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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 | Hyphens (dashes) and underscores are equivalent in parameter names, so |
21 | log_buf_len=1M print-fatal-signals=1 |
22 | can also be entered as |
23 | log-buf-len=1M print_fatal_signals=1 |
24 | |
25 | |
26 | This document may not be entirely up to date and comprehensive. The command |
27 | "modinfo -p ${modulename}" shows a current list of all parameters of a loadable |
28 | module. Loadable modules, after being loaded into the running kernel, also |
29 | reveal their parameters in /sys/module/${modulename}/parameters/. Some of these |
30 | parameters may be changed at runtime by the command |
31 | "echo -n ${value} > /sys/module/${modulename}/parameters/${parm}". |
32 | |
33 | The parameters listed below are only valid if certain kernel build options were |
34 | enabled and if respective hardware is present. The text in square brackets at |
35 | the beginning of each description states the restrictions within which a |
36 | parameter is applicable: |
37 | |
38 | ACPI ACPI support is enabled. |
39 | AGP AGP (Accelerated Graphics Port) is enabled. |
40 | ALSA ALSA sound support is enabled. |
41 | APIC APIC support is enabled. |
42 | APM Advanced Power Management support is enabled. |
43 | ARM ARM architecture is enabled. |
44 | AVR32 AVR32 architecture is enabled. |
45 | AX25 Appropriate AX.25 support is enabled. |
46 | BLACKFIN Blackfin architecture is enabled. |
47 | DRM Direct Rendering Management support is enabled. |
48 | DYNAMIC_DEBUG Build in debug messages and enable them at runtime |
49 | EDD BIOS Enhanced Disk Drive Services (EDD) is enabled |
50 | EFI EFI Partitioning (GPT) is enabled |
51 | EIDE EIDE/ATAPI support is enabled. |
52 | EVM Extended Verification Module |
53 | FB The frame buffer device is enabled. |
54 | FTRACE Function tracing enabled. |
55 | GCOV GCOV profiling is enabled. |
56 | HW Appropriate hardware is enabled. |
57 | IA-64 IA-64 architecture is enabled. |
58 | IMA Integrity measurement architecture is enabled. |
59 | IOSCHED More than one I/O scheduler is enabled. |
60 | IP_PNP IP DHCP, BOOTP, or RARP is enabled. |
61 | IPV6 IPv6 support is enabled. |
62 | ISAPNP ISA PnP code is enabled. |
63 | ISDN Appropriate ISDN support is enabled. |
64 | JOY Appropriate joystick support is enabled. |
65 | KGDB Kernel debugger support is enabled. |
66 | KVM Kernel Virtual Machine support is enabled. |
67 | LIBATA Libata driver is enabled |
68 | LP Printer support is enabled. |
69 | LOOP Loopback device support is enabled. |
70 | M68k M68k architecture is enabled. |
71 | These options have more detailed description inside of |
72 | Documentation/m68k/kernel-options.txt. |
73 | MCA MCA bus support is enabled. |
74 | MDA MDA console support is enabled. |
75 | MIPS MIPS architecture is enabled. |
76 | MOUSE Appropriate mouse support is enabled. |
77 | MSI Message Signaled Interrupts (PCI). |
78 | MTD MTD (Memory Technology Device) support is enabled. |
79 | NET Appropriate network support is enabled. |
80 | NUMA NUMA support is enabled. |
81 | NFS Appropriate NFS support is enabled. |
82 | OSS OSS sound support is enabled. |
83 | PV_OPS A paravirtualized kernel is enabled. |
84 | PARIDE The ParIDE (parallel port IDE) subsystem is enabled. |
85 | PARISC The PA-RISC architecture is enabled. |
86 | PCI PCI bus support is enabled. |
87 | PCIE PCI Express support is enabled. |
88 | PCMCIA The PCMCIA subsystem is enabled. |
89 | PNP Plug & Play support is enabled. |
90 | PPC PowerPC architecture is enabled. |
91 | PPT Parallel port support is enabled. |
92 | PS2 Appropriate PS/2 support is enabled. |
93 | RAM RAM disk support is enabled. |
94 | S390 S390 architecture is enabled. |
95 | SCSI Appropriate SCSI support is enabled. |
96 | A lot of drivers have their options described inside |
97 | the Documentation/scsi/ sub-directory. |
98 | SECURITY Different security models are enabled. |
99 | SELINUX SELinux support is enabled. |
100 | APPARMOR AppArmor support is enabled. |
101 | SERIAL Serial support is enabled. |
102 | SH SuperH architecture is enabled. |
103 | SMP The kernel is an SMP kernel. |
104 | SPARC Sparc architecture is enabled. |
105 | SWSUSP Software suspend (hibernation) is enabled. |
106 | SUSPEND System suspend states are enabled. |
107 | TPM TPM drivers are enabled. |
108 | TS Appropriate touchscreen support is enabled. |
109 | UMS USB Mass Storage support is enabled. |
110 | USB USB support is enabled. |
111 | USBHID USB Human Interface Device support is enabled. |
112 | V4L Video For Linux support is enabled. |
113 | VGA The VGA console has been enabled. |
114 | VT Virtual terminal support is enabled. |
115 | WDT Watchdog support is enabled. |
116 | XT IBM PC/XT MFM hard disk support is enabled. |
117 | X86-32 X86-32, aka i386 architecture is enabled. |
118 | X86-64 X86-64 architecture is enabled. |
119 | More X86-64 boot options can be found in |
120 | Documentation/x86/x86_64/boot-options.txt . |
121 | X86 Either 32-bit or 64-bit x86 (same as X86-32+X86-64) |
122 | XEN Xen support is enabled |
123 | |
124 | In addition, the following text indicates that the option: |
125 | |
126 | BUGS= Relates to possible processor bugs on the said processor. |
127 | KNL Is a kernel start-up parameter. |
128 | BOOT Is a boot loader parameter. |
129 | |
130 | Parameters denoted with BOOT are actually interpreted by the boot |
131 | loader, and have no meaning to the kernel directly. |
132 | Do not modify the syntax of boot loader parameters without extreme |
133 | need or coordination with <Documentation/x86/boot.txt>. |
134 | |
135 | There are also arch-specific kernel-parameters not documented here. |
136 | See for example <Documentation/x86/x86_64/boot-options.txt>. |
137 | |
138 | Note that ALL kernel parameters listed below are CASE SENSITIVE, and that |
139 | a trailing = on the name of any parameter states that that parameter will |
140 | be entered as an environment variable, whereas its absence indicates that |
141 | it will appear as a kernel argument readable via /proc/cmdline by programs |
142 | running once the system is up. |
143 | |
144 | The number of kernel parameters is not limited, but the length of the |
145 | complete command line (parameters including spaces etc.) is limited to |
146 | a fixed number of characters. This limit depends on the architecture |
147 | and is between 256 and 4096 characters. It is defined in the file |
148 | ./include/asm/setup.h as COMMAND_LINE_SIZE. |
149 | |
150 | Finally, the [KMG] suffix is commonly described after a number of kernel |
151 | parameter values. These 'K', 'M', and 'G' letters represent the _binary_ |
152 | multipliers 'Kilo', 'Mega', and 'Giga', equalling 2^10, 2^20, and 2^30 |
153 | bytes respectively. Such letter suffixes can also be entirely omitted. |
154 | |
155 | |
156 | acpi= [HW,ACPI,X86] |
157 | Advanced Configuration and Power Interface |
158 | Format: { force | off | strict | noirq | rsdt } |
159 | force -- enable ACPI if default was off |
160 | off -- disable ACPI if default was on |
161 | noirq -- do not use ACPI for IRQ routing |
162 | strict -- Be less tolerant of platforms that are not |
163 | strictly ACPI specification compliant. |
164 | rsdt -- prefer RSDT over (default) XSDT |
165 | copy_dsdt -- copy DSDT to memory |
166 | |
167 | See also Documentation/power/runtime_pm.txt, pci=noacpi |
168 | |
169 | acpi_rsdp= [ACPI,EFI,KEXEC] |
170 | Pass the RSDP address to the kernel, mostly used |
171 | on machines running EFI runtime service to boot the |
172 | second kernel for kdump. |
173 | |
174 | acpi_apic_instance= [ACPI, IOAPIC] |
175 | Format: <int> |
176 | 2: use 2nd APIC table, if available |
177 | 1,0: use 1st APIC table |
178 | default: 0 |
179 | |
180 | acpi_backlight= [HW,ACPI] |
181 | acpi_backlight=vendor |
182 | acpi_backlight=video |
183 | If set to vendor, prefer vendor specific driver |
184 | (e.g. thinkpad_acpi, sony_acpi, etc.) instead |
185 | of the ACPI video.ko driver. |
186 | |
187 | acpi.debug_layer= [HW,ACPI,ACPI_DEBUG] |
188 | acpi.debug_level= [HW,ACPI,ACPI_DEBUG] |
189 | Format: <int> |
190 | CONFIG_ACPI_DEBUG must be enabled to produce any ACPI |
191 | debug output. Bits in debug_layer correspond to a |
192 | _COMPONENT in an ACPI source file, e.g., |
193 | #define _COMPONENT ACPI_PCI_COMPONENT |
194 | Bits in debug_level correspond to a level in |
195 | ACPI_DEBUG_PRINT statements, e.g., |
196 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, ... |
197 | The debug_level mask defaults to "info". See |
198 | Documentation/acpi/debug.txt for more information about |
199 | debug layers and levels. |
200 | |
201 | Enable processor driver info messages: |
202 | acpi.debug_layer=0x20000000 |
203 | Enable PCI/PCI interrupt routing info messages: |
204 | acpi.debug_layer=0x400000 |
205 | Enable AML "Debug" output, i.e., stores to the Debug |
206 | object while interpreting AML: |
207 | acpi.debug_layer=0xffffffff acpi.debug_level=0x2 |
208 | Enable all messages related to ACPI hardware: |
209 | acpi.debug_layer=0x2 acpi.debug_level=0xffffffff |
210 | |
211 | Some values produce so much output that the system is |
212 | unusable. The "log_buf_len" parameter may be useful |
213 | if you need to capture more output. |
214 | |
215 | acpi_irq_balance [HW,ACPI] |
216 | ACPI will balance active IRQs |
217 | default in APIC mode |
218 | |
219 | acpi_irq_nobalance [HW,ACPI] |
220 | ACPI will not move active IRQs (default) |
221 | default in PIC mode |
222 | |
223 | acpi_irq_isa= [HW,ACPI] If irq_balance, mark listed IRQs used by ISA |
224 | Format: <irq>,<irq>... |
225 | |
226 | acpi_irq_pci= [HW,ACPI] If irq_balance, clear listed IRQs for |
227 | use by PCI |
228 | Format: <irq>,<irq>... |
229 | |
230 | acpi_no_auto_ssdt [HW,ACPI] Disable automatic loading of SSDT |
231 | |
232 | acpi_os_name= [HW,ACPI] Tell ACPI BIOS the name of the OS |
233 | Format: To spoof as Windows 98: ="Microsoft Windows" |
234 | |
235 | acpi_osi= [HW,ACPI] Modify list of supported OS interface strings |
236 | acpi_osi="string1" # add string1 -- only one string |
237 | acpi_osi="!string2" # remove built-in string2 |
238 | acpi_osi= # disable all strings |
239 | |
240 | acpi_pm_good [X86] |
241 | Override the pmtimer bug detection: force the kernel |
242 | to assume that this machine's pmtimer latches its value |
243 | and always returns good values. |
244 | |
245 | acpi_sci= [HW,ACPI] ACPI System Control Interrupt trigger mode |
246 | Format: { level | edge | high | low } |
247 | |
248 | acpi_serialize [HW,ACPI] force serialization of AML methods |
249 | |
250 | acpi_skip_timer_override [HW,ACPI] |
251 | Recognize and ignore IRQ0/pin2 Interrupt Override. |
252 | For broken nForce2 BIOS resulting in XT-PIC timer. |
253 | |
254 | acpi_sleep= [HW,ACPI] Sleep options |
255 | Format: { s3_bios, s3_mode, s3_beep, s4_nohwsig, |
256 | old_ordering, nonvs, sci_force_enable } |
257 | See Documentation/power/video.txt for information on |
258 | s3_bios and s3_mode. |
259 | s3_beep is for debugging; it makes the PC's speaker beep |
260 | as soon as the kernel's real-mode entry point is called. |
261 | s4_nohwsig prevents ACPI hardware signature from being |
262 | used during resume from hibernation. |
263 | old_ordering causes the ACPI 1.0 ordering of the _PTS |
264 | control method, with respect to putting devices into |
265 | low power states, to be enforced (the ACPI 2.0 ordering |
266 | of _PTS is used by default). |
267 | nonvs prevents the kernel from saving/restoring the |
268 | ACPI NVS memory during suspend/hibernation and resume. |
269 | sci_force_enable causes the kernel to set SCI_EN directly |
270 | on resume from S1/S3 (which is against the ACPI spec, |
271 | but some broken systems don't work without it). |
272 | |
273 | acpi_use_timer_override [HW,ACPI] |
274 | Use timer override. For some broken Nvidia NF5 boards |
275 | that require a timer override, but don't have HPET |
276 | |
277 | acpi_enforce_resources= [ACPI] |
278 | { strict | lax | no } |
279 | Check for resource conflicts between native drivers |
280 | and ACPI OperationRegions (SystemIO and SystemMemory |
281 | only). IO ports and memory declared in ACPI might be |
282 | used by the ACPI subsystem in arbitrary AML code and |
283 | can interfere with legacy drivers. |
284 | strict (default): access to resources claimed by ACPI |
285 | is denied; legacy drivers trying to access reserved |
286 | resources will fail to bind to device using them. |
287 | lax: access to resources claimed by ACPI is allowed; |
288 | legacy drivers trying to access reserved resources |
289 | will bind successfully but a warning message is logged. |
290 | no: ACPI OperationRegions are not marked as reserved, |
291 | no further checks are performed. |
292 | |
293 | add_efi_memmap [EFI; X86] Include EFI memory map in |
294 | kernel's map of available physical RAM. |
295 | |
296 | agp= [AGP] |
297 | { off | try_unsupported } |
298 | off: disable AGP support |
299 | try_unsupported: try to drive unsupported chipsets |
300 | (may crash computer or cause data corruption) |
301 | |
302 | ALSA [HW,ALSA] |
303 | See Documentation/sound/alsa/alsa-parameters.txt |
304 | |
305 | alignment= [KNL,ARM] |
306 | Allow the default userspace alignment fault handler |
307 | behaviour to be specified. Bit 0 enables warnings, |
308 | bit 1 enables fixups, and bit 2 sends a segfault. |
309 | |
310 | align_va_addr= [X86-64] |
311 | Align virtual addresses by clearing slice [14:12] when |
312 | allocating a VMA at process creation time. This option |
313 | gives you up to 3% performance improvement on AMD F15h |
314 | machines (where it is enabled by default) for a |
315 | CPU-intensive style benchmark, and it can vary highly in |
316 | a microbenchmark depending on workload and compiler. |
317 | |
318 | 32: only for 32-bit processes |
319 | 64: only for 64-bit processes |
320 | on: enable for both 32- and 64-bit processes |
321 | off: disable for both 32- and 64-bit processes |
322 | |
323 | amd_iommu= [HW,X86-64] |
324 | Pass parameters to the AMD IOMMU driver in the system. |
325 | Possible values are: |
326 | fullflush - enable flushing of IO/TLB entries when |
327 | they are unmapped. Otherwise they are |
328 | flushed before they will be reused, which |
329 | is a lot of faster |
330 | off - do not initialize any AMD IOMMU found in |
331 | the system |
332 | force_isolation - Force device isolation for all |
333 | devices. The IOMMU driver is not |
334 | allowed anymore to lift isolation |
335 | requirements as needed. This option |
336 | does not override iommu=pt |
337 | |
