | ||
1608 | plip= [PPT,NET] Parallel port network link | |
1609 | Format: { parport<nr> | timid | 0 } | |
1610 | See also Documentation/parport.txt. | |
1611 | ||
1612 | pmtmr= [X86] Manual setup of pmtmr I/O Port. | |
1613 | Override pmtimer IOPort with a hex value. | |
1614 | e.g. pmtmr=0x508 | |
1615 | ||
1616 | pnpacpi= [ACPI] | |
1617 | { off } | |
1618 | ||
1619 | pnpbios= [ISAPNP] | |
1620 | { on | off | curr | res | no-curr | no-res } | |
1621 | ||
1622 | pnp_reserve_irq= | |
1623 | [ISAPNP] Exclude IRQs for the autoconfiguration | |
1624 | ||
1625 | pnp_reserve_dma= | |
1626 | [ISAPNP] Exclude DMAs for the autoconfiguration | |
1627 | ||
1628 | pnp_reserve_io= [ISAPNP] Exclude I/O ports for the autoconfiguration | |
1629 | Ranges are in pairs (I/O port base and size). | |
1630 | ||
1631 | pnp_reserve_mem= | |
1632 | [ISAPNP] Exclude memory regions for the | |
1633 | autoconfiguration. | |
1634 | Ranges are in pairs (memory base and size). | |
1635 | ||
1636 | print-fatal-signals= | |
1637 | [KNL] debug: print fatal signals | |
1638 | print-fatal-signals=1: print segfault info to | |
1639 | the kernel console. | |
1640 | default: off. | |
1641 | ||
1642 | printk.time= Show timing data prefixed to each printk message line | |
1643 | Format: <bool> (1/Y/y=enable, 0/N/n=disable) | |
1644 | ||
1645 | profile= [KNL] Enable kernel profiling via /proc/profile | |
1646 | Format: [schedule,]<number> | |
1647 | Param: "schedule" - profile schedule points. | |
1648 | Param: <number> - step/bucket size as a power of 2 for | |
1649 | statistical time based profiling. | |
1650 | Param: "sleep" - profile D-state sleeping (millisecs). | |
1651 | Requires CONFIG_SCHEDSTATS | |
1652 | Param: "kvm" - profile VM exits. | |
1653 | ||
1654 | processor.max_cstate= [HW,ACPI] | |
1655 | Limit processor to maximum C-state | |
1656 | max_cstate=9 overrides any DMI blacklist limit. | |
1657 | ||
1658 | processor.nocst [HW,ACPI] | |
1659 | Ignore the _CST method to determine C-states, | |
1660 | instead using the legacy FADT method | |
1661 | ||
1662 | prompt_ramdisk= [RAM] List of RAM disks to prompt for floppy disk | |
1663 | before loading. | |
1664 | See Documentation/ramdisk.txt. | |
1665 | ||
1666 | psmouse.proto= [HW,MOUSE] Highest PS2 mouse protocol extension to | |
1667 | probe for; one of (bare|imps|exps|lifebook|any). | |
1668 | psmouse.rate= [HW,MOUSE] Set desired mouse report rate, in reports | |
1669 | per second. | |
1670 | psmouse.resetafter= [HW,MOUSE] | |
1671 | Try to reset the device after so many bad packets | |
1672 | (0 = never). | |
1673 | psmouse.resolution= | |
1674 | [HW,MOUSE] Set desired mouse resolution, in dpi. | |
1675 | psmouse.smartscroll= | |
1676 | [HW,MOUSE] Controls Logitech smartscroll autorepeat. | |
1677 | 0 = disabled, 1 = enabled (default). | |
1678 | ||
1679 | pss= [HW,OSS] Personal Sound System (ECHO ESC614) | |
1680 | Format: | |
1681 | <io>,<mss_io>,<mss_irq>,<mss_dma>,<mpu_io>,<mpu_irq> | |
1682 | ||
1683 | pt. [PARIDE] | |
1684 | See Documentation/paride.txt. | |
1685 | ||
1686 | pty.legacy_count= | |
1687 | [KNL] Number of legacy pty's. Overwrites compiled-in | |