338 | amijoy.map= [HW,JOY] Amiga joystick support |
339 | Map of devices attached to JOY0DAT and JOY1DAT |
340 | Format: <a>,<b> |
341 | See also Documentation/input/joystick.txt |
342 | |
343 | analog.map= [HW,JOY] Analog joystick and gamepad support |
344 | Specifies type or capabilities of an analog joystick |
345 | connected to one of 16 gameports |
346 | Format: <type1>,<type2>,..<type16> |
347 | |
348 | apc= [HW,SPARC] |
349 | Power management functions (SPARCstation-4/5 + deriv.) |
350 | Format: noidle |
351 | Disable APC CPU standby support. SPARCstation-Fox does |
352 | not play well with APC CPU idle - disable it if you have |
353 | APC and your system crashes randomly. |
354 | |
355 | apic= [APIC,X86-32] Advanced Programmable Interrupt Controller |
356 | Change the output verbosity whilst booting |
357 | Format: { quiet (default) | verbose | debug } |
358 | Change the amount of debugging information output |
359 | when initialising the APIC and IO-APIC components. |
360 | |
361 | autoconf= [IPV6] |
362 | See Documentation/networking/ipv6.txt. |
363 | |
364 | show_lapic= [APIC,X86] Advanced Programmable Interrupt Controller |
365 | Limit apic dumping. The parameter defines the maximal |
366 | number of local apics being dumped. Also it is possible |
367 | to set it to "all" by meaning -- no limit here. |
368 | Format: { 1 (default) | 2 | ... | all }. |
369 | The parameter valid if only apic=debug or |
370 | apic=verbose is specified. |
371 | Example: apic=debug show_lapic=all |
372 | |
373 | apm= [APM] Advanced Power Management |
374 | See header of arch/x86/kernel/apm_32.c. |
375 | |
376 | arcrimi= [HW,NET] ARCnet - "RIM I" (entirely mem-mapped) cards |
377 | Format: <io>,<irq>,<nodeID> |
378 | |
379 | ataflop= [HW,M68k] |
380 | |
381 | atarimouse= [HW,MOUSE] Atari Mouse |
382 | |
383 | atkbd.extra= [HW] Enable extra LEDs and keys on IBM RapidAccess, |
384 | EzKey and similar keyboards |
385 | |
386 | atkbd.reset= [HW] Reset keyboard during initialization |
387 | |
388 | atkbd.set= [HW] Select keyboard code set |
389 | Format: <int> (2 = AT (default), 3 = PS/2) |
390 | |
391 | atkbd.scroll= [HW] Enable scroll wheel on MS Office and similar |
392 | keyboards |
393 | |
394 | atkbd.softraw= [HW] Choose between synthetic and real raw mode |
395 | Format: <bool> (0 = real, 1 = synthetic (default)) |
396 | |
397 | atkbd.softrepeat= [HW] |
398 | Use software keyboard repeat |
399 | |
400 | autotest [IA-64] |
401 | |
402 | baycom_epp= [HW,AX25] |
403 | Format: <io>,<mode> |
404 | |
405 | baycom_par= [HW,AX25] BayCom Parallel Port AX.25 Modem |
406 | Format: <io>,<mode> |
407 | See header of drivers/net/hamradio/baycom_par.c. |
408 | |
409 | baycom_ser_fdx= [HW,AX25] |
410 | BayCom Serial Port AX.25 Modem (Full Duplex Mode) |
411 | Format: <io>,<irq>,<mode>[,<baud>] |
412 | See header of drivers/net/hamradio/baycom_ser_fdx.c. |
413 | |
414 | baycom_ser_hdx= [HW,AX25] |
415 | BayCom Serial Port AX.25 Modem (Half Duplex Mode) |
416 | Format: <io>,<irq>,<mode> |
417 | See header of drivers/net/hamradio/baycom_ser_hdx.c. |
418 | |
419 | boot_delay= Milliseconds to delay each printk during boot. |
420 | Values larger than 10 seconds (10000) are changed to |
421 | no delay (0). |
422 | Format: integer |
423 | |
424 | bootmem_debug [KNL] Enable bootmem allocator debug messages. |
425 | |
426 | bttv.card= [HW,V4L] bttv (bt848 + bt878 based grabber cards) |
427 | bttv.radio= Most important insmod options are available as |
428 | kernel args too. |
429 | bttv.pll= See Documentation/video4linux/bttv/Insmod-options |
430 | bttv.tuner= |
431 | |
432 | bulk_remove=off [PPC] This parameter disables the use of the pSeries |
433 | firmware feature for flushing multiple hpte entries |
434 | at a time. |
435 | |
436 | c101= [NET] Moxa C101 synchronous serial card |
437 | |
438 | cachesize= [BUGS=X86-32] Override level 2 CPU cache size detection. |
439 | Sometimes CPU hardware bugs make them report the cache |
440 | size incorrectly. The kernel will attempt work arounds |
441 | to fix known problems, but for some CPUs it is not |
442 | possible to determine what the correct size should be. |
443 | This option provides an override for these situations. |
444 | |
445 | capability.disable= |
446 | [SECURITY] Disable capabilities. This would normally |
447 | be used only if an alternative security model is to be |
448 | configured. Potentially dangerous and should only be |
449 | used if you are entirely sure of the consequences. |
450 | |
451 | ccw_timeout_log [S390] |
452 | See Documentation/s390/CommonIO for details. |
453 | |
454 | cgroup_disable= [KNL] Disable a particular controller |
455 | Format: {name of the controller(s) to disable} |
456 | {Currently supported controllers - "memory"} |
457 | |
458 | checkreqprot [SELINUX] Set initial checkreqprot flag value. |
459 | Format: { "0" | "1" } |
460 | See security/selinux/Kconfig help text. |
461 | 0 -- check protection applied by kernel (includes |
462 | any implied execute protection). |
463 | 1 -- check protection requested by application. |
464 | Default value is set via a kernel config option. |
465 | Value can be changed at runtime via |
466 | /selinux/checkreqprot. |
467 | |
468 | cio_ignore= [S390] |
469 | See Documentation/s390/CommonIO for details. |
470 | |
471 | clock= [BUGS=X86-32, HW] gettimeofday clocksource override. |
472 | [Deprecated] |
473 | Forces specified clocksource (if available) to be used |
474 | when calculating gettimeofday(). If specified |
475 | clocksource is not available, it defaults to PIT. |
476 | Format: { pit | tsc | cyclone | pmtmr } |
477 | |
478 | clocksource= Override the default clocksource |
479 | Format: <string> |
480 | Override the default clocksource and use the clocksource |
481 | with the name specified. |
482 | Some clocksource names to choose from, depending on |
483 | the platform: |
484 | [all] jiffies (this is the base, fallback clocksource) |
485 | [ACPI] acpi_pm |
486 | [ARM] imx_timer1,OSTS,netx_timer,mpu_timer2, |
487 | pxa_timer,timer3,32k_counter,timer0_1 |
488 | [AVR32] avr32 |
489 | [X86-32] pit,hpet,tsc; |
490 | scx200_hrt on Geode; cyclone on IBM x440 |
491 | [MIPS] MIPS |
492 | [PARISC] cr16 |
493 | [S390] tod |
494 | [SH] SuperH |
495 | [SPARC64] tick |
496 | [X86-64] hpet,tsc |
497 | |
498 | clearcpuid=BITNUM [X86] |
499 | Disable CPUID feature X for the kernel. See |
500 | arch/x86/include/asm/cpufeature.h for the valid bit |
501 | numbers. Note the Linux specific bits are not necessarily |
502 | stable over kernel options, but the vendor specific |
503 | ones should be. |
504 | Also note that user programs calling CPUID directly |
505 | or using the feature without checking anything |
506 | will still see it. This just prevents it from |
507 | being used by the kernel or shown in /proc/cpuinfo. |
508 | Also note the kernel might malfunction if you disable |
509 | some critical bits. |
510 | |
511 | cmo_free_hint= [PPC] Format: { yes | no } |
512 | Specify whether pages are marked as being inactive |
513 | when they are freed. This is used in CMO environments |
514 | to determine OS memory pressure for page stealing by |
515 | a hypervisor. |
516 | Default: yes |
517 | |
518 | code_bytes [X86] How many bytes of object code to print |
519 | in an oops report. |
520 | Range: 0 - 8192 |
521 | Default: 64 |
522 | |
523 | com20020= [HW,NET] ARCnet - COM20020 chipset |
524 | Format: |
525 | <io>[,<irq>[,<nodeID>[,<backplane>[,<ckp>[,<timeout>]]]]] |
526 | |
527 | com90io= [HW,NET] ARCnet - COM90xx chipset (IO-mapped buffers) |
528 | Format: <io>[,<irq>] |
529 | |
530 | com90xx= [HW,NET] |
531 | ARCnet - COM90xx chipset (memory-mapped buffers) |
532 | Format: <io>[,<irq>[,<memstart>]] |
533 | |
534 | condev= [HW,S390] console device |
535 | conmode= |
536 | |
537 | console= [KNL] Output console device and options. |
538 | |
539 | tty<n> Use the virtual console device <n>. |
540 | |
541 | ttyS<n>[,options] |
542 | ttyUSB0[,options] |
543 | Use the specified serial port. The options are of |
544 | the form "bbbbpnf", where "bbbb" is the baud rate, |
545 | "p" is parity ("n", "o", or "e"), "n" is number of |
546 | bits, and "f" is flow control ("r" for RTS or |
547 | omit it). Default is "9600n8". |
548 | |
549 | See Documentation/serial-console.txt for more |
550 | information. See |
551 | Documentation/networking/netconsole.txt for an |
552 | alternative. |
553 | |
554 | uart[8250],io,<addr>[,options] |
555 | uart[8250],mmio,<addr>[,options] |
556 | Start an early, polled-mode console on the 8250/16550 |
557 | UART at the specified I/O port or MMIO address, |
558 | switching to the matching ttyS device later. The |
559 | options are the same as for ttyS, above. |
560 | |
561 | If the device connected to the port is not a TTY but a braille |
562 | device, prepend "brl," before the device type, for instance |
563 | console=brl,ttyS0 |
564 | For now, only VisioBraille is supported. |
565 | |
566 | consoleblank= [KNL] The console blank (screen saver) timeout in |
567 | seconds. Defaults to 10*60 = 10mins. A value of 0 |
568 | disables the blank timer. |
569 | |
570 | coredump_filter= |
571 | [KNL] Change the default value for |
572 | /proc/<pid>/coredump_filter. |
573 | See also Documentation/filesystems/proc.txt. |
574 | |
575 | cpuidle.off=1 [CPU_IDLE] |
576 | disable the cpuidle sub-system |
577 | |
578 | cpcihp_generic= [HW,PCI] Generic port I/O CompactPCI driver |
579 | Format: |
580 | <first_slot>,<last_slot>,<port>,<enum_bit>[,<debug>] |
581 | |
582 | crashkernel=size[KMG][@offset[KMG]] |
583 | [KNL] Using kexec, Linux can switch to a 'crash kernel' |
584 | upon panic. This parameter reserves the physical |
585 | memory region [offset, offset + size] for that kernel |
586 | image. If '@offset' is omitted, then a suitable offset |
587 | is selected automatically. Check |
588 | Documentation/kdump/kdump.txt for further details. |
589 | |
590 | crashkernel=range1:size1[,range2:size2,...][@offset] |
591 | [KNL] Same as above, but depends on the memory |
592 | in the running system. The syntax of range is |
593 | start-[end] where start and end are both |
594 | a memory unit (amount[KMG]). See also |
595 | Documentation/kdump/kdump.txt for an example. |
596 | |
597 | cs89x0_dma= [HW,NET] |
598 | Format: <dma> |
599 | |
600 | cs89x0_media= [HW,NET] |
601 | Format: { rj45 | aui | bnc } |
602 | |
603 | dasd= [HW,NET] |
604 | See header of drivers/s390/block/dasd_devmap.c. |
605 | |
606 | db9.dev[2|3]= [HW,JOY] Multisystem joystick support via parallel port |
607 | (one device per port) |
608 | Format: <port#>,<type> |
609 | See also Documentation/input/joystick-parport.txt |
610 | |
611 | ddebug_query= [KNL,DYNAMIC_DEBUG] Enable debug messages at early boot |
612 | time. See Documentation/dynamic-debug-howto.txt for |
613 | details. |
614 | |
615 | debug [KNL] Enable kernel debugging (events log level). |
616 | |
617 | debug_locks_verbose= |
618 | [KNL] verbose self-tests |
619 | Format=<0|1> |
620 | Print debugging info while doing the locking API |
621 | self-tests. |
622 | We default to 0 (no extra messages), setting it to |
623 | 1 will print _a lot_ more information - normally |
624 | only useful to kernel developers. |
625 | |
626 | debug_objects [KNL] Enable object debugging |
627 | |
628 | no_debug_objects |
629 | [KNL] Disable object debugging |
630 | |
631 | debug_guardpage_minorder= |
632 | [KNL] When CONFIG_DEBUG_PAGEALLOC is set, this |
633 | parameter allows control of the order of pages that will |
634 | be intentionally kept free (and hence protected) by the |
635 | buddy allocator. Bigger value increase the probability |
636 | of catching random memory corruption, but reduce the |
637 | amount of memory for normal system use. The maximum |
638 | possible value is MAX_ORDER/2. Setting this parameter |
639 | to 1 or 2 should be enough to identify most random |
640 | memory corruption problems caused by bugs in kernel or |
641 | driver code when a CPU writes to (or reads from) a |
642 | random memory location. Note that there exists a class |
643 | of memory corruptions problems caused by buggy H/W or |
644 | F/W or by drivers badly programing DMA (basically when |
645 | memory is written at bus level and the CPU MMU is |
646 | bypassed) which are not detectable by |
647 | CONFIG_DEBUG_PAGEALLOC, hence this option will not help |
648 | tracking down these problems. |
649 | |
650 | debugpat [X86] Enable PAT debugging |
651 | |
652 | decnet.addr= [HW,NET] |
653 | Format: <area>[,<node>] |
654 | See also Documentation/networking/decnet.txt. |
655 | |
656 | default_hugepagesz= |
657 | [same as hugepagesz=] The size of the default |
658 | HugeTLB page size. This is the size represented by |
659 | the legacy /proc/ hugepages APIs, used for SHM, and |
660 | default size when mounting hugetlbfs filesystems. |
661 | Defaults to the default architecture's huge page size |
662 | if not specified. |
663 | |
664 | dhash_entries= [KNL] |
665 | Set number of hash buckets for dentry cache. |
666 | |
667 | digi= [HW,SERIAL] |
668 | IO parameters + enable/disable command. |
669 | |
670 | digiepca= [HW,SERIAL] |
671 | See drivers/char/README.epca and |
672 | Documentation/serial/digiepca.txt. |
673 | |
674 | disable= [IPV6] |
675 | See Documentation/networking/ipv6.txt. |
676 | |
677 | disable_ddw [PPC/PSERIES] |
678 | Disable Dynamic DMA Window support. Use this if |
679 | to workaround buggy firmware. |
680 | |
681 | disable_ipv6= [IPV6] |
682 | See Documentation/networking/ipv6.txt. |
683 | |
684 | disable_mtrr_cleanup [X86] |
685 | The kernel tries to adjust MTRR layout from continuous |
686 | to discrete, to make X server driver able to add WB |
687 | entry later. This parameter disables that. |
688 | |
689 | disable_mtrr_trim [X86, Intel and AMD only] |
690 | By default the kernel will trim any uncacheable |
691 | memory out of your available memory pool based on |
692 | MTRR settings. This parameter disables that behavior, |
693 | possibly causing your machine to run very slowly. |
694 | |
695 | disable_timer_pin_1 [X86] |
696 | Disable PIN 1 of APIC timer |
697 | Can be useful to work around chipset bugs. |
698 | |
699 | dma_debug=off If the kernel is compiled with DMA_API_DEBUG support, |
700 | this option disables the debugging code at boot. |
701 | |
702 | dma_debug_entries=<number> |
703 | This option allows to tune the number of preallocated |
704 | entries for DMA-API debugging code. One entry is |
705 | required per DMA-API allocation. Use this if the |
706 | DMA-API debugging code disables itself because the |
707 | architectural default is too low. |
708 | |
709 | dma_debug_driver=<driver_name> |
710 | With this option the DMA-API debugging driver |
711 | filter feature can be enabled at boot time. Just |
712 | pass the driver to filter for as the parameter. |
713 | The filter can be disabled or changed to another |
714 | driver later using sysfs. |
715 | |
716 | dscc4.setup= [NET] |
717 | |
718 | earlycon= [KNL] Output early console device and options. |
719 | uart[8250],io,<addr>[,options] |
720 | uart[8250],mmio,<addr>[,options] |
721 | uart[8250],mmio32,<addr>[,options] |
722 | Start an early, polled-mode console on the 8250/16550 |
723 | UART at the specified I/O port or MMIO address. |
724 | MMIO inter-register address stride is either 8-bit |
725 | (mmio) or 32-bit (mmio32). |
726 | The options are the same as for ttyS, above. |
727 | |
728 | earlyprintk= [X86,SH,BLACKFIN] |
729 | earlyprintk=vga |
730 | earlyprintk=serial[,ttySn[,baudrate]] |
731 | earlyprintk=ttySn[,baudrate] |
732 | earlyprintk=dbgp[debugController#] |
733 | |
734 | Append ",keep" to not disable it when the real console |
735 | takes over. |
736 | |
737 | Only vga or serial or usb debug port at a time. |
738 | |
739 | Currently only ttyS0 and ttyS1 are supported. |
740 | |
741 | Interaction with the standard serial driver is not |
742 | very good. |
743 | |
744 | The VGA output is eventually overwritten by the real |
745 | console. |
746 | |
747 | ekgdboc= [X86,KGDB] Allow early kernel console debugging |
748 | ekgdboc=kbd |
749 | |
750 | This is designed to be used in conjunction with |
751 | the boot argument: earlyprintk=vga |
752 | |
753 | edd= [EDD] |
754 | Format: {"off" | "on" | "skip[mbr]"} |
755 | |
756 | eisa_irq_edge= [PARISC,HW] |
757 | See header of drivers/parisc/eisa.c. |
758 | |
759 | elanfreq= [X86-32] |
760 | See comment before function elanfreq_setup() in |
761 | arch/x86/kernel/cpu/cpufreq/elanfreq.c. |
762 | |
763 | elevator= [IOSCHED] |
764 | Format: {"cfq" | "deadline" | "noop"} |
765 | See Documentation/block/cfq-iosched.txt and |
766 | Documentation/block/deadline-iosched.txt for details. |
767 | |
768 | elfcorehdr=[size[KMG]@]offset[KMG] [IA64,PPC,SH,X86,S390] |
769 | Specifies physical address of start of kernel core |
770 | image elf header and optionally the size. Generally |
771 | kexec loader will pass this option to capture kernel. |
772 | See Documentation/kdump/kdump.txt for details. |
773 | |
774 | enable_mtrr_cleanup [X86] |
775 | The kernel tries to adjust MTRR layout from continuous |
776 | to discrete, to make X server driver able to add WB |
777 | entry later. This parameter enables that. |
778 | |
779 | enable_timer_pin_1 [X86] |
780 | Enable PIN 1 of APIC timer |
781 | Can be useful to work around chipset bugs |
782 | (in particular on some ATI chipsets). |
783 | The kernel tries to set a reasonable default. |
784 | |
785 | enforcing [SELINUX] Set initial enforcing status. |
786 | Format: {"0" | "1"} |
787 | See security/selinux/Kconfig help text. |
788 | 0 -- permissive (log only, no denials). |
789 | 1 -- enforcing (deny and log). |
790 | Default value is 0. |
791 | Value can be changed at runtime via /selinux/enforce. |
792 | |
793 | erst_disable [ACPI] |
794 | Disable Error Record Serialization Table (ERST) |
795 | support. |
796 | |
797 | ether= [HW,NET] Ethernet cards parameters |
798 | This option is obsoleted by the "netdev=" option, which |
799 | has equivalent usage. See its documentation for details. |
800 | |
801 | evm= [EVM] |
802 | Format: { "fix" } |
803 | Permit 'security.evm' to be updated regardless of |
804 | current integrity status. |
805 | |
806 | failslab= |
807 | fail_page_alloc= |
808 | fail_make_request=[KNL] |
809 | General fault injection mechanism. |
810 | Format: <interval>,<probability>,<space>,<times> |
811 | See also Documentation/fault-injection/. |
812 | |
813 | floppy= [HW] |
814 | See Documentation/blockdev/floppy.txt. |
815 | |
816 | force_pal_cache_flush |
817 | [IA-64] Avoid check_sal_cache_flush which may hang on |
818 | buggy SAL_CACHE_FLUSH implementations. Using this |
819 | parameter will force ia64_sal_cache_flush to call |
820 | ia64_pal_cache_flush instead of SAL_CACHE_FLUSH. |
821 | |
822 | ftrace=[tracer] |
823 | [FTRACE] will set and start the specified tracer |
824 | as early as possible in order to facilitate early |
825 | boot debugging. |
826 | |
827 | ftrace_dump_on_oops[=orig_cpu] |
828 | [FTRACE] will dump the trace buffers on oops. |
829 | If no parameter is passed, ftrace will dump |
830 | buffers of all CPUs, but if you pass orig_cpu, it will |
831 | dump only the buffer of the CPU that triggered the |
832 | oops. |
833 | |
834 | ftrace_filter=[function-list] |
835 | [FTRACE] Limit the functions traced by the function |
836 | tracer at boot up. function-list is a comma separated |
837 | list of functions. This list can be changed at run |
838 | time by the set_ftrace_filter file in the debugfs |
839 | tracing directory. |
840 | |
841 | ftrace_notrace=[function-list] |
842 | [FTRACE] Do not trace the functions specified in |
843 | function-list. This list can be changed at run time |
844 | by the set_ftrace_notrace file in the debugfs |
845 | tracing directory. |
846 | |
847 | ftrace_graph_filter=[function-list] |
848 | [FTRACE] Limit the top level callers functions traced |
849 | by the function graph tracer at boot up. |
850 | function-list is a comma separated list of functions |
851 | that can be changed at run time by the |
852 | set_graph_function file in the debugfs tracing directory. |
853 | |
854 | gamecon.map[2|3]= |
855 | [HW,JOY] Multisystem joystick and NES/SNES/PSX pad |
856 | support via parallel port (up to 5 devices per port) |
857 | Format: <port#>,<pad1>,<pad2>,<pad3>,<pad4>,<pad5> |
858 | See also Documentation/input/joystick-parport.txt |
859 | |
860 | gamma= [HW,DRM] |
861 | |
862 | gart_fix_e820= [X86_64] disable the fix e820 for K8 GART |
863 | Format: off | on |
864 | default: on |
865 | |
866 | gcov_persist= [GCOV] When non-zero (default), profiling data for |
867 | kernel modules is saved and remains accessible via |
868 | debugfs, even when the module is unloaded/reloaded. |
869 | When zero, profiling data is discarded and associated |
870 | debugfs files are removed at module unload time. |
871 | |
872 | gpt [EFI] Forces disk with valid GPT signature but |
873 | invalid Protective MBR to be treated as GPT. |
874 | |
875 | hashdist= [KNL,NUMA] Large hashes allocated during boot |
876 | are distributed across NUMA nodes. Defaults on |
877 | for 64-bit NUMA, off otherwise. |
878 | Format: 0 | 1 (for off | on) |
879 | |
880 | hcl= [IA-64] SGI's Hardware Graph compatibility layer |
881 | |
882 | hd= [EIDE] (E)IDE hard drive subsystem geometry |
883 | Format: <cyl>,<head>,<sect> |
884 | |
885 | hest_disable [ACPI] |
886 | Disable Hardware Error Source Table (HEST) support; |
887 | corresponding firmware-first mode error processing |
888 | logic will be disabled. |
889 | |
890 | highmem=nn[KMG] [KNL,BOOT] forces the highmem zone to have an exact |
891 | size of <nn>. This works even on boxes that have no |
892 | highmem otherwise. This also works to reduce highmem |
893 | size on bigger boxes. |
894 | |
895 | highres= [KNL] Enable/disable high resolution timer mode. |
896 | Valid parameters: "on", "off" |
897 | Default: "on" |
898 | |
899 | hisax= [HW,ISDN] |
900 | See Documentation/isdn/README.HiSax. |
901 | |
902 | hlt [BUGS=ARM,SH] |
903 | |
904 | hpet= [X86-32,HPET] option to control HPET usage |
905 | Format: { enable (default) | disable | force | |
906 | verbose } |
907 | disable: disable HPET and use PIT instead |
908 | force: allow force enabled of undocumented chips (ICH4, |
909 | VIA, nVidia) |
910 | verbose: show contents of HPET registers during setup |
911 | |
912 | hugepages= [HW,X86-32,IA-64] HugeTLB pages to allocate at boot. |
913 | hugepagesz= [HW,IA-64,PPC,X86-64] The size of the HugeTLB pages. |
914 | On x86-64 and powerpc, this option can be specified |
915 | multiple times interleaved with hugepages= to reserve |
916 | huge pages of different sizes. Valid pages sizes on |
917 | x86-64 are 2M (when the CPU supports "pse") and 1G |
918 | (when the CPU supports the "pdpe1gb" cpuinfo flag) |
919 | Note that 1GB pages can only be allocated at boot time |
920 | using hugepages= and not freed afterwards. |
921 | |
922 | hvc_iucv= [S390] Number of z/VM IUCV hypervisor console (HVC) |
923 | terminal devices. Valid values: 0..8 |
924 | hvc_iucv_allow= [S390] Comma-separated list of z/VM user IDs. |
925 | If specified, z/VM IUCV HVC accepts connections |
926 | from listed z/VM user IDs only. |
927 | |
928 | keep_bootcon [KNL] |
929 | Do not unregister boot console at start. This is only |
930 | useful for debugging when something happens in the window |
931 | between unregistering the boot console and initializing |
932 | the real console. |
933 | |
934 | i2c_bus= [HW] Override the default board specific I2C bus speed |
935 | or register an additional I2C bus that is not |
936 | registered from board initialization code. |
937 | Format: |
938 | <bus_id>,<clkrate> |
939 | |
940 | i8042.debug [HW] Toggle i8042 debug mode |
941 | i8042.direct [HW] Put keyboard port into non-translated mode |
942 | i8042.dumbkbd [HW] Pretend that controller can only read data from |
943 | keyboard and cannot control its state |
944 | (Don't attempt to blink the leds) |
945 | i8042.noaux [HW] Don't check for auxiliary (== mouse) port |
946 | i8042.nokbd [HW] Don't check/create keyboard port |
947 | i8042.noloop [HW] Disable the AUX Loopback command while probing |
948 | for the AUX port |
949 | i8042.nomux [HW] Don't check presence of an active multiplexing |
950 | controller |
951 | i8042.nopnp [HW] Don't use ACPIPnP / PnPBIOS to discover KBD/AUX |
952 | controllers |
953 | i8042.notimeout [HW] Ignore timeout condition signalled by conroller |
954 | i8042.reset [HW] Reset the controller during init and cleanup |
955 | i8042.unlock [HW] Unlock (ignore) the keylock |
956 | |
957 | i810= [HW,DRM] |
958 | |
959 | i8k.ignore_dmi [HW] Continue probing hardware even if DMI data |
960 | indicates that the driver is running on unsupported |
961 | hardware. |
962 | i8k.force [HW] Activate i8k driver even if SMM BIOS signature |
963 | does not match list of supported models. |
964 | i8k.power_status |
965 | [HW] Report power status in /proc/i8k |
966 | (disabled by default) |
967 | i8k.restricted [HW] Allow controlling fans only if SYS_ADMIN |
968 | capability is set. |
969 | |
970 | icn= [HW,ISDN] |
971 | Format: <io>[,<membase>[,<icn_id>[,<icn_id2>]]] |
972 | |
973 | ide-core.nodma= [HW] (E)IDE subsystem |
974 | Format: =0.0 to prevent dma on hda, =0.1 hdb =1.0 hdc |
975 | .vlb_clock .pci_clock .noflush .nohpa .noprobe .nowerr |
976 | .cdrom .chs .ignore_cable are additional options |
977 | See Documentation/ide/ide.txt. |
978 | |
979 | ide-pci-generic.all-generic-ide [HW] (E)IDE subsystem |
980 | Claim all unknown PCI IDE storage controllers. |
981 | |
982 | idle= [X86] |
983 | Format: idle=poll, idle=mwait, idle=halt, idle=nomwait |
984 | Poll forces a polling idle loop that can slightly |
985 | improve the performance of waking up a idle CPU, but |
986 | will use a lot of power and make the system run hot. |
987 | Not recommended. |
988 | idle=mwait: On systems which support MONITOR/MWAIT but |
989 | the kernel chose to not use it because it doesn't save |
990 | as much power as a normal idle loop, use the |
991 | MONITOR/MWAIT idle loop anyways. Performance should be |
992 | the same as idle=poll. |
993 | idle=halt: Halt is forced to be used for CPU idle. |
994 | In such case C2/C3 won't be used again. |
995 | idle=nomwait: Disable mwait for CPU C-states |
996 | |
997 | ignore_loglevel [KNL] |
998 | Ignore loglevel setting - this will print /all/ |
999 | kernel messages to the console. Useful for debugging. |
1000 | We also add it as printk module parameter, so users |
1001 | could change it dynamically, usually by |
1002 | /sys/module/printk/parameters/ignore_loglevel. |
1003 | |
1004 | ihash_entries= [KNL] |
1005 | Set number of hash buckets for inode cache. |
1006 | |
1007 | ima_audit= [IMA] |
1008 | Format: { "0" | "1" } |
1009 | 0 -- integrity auditing messages. (Default) |
1010 | 1 -- enable informational integrity auditing messages. |
1011 | |
1012 | ima_hash= [IMA] |
1013 | Format: { "sha1" | "md5" } |
1014 | default: "sha1" |
1015 | |
1016 | ima_tcb [IMA] |
1017 | Load a policy which meets the needs of the Trusted |
1018 | Computing Base. This means IMA will measure all |
1019 | programs exec'd, files mmap'd for exec, and all files |
1020 | opened for read by uid=0. |
1021 | |
1022 | init= [KNL] |
1023 | Format: <full_path> |
1024 | Run specified binary instead of /sbin/init as init |
1025 | process. |
1026 | |
1027 | initcall_debug [KNL] Trace initcalls as they are executed. Useful |
1028 | for working out where the kernel is dying during |
1029 | startup. |
1030 | |
1031 | initrd= [BOOT] Specify the location of the initial ramdisk |
1032 | |
1033 | inport.irq= [HW] Inport (ATI XL and Microsoft) busmouse driver |
1034 | Format: <irq> |
1035 | |
1036 | intel_iommu= [DMAR] Intel IOMMU driver (DMAR) option |
1037 | on |
1038 | Enable intel iommu driver. |
1039 | off |
1040 | Disable intel iommu driver. |
1041 | igfx_off [Default Off] |
1042 | By default, gfx is mapped as normal device. If a gfx |
1043 | device has a dedicated DMAR unit, the DMAR unit is |
1044 | bypassed by not enabling DMAR with this option. In |
1045 | this case, gfx device will use physical address for |
1046 | DMA. |
1047 | forcedac [x86_64] |
1048 | With this option iommu will not optimize to look |
1049 | for io virtual address below 32-bit forcing dual |
1050 | address cycle on pci bus for cards supporting greater |
1051 | than 32-bit addressing. The default is to look |
1052 | for translation below 32-bit and if not available |
1053 | then look in the higher range. |
1054 | strict [Default Off] |
1055 | With this option on every unmap_single operation will |
1056 | result in a hardware IOTLB flush operation as opposed |
1057 | to batching them for performance. |
1058 | sp_off [Default Off] |
1059 | By default, super page will be supported if Intel IOMMU |
1060 | has the capability. With this option, super page will |
1061 | not be supported. |
1062 | |
1063 | intel_idle.max_cstate= [KNL,HW,ACPI,X86] |
1064 | 0 disables intel_idle and fall back on acpi_idle. |
1065 | 1 to 6 specify maximum depth of C-state. |
1066 | |
1067 | intremap= [X86-64, Intel-IOMMU] |
1068 | on enable Interrupt Remapping (default) |
1069 | off disable Interrupt Remapping |
1070 | nosid disable Source ID checking |
1071 | no_x2apic_optout |