1688 | default number. | |
1689 | ||
1690 | quiet [KNL] Disable most log messages | |
1691 | ||
1692 | r128= [HW,DRM] | |
1693 | ||
1694 | raid= [HW,RAID] | |
1695 | See Documentation/md.txt. | |
1696 | ||
1697 | ramdisk_blocksize= [RAM] | |
1698 | See Documentation/ramdisk.txt. | |
1699 | ||
1700 | ramdisk_size= [RAM] Sizes of RAM disks in kilobytes | |
1701 | See Documentation/ramdisk.txt. | |
1702 | ||
1703 | rcupdate.blimit= [KNL,BOOT] | |
1704 | Set maximum number of finished RCU callbacks to process | |
1705 | in one batch. | |
1706 | ||
1707 | rcupdate.qhimark= [KNL,BOOT] | |
1708 | Set threshold of queued | |
1709 | RCU callbacks over which batch limiting is disabled. | |
1710 | ||
1711 | rcupdate.qlowmark= [KNL,BOOT] | |
1712 | Set threshold of queued RCU callbacks below which | |
1713 | batch limiting is re-enabled. | |
1714 | ||
1715 | rdinit= [KNL] | |
1716 | Format: <full_path> | |
1717 | Run specified binary instead of /init from the ramdisk, | |
1718 | used for early userspace startup. See initrd. | |
1719 | ||
1720 | reboot= [BUGS=X86-32,BUGS=ARM,BUGS=IA-64] Rebooting mode | |
1721 | Format: <reboot_mode>[,<reboot_mode2>[,...]] | |
1722 | See arch/*/kernel/reboot.c or arch/*/kernel/process.c | |
1723 | ||
1724 | relax_domain_level= | |
1725 | [KNL, SMP] Set scheduler's default relax_domain_level. | |
1726 | See Documentation/cpusets.txt. | |
1727 | ||
1728 | reserve= [KNL,BUGS] Force the kernel to ignore some iomem area | |
1729 | ||
1730 | reservetop= [X86-32] | |
1731 | Format: nn[KMG] | |
1732 | Reserves a hole at the top of the kernel virtual | |
1733 | address space. | |
1734 | ||
1735 | reset_devices [KNL] Force drivers to reset the underlying device | |
1736 | during initialization. | |
1737 | ||
1738 | resume= [SWSUSP] | |
1739 | Specify the partition device for software suspend | |
1740 | ||
1741 | resume_offset= [SWSUSP] | |
1742 | Specify the offset from the beginning of the partition | |
1743 | given by "resume=" at which the swap header is located, | |
1744 | in <PAGE_SIZE> units (needed only for swap files). | |
1745 | See Documentation/power/swsusp-and-swap-files.txt | |
1746 | ||
1747 | retain_initrd [RAM] Keep initrd memory after extraction | |
1748 | ||
1749 | rhash_entries= [KNL,NET] | |
1750 | Set number of hash buckets for route cache | |
1751 | ||
1752 | riscom8= [HW,SERIAL] | |
1753 | Format: <io_board1>[,<io_board2>[,...<io_boardN>]] | |
1754 | ||
1755 | ro [KNL] Mount root device read-only on boot | |
1756 | ||
1757 | root= [KNL] Root filesystem | |
1758 | ||
1759 | rootdelay= [KNL] Delay (in seconds) to pause before attempting to | |
1760 | mount the root filesystem | |
1761 | ||
1762 | rootflags= [KNL] Set root filesystem mount option string | |
1763 | ||
1764 | rootfstype= [KNL] Set root filesystem type | |
1765 | ||
1766 | rootwait [KNL] Wait (indefinitely) for root device to show up. | |
1767 | Useful for devices that are detected asynchronously | |
1768 | (e.g. USB and MMC devices). | |
1769 | ||
1770 | root_plug.vendor_id= | |
1771 | [ROOTPLUG] Override the default vendor ID | |
1772 | ||