1072 | BIOS x2APIC opt-out request will be ignored |
1073 | |
1074 | inttest= [IA-64] |
1075 | |
1076 | iomem= Disable strict checking of access to MMIO memory |
1077 | strict regions from userspace. |
1078 | relaxed |
1079 | |
1080 | iommu= [x86] |
1081 | off |
1082 | force |
1083 | noforce |
1084 | biomerge |
1085 | panic |
1086 | nopanic |
1087 | merge |
1088 | nomerge |
1089 | forcesac |
1090 | soft |
1091 | pt [x86, IA-64] |
1092 | group_mf [x86, IA-64] |
1093 | |
1094 | |
1095 | io7= [HW] IO7 for Marvel based alpha systems |
1096 | See comment before marvel_specify_io7 in |
1097 | arch/alpha/kernel/core_marvel.c. |
1098 | |
1099 | io_delay= [X86] I/O delay method |
1100 | 0x80 |
1101 | Standard port 0x80 based delay |
1102 | 0xed |
1103 | Alternate port 0xed based delay (needed on some systems) |
1104 | udelay |
1105 | Simple two microseconds delay |
1106 | none |
1107 | No delay |
1108 | |
1109 | ip= [IP_PNP] |
1110 | See Documentation/filesystems/nfs/nfsroot.txt. |
1111 | |
1112 | ip2= [HW] Set IO/IRQ pairs for up to 4 IntelliPort boards |
1113 | See comment before ip2_setup() in |
1114 | drivers/char/ip2/ip2base.c. |
1115 | |
1116 | irqfixup [HW] |
1117 | When an interrupt is not handled search all handlers |
1118 | for it. Intended to get systems with badly broken |
1119 | firmware running. |
1120 | |
1121 | irqpoll [HW] |
1122 | When an interrupt is not handled search all handlers |
1123 | for it. Also check all handlers each timer |
1124 | interrupt. Intended to get systems with badly broken |
1125 | firmware running. |
1126 | |
1127 | isapnp= [ISAPNP] |
1128 | Format: <RDP>,<reset>,<pci_scan>,<verbosity> |
1129 | |
1130 | isolcpus= [KNL,SMP] Isolate CPUs from the general scheduler. |
1131 | Format: |
1132 | <cpu number>,...,<cpu number> |
1133 | or |
1134 | <cpu number>-<cpu number> |
1135 | (must be a positive range in ascending order) |
1136 | or a mixture |
1137 | <cpu number>,...,<cpu number>-<cpu number> |
1138 | |
1139 | This option can be used to specify one or more CPUs |
1140 | to isolate from the general SMP balancing and scheduling |
1141 | algorithms. You can move a process onto or off an |
1142 | "isolated" CPU via the CPU affinity syscalls or cpuset. |
1143 | <cpu number> begins at 0 and the maximum value is |
1144 | "number of CPUs in system - 1". |
1145 | |
1146 | This option is the preferred way to isolate CPUs. The |
1147 | alternative -- manually setting the CPU mask of all |
1148 | tasks in the system -- can cause problems and |
1149 | suboptimal load balancer performance. |
1150 | |
1151 | iucv= [HW,NET] |
1152 | |
1153 | js= [HW,JOY] Analog joystick |
1154 | See Documentation/input/joystick.txt. |
1155 | |
1156 | keepinitrd [HW,ARM] |
1157 | |
1158 | kernelcore=nn[KMG] [KNL,X86,IA-64,PPC] This parameter |
1159 | specifies the amount of memory usable by the kernel |
1160 | for non-movable allocations. The requested amount is |
1161 | spread evenly throughout all nodes in the system. The |
1162 | remaining memory in each node is used for Movable |
1163 | pages. In the event, a node is too small to have both |
1164 | kernelcore and Movable pages, kernelcore pages will |
1165 | take priority and other nodes will have a larger number |
1166 | of kernelcore pages. The Movable zone is used for the |
1167 | allocation of pages that may be reclaimed or moved |
1168 | by the page migration subsystem. This means that |
1169 | HugeTLB pages may not be allocated from this zone. |
1170 | Note that allocations like PTEs-from-HighMem still |
1171 | use the HighMem zone if it exists, and the Normal |
1172 | zone if it does not. |
1173 | |
1174 | kgdbdbgp= [KGDB,HW] kgdb over EHCI usb debug port. |
1175 | Format: <Controller#>[,poll interval] |
1176 | The controller # is the number of the ehci usb debug |
1177 | port as it is probed via PCI. The poll interval is |
1178 | optional and is the number seconds in between |
1179 | each poll cycle to the debug port in case you need |
1180 | the functionality for interrupting the kernel with |
1181 | gdb or control-c on the dbgp connection. When |
1182 | not using this parameter you use sysrq-g to break into |
1183 | the kernel debugger. |
1184 | |
1185 | kgdboc= [KGDB,HW] kgdb over consoles. |
1186 | Requires a tty driver that supports console polling, |
1187 | or a supported polling keyboard driver (non-usb). |
1188 | Serial only format: <serial_device>[,baud] |
1189 | keyboard only format: kbd |
1190 | keyboard and serial format: kbd,<serial_device>[,baud] |
1191 | Optional Kernel mode setting: |
1192 | kms, kbd format: kms,kbd |
1193 | kms, kbd and serial format: kms,kbd,<ser_dev>[,baud] |
1194 | |
1195 | kgdbwait [KGDB] Stop kernel execution and enter the |
1196 | kernel debugger at the earliest opportunity. |
1197 | |
1198 | kmac= [MIPS] korina ethernet MAC address. |
1199 | Configure the RouterBoard 532 series on-chip |
1200 | Ethernet adapter MAC address. |
1201 | |
1202 | kmemleak= [KNL] Boot-time kmemleak enable/disable |
1203 | Valid arguments: on, off |
1204 | Default: on |
1205 | |
1206 | kstack=N [X86] Print N words from the kernel stack |
1207 | in oops dumps. |
1208 | |
1209 | kvm.ignore_msrs=[KVM] Ignore guest accesses to unhandled MSRs. |
1210 | Default is 0 (don't ignore, but inject #GP) |
1211 | |
1212 | kvm.mmu_audit= [KVM] This is a R/W parameter which allows audit |
1213 | KVM MMU at runtime. |
1214 | Default is 0 (off) |
1215 | |
1216 | kvm-amd.nested= [KVM,AMD] Allow nested virtualization in KVM/SVM. |
1217 | Default is 1 (enabled) |
1218 | |
1219 | kvm-amd.npt= [KVM,AMD] Disable nested paging (virtualized MMU) |
1220 | for all guests. |
1221 | Default is 1 (enabled) if in 64-bit or 32-bit PAE mode. |
1222 | |
1223 | kvm-intel.ept= [KVM,Intel] Disable extended page tables |
1224 | (virtualized MMU) support on capable Intel chips. |
1225 | Default is 1 (enabled) |
1226 | |
1227 | kvm-intel.emulate_invalid_guest_state= |
1228 | [KVM,Intel] Enable emulation of invalid guest states |
1229 | Default is 0 (disabled) |
1230 | |
1231 | kvm-intel.flexpriority= |
1232 | [KVM,Intel] Disable FlexPriority feature (TPR shadow). |
1233 | Default is 1 (enabled) |
1234 | |
1235 | kvm-intel.nested= |
1236 | [KVM,Intel] Enable VMX nesting (nVMX). |
1237 | Default is 0 (disabled) |
1238 | |
1239 | kvm-intel.unrestricted_guest= |
1240 | [KVM,Intel] Disable unrestricted guest feature |
1241 | (virtualized real and unpaged mode) on capable |
1242 | Intel chips. Default is 1 (enabled) |
1243 | |
1244 | kvm-intel.vpid= [KVM,Intel] Disable Virtual Processor Identification |
1245 | feature (tagged TLBs) on capable Intel chips. |
1246 | Default is 1 (enabled) |
1247 | |
1248 | l2cr= [PPC] |
1249 | |
1250 | l3cr= [PPC] |
1251 | |
1252 | lapic [X86-32,APIC] Enable the local APIC even if BIOS |
1253 | disabled it. |
1254 | |
1255 | lapic_timer_c2_ok [X86,APIC] trust the local apic timer |
1256 | in C2 power state. |
1257 | |
1258 | libata.dma= [LIBATA] DMA control |
1259 | libata.dma=0 Disable all PATA and SATA DMA |
1260 | libata.dma=1 PATA and SATA Disk DMA only |
1261 | libata.dma=2 ATAPI (CDROM) DMA only |
1262 | libata.dma=4 Compact Flash DMA only |
1263 | Combinations also work, so libata.dma=3 enables DMA |
1264 | for disks and CDROMs, but not CFs. |
1265 | |
1266 | libata.ignore_hpa= [LIBATA] Ignore HPA limit |
1267 | libata.ignore_hpa=0 keep BIOS limits (default) |
1268 | libata.ignore_hpa=1 ignore limits, using full disk |
1269 | |
1270 | libata.noacpi [LIBATA] Disables use of ACPI in libata suspend/resume |
1271 | when set. |
1272 | Format: <int> |
1273 | |
1274 | libata.force= [LIBATA] Force configurations. The format is comma |
1275 | separated list of "[ID:]VAL" where ID is |
1276 | PORT[.DEVICE]. PORT and DEVICE are decimal numbers |
1277 | matching port, link or device. Basically, it matches |
1278 | the ATA ID string printed on console by libata. If |
1279 | the whole ID part is omitted, the last PORT and DEVICE |
1280 | values are used. If ID hasn't been specified yet, the |
1281 | configuration applies to all ports, links and devices. |
1282 | |
1283 | If only DEVICE is omitted, the parameter applies to |
1284 | the port and all links and devices behind it. DEVICE |
1285 | number of 0 either selects the first device or the |
1286 | first fan-out link behind PMP device. It does not |
1287 | select the host link. DEVICE number of 15 selects the |
1288 | host link and device attached to it. |
1289 | |
1290 | The VAL specifies the configuration to force. As long |
1291 | as there's no ambiguity shortcut notation is allowed. |
1292 | For example, both 1.5 and 1.5G would work for 1.5Gbps. |
1293 | The following configurations can be forced. |
1294 | |
1295 | * Cable type: 40c, 80c, short40c, unk, ign or sata. |
1296 | Any ID with matching PORT is used. |
1297 | |
1298 | * SATA link speed limit: 1.5Gbps or 3.0Gbps. |
1299 | |
1300 | * Transfer mode: pio[0-7], mwdma[0-4] and udma[0-7]. |
1301 | udma[/][16,25,33,44,66,100,133] notation is also |
1302 | allowed. |
1303 | |
1304 | * [no]ncq: Turn on or off NCQ. |
1305 | |
1306 | * nohrst, nosrst, norst: suppress hard, soft |
1307 | and both resets. |
1308 | |
1309 | * dump_id: dump IDENTIFY data. |
1310 | |
1311 | If there are multiple matching configurations changing |
1312 | the same attribute, the last one is used. |
1313 | |
1314 | memblock=debug [KNL] Enable memblock debug messages. |
1315 | |
1316 | load_ramdisk= [RAM] List of ramdisks to load from floppy |
1317 | See Documentation/blockdev/ramdisk.txt. |
1318 | |
1319 | lockd.nlm_grace_period=P [NFS] Assign grace period. |
1320 | Format: <integer> |
1321 | |
1322 | lockd.nlm_tcpport=N [NFS] Assign TCP port. |
1323 | Format: <integer> |
1324 | |
1325 | lockd.nlm_timeout=T [NFS] Assign timeout value. |
1326 | Format: <integer> |
1327 | |
1328 | lockd.nlm_udpport=M [NFS] Assign UDP port. |
1329 | Format: <integer> |
1330 | |
1331 | logibm.irq= [HW,MOUSE] Logitech Bus Mouse Driver |
1332 | Format: <irq> |
1333 | |
1334 | loglevel= All Kernel Messages with a loglevel smaller than the |
1335 | console loglevel will be printed to the console. It can |
1336 | also be changed with klogd or other programs. The |
1337 | loglevels are defined as follows: |
1338 | |
1339 | 0 (KERN_EMERG) system is unusable |
1340 | 1 (KERN_ALERT) action must be taken immediately |
1341 | 2 (KERN_CRIT) critical conditions |
1342 | 3 (KERN_ERR) error conditions |
1343 | 4 (KERN_WARNING) warning conditions |
1344 | 5 (KERN_NOTICE) normal but significant condition |
1345 | 6 (KERN_INFO) informational |
1346 | 7 (KERN_DEBUG) debug-level messages |
1347 | |
1348 | log_buf_len=n[KMG] Sets the size of the printk ring buffer, |
1349 | in bytes. n must be a power of two. The default |
1350 | size is set in the kernel config file. |
1351 | |
1352 | logo.nologo [FB] Disables display of the built-in Linux logo. |
1353 | This may be used to provide more screen space for |
1354 | kernel log messages and is useful when debugging |
1355 | kernel boot problems. |
1356 | |
1357 | lp=0 [LP] Specify parallel ports to use, e.g, |
1358 | lp=port[,port...] lp=none,parport0 (lp0 not configured, lp1 uses |
1359 | lp=reset first parallel port). 'lp=0' disables the |
1360 | lp=auto printer driver. 'lp=reset' (which can be |
1361 | specified in addition to the ports) causes |
1362 | attached printers to be reset. Using |
1363 | lp=port1,port2,... specifies the parallel ports |
1364 | to associate lp devices with, starting with |
1365 | lp0. A port specification may be 'none' to skip |
1366 | that lp device, or a parport name such as |
1367 | 'parport0'. Specifying 'lp=auto' instead of a |
1368 | port specification list means that device IDs |
1369 | from each port should be examined, to see if |
1370 | an IEEE 1284-compliant printer is attached; if |
1371 | so, the driver will manage that printer. |
1372 | See also header of drivers/char/lp.c. |
1373 | |
1374 | lpj=n [KNL] |
1375 | Sets loops_per_jiffy to given constant, thus avoiding |
1376 | time-consuming boot-time autodetection (up to 250 ms per |
1377 | CPU). 0 enables autodetection (default). To determine |
1378 | the correct value for your kernel, boot with normal |
1379 | autodetection and see what value is printed. Note that |
1380 | on SMP systems the preset will be applied to all CPUs, |
1381 | which is likely to cause problems if your CPUs need |
1382 | significantly divergent settings. An incorrect value |
1383 | will cause delays in the kernel to be wrong, leading to |
1384 | unpredictable I/O errors and other breakage. Although |
1385 | unlikely, in the extreme case this might damage your |
1386 | hardware. |
1387 | |
1388 | ltpc= [NET] |
1389 | Format: <io>,<irq>,<dma> |
1390 | |
1391 | machvec= [IA-64] Force the use of a particular machine-vector |
1392 | (machvec) in a generic kernel. |
1393 | Example: machvec=hpzx1_swiotlb |
1394 | |
1395 | machtype= [Loongson] Share the same kernel image file between different |
1396 | yeeloong laptop. |
1397 | Example: machtype=lemote-yeeloong-2f-7inch |
1398 | |
1399 | max_addr=nn[KMG] [KNL,BOOT,ia64] All physical memory greater |
1400 | than or equal to this physical address is ignored. |
1401 | |
1402 | maxcpus= [SMP] Maximum number of processors that an SMP kernel |
1403 | should make use of. maxcpus=n : n >= 0 limits the |
1404 | kernel to using 'n' processors. n=0 is a special case, |
1405 | it is equivalent to "nosmp", which also disables |
1406 | the IO APIC. |
1407 | |
1408 | max_loop= [LOOP] The number of loop block devices that get |
1409 | (loop.max_loop) unconditionally pre-created at init time. The default |
1410 | number is configured by BLK_DEV_LOOP_MIN_COUNT. Instead |
1411 | of statically allocating a predefined number, loop |
1412 | devices can be requested on-demand with the |
1413 | /dev/loop-control interface. |
1414 | |
1415 | mcatest= [IA-64] |
1416 | |
1417 | mce [X86-32] Machine Check Exception |
1418 | |
1419 | mce=option [X86-64] See Documentation/x86/x86_64/boot-options.txt |
1420 | |
1421 | md= [HW] RAID subsystems devices and level |
1422 | See Documentation/md.txt. |
1423 | |
1424 | mdacon= [MDA] |
1425 | Format: <first>,<last> |
1426 | Specifies range of consoles to be captured by the MDA. |
1427 | |
1428 | mem=nn[KMG] [KNL,BOOT] Force usage of a specific amount of memory |
1429 | Amount of memory to be used when the kernel is not able |
1430 | to see the whole system memory or for test. |
1431 | [X86-32] Use together with memmap= to avoid physical |
1432 | address space collisions. Without memmap= PCI devices |
1433 | could be placed at addresses belonging to unused RAM. |
1434 | |
1435 | mem=nopentium [BUGS=X86-32] Disable usage of 4MB pages for kernel |
1436 | memory. |
1437 | |
1438 | memchunk=nn[KMG] |
1439 | [KNL,SH] Allow user to override the default size for |
1440 | per-device physically contiguous DMA buffers. |
1441 | |
1442 | memmap=exactmap [KNL,X86] Enable setting of an exact |
1443 | E820 memory map, as specified by the user. |
1444 | Such memmap=exactmap lines can be constructed based on |
1445 | BIOS output or other requirements. See the memmap=nn@ss |
1446 | option description. |
1447 | |
1448 | memmap=nn[KMG]@ss[KMG] |
1449 | [KNL] Force usage of a specific region of memory |
1450 | Region of memory to be used, from ss to ss+nn. |
1451 | |
1452 | memmap=nn[KMG]#ss[KMG] |
1453 | [KNL,ACPI] Mark specific memory as ACPI data. |
1454 | Region of memory to be used, from ss to ss+nn. |
1455 | |
1456 | memmap=nn[KMG]$ss[KMG] |
1457 | [KNL,ACPI] Mark specific memory as reserved. |
1458 | Region of memory to be used, from ss to ss+nn. |
1459 | Example: Exclude memory from 0x18690000-0x1869ffff |
1460 | memmap=64K$0x18690000 |
1461 | or |
1462 | memmap=0x10000$0x18690000 |
1463 | |
1464 | memory_corruption_check=0/1 [X86] |
1465 | Some BIOSes seem to corrupt the first 64k of |
1466 | memory when doing things like suspend/resume. |
1467 | Setting this option will scan the memory |
1468 | looking for corruption. Enabling this will |
1469 | both detect corruption and prevent the kernel |
1470 | from using the memory being corrupted. |
1471 | However, its intended as a diagnostic tool; if |
1472 | repeatable BIOS-originated corruption always |
1473 | affects the same memory, you can use memmap= |
1474 | to prevent the kernel from using that memory. |
1475 | |
1476 | memory_corruption_check_size=size [X86] |
1477 | By default it checks for corruption in the low |
1478 | 64k, making this memory unavailable for normal |
1479 | use. Use this parameter to scan for |
1480 | corruption in more or less memory. |
1481 | |
1482 | memory_corruption_check_period=seconds [X86] |
1483 | By default it checks for corruption every 60 |
1484 | seconds. Use this parameter to check at some |
1485 | other rate. 0 disables periodic checking. |
1486 | |
1487 | memtest= [KNL,X86] Enable memtest |
1488 | Format: <integer> |
1489 | default : 0 <disable> |
1490 | Specifies the number of memtest passes to be |
1491 | performed. Each pass selects another test |
1492 | pattern from a given set of patterns. Memtest |
1493 | fills the memory with this pattern, validates |
1494 | memory contents and reserves bad memory |
1495 | regions that are detected. |
1496 | |
1497 | meye.*= [HW] Set MotionEye Camera parameters |
1498 | See Documentation/video4linux/meye.txt. |
1499 | |
1500 | mfgpt_irq= [IA-32] Specify the IRQ to use for the |
1501 | Multi-Function General Purpose Timers on AMD Geode |
1502 | platforms. |
1503 | |
1504 | mfgptfix [X86-32] Fix MFGPT timers on AMD Geode platforms when |
1505 | the BIOS has incorrectly applied a workaround. TinyBIOS |
1506 | version 0.98 is known to be affected, 0.99 fixes the |
1507 | problem by letting the user disable the workaround. |
1508 | |
1509 | mga= [HW,DRM] |
1510 | |
1511 | min_addr=nn[KMG] [KNL,BOOT,ia64] All physical memory below this |
1512 | physical address is ignored. |
1513 | |
1514 | mini2440= [ARM,HW,KNL] |
1515 | Format:[0..2][b][c][t] |
1516 | Default: "0tb" |
1517 | MINI2440 configuration specification: |
1518 | 0 - The attached screen is the 3.5" TFT |
1519 | 1 - The attached screen is the 7" TFT |
1520 | 2 - The VGA Shield is attached (1024x768) |
1521 | Leaving out the screen size parameter will not load |
1522 | the TFT driver, and the framebuffer will be left |
1523 | unconfigured. |
1524 | b - Enable backlight. The TFT backlight pin will be |
1525 | linked to the kernel VESA blanking code and a GPIO |
1526 | LED. This parameter is not necessary when using the |
1527 | VGA shield. |
1528 | c - Enable the s3c camera interface. |
1529 | t - Reserved for enabling touchscreen support. The |
1530 | touchscreen support is not enabled in the mainstream |
1531 | kernel as of 2.6.30, a preliminary port can be found |
1532 | in the "bleeding edge" mini2440 support kernel at |
1533 | http://repo.or.cz/w/linux-2.6/mini2440.git |
1534 | |
1535 | mminit_loglevel= |
1536 | [KNL] When CONFIG_DEBUG_MEMORY_INIT is set, this |
1537 | parameter allows control of the logging verbosity for |
1538 | the additional memory initialisation checks. A value |
1539 | of 0 disables mminit logging and a level of 4 will |
1540 | log everything. Information is printed at KERN_DEBUG |
1541 | so loglevel=8 may also need to be specified. |
1542 | |
1543 | mousedev.tap_time= |
1544 | [MOUSE] Maximum time between finger touching and |
1545 | leaving touchpad surface for touch to be considered |
1546 | a tap and be reported as a left button click (for |
1547 | touchpads working in absolute mode only). |
1548 | Format: <msecs> |
1549 | mousedev.xres= [MOUSE] Horizontal screen resolution, used for devices |
1550 | reporting absolute coordinates, such as tablets |
1551 | mousedev.yres= [MOUSE] Vertical screen resolution, used for devices |
1552 | reporting absolute coordinates, such as tablets |
1553 | |
1554 | movablecore=nn[KMG] [KNL,X86,IA-64,PPC] This parameter |
1555 | is similar to kernelcore except it specifies the |
1556 | amount of memory used for migratable allocations. |
1557 | If both kernelcore and movablecore is specified, |
1558 | then kernelcore will be at *least* the specified |
1559 | value but may be more. If movablecore on its own |
1560 | is specified, the administrator must be careful |
1561 | that the amount of memory usable for all allocations |
1562 | is not too small. |
1563 | |
1564 | MTD_Partition= [MTD] |
1565 | Format: <name>,<region-number>,<size>,<offset> |
1566 | |
1567 | MTD_Region= [MTD] Format: |
1568 | <name>,<region-number>[,<base>,<size>,<buswidth>,<altbuswidth>] |
1569 | |
1570 | mtdparts= [MTD] |
1571 | See drivers/mtd/cmdlinepart.c. |
1572 | |
1573 | multitce=off [PPC] This parameter disables the use of the pSeries |
1574 | firmware feature for updating multiple TCE entries |
1575 | at a time. |
1576 | |
1577 | onenand.bdry= [HW,MTD] Flex-OneNAND Boundary Configuration |
1578 | |
1579 | Format: [die0_boundary][,die0_lock][,die1_boundary][,die1_lock] |
1580 | |
1581 | boundary - index of last SLC block on Flex-OneNAND. |
1582 | The remaining blocks are configured as MLC blocks. |
1583 | lock - Configure if Flex-OneNAND boundary should be locked. |
1584 | Once locked, the boundary cannot be changed. |
1585 | 1 indicates lock status, 0 indicates unlock status. |
1586 | |
1587 | mtdset= [ARM] |
1588 | ARM/S3C2412 JIVE boot control |
1589 | |
1590 | See arch/arm/mach-s3c2412/mach-jive.c |
1591 | |
1592 | mtouchusb.raw_coordinates= |
1593 | [HW] Make the MicroTouch USB driver use raw coordinates |
1594 | ('y', default) or cooked coordinates ('n') |
1595 | |
1596 | mtrr_chunk_size=nn[KMG] [X86] |
1597 | used for mtrr cleanup. It is largest continuous chunk |
1598 | that could hold holes aka. UC entries. |
1599 | |
1600 | mtrr_gran_size=nn[KMG] [X86] |
1601 | Used for mtrr cleanup. It is granularity of mtrr block. |
1602 | Default is 1. |
1603 | Large value could prevent small alignment from |
1604 | using up MTRRs. |
1605 | |
1606 | mtrr_spare_reg_nr=n [X86] |
1607 | Format: <integer> |
1608 | Range: 0,7 : spare reg number |
1609 | Default : 1 |
1610 | Used for mtrr cleanup. It is spare mtrr entries number. |
1611 | Set to 2 or more if your graphical card needs more. |
1612 | |
1613 | n2= [NET] SDL Inc. RISCom/N2 synchronous serial card |
1614 | |
1615 | netdev= [NET] Network devices parameters |
1616 | Format: <irq>,<io>,<mem_start>,<mem_end>,<name> |
1617 | Note that mem_start is often overloaded to mean |
1618 | something different and driver-specific. |
1619 | This usage is only documented in each driver source |
1620 | file if at all. |
1621 | |
1622 | nf_conntrack.acct= |
1623 | [NETFILTER] Enable connection tracking flow accounting |
1624 | 0 to disable accounting |
1625 | 1 to enable accounting |
1626 | Default value is 0. |
1627 | |
1628 | nfsaddrs= [NFS] Deprecated. Use ip= instead. |
1629 | See Documentation/filesystems/nfs/nfsroot.txt. |
1630 | |
1631 | nfsroot= [NFS] nfs root filesystem for disk-less boxes. |
1632 | See Documentation/filesystems/nfs/nfsroot.txt. |
1633 | |
1634 | nfsrootdebug [NFS] enable nfsroot debugging messages. |
1635 | See Documentation/filesystems/nfs/nfsroot.txt. |
1636 | |
1637 | nfs.callback_tcpport= |
1638 | [NFS] set the TCP port on which the NFSv4 callback |
1639 | channel should listen. |
1640 | |
1641 | nfs.cache_getent= |
1642 | [NFS] sets the pathname to the program which is used |
1643 | to update the NFS client cache entries. |
1644 | |
1645 | nfs.cache_getent_timeout= |
1646 | [NFS] sets the timeout after which an attempt to |
1647 | update a cache entry is deemed to have failed. |
1648 | |
1649 | nfs.idmap_cache_timeout= |
1650 | [NFS] set the maximum lifetime for idmapper cache |
1651 | entries. |
1652 | |
1653 | nfs.enable_ino64= |
1654 | [NFS] enable 64-bit inode numbers. |
1655 | If zero, the NFS client will fake up a 32-bit inode |
1656 | number for the readdir() and stat() syscalls instead |
1657 | of returning the full 64-bit number. |
1658 | The default is to return 64-bit inode numbers. |
1659 | |
1660 | nfs.nfs4_disable_idmapping= |
1661 | [NFSv4] When set to the default of '1', this option |
1662 | ensures that both the RPC level authentication |
1663 | scheme and the NFS level operations agree to use |
1664 | numeric uids/gids if the mount is using the |
1665 | 'sec=sys' security flavour. In effect it is |
1666 | disabling idmapping, which can make migration from |
1667 | legacy NFSv2/v3 systems to NFSv4 easier. |
1668 | Servers that do not support this mode of operation |
1669 | will be autodetected by the client, and it will fall |
1670 | back to using the idmapper. |
1671 | To turn off this behaviour, set the value to '0'. |
1672 | |
1673 | nmi_debug= [KNL,AVR32,SH] Specify one or more actions to take |
1674 | when a NMI is triggered. |
1675 | Format: [state][,regs][,debounce][,die] |
1676 | |
1677 | nmi_watchdog= [KNL,BUGS=X86] Debugging features for SMP kernels |
1678 | Format: [panic,][nopanic,][num] |
1679 | Valid num: 0 |
1680 | 0 - turn nmi_watchdog off |
1681 | When panic is specified, panic when an NMI watchdog |
1682 | timeout occurs (or 'nopanic' to override the opposite |
1683 | default). |
1684 | This is useful when you use a panic=... timeout and |
1685 | need the box quickly up again. |
1686 | |
1687 | netpoll.carrier_timeout= |
1688 | [NET] Specifies amount of time (in seconds) that |
1689 | netpoll should wait for a carrier. By default netpoll |
1690 | waits 4 seconds. |
1691 | |
1692 | no387 [BUGS=X86-32] Tells the kernel to use the 387 maths |
1693 | emulation library even if a 387 maths coprocessor |
1694 | is present. |
1695 | |
1696 | no_console_suspend |
1697 | [HW] Never suspend the console |
1698 | Disable suspending of consoles during suspend and |
1699 | hibernate operations. Once disabled, debugging |
1700 | messages can reach various consoles while the rest |
1701 | of the system is being put to sleep (ie, while |
1702 | debugging driver suspend/resume hooks). This may |
1703 | not work reliably with all consoles, but is known |
1704 | to work with serial and VGA consoles. |
1705 | To facilitate more flexible debugging, we also add |
1706 | console_suspend, a printk module parameter to control |
1707 | it. Users could use console_suspend (usually |
1708 | /sys/module/printk/parameters/console_suspend) to |
1709 | turn on/off it dynamically. |
1710 | |
1711 | noaliencache [MM, NUMA, SLAB] Disables the allocation of alien |
1712 | caches in the slab allocator. Saves per-node memory, |
1713 | but will impact performance. |
1714 | |
1715 | noalign [KNL,ARM] |
1716 | |
1717 | noapic [SMP,APIC] Tells the kernel to not make use of any |
1718 | IOAPICs that may be present in the system. |
1719 | |
1720 | noautogroup Disable scheduler automatic task group creation. |
1721 | |
1722 | nobats [PPC] Do not use BATs for mapping kernel lowmem |
1723 | on "Classic" PPC cores. |
1724 | |
1725 | nocache [ARM] |
1726 | |
1727 | noclflush [BUGS=X86] Don't use the CLFLUSH instruction |
1728 | |
1729 | nodelayacct [KNL] Disable per-task delay accounting |
1730 | |
1731 | nodisconnect [HW,SCSI,M68K] Disables SCSI disconnects. |
1732 | |
1733 | nodsp [SH] Disable hardware DSP at boot time. |
1734 | |
1735 | noefi [X86] Disable EFI runtime services support. |
1736 | |
1737 | noexec [IA-64] |
1738 | |
1739 | noexec [X86] |
1740 | On X86-32 available only on PAE configured kernels. |
1741 | noexec=on: enable non-executable mappings (default) |
1742 | noexec=off: disable non-executable mappings |
1743 | |
1744 | nosmep [X86] |
1745 | Disable SMEP (Supervisor Mode Execution Protection) |
1746 | even if it is supported by processor. |
1747 | |
1748 | noexec32 [X86-64] |
1749 | This affects only 32-bit executables. |
1750 | noexec32=on: enable non-executable mappings (default) |
1751 | read doesn't imply executable mappings |
1752 | noexec32=off: disable non-executable mappings |
1753 | read implies executable mappings |
1754 | |
1755 | nofpu [SH] Disable hardware FPU at boot time. |
1756 | |
1757 | nofxsr [BUGS=X86-32] Disables x86 floating point extended |
1758 | register save and restore. The kernel will only save |
1759 | legacy floating-point registers on task switch. |
1760 | |
1761 | noxsave [BUGS=X86] Disables x86 extended register state save |
1762 | and restore using xsave. The kernel will fallback to |
1763 | enabling legacy floating-point and sse state. |
1764 | |
1765 | nohlt [BUGS=ARM,SH] Tells the kernel that the sleep(SH) or |
1766 | wfi(ARM) instruction doesn't work correctly and not to |
1767 | use it. This is also useful when using JTAG debugger. |
1768 | |
1769 | no-hlt [BUGS=X86-32] Tells the kernel that the hlt |
1770 | instruction doesn't work correctly and not to |
1771 | use it. |
1772 | |
1773 | no_file_caps Tells the kernel not to honor file capabilities. The |
1774 | only way then for a file to be executed with privilege |
1775 | is to be setuid root or executed by root. |
1776 | |
1777 | nohalt [IA-64] Tells the kernel not to use the power saving |
1778 | function PAL_HALT_LIGHT when idle. This increases |
1779 | power-consumption. On the positive side, it reduces |
1780 | interrupt wake-up latency, which may improve performance |
1781 | in certain environments such as networked servers or |
1782 | real-time systems. |
1783 | |
1784 | nohz= [KNL] Boottime enable/disable dynamic ticks |