1773 | root_plug.product_id= | |
1774 | [ROOTPLUG] Override the default product ID | |
1775 | ||
1776 | root_plug.debug= | |
1777 | [ROOTPLUG] Enable debugging output | |
1778 | ||
1779 | rw [KNL] Mount root device read-write on boot | |
1780 | ||
1781 | S [KNL] Run init in single mode | |
1782 | ||
1783 | sa1100ir [NET] | |
1784 | See drivers/net/irda/sa1100_ir.c. | |
1785 | ||
1786 | sbni= [NET] Granch SBNI12 leased line adapter | |
1787 | ||
1788 | sc1200wdt= [HW,WDT] SC1200 WDT (watchdog) driver | |
1789 | Format: <io>[,<timeout>[,<isapnp>]] | |
1790 | ||
1791 | scsi_debug_*= [SCSI] | |
1792 | See drivers/scsi/scsi_debug.c. | |
1793 | ||
1794 | scsi_default_dev_flags= | |
1795 | [SCSI] SCSI default device flags | |
1796 | Format: <integer> | |
1797 | ||
1798 | scsi_dev_flags= [SCSI] Black/white list entry for vendor and model | |
1799 | Format: <vendor>:<model>:<flags> | |
1800 | (flags are integer value) | |
1801 | ||
1802 | scsi_logging_level= [SCSI] a bit mask of logging levels | |
1803 | See drivers/scsi/scsi_logging.h for bits. Also | |
1804 | settable via sysctl at dev.scsi.logging_level | |
1805 | (/proc/sys/dev/scsi/logging_level). | |
1806 | There is also a nice 'scsi_logging_level' script in the | |
1807 | S390-tools package, available for download at | |
1808 | http://www-128.ibm.com/developerworks/linux/linux390/s390-tools-1.5.4.html | |
1809 | ||
1810 | scsi_mod.scan= [SCSI] sync (default) scans SCSI busses as they are | |
1811 | discovered. async scans them in kernel threads, | |
1812 | allowing boot to proceed. none ignores them, expecting | |
1813 | user space to do the scan. | |
1814 | ||
1815 | selinux [SELINUX] Disable or enable SELinux at boot time. | |
1816 | Format: { "0" | "1" } | |
1817 | See security/selinux/Kconfig help text. | |
1818 | 0 -- disable. | |
1819 | 1 -- enable. | |
1820 | Default value is set via kernel config option. | |
1821 | If enabled at boot time, /selinux/disable can be used | |
1822 | later to disable prior to initial policy load. | |
1823 | ||
1824 | selinux_compat_net = | |
1825 | [SELINUX] Set initial selinux_compat_net flag value. | |
1826 | Format: { "0" | "1" } | |
1827 | 0 -- use new secmark-based packet controls | |
1828 | 1 -- use legacy packet controls | |
1829 | Default value is 0 (preferred). | |
1830 | Value can be changed at runtime via | |
1831 | /selinux/compat_net. | |
1832 | ||
1833 | serialnumber [BUGS=X86-32] | |
1834 | ||
1835 | shapers= [NET] | |
1836 | Maximal number of shapers. | |
1837 | ||
1838 | sim710= [SCSI,HW] | |
1839 | See header of drivers/scsi/sim710.c. | |
1840 | ||
1841 | simeth= [IA-64] | |
1842 | simscsi= | |
1843 | ||
1844 | slram= [HW,MTD] | |
1845 | ||
1846 | slub_debug[=options[,slabs]] [MM, SLUB] | |
1847 | Enabling slub_debug allows one to determine the | |
1848 | culprit if slab objects become corrupted. Enabling | |
1849 | slub_debug can create guard zones around objects and | |
1850 | may poison objects when not in use. Also tracks the | |
1851 | last alloc / free. For more information see | |
1852 | Documentation/vm/slub.txt. | |
1853 | ||
1854 | slub_max_order= [MM, SLUB] | |