1785 | Valid arguments: on, off |
1786 | Default: on |
1787 | |
1788 | noiotrap [SH] Disables trapped I/O port accesses. |
1789 | |
1790 | noirqdebug [X86-32] Disables the code which attempts to detect and |
1791 | disable unhandled interrupt sources. |
1792 | |
1793 | no_timer_check [X86,APIC] Disables the code which tests for |
1794 | broken timer IRQ sources. |
1795 | |
1796 | noisapnp [ISAPNP] Disables ISA PnP code. |
1797 | |
1798 | noinitrd [RAM] Tells the kernel not to load any configured |
1799 | initial RAM disk. |
1800 | |
1801 | nointremap [X86-64, Intel-IOMMU] Do not enable interrupt |
1802 | remapping. |
1803 | [Deprecated - use intremap=off] |
1804 | |
1805 | nointroute [IA-64] |
1806 | |
1807 | nojitter [IA-64] Disables jitter checking for ITC timers. |
1808 | |
1809 | no-kvmclock [X86,KVM] Disable paravirtualized KVM clock driver |
1810 | |
1811 | no-kvmapf [X86,KVM] Disable paravirtualized asynchronous page |
1812 | fault handling. |
1813 | |
1814 | no-steal-acc [X86,KVM] Disable paravirtualized steal time accounting. |
1815 | steal time is computed, but won't influence scheduler |
1816 | behaviour |
1817 | |
1818 | nolapic [X86-32,APIC] Do not enable or use the local APIC. |
1819 | |
1820 | nolapic_timer [X86-32,APIC] Do not use the local APIC timer. |
1821 | |
1822 | noltlbs [PPC] Do not use large page/tlb entries for kernel |
1823 | lowmem mapping on PPC40x. |
1824 | |
1825 | nomca [IA-64] Disable machine check abort handling |
1826 | |
1827 | nomce [X86-32] Machine Check Exception |
1828 | |
1829 | nomfgpt [X86-32] Disable Multi-Function General Purpose |
1830 | Timer usage (for AMD Geode machines). |
1831 | |
1832 | nonmi_ipi [X86] Disable using NMI IPIs during panic/reboot to |
1833 | shutdown the other cpus. Instead use the REBOOT_VECTOR |
1834 | irq. |
1835 | |
1836 | nopat [X86] Disable PAT (page attribute table extension of |
1837 | pagetables) support. |
1838 | |
1839 | norandmaps Don't use address space randomization. Equivalent to |
1840 | echo 0 > /proc/sys/kernel/randomize_va_space |
1841 | |
1842 | noreplace-paravirt [X86,IA-64,PV_OPS] Don't patch paravirt_ops |
1843 | |
1844 | noreplace-smp [X86-32,SMP] Don't replace SMP instructions |
1845 | with UP alternatives |
1846 | |
1847 | noresidual [PPC] Don't use residual data on PReP machines. |
1848 | |
1849 | nordrand [X86] Disable the direct use of the RDRAND |
1850 | instruction even if it is supported by the |
1851 | processor. RDRAND is still available to user |
1852 | space applications. |
1853 | |
1854 | noresume [SWSUSP] Disables resume and restores original swap |
1855 | space. |
1856 | |
1857 | no-scroll [VGA] Disables scrollback. |
1858 | This is required for the Braillex ib80-piezo Braille |
1859 | reader made by F.H. Papenmeier (Germany). |
1860 | |
1861 | nosbagart [IA-64] |
1862 | |
1863 | nosep [BUGS=X86-32] Disables x86 SYSENTER/SYSEXIT support. |
1864 | |
1865 | nosmp [SMP] Tells an SMP kernel to act as a UP kernel, |
1866 | and disable the IO APIC. legacy for "maxcpus=0". |
1867 | |
1868 | nosoftlockup [KNL] Disable the soft-lockup detector. |
1869 | |
1870 | nosync [HW,M68K] Disables sync negotiation for all devices. |
1871 | |
1872 | notsc [BUGS=X86-32] Disable Time Stamp Counter |
1873 | |
1874 | nousb [USB] Disable the USB subsystem |
1875 | |
1876 | nowatchdog [KNL] Disable the lockup detector (NMI watchdog). |
1877 | |
1878 | nowb [ARM] |
1879 | |
1880 | nox2apic [X86-64,APIC] Do not enable x2APIC mode. |
1881 | |
1882 | nptcg= [IA-64] Override max number of concurrent global TLB |
1883 | purges which is reported from either PAL_VM_SUMMARY or |
1884 | SAL PALO. |
1885 | |
1886 | nr_cpus= [SMP] Maximum number of processors that an SMP kernel |
1887 | could support. nr_cpus=n : n >= 1 limits the kernel to |
1888 | supporting 'n' processors. Later in runtime you can not |
1889 | use hotplug cpu feature to put more cpu back to online. |
1890 | just like you compile the kernel NR_CPUS=n |
1891 | |
1892 | nr_uarts= [SERIAL] maximum number of UARTs to be registered. |
1893 | |
1894 | numa_zonelist_order= [KNL, BOOT] Select zonelist order for NUMA. |
1895 | one of ['zone', 'node', 'default'] can be specified |
1896 | This can be set from sysctl after boot. |
1897 | See Documentation/sysctl/vm.txt for details. |
1898 | |
1899 | ohci1394_dma=early [HW] enable debugging via the ohci1394 driver. |
1900 | See Documentation/debugging-via-ohci1394.txt for more |
1901 | info. |
1902 | |
1903 | olpc_ec_timeout= [OLPC] ms delay when issuing EC commands |
1904 | Rather than timing out after 20 ms if an EC |
1905 | command is not properly ACKed, override the length |
1906 | of the timeout. We have interrupts disabled while |
1907 | waiting for the ACK, so if this is set too high |
1908 | interrupts *may* be lost! |
1909 | |
1910 | omap_mux= [OMAP] Override bootloader pin multiplexing. |
1911 | Format: <mux_mode0.mode_name=value>... |
1912 | For example, to override I2C bus2: |
1913 | omap_mux=i2c2_scl.i2c2_scl=0x100,i2c2_sda.i2c2_sda=0x100 |
1914 | |
1915 | oprofile.timer= [HW] |
1916 | Use timer interrupt instead of performance counters |
1917 | |
1918 | oprofile.cpu_type= Force an oprofile cpu type |
1919 | This might be useful if you have an older oprofile |
1920 | userland or if you want common events. |
1921 | Format: { arch_perfmon } |
1922 | arch_perfmon: [X86] Force use of architectural |
1923 | perfmon on Intel CPUs instead of the |
1924 | CPU specific event set. |
1925 | timer: [X86] Force use of architectural NMI |
1926 | timer mode (see also oprofile.timer |
1927 | for generic hr timer mode) |
1928 | [s390] Force legacy basic mode sampling |
1929 | (report cpu_type "timer") |
1930 | |
1931 | oops=panic Always panic on oopses. Default is to just kill the |
1932 | process, but there is a small probability of |
1933 | deadlocking the machine. |
1934 | This will also cause panics on machine check exceptions. |
1935 | Useful together with panic=30 to trigger a reboot. |
1936 | |
1937 | OSS [HW,OSS] |
1938 | See Documentation/sound/oss/oss-parameters.txt |
1939 | |
1940 | panic= [KNL] Kernel behaviour on panic: delay <timeout> |
1941 | timeout > 0: seconds before rebooting |
1942 | timeout = 0: wait forever |
1943 | timeout < 0: reboot immediately |
1944 | Format: <timeout> |
1945 | |
1946 | parkbd.port= [HW] Parallel port number the keyboard adapter is |
1947 | connected to, default is 0. |
1948 | Format: <parport#> |
1949 | parkbd.mode= [HW] Parallel port keyboard adapter mode of operation, |
1950 | 0 for XT, 1 for AT (default is AT). |
1951 | Format: <mode> |
1952 | |
1953 | parport= [HW,PPT] Specify parallel ports. 0 disables. |
1954 | Format: { 0 | auto | 0xBBB[,IRQ[,DMA]] } |
1955 | Use 'auto' to force the driver to use any |
1956 | IRQ/DMA settings detected (the default is to |
1957 | ignore detected IRQ/DMA settings because of |
1958 | possible conflicts). You can specify the base |
1959 | address, IRQ, and DMA settings; IRQ and DMA |
1960 | should be numbers, or 'auto' (for using detected |
1961 | settings on that particular port), or 'nofifo' |
1962 | (to avoid using a FIFO even if it is detected). |
1963 | Parallel ports are assigned in the order they |
1964 | are specified on the command line, starting |
1965 | with parport0. |
1966 | |
1967 | parport_init_mode= [HW,PPT] |
1968 | Configure VIA parallel port to operate in |
1969 | a specific mode. This is necessary on Pegasos |
1970 | computer where firmware has no options for setting |
1971 | up parallel port mode and sets it to spp. |
1972 | Currently this function knows 686a and 8231 chips. |
1973 | Format: [spp|ps2|epp|ecp|ecpepp] |
1974 | |
1975 | pause_on_oops= |
1976 | Halt all CPUs after the first oops has been printed for |
1977 | the specified number of seconds. This is to be used if |
1978 | your oopses keep scrolling off the screen. |
1979 | |
1980 | pcbit= [HW,ISDN] |
1981 | |
1982 | pcd. [PARIDE] |
1983 | See header of drivers/block/paride/pcd.c. |
1984 | See also Documentation/blockdev/paride.txt. |
1985 | |
1986 | pci=option[,option...] [PCI] various PCI subsystem options: |
1987 | earlydump [X86] dump PCI config space before the kernel |
1988 | changes anything |
1989 | off [X86] don't probe for the PCI bus |
1990 | bios [X86-32] force use of PCI BIOS, don't access |
1991 | the hardware directly. Use this if your machine |
1992 | has a non-standard PCI host bridge. |
1993 | nobios [X86-32] disallow use of PCI BIOS, only direct |
1994 | hardware access methods are allowed. Use this |
1995 | if you experience crashes upon bootup and you |
1996 | suspect they are caused by the BIOS. |
1997 | conf1 [X86] Force use of PCI Configuration |
1998 | Mechanism 1. |
1999 | conf2 [X86] Force use of PCI Configuration |
2000 | Mechanism 2. |
2001 | noaer [PCIE] If the PCIEAER kernel config parameter is |
2002 | enabled, this kernel boot option can be used to |
2003 | disable the use of PCIE advanced error reporting. |
2004 | nodomains [PCI] Disable support for multiple PCI |
2005 | root domains (aka PCI segments, in ACPI-speak). |
2006 | nommconf [X86] Disable use of MMCONFIG for PCI |
2007 | Configuration |
2008 | check_enable_amd_mmconf [X86] check for and enable |
2009 | properly configured MMIO access to PCI |
2010 | config space on AMD family 10h CPU |
2011 | nomsi [MSI] If the PCI_MSI kernel config parameter is |
2012 | enabled, this kernel boot option can be used to |
2013 | disable the use of MSI interrupts system-wide. |
2014 | noioapicquirk [APIC] Disable all boot interrupt quirks. |
2015 | Safety option to keep boot IRQs enabled. This |
2016 | should never be necessary. |
2017 | ioapicreroute [APIC] Enable rerouting of boot IRQs to the |
2018 | primary IO-APIC for bridges that cannot disable |
2019 | boot IRQs. This fixes a source of spurious IRQs |
2020 | when the system masks IRQs. |
2021 | noioapicreroute [APIC] Disable workaround that uses the |
2022 | boot IRQ equivalent of an IRQ that connects to |
2023 | a chipset where boot IRQs cannot be disabled. |
2024 | The opposite of ioapicreroute. |
2025 | biosirq [X86-32] Use PCI BIOS calls to get the interrupt |
2026 | routing table. These calls are known to be buggy |
2027 | on several machines and they hang the machine |
2028 | when used, but on other computers it's the only |
2029 | way to get the interrupt routing table. Try |
2030 | this option if the kernel is unable to allocate |
2031 | IRQs or discover secondary PCI buses on your |
2032 | motherboard. |
2033 | rom [X86] Assign address space to expansion ROMs. |
2034 | Use with caution as certain devices share |
2035 | address decoders between ROMs and other |
2036 | resources. |
2037 | norom [X86] Do not assign address space to |
2038 | expansion ROMs that do not already have |
2039 | BIOS assigned address ranges. |
2040 | nobar [X86] Do not assign address space to the |
2041 | BARs that weren't assigned by the BIOS. |
2042 | irqmask=0xMMMM [X86] Set a bit mask of IRQs allowed to be |
2043 | assigned automatically to PCI devices. You can |
2044 | make the kernel exclude IRQs of your ISA cards |
2045 | this way. |
2046 | pirqaddr=0xAAAAA [X86] Specify the physical address |
2047 | of the PIRQ table (normally generated |
2048 | by the BIOS) if it is outside the |
2049 | F0000h-100000h range. |
2050 | lastbus=N [X86] Scan all buses thru bus #N. Can be |
2051 | useful if the kernel is unable to find your |
2052 | secondary buses and you want to tell it |
2053 | explicitly which ones they are. |
2054 | assign-busses [X86] Always assign all PCI bus |
2055 | numbers ourselves, overriding |
2056 | whatever the firmware may have done. |
2057 | usepirqmask [X86] Honor the possible IRQ mask stored |
2058 | in the BIOS $PIR table. This is needed on |
2059 | some systems with broken BIOSes, notably |
2060 | some HP Pavilion N5400 and Omnibook XE3 |
2061 | notebooks. This will have no effect if ACPI |
2062 | IRQ routing is enabled. |
2063 | noacpi [X86] Do not use ACPI for IRQ routing |
2064 | or for PCI scanning. |
2065 | use_crs [X86] Use PCI host bridge window information |
2066 | from ACPI. On BIOSes from 2008 or later, this |
2067 | is enabled by default. If you need to use this, |
2068 | please report a bug. |
2069 | nocrs [X86] Ignore PCI host bridge windows from ACPI. |
2070 | If you need to use this, please report a bug. |
2071 | routeirq Do IRQ routing for all PCI devices. |
2072 | This is normally done in pci_enable_device(), |
2073 | so this option is a temporary workaround |
2074 | for broken drivers that don't call it. |
2075 | skip_isa_align [X86] do not align io start addr, so can |
2076 | handle more pci cards |
2077 | firmware [ARM] Do not re-enumerate the bus but instead |
2078 | just use the configuration from the |
2079 | bootloader. This is currently used on |
2080 | IXP2000 systems where the bus has to be |
2081 | configured a certain way for adjunct CPUs. |
2082 | noearly [X86] Don't do any early type 1 scanning. |
2083 | This might help on some broken boards which |
2084 | machine check when some devices' config space |
2085 | is read. But various workarounds are disabled |
2086 | and some IOMMU drivers will not work. |
2087 | bfsort Sort PCI devices into breadth-first order. |
2088 | This sorting is done to get a device |
2089 | order compatible with older (<= 2.4) kernels. |
2090 | nobfsort Don't sort PCI devices into breadth-first order. |
2091 | cbiosize=nn[KMG] The fixed amount of bus space which is |
2092 | reserved for the CardBus bridge's IO window. |
2093 | The default value is 256 bytes. |
2094 | cbmemsize=nn[KMG] The fixed amount of bus space which is |
2095 | reserved for the CardBus bridge's memory |
2096 | window. The default value is 64 megabytes. |
2097 | resource_alignment= |
2098 | Format: |
2099 | [<order of align>@][<domain>:]<bus>:<slot>.<func>[; ...] |
2100 | Specifies alignment and device to reassign |
2101 | aligned memory resources. |
2102 | If <order of align> is not specified, |
2103 | PAGE_SIZE is used as alignment. |
2104 | PCI-PCI bridge can be specified, if resource |
2105 | windows need to be expanded. |
2106 | ecrc= Enable/disable PCIe ECRC (transaction layer |
2107 | end-to-end CRC checking). |
2108 | bios: Use BIOS/firmware settings. This is the |
2109 | the default. |
2110 | off: Turn ECRC off |
2111 | on: Turn ECRC on. |
2112 | realloc reallocate PCI resources if allocations done by BIOS |
2113 | are erroneous. |
2114 | |
2115 | pcie_aspm= [PCIE] Forcibly enable or disable PCIe Active State Power |
2116 | Management. |
2117 | off Disable ASPM. |
2118 | force Enable ASPM even on devices that claim not to support it. |
2119 | WARNING: Forcing ASPM on may cause system lockups. |
2120 | |
2121 | pcie_ports= [PCIE] PCIe ports handling: |
2122 | auto Ask the BIOS whether or not to use native PCIe services |
2123 | associated with PCIe ports (PME, hot-plug, AER). Use |
2124 | them only if that is allowed by the BIOS. |
2125 | native Use native PCIe services associated with PCIe ports |
2126 | unconditionally. |
2127 | compat Treat PCIe ports as PCI-to-PCI bridges, disable the PCIe |
2128 | ports driver. |
2129 | |
2130 | pcie_pme= [PCIE,PM] Native PCIe PME signaling options: |
2131 | nomsi Do not use MSI for native PCIe PME signaling (this makes |
2132 | all PCIe root ports use INTx for all services). |
2133 | |
2134 | pcmv= [HW,PCMCIA] BadgePAD 4 |
2135 | |
2136 | pd. [PARIDE] |
2137 | See Documentation/blockdev/paride.txt. |
2138 | |
2139 | pdcchassis= [PARISC,HW] Disable/Enable PDC Chassis Status codes at |
2140 | boot time. |
2141 | Format: { 0 | 1 } |
2142 | See arch/parisc/kernel/pdc_chassis.c |
2143 | |
2144 | percpu_alloc= Select which percpu first chunk allocator to use. |
2145 | Currently supported values are "embed" and "page". |
2146 | Archs may support subset or none of the selections. |
2147 | See comments in mm/percpu.c for details on each |
2148 | allocator. This parameter is primarily for debugging |
2149 | and performance comparison. |
2150 | |
2151 | pf. [PARIDE] |
2152 | See Documentation/blockdev/paride.txt. |
2153 | |
2154 | pg. [PARIDE] |
2155 | See Documentation/blockdev/paride.txt. |
2156 | |
2157 | pirq= [SMP,APIC] Manual mp-table setup |
2158 | See Documentation/x86/i386/IO-APIC.txt. |
2159 | |
2160 | plip= [PPT,NET] Parallel port network link |
2161 | Format: { parport<nr> | timid | 0 } |
2162 | See also Documentation/parport.txt. |
2163 | |
2164 | pmtmr= [X86] Manual setup of pmtmr I/O Port. |
2165 | Override pmtimer IOPort with a hex value. |
2166 | e.g. pmtmr=0x508 |
2167 | |
2168 | pnp.debug=1 [PNP] |
2169 | Enable PNP debug messages (depends on the |
2170 | CONFIG_PNP_DEBUG_MESSAGES option). Change at run-time |
2171 | via /sys/module/pnp/parameters/debug. We always show |
2172 | current resource usage; turning this on also shows |
2173 | possible settings and some assignment information. |
2174 | |
2175 | pnpacpi= [ACPI] |
2176 | { off } |
2177 | |
2178 | pnpbios= [ISAPNP] |
2179 | { on | off | curr | res | no-curr | no-res } |
2180 | |
2181 | pnp_reserve_irq= |
2182 | [ISAPNP] Exclude IRQs for the autoconfiguration |
2183 | |
2184 | pnp_reserve_dma= |
2185 | [ISAPNP] Exclude DMAs for the autoconfiguration |
2186 | |
2187 | pnp_reserve_io= [ISAPNP] Exclude I/O ports for the autoconfiguration |
2188 | Ranges are in pairs (I/O port base and size). |
2189 | |
2190 | pnp_reserve_mem= |
2191 | [ISAPNP] Exclude memory regions for the |
2192 | autoconfiguration. |
2193 | Ranges are in pairs (memory base and size). |
2194 | |
2195 | ports= [IP_VS_FTP] IPVS ftp helper module |
2196 | Default is 21. |
2197 | Up to 8 (IP_VS_APP_MAX_PORTS) ports |
2198 | may be specified. |
2199 | Format: <port>,<port>.... |
2200 | |
2201 | print-fatal-signals= |
2202 | [KNL] debug: print fatal signals |
2203 | |
2204 | If enabled, warn about various signal handling |
2205 | related application anomalies: too many signals, |
2206 | too many POSIX.1 timers, fatal signals causing a |
2207 | coredump - etc. |
2208 | |
2209 | If you hit the warning due to signal overflow, |
2210 | you might want to try "ulimit -i unlimited". |
2211 | |
2212 | default: off. |
2213 | |
2214 | printk.always_kmsg_dump= |
2215 | Trigger kmsg_dump for cases other than kernel oops or |
2216 | panics |
2217 | Format: <bool> (1/Y/y=enable, 0/N/n=disable) |
2218 | default: disabled |
2219 | |
2220 | printk.time= Show timing data prefixed to each printk message line |
2221 | Format: <bool> (1/Y/y=enable, 0/N/n=disable) |
2222 | |
2223 | processor.max_cstate= [HW,ACPI] |
2224 | Limit processor to maximum C-state |
2225 | max_cstate=9 overrides any DMI blacklist limit. |
2226 | |
2227 | processor.nocst [HW,ACPI] |
2228 | Ignore the _CST method to determine C-states, |
2229 | instead using the legacy FADT method |
2230 | |
2231 | profile= [KNL] Enable kernel profiling via /proc/profile |
2232 | Format: [schedule,]<number> |
2233 | Param: "schedule" - profile schedule points. |
2234 | Param: <number> - step/bucket size as a power of 2 for |
2235 | statistical time based profiling. |
2236 | Param: "sleep" - profile D-state sleeping (millisecs). |
2237 | Requires CONFIG_SCHEDSTATS |
2238 | Param: "kvm" - profile VM exits. |
2239 | |
2240 | prompt_ramdisk= [RAM] List of RAM disks to prompt for floppy disk |
2241 | before loading. |
2242 | See Documentation/blockdev/ramdisk.txt. |
2243 | |
2244 | psmouse.proto= [HW,MOUSE] Highest PS2 mouse protocol extension to |
2245 | probe for; one of (bare|imps|exps|lifebook|any). |
2246 | psmouse.rate= [HW,MOUSE] Set desired mouse report rate, in reports |
2247 | per second. |
2248 | psmouse.resetafter= [HW,MOUSE] |
2249 | Try to reset the device after so many bad packets |
2250 | (0 = never). |
2251 | psmouse.resolution= |
2252 | [HW,MOUSE] Set desired mouse resolution, in dpi. |
2253 | psmouse.smartscroll= |
2254 | [HW,MOUSE] Controls Logitech smartscroll autorepeat. |
2255 | 0 = disabled, 1 = enabled (default). |
2256 | |
2257 | pstore.backend= Specify the name of the pstore backend to use |
2258 | |
2259 | pt. [PARIDE] |
2260 | See Documentation/blockdev/paride.txt. |
2261 | |
2262 | pty.legacy_count= |
2263 | [KNL] Number of legacy pty's. Overwrites compiled-in |
2264 | default number. |
2265 | |
2266 | quiet [KNL] Disable most log messages |
2267 | |
2268 | r128= [HW,DRM] |
2269 | |
2270 | raid= [HW,RAID] |
2271 | See Documentation/md.txt. |
2272 | |
2273 | ramdisk_blocksize= [RAM] |
2274 | See Documentation/blockdev/ramdisk.txt. |
2275 | |
2276 | ramdisk_size= [RAM] Sizes of RAM disks in kilobytes |
2277 | See Documentation/blockdev/ramdisk.txt. |
2278 | |
2279 | rcupdate.blimit= [KNL,BOOT] |
2280 | Set maximum number of finished RCU callbacks to process |
2281 | in one batch. |
2282 | |
2283 | rcupdate.qhimark= [KNL,BOOT] |
2284 | Set threshold of queued |
2285 | RCU callbacks over which batch limiting is disabled. |
2286 | |
2287 | rcupdate.qlowmark= [KNL,BOOT] |
2288 | Set threshold of queued RCU callbacks below which |
2289 | batch limiting is re-enabled. |
2290 | |
2291 | rdinit= [KNL] |
2292 | Format: <full_path> |
2293 | Run specified binary instead of /init from the ramdisk, |
2294 | used for early userspace startup. See initrd. |
2295 | |
2296 | reboot= [BUGS=X86-32,BUGS=ARM,BUGS=IA-64] Rebooting mode |
2297 | Format: <reboot_mode>[,<reboot_mode2>[,...]] |
2298 | See arch/*/kernel/reboot.c or arch/*/kernel/process.c |
2299 | |
2300 | relax_domain_level= |
2301 | [KNL, SMP] Set scheduler's default relax_domain_level. |
2302 | See Documentation/cgroups/cpusets.txt. |
2303 | |
2304 | reserve= [KNL,BUGS] Force the kernel to ignore some iomem area |
2305 | |
2306 | reservetop= [X86-32] |
2307 | Format: nn[KMG] |
2308 | Reserves a hole at the top of the kernel virtual |
2309 | address space. |
2310 | |
2311 | reservelow= [X86] |
2312 | Format: nn[K] |
2313 | Set the amount of memory to reserve for BIOS at |
2314 | the bottom of the address space. |
2315 | |
2316 | reset_devices [KNL] Force drivers to reset the underlying device |
2317 | during initialization. |
2318 | |
2319 | resume= [SWSUSP] |
2320 | Specify the partition device for software suspend |
2321 | |
2322 | resume_offset= [SWSUSP] |
2323 | Specify the offset from the beginning of the partition |
2324 | given by "resume=" at which the swap header is located, |
2325 | in <PAGE_SIZE> units (needed only for swap files). |
2326 | See Documentation/power/swsusp-and-swap-files.txt |
2327 | |
2328 | resumedelay= [HIBERNATION] Delay (in seconds) to pause before attempting to |
2329 | read the resume files |
2330 | |
2331 | resumewait [HIBERNATION] Wait (indefinitely) for resume device to show up. |
2332 | Useful for devices that are detected asynchronously |
2333 | (e.g. USB and MMC devices). |
2334 | |
2335 | hibernate= [HIBERNATION] |
2336 | noresume Don't check if there's a hibernation image |
2337 | present during boot. |
2338 | nocompress Don't compress/decompress hibernation images. |
2339 | |
2340 | retain_initrd [RAM] Keep initrd memory after extraction |
2341 | |
2342 | rhash_entries= [KNL,NET] |
2343 | Set number of hash buckets for route cache |
2344 | |
2345 | riscom8= [HW,SERIAL] |
2346 | Format: <io_board1>[,<io_board2>[,...<io_boardN>]] |
2347 | |
2348 | ro [KNL] Mount root device read-only on boot |
2349 | |
2350 | root= [KNL] Root filesystem |
2351 | See name_to_dev_t comment in init/do_mounts.c. |
2352 | |
2353 | rootdelay= [KNL] Delay (in seconds) to pause before attempting to |
2354 | mount the root filesystem |
2355 | |
2356 | rootflags= [KNL] Set root filesystem mount option string |
2357 | |
2358 | rootfstype= [KNL] Set root filesystem type |
2359 | |
2360 | rootwait [KNL] Wait (indefinitely) for root device to show up. |
2361 | Useful for devices that are detected asynchronously |
2362 | (e.g. USB and MMC devices). |
2363 | |
2364 | rw [KNL] Mount root device read-write on boot |
2365 | |
2366 | S [KNL] Run init in single mode |
2367 | |
2368 | sa1100ir [NET] |
2369 | See drivers/net/irda/sa1100_ir.c. |
2370 | |
2371 | sbni= [NET] Granch SBNI12 leased line adapter |
2372 | |
2373 | sched_debug [KNL] Enables verbose scheduler debug messages. |
2374 | |
2375 | security= [SECURITY] Choose a security module to enable at boot. |
2376 | If this boot parameter is not specified, only the first |
2377 | security module asking for security registration will be |
2378 | loaded. An invalid security module name will be treated |
2379 | as if no module has been chosen. |
2380 | |
2381 | selinux= [SELINUX] Disable or enable SELinux at boot time. |
2382 | Format: { "0" | "1" } |
2383 | See security/selinux/Kconfig help text. |
2384 | 0 -- disable. |
2385 | 1 -- enable. |
2386 | Default value is set via kernel config option. |
2387 | If enabled at boot time, /selinux/disable can be used |
2388 | later to disable prior to initial policy load. |
2389 | |
2390 | apparmor= [APPARMOR] Disable or enable AppArmor at boot time |
2391 | Format: { "0" | "1" } |
2392 | See security/apparmor/Kconfig help text |
2393 | 0 -- disable. |
2394 | 1 -- enable. |
2395 | Default value is set via kernel config option. |
2396 | |
2397 | serialnumber [BUGS=X86-32] |
2398 | |
2399 | shapers= [NET] |
2400 | Maximal number of shapers. |
2401 | |
2402 | show_msr= [x86] show boot-time MSR settings |
2403 | Format: { <integer> } |
2404 | Show boot-time (BIOS-initialized) MSR settings. |
2405 | The parameter means the number of CPUs to show, |
2406 | for example 1 means boot CPU only. |
2407 | |
2408 | simeth= [IA-64] |
2409 | simscsi= |
2410 | |
2411 | slram= [HW,MTD] |
2412 | |
2413 | slab_max_order= [MM, SLAB] |
2414 | Determines the maximum allowed order for slabs. |
2415 | A high setting may cause OOMs due to memory |
2416 | fragmentation. Defaults to 1 for systems with |
2417 | more than 32MB of RAM, 0 otherwise. |
2418 | |
2419 | slub_debug[=options[,slabs]] [MM, SLUB] |
2420 | Enabling slub_debug allows one to determine the |
2421 | culprit if slab objects become corrupted. Enabling |
2422 | slub_debug can create guard zones around objects and |
2423 | may poison objects when not in use. Also tracks the |
2424 | last alloc / free. For more information see |
2425 | Documentation/vm/slub.txt. |
2426 | |
2427 | slub_max_order= [MM, SLUB] |
2428 | Determines the maximum allowed order for slabs. |
2429 | A high setting may cause OOMs due to memory |
2430 | fragmentation. For more information see |
2431 | Documentation/vm/slub.txt. |
2432 | |
2433 | slub_min_objects= [MM, SLUB] |
2434 | The minimum number of objects per slab. SLUB will |
2435 | increase the slab order up to slub_max_order to |
2436 | generate a sufficiently large slab able to contain |
2437 | the number of objects indicated. The higher the number |
2438 | of objects the smaller the overhead of tracking slabs |
2439 | and the less frequently locks need to be acquired. |
2440 | For more information see Documentation/vm/slub.txt. |
2441 | |
2442 | slub_min_order= [MM, SLUB] |
2443 | Determines the mininum page order for slabs. Must be |
2444 | lower than slub_max_order. |
2445 | For more information see Documentation/vm/slub.txt. |
2446 | |
2447 | slub_nomerge [MM, SLUB] |
2448 | Disable merging of slabs with similar size. May be |
2449 | necessary if there is some reason to distinguish |
2450 | allocs to different slabs. Debug options disable |
2451 | merging on their own. |
2452 | For more information see Documentation/vm/slub.txt. |
2453 | |
2454 | smart2= [HW] |
2455 | Format: <io1>[,<io2>[,...,<io8>]] |
2456 | |
2457 | smp-alt-once [X86-32,SMP] On a hotplug CPU system, only |
2458 | attempt to substitute SMP alternatives once at boot. |
2459 | |
2460 | smsc-ircc2.nopnp [HW] Don't use PNP to discover SMC devices |
2461 | smsc-ircc2.ircc_cfg= [HW] Device configuration I/O port |
2462 | smsc-ircc2.ircc_sir= [HW] SIR base I/O port |
2463 | smsc-ircc2.ircc_fir= [HW] FIR base I/O port |
2464 | smsc-ircc2.ircc_irq= [HW] IRQ line |
2465 | smsc-ircc2.ircc_dma= [HW] DMA channel |
2466 | smsc-ircc2.ircc_transceiver= [HW] Transceiver type: |
2467 | 0: Toshiba Satellite 1800 (GP data pin select) |
2468 | 1: Fast pin select (default) |
2469 | 2: ATC IRMode |
2470 | |
2471 | softlockup_panic= |
2472 | [KNL] Should the soft-lockup detector generate panics. |
2473 | Format: <integer> |
2474 | |
2475 | sonypi.*= [HW] Sony Programmable I/O Control Device driver |
2476 | See Documentation/laptops/sonypi.txt |
2477 | |
2478 | specialix= [HW,SERIAL] Specialix multi-serial port adapter |
2479 | See Documentation/serial/specialix.txt. |
2480 | |
2481 | spia_io_base= [HW,MTD] |
2482 | spia_fio_base= |
2483 | spia_pedr= |
2484 | spia_peddr= |
2485 | |
2486 | stacktrace [FTRACE] |
2487 | Enabled the stack tracer on boot up. |
2488 | |
2489 | stacktrace_filter=[function-list] |
2490 | [FTRACE] Limit the functions that the stack tracer |
2491 | will trace at boot up. function-list is a comma separated |
2492 | list of functions. This list can be changed at run |
2493 | time by the stack_trace_filter file in the debugfs |
2494 | tracing directory. Note, this enables stack tracing |
2495 | and the stacktrace above is not needed. |
2496 | |
2497 | sti= [PARISC,HW] |
2498 | Format: <num> |
2499 | Set the STI (builtin display/keyboard on the HP-PARISC |
2500 | machines) console (graphic card) which should be used |
2501 | as the initial boot-console. |
2502 | See also comment in drivers/video/console/sticore.c. |