1855 | Determines the maximum allowed order for slabs. | |
1856 | A high setting may cause OOMs due to memory | |
1857 | fragmentation. For more information see | |
1858 | Documentation/vm/slub.txt. | |
1859 | ||
1860 | slub_min_objects= [MM, SLUB] | |
1861 | The minimum number of objects per slab. SLUB will | |
1862 | increase the slab order up to slub_max_order to | |
1863 | generate a sufficiently large slab able to contain | |
1864 | the number of objects indicated. The higher the number | |
1865 | of objects the smaller the overhead of tracking slabs | |
1866 | and the less frequently locks need to be acquired. | |
1867 | For more information see Documentation/vm/slub.txt. | |
1868 | ||
1869 | slub_min_order= [MM, SLUB] | |
1870 | Determines the mininum page order for slabs. Must be | |
1871 | lower than slub_max_order. | |
1872 | For more information see Documentation/vm/slub.txt. | |
1873 | ||
1874 | slub_nomerge [MM, SLUB] | |
1875 | Disable merging of slabs with similar size. May be | |
1876 | necessary if there is some reason to distinguish | |
1877 | allocs to different slabs. Debug options disable | |
1878 | merging on their own. | |
1879 | For more information see Documentation/vm/slub.txt. | |
1880 | ||
1881 | smart2= [HW] | |
1882 | Format: <io1>[,<io2>[,...,<io8>]] | |
1883 | ||
1884 | smp-alt-once [X86-32,SMP] On a hotplug CPU system, only | |
1885 | attempt to substitute SMP alternatives once at boot. | |
1886 | ||
1887 | smsc-ircc2.nopnp [HW] Don't use PNP to discover SMC devices | |
1888 | smsc-ircc2.ircc_cfg= [HW] Device configuration I/O port | |
1889 | smsc-ircc2.ircc_sir= [HW] SIR base I/O port | |
1890 | smsc-ircc2.ircc_fir= [HW] FIR base I/O port | |
1891 | smsc-ircc2.ircc_irq= [HW] IRQ line | |
1892 | smsc-ircc2.ircc_dma= [HW] DMA channel | |
1893 | smsc-ircc2.ircc_transceiver= [HW] Transceiver type: | |
1894 | 0: Toshiba Satellite 1800 (GP data pin select) | |
1895 | 1: Fast pin select (default) | |
1896 | 2: ATC IRMode | |
1897 | ||
1898 | snd-ad1816a= [HW,ALSA] | |
1899 | ||
1900 | snd-ad1848= [HW,ALSA] | |
1901 | ||
1902 | snd-ali5451= [HW,ALSA] | |
1903 | ||
1904 | snd-als100= [HW,ALSA] | |
1905 | ||
1906 | snd-als4000= [HW,ALSA] | |
1907 | ||
1908 | snd-azt2320= [HW,ALSA] | |
1909 | ||
1910 | snd-cmi8330= [HW,ALSA] | |
1911 | ||
1912 | snd-cmipci= [HW,ALSA] | |
1913 | ||
1914 | snd-cs4231= [HW,ALSA] | |
1915 | ||
1916 | snd-cs4232= [HW,ALSA] | |
1917 | ||
1918 | snd-cs4236= [HW,ALSA] | |
1919 | ||
1920 | snd-cs4281= [HW,ALSA] | |
1921 | ||
1922 | snd-cs46xx= [HW,ALSA] | |
1923 | ||
1924 | snd-dt019x= [HW,ALSA] | |
1925 | ||
1926 | snd-dummy= [HW,ALSA] | |
1927 | ||
1928 | snd-emu10k1= [HW,ALSA] | |
1929 | ||
1930 | snd-ens1370= [HW,ALSA] | |
1931 | ||
1932 | snd-ens1371= [HW,ALSA] | |
1933 | ||
1934 | snd-es968= [HW,ALSA] | |
1935 | ||
1936 | snd-es1688= [HW,ALSA] | |
1937 | ||
1938 | snd-es18xx= [HW,ALSA] | |
1939 | ||
1940 | snd-es1938= [HW,ALSA] | |
1941 | ||
1942 | snd-es1968= [HW,ALSA] | |
1943 | ||
1944 | snd-fm801= [HW,ALSA] | |
1945 | ||
1946 | snd-gusclassic= [HW,ALSA] | |
1947 | ||
1948 | snd-gusextreme= [HW,ALSA] | |
1949 | ||
1950 | snd-gusmax= [HW,ALSA] | |
1951 | ||
1952 | snd-hdsp= [HW,ALSA] | |
1953 | ||
1954 | snd-ice1712= [HW,ALSA] | |
1955 | ||
1956 | snd-intel8x0= [HW,ALSA] | |
1957 | ||
1958 | snd-interwave= [HW,ALSA] | |
1959 | ||
1960 | snd-interwave-stb= | |
1961 | [HW,ALSA] | |
1962 | ||
1963 | snd-korg1212= [HW,ALSA] | |
1964 | ||
1965 | snd-maestro3= [HW,ALSA] | |
1966 | ||
1967 | snd-mpu401= [HW,ALSA] | |
1968 | ||
1969 | snd-mtpav= [HW,ALSA] | |
1970 | ||
1971 | snd-nm256= [HW,ALSA] | |
1972 | ||
1973 | snd-opl3sa2= [HW,ALSA] | |
1974 | ||
1975 | snd-opti92x-ad1848= | |
1976 | [HW,ALSA] | |
1977 | ||
1978 | snd-opti92x-cs4231= | |
1979 | [HW,ALSA] | |
1980 | ||
1981 | snd-opti93x= [HW,ALSA] | |
1982 | ||
1983 | snd-pmac= [HW,ALSA] | |
1984 | ||
1985 | snd-rme32= [HW,ALSA] | |
1986 | ||
1987 | snd-rme96= [HW,ALSA] | |
1988 | ||
1989 | snd-rme9652= [HW,ALSA] | |
1990 | ||
1991 | snd-sb8= [HW,ALSA] | |
1992 | ||
1993 | snd-sb16= [HW,ALSA] | |
1994 | ||
1995 | snd-sbawe= [HW,ALSA] | |
1996 | ||
1997 | snd-serial= [HW,ALSA] | |
1998 | ||
1999 | snd-sgalaxy= [HW,ALSA] | |
2000 | ||
2001 | snd-sonicvibes= [HW,ALSA] | |
2002 | ||
2003 | snd-sun-amd7930= | |
2004 | [HW,ALSA] | |
2005 | ||
2006 | snd-sun-cs4231= [HW,ALSA] | |
2007 | ||
2008 | snd-trident= [HW,ALSA] | |
2009 | ||
2010 | snd-usb-audio= [HW,ALSA,USB] | |
2011 | ||
2012 | snd-via82xx= [HW,ALSA] | |
2013 | ||
2014 | snd-virmidi= [HW,ALSA] | |
2015 | ||
2016 | snd-wavefront= [HW,ALSA] | |
2017 | ||
2018 | snd-ymfpci= [HW,ALSA] | |
2019 | ||
2020 | sonypi.*= [HW] Sony Programmable I/O Control Device driver | |
2021 | See Documentation/sonypi.txt | |
2022 | ||
2023 | specialix= [HW,SERIAL] Specialix multi-serial port adapter | |
2024 | See Documentation/specialix.txt. | |
2025 | ||
2026 | spia_io_base= [HW,MTD] | |
2027 | spia_fio_base= | |
2028 | spia_pedr= | |
2029 | spia_peddr= | |
2030 | ||
2031 | sscape= [HW,OSS] | |
2032 | Format: <io>,<irq>,<dma>,<mpu_io>,<mpu_irq> | |
2033 | ||
2034 | st= [HW,SCSI] SCSI tape parameters (buffers, etc.) | |
2035 | See Documentation/scsi/st.txt. | |
2036 | ||
2037 | sti= [PARISC,HW] | |
2038 | Format: <num> | |
2039 | Set the STI (builtin display/keyboard on the HP-PARISC | |
2040 | machines) console (graphic card) which should be used | |
2041 | as the initial boot-console. | |
2042 | See also comment in drivers/video/console/sticore.c. | |
2043 | ||
2044 | sti_font= [HW] | |
2045 | See comment in drivers/video/console/sticore.c. | |
2046 | ||
2047 | stifb= [HW] | |
2048 | Format: bpp:<bpp1>[:<bpp2>[:<bpp3>...]] | |
2049 | ||
2050 | sunrpc.pool_mode= | |
2051 | [NFS] | |
2052 | Control how the NFS server code allocates CPUs to | |
2053 | service thread pools. Depending on how many NICs | |
2054 | you have and where their interrupts are bound, this | |
2055 | option will affect which CPUs will do NFS serving. | |
2056 | Note: this parameter cannot be changed while the | |
2057 | NFS server is running. | |
2058 | ||
2059 | auto the server chooses an appropriate mode | |
2060 | automatically using heuristics | |
2061 | global a single global pool contains all CPUs | |
2062 | percpu one pool for each CPU | |
2063 | pernode one pool for each NUMA node (equivalent | |
2064 | to global on non-NUMA machines) | |
2065 | ||
2066 | swiotlb= [IA-64] Number of I/O TLB slabs | |
2067 | ||
2068 | switches= [HW,M68k] | |
2069 | ||
2070 | sym53c416= [HW,SCSI] | |
2071 | See header of drivers/scsi/sym53c416.c. | |
2072 | ||
2073 | sysrq_always_enabled | |
2074 | [KNL] | |
2075 | Ignore sysrq setting - this boot parameter will | |
2076 | neutralize any effect of /proc/sys/kernel/sysrq. | |
2077 | Useful for debugging. | |
2078 | ||
2079 | t128= [HW,SCSI] | |
2080 | See header of drivers/scsi/t128.c. | |
2081 | ||
2082 | tdfx= [HW,DRM] | |
2083 | ||
2084 | thash_entries= [KNL,NET] | |
2085 | Set number of hash buckets for TCP connection | |
2086 | ||
2087 | thermal.act= [HW,ACPI] | |
2088 | -1: disable all active trip points in all thermal zones | |
2089 | <degrees C>: override all lowest active trip points | |
2090 | ||
2091 | thermal.crt= [HW,ACPI] | |
2092 | -1: disable all critical trip points in all thermal zones | |
2093 | <degrees C>: lower all critical trip points | |
2094 | ||
2095 | thermal.nocrt= [HW,ACPI] | |
2096 | Set to disable actions on ACPI thermal zone | |
2097 | critical and hot trip points. | |
2098 | ||
2099 | thermal.off= [HW,ACPI] | |
2100 | 1: disable ACPI thermal control | |
2101 | ||
2102 | thermal.psv= [HW,ACPI] | |
2103 | -1: disable all passive trip points | |
2104 | <degrees C>: override all passive trip points to this value | |
2105 | ||
2106 | thermal.tzp= [HW,ACPI] | |
2107 | Specify global default ACPI thermal zone polling rate | |
2108 | <deci-seconds>: poll all this frequency | |
2109 | 0: no polling (default) | |
2110 | ||
2111 | tipar.timeout= [HW,PPT] | |
2112 | Set communications timeout in tenths of a second | |
2113 | (default 15). | |
2114 | ||
2115 | tipar.delay= [HW,PPT] | |
2116 | Set inter-bit delay in microseconds (default 10). | |
2117 | ||
2118 | tmscsim= [HW,SCSI] | |
2119 | See comment before function dc390_setup() in | |
2120 | drivers/scsi/tmscsim.c. | |
2121 | ||
2122 | tp720= [HW,PS2] | |
2123 | ||
2124 | trix= [HW,OSS] MediaTrix AudioTrix Pro | |
2125 | Format: | |
2126 | <io>,<irq>,<dma>,<dma2>,<sb_io>,<sb_irq>,<sb_dma>,<mpu_io>,<mpu_irq> | |
2127 | ||
2128 | turbografx.map[2|3]= [HW,JOY] | |
2129 | TurboGraFX parallel port interface | |
2130 | Format: | |
2131 | <port#>,<js1>,<js2>,<js3>,<js4>,<js5>,<js6>,<js7> | |
2132 | See also Documentation/input/joystick-parport.txt | |
2133 | ||
2134 | u14-34f= [HW,SCSI] UltraStor 14F/34F SCSI host adapter | |
2135 | See header of drivers/scsi/u14-34f.c. | |
2136 | ||
2137 | uart401= [HW,OSS] | |
2138 | Format: <io>,<irq> | |
2139 | ||
2140 | uart6850= [HW,OSS] | |
2141 | Format: <io>,<irq> | |
2142 | ||
2143 | uhci-hcd.ignore_oc= | |
2144 | [USB] Ignore overcurrent events (default N). | |
2145 | Some badly-designed motherboards generate lots of | |
2146 | bogus events, for ports that aren't wired to | |
2147 | anything. Set this parameter to avoid log spamming. | |
2148 | Note that genuine overcurrent events won't be | |
2149 | reported either. | |
2150 | ||
2151 | usbcore.autosuspend= | |
2152 | [USB] The autosuspend time delay (in seconds) used | |
2153 | for newly-detected USB devices (default 2). This | |
2154 | is the time required before an idle device will be | |
2155 | autosuspended. Devices for which the delay is set | |
2156 | to a negative value won't be autosuspended at all. | |
2157 | ||
2158 | usbhid.mousepoll= | |
2159 | [USBHID] The interval which mice are to be polled at. | |
2160 | ||
2161 | add_efi_memmap [EFI; x86-32,X86-64] Include EFI memory map in | |
2162 | kernel's map of available physical RAM. | |
2163 | ||
2164 | vdso= [X86-32,SH,x86-64] | |
2165 | vdso=2: enable compat VDSO (default with COMPAT_VDSO) | |
2166 | vdso=1: enable VDSO (default) | |
2167 | vdso=0: disable VDSO mapping | |
2168 | ||
2169 | vdso32= [X86-32,X86-64] | |
2170 | vdso32=2: enable compat VDSO (default with COMPAT_VDSO) | |
2171 | vdso32=1: enable 32-bit VDSO (default) | |
2172 | vdso32=0: disable 32-bit VDSO mapping | |
2173 | ||
2174 | vector= [IA-64,SMP] | |
2175 | vector=percpu: enable percpu vector domain | |
2176 | ||
2177 | video= [FB] Frame buffer configuration | |
2178 | See Documentation/fb/modedb.txt. | |
2179 | ||
2180 | vga= [BOOT,X86-32] Select a particular video mode | |
2181 | See Documentation/i386/boot.txt and | |
2182 | Documentation/svga.txt. | |
2183 | Use vga=ask for menu. | |
2184 | This is actually a boot loader parameter; the value is | |
2185 | passed to the kernel using a special protocol. | |
2186 | ||
2187 | vmalloc=nn[KMG] [KNL,BOOT] Forces the vmalloc area to have an exact | |
2188 | size of <nn>. This can be used to increase the | |
2189 | minimum size (128MB on x86). It can also be used to | |
2190 | decrease the size and leave more room for directly | |
2191 | mapped kernel RAM. | |
2192 | ||
2193 | vmhalt= [KNL,S390] Perform z/VM CP command after system halt. | |
2194 | Format: <command> | |
2195 | ||
2196 | vmpanic= [KNL,S390] Perform z/VM CP command after kernel panic. | |
2197 | Format: <command> | |
2198 | ||
2199 | vmpoff= [KNL,S390] Perform z/VM CP command after power off. | |
2200 | Format: <command> | |
2201 | ||
2202 | waveartist= [HW,OSS] | |
2203 | Format: <io>,<irq>,<dma>,<dma2> | |
2204 | ||
2205 | wd33c93= [HW,SCSI] | |
2206 | See header of drivers/scsi/wd33c93.c. | |
2207 | ||
2208 | wd7000= [HW,SCSI] | |
2209 | See header of drivers/scsi/wd7000.c. | |
2210 | ||
2211 | wdt= [WDT] Watchdog | |
2212 | See Documentation/watchdog/wdt.txt. | |
2213 | ||
2214 | xd= [HW,XT] Original XT pre-IDE (RLL encoded) disks. | |
2215 | xd_geo= See header of drivers/block/xd.c. | |
2216 | ||
2217 | xirc2ps_cs= [NET,PCMCIA] | |
2218 | Format: | |
2219 | <irq>,<irq_mask>,<io>,<full_duplex>,<do_sound>,<lockup_hack>[,<irq2>[,<irq3>[,<irq4>]]] | |
2220 | ||
2221 | norandmaps Don't use address space randomization | |
2222 | Equivalent to echo 0 > /proc/sys/kernel/randomize_va_space | |
2223 | ||
2224 | ______________________________________________________________________ | |
2225 | ||
2226 | TODO: | |
2227 | ||
2228 | Add documentation for ALSA options. | |
2229 | Add more DRM drivers. |