2503 | |
2504 | sti_font= [HW] |
2505 | See comment in drivers/video/console/sticore.c. |
2506 | |
2507 | stifb= [HW] |
2508 | Format: bpp:<bpp1>[:<bpp2>[:<bpp3>...]] |
2509 | |
2510 | sunrpc.min_resvport= |
2511 | sunrpc.max_resvport= |
2512 | [NFS,SUNRPC] |
2513 | SunRPC servers often require that client requests |
2514 | originate from a privileged port (i.e. a port in the |
2515 | range 0 < portnr < 1024). |
2516 | An administrator who wishes to reserve some of these |
2517 | ports for other uses may adjust the range that the |
2518 | kernel's sunrpc client considers to be privileged |
2519 | using these two parameters to set the minimum and |
2520 | maximum port values. |
2521 | |
2522 | sunrpc.pool_mode= |
2523 | [NFS] |
2524 | Control how the NFS server code allocates CPUs to |
2525 | service thread pools. Depending on how many NICs |
2526 | you have and where their interrupts are bound, this |
2527 | option will affect which CPUs will do NFS serving. |
2528 | Note: this parameter cannot be changed while the |
2529 | NFS server is running. |
2530 | |
2531 | auto the server chooses an appropriate mode |
2532 | automatically using heuristics |
2533 | global a single global pool contains all CPUs |
2534 | percpu one pool for each CPU |
2535 | pernode one pool for each NUMA node (equivalent |
2536 | to global on non-NUMA machines) |
2537 | |
2538 | sunrpc.tcp_slot_table_entries= |
2539 | sunrpc.udp_slot_table_entries= |
2540 | [NFS,SUNRPC] |
2541 | Sets the upper limit on the number of simultaneous |
2542 | RPC calls that can be sent from the client to a |
2543 | server. Increasing these values may allow you to |
2544 | improve throughput, but will also increase the |
2545 | amount of memory reserved for use by the client. |
2546 | |
2547 | swapaccount[=0|1] |
2548 | [KNL] Enable accounting of swap in memory resource |
2549 | controller if no parameter or 1 is given or disable |
2550 | it if 0 is given (See Documentation/cgroups/memory.txt) |
2551 | |
2552 | swiotlb= [IA-64] Number of I/O TLB slabs |
2553 | |
2554 | switches= [HW,M68k] |
2555 | |
2556 | sysfs.deprecated=0|1 [KNL] |
2557 | Enable/disable old style sysfs layout for old udev |
2558 | on older distributions. When this option is enabled |
2559 | very new udev will not work anymore. When this option |
2560 | is disabled (or CONFIG_SYSFS_DEPRECATED not compiled) |
2561 | in older udev will not work anymore. |
2562 | Default depends on CONFIG_SYSFS_DEPRECATED_V2 set in |
2563 | the kernel configuration. |
2564 | |
2565 | sysrq_always_enabled |
2566 | [KNL] |
2567 | Ignore sysrq setting - this boot parameter will |
2568 | neutralize any effect of /proc/sys/kernel/sysrq. |
2569 | Useful for debugging. |
2570 | |
2571 | tdfx= [HW,DRM] |
2572 | |
2573 | test_suspend= [SUSPEND] |
2574 | Specify "mem" (for Suspend-to-RAM) or "standby" (for |
2575 | standby suspend) as the system sleep state to briefly |
2576 | enter during system startup. The system is woken from |
2577 | this state using a wakeup-capable RTC alarm. |
2578 | |
2579 | thash_entries= [KNL,NET] |
2580 | Set number of hash buckets for TCP connection |
2581 | |
2582 | thermal.act= [HW,ACPI] |
2583 | -1: disable all active trip points in all thermal zones |
2584 | <degrees C>: override all lowest active trip points |
2585 | |
2586 | thermal.crt= [HW,ACPI] |
2587 | -1: disable all critical trip points in all thermal zones |
2588 | <degrees C>: override all critical trip points |
2589 | |
2590 | thermal.nocrt= [HW,ACPI] |
2591 | Set to disable actions on ACPI thermal zone |
2592 | critical and hot trip points. |
2593 | |
2594 | thermal.off= [HW,ACPI] |
2595 | 1: disable ACPI thermal control |
2596 | |
2597 | thermal.psv= [HW,ACPI] |
2598 | -1: disable all passive trip points |
2599 | <degrees C>: override all passive trip points to this |
2600 | value |
2601 | |
2602 | thermal.tzp= [HW,ACPI] |
2603 | Specify global default ACPI thermal zone polling rate |
2604 | <deci-seconds>: poll all this frequency |
2605 | 0: no polling (default) |
2606 | |
2607 | threadirqs [KNL] |
2608 | Force threading of all interrupt handlers except those |
2609 | marked explicitely IRQF_NO_THREAD. |
2610 | |
2611 | topology= [S390] |
2612 | Format: {off | on} |
2613 | Specify if the kernel should make use of the cpu |
2614 | topology information if the hardware supports this. |
2615 | The scheduler will make use of this information and |
2616 | e.g. base its process migration decisions on it. |
2617 | Default is on. |
2618 | |
2619 | tp720= [HW,PS2] |
2620 | |
2621 | tpm_suspend_pcr=[HW,TPM] |
2622 | Format: integer pcr id |
2623 | Specify that at suspend time, the tpm driver |
2624 | should extend the specified pcr with zeros, |
2625 | as a workaround for some chips which fail to |
2626 | flush the last written pcr on TPM_SaveState. |
2627 | This will guarantee that all the other pcrs |
2628 | are saved. |
2629 | |
2630 | trace_buf_size=nn[KMG] |
2631 | [FTRACE] will set tracing buffer size. |
2632 | |
2633 | trace_event=[event-list] |
2634 | [FTRACE] Set and start specified trace events in order |
2635 | to facilitate early boot debugging. |
2636 | See also Documentation/trace/events.txt |
2637 | |
2638 | tsc= Disable clocksource stability checks for TSC. |
2639 | Format: <string> |
2640 | [x86] reliable: mark tsc clocksource as reliable, this |
2641 | disables clocksource verification at runtime, as well |
2642 | as the stability checks done at bootup. Used to enable |
2643 | high-resolution timer mode on older hardware, and in |
2644 | virtualized environment. |
2645 | [x86] noirqtime: Do not use TSC to do irq accounting. |
2646 | Used to run time disable IRQ_TIME_ACCOUNTING on any |
2647 | platforms where RDTSC is slow and this accounting |
2648 | can add overhead. |
2649 | |
2650 | turbografx.map[2|3]= [HW,JOY] |
2651 | TurboGraFX parallel port interface |
2652 | Format: |
2653 | <port#>,<js1>,<js2>,<js3>,<js4>,<js5>,<js6>,<js7> |
2654 | See also Documentation/input/joystick-parport.txt |
2655 | |
2656 | udbg-immortal [PPC] When debugging early kernel crashes that |
2657 | happen after console_init() and before a proper |
2658 | console driver takes over, this boot options might |
2659 | help "seeing" what's going on. |
2660 | |
2661 | uhash_entries= [KNL,NET] |
2662 | Set number of hash buckets for UDP/UDP-Lite connections |
2663 | |
2664 | uhci-hcd.ignore_oc= |
2665 | [USB] Ignore overcurrent events (default N). |
2666 | Some badly-designed motherboards generate lots of |
2667 | bogus events, for ports that aren't wired to |
2668 | anything. Set this parameter to avoid log spamming. |
2669 | Note that genuine overcurrent events won't be |
2670 | reported either. |
2671 | |
2672 | unknown_nmi_panic |
2673 | [X86] Cause panic on unknown NMI. |
2674 | |
2675 | usbcore.authorized_default= |
2676 | [USB] Default USB device authorization: |
2677 | (default -1 = authorized except for wireless USB, |
2678 | 0 = not authorized, 1 = authorized) |
2679 | |
2680 | usbcore.autosuspend= |
2681 | [USB] The autosuspend time delay (in seconds) used |
2682 | for newly-detected USB devices (default 2). This |
2683 | is the time required before an idle device will be |
2684 | autosuspended. Devices for which the delay is set |
2685 | to a negative value won't be autosuspended at all. |
2686 | |
2687 | usbcore.usbfs_snoop= |
2688 | [USB] Set to log all usbfs traffic (default 0 = off). |
2689 | |
2690 | usbcore.blinkenlights= |
2691 | [USB] Set to cycle leds on hubs (default 0 = off). |
2692 | |
2693 | usbcore.old_scheme_first= |
2694 | [USB] Start with the old device initialization |
2695 | scheme (default 0 = off). |
2696 | |
2697 | usbcore.usbfs_memory_mb= |
2698 | [USB] Memory limit (in MB) for buffers allocated by |
2699 | usbfs (default = 16, 0 = max = 2047). |
2700 | |
2701 | usbcore.use_both_schemes= |
2702 | [USB] Try the other device initialization scheme |
2703 | if the first one fails (default 1 = enabled). |
2704 | |
2705 | usbcore.initial_descriptor_timeout= |
2706 | [USB] Specifies timeout for the initial 64-byte |
2707 | USB_REQ_GET_DESCRIPTOR request in milliseconds |
2708 | (default 5000 = 5.0 seconds). |
2709 | |
2710 | usbhid.mousepoll= |
2711 | [USBHID] The interval which mice are to be polled at. |
2712 | |
2713 | usb-storage.delay_use= |
2714 | [UMS] The delay in seconds before a new device is |
2715 | scanned for Logical Units (default 5). |
2716 | |
2717 | usb-storage.quirks= |
2718 | [UMS] A list of quirks entries to supplement or |
2719 | override the built-in unusual_devs list. List |
2720 | entries are separated by commas. Each entry has |
2721 | the form VID:PID:Flags where VID and PID are Vendor |
2722 | and Product ID values (4-digit hex numbers) and |
2723 | Flags is a set of characters, each corresponding |
2724 | to a common usb-storage quirk flag as follows: |
2725 | a = SANE_SENSE (collect more than 18 bytes |
2726 | of sense data); |
2727 | b = BAD_SENSE (don't collect more than 18 |
2728 | bytes of sense data); |
2729 | c = FIX_CAPACITY (decrease the reported |
2730 | device capacity by one sector); |
2731 | d = NO_READ_DISC_INFO (don't use |
2732 | READ_DISC_INFO command); |
2733 | e = NO_READ_CAPACITY_16 (don't use |
2734 | READ_CAPACITY_16 command); |
2735 | h = CAPACITY_HEURISTICS (decrease the |
2736 | reported device capacity by one |
2737 | sector if the number is odd); |
2738 | i = IGNORE_DEVICE (don't bind to this |
2739 | device); |
2740 | l = NOT_LOCKABLE (don't try to lock and |
2741 | unlock ejectable media); |
2742 | m = MAX_SECTORS_64 (don't transfer more |
2743 | than 64 sectors = 32 KB at a time); |
2744 | n = INITIAL_READ10 (force a retry of the |
2745 | initial READ(10) command); |
2746 | o = CAPACITY_OK (accept the capacity |
2747 | reported by the device); |
2748 | r = IGNORE_RESIDUE (the device reports |
2749 | bogus residue values); |
2750 | s = SINGLE_LUN (the device has only one |
2751 | Logical Unit); |
2752 | w = NO_WP_DETECT (don't test whether the |
2753 | medium is write-protected). |
2754 | Example: quirks=0419:aaf5:rl,0421:0433:rc |
2755 | |
2756 | user_debug= [KNL,ARM] |
2757 | Format: <int> |
2758 | See arch/arm/Kconfig.debug help text. |
2759 | 1 - undefined instruction events |
2760 | 2 - system calls |
2761 | 4 - invalid data aborts |
2762 | 8 - SIGSEGV faults |
2763 | 16 - SIGBUS faults |
2764 | Example: user_debug=31 |
2765 | |
2766 | userpte= |
2767 | [X86] Flags controlling user PTE allocations. |
2768 | |
2769 | nohigh = do not allocate PTE pages in |
2770 | HIGHMEM regardless of setting |
2771 | of CONFIG_HIGHPTE. |
2772 | |
2773 | vdso= [X86,SH] |
2774 | vdso=2: enable compat VDSO (default with COMPAT_VDSO) |
2775 | vdso=1: enable VDSO (default) |
2776 | vdso=0: disable VDSO mapping |
2777 | |
2778 | vdso32= [X86] |
2779 | vdso32=2: enable compat VDSO (default with COMPAT_VDSO) |
2780 | vdso32=1: enable 32-bit VDSO (default) |
2781 | vdso32=0: disable 32-bit VDSO mapping |
2782 | |
2783 | vector= [IA-64,SMP] |
2784 | vector=percpu: enable percpu vector domain |
2785 | |
2786 | video= [FB] Frame buffer configuration |
2787 | See Documentation/fb/modedb.txt. |
2788 | |
2789 | vga= [BOOT,X86-32] Select a particular video mode |
2790 | See Documentation/x86/boot.txt and |
2791 | Documentation/svga.txt. |
2792 | Use vga=ask for menu. |
2793 | This is actually a boot loader parameter; the value is |
2794 | passed to the kernel using a special protocol. |
2795 | |
2796 | vmalloc=nn[KMG] [KNL,BOOT] Forces the vmalloc area to have an exact |
2797 | size of <nn>. This can be used to increase the |
2798 | minimum size (128MB on x86). It can also be used to |
2799 | decrease the size and leave more room for directly |
2800 | mapped kernel RAM. |
2801 | |
2802 | vmhalt= [KNL,S390] Perform z/VM CP command after system halt. |
2803 | Format: <command> |
2804 | |
2805 | vmpanic= [KNL,S390] Perform z/VM CP command after kernel panic. |
2806 | Format: <command> |
2807 | |
2808 | vmpoff= [KNL,S390] Perform z/VM CP command after power off. |
2809 | Format: <command> |
2810 | |
2811 | vsyscall= [X86-64] |
2812 | Controls the behavior of vsyscalls (i.e. calls to |
2813 | fixed addresses of 0xffffffffff600x00 from legacy |
2814 | code). Most statically-linked binaries and older |
2815 | versions of glibc use these calls. Because these |
2816 | functions are at fixed addresses, they make nice |
2817 | targets for exploits that can control RIP. |
2818 | |
2819 | emulate [default] Vsyscalls turn into traps and are |
2820 | emulated reasonably safely. |
2821 | |
2822 | native Vsyscalls are native syscall instructions. |
2823 | This is a little bit faster than trapping |
2824 | and makes a few dynamic recompilers work |
2825 | better than they would in emulation mode. |
2826 | It also makes exploits much easier to write. |
2827 | |
2828 | none Vsyscalls don't work at all. This makes |
2829 | them quite hard to use for exploits but |
2830 | might break your system. |
2831 | |
2832 | vt.cur_default= [VT] Default cursor shape. |
2833 | Format: 0xCCBBAA, where AA, BB, and CC are the same as |
2834 | the parameters of the <Esc>[?A;B;Cc escape sequence; |
2835 | see VGA-softcursor.txt. Default: 2 = underline. |
2836 | |
2837 | vt.default_blu= [VT] |
2838 | Format: <blue0>,<blue1>,<blue2>,...,<blue15> |
2839 | Change the default blue palette of the console. |
2840 | This is a 16-member array composed of values |
2841 | ranging from 0-255. |
2842 | |
2843 | vt.default_grn= [VT] |
2844 | Format: <green0>,<green1>,<green2>,...,<green15> |
2845 | Change the default green palette of the console. |
2846 | This is a 16-member array composed of values |
2847 | ranging from 0-255. |
2848 | |
2849 | vt.default_red= [VT] |
2850 | Format: <red0>,<red1>,<red2>,...,<red15> |
2851 | Change the default red palette of the console. |
2852 | This is a 16-member array composed of values |
2853 | ranging from 0-255. |
2854 | |
2855 | vt.default_utf8= |
2856 | [VT] |
2857 | Format=<0|1> |
2858 | Set system-wide default UTF-8 mode for all tty's. |
2859 | Default is 1, i.e. UTF-8 mode is enabled for all |
2860 | newly opened terminals. |
2861 | |
2862 | vt.global_cursor_default= |
2863 | [VT] |
2864 | Format=<-1|0|1> |
2865 | Set system-wide default for whether a cursor |
2866 | is shown on new VTs. Default is -1, |
2867 | i.e. cursors will be created by default unless |
2868 | overridden by individual drivers. 0 will hide |
2869 | cursors, 1 will display them. |
2870 | |
2871 | watchdog timers [HW,WDT] For information on watchdog timers, |
2872 | see Documentation/watchdog/watchdog-parameters.txt |
2873 | or other driver-specific files in the |
2874 | Documentation/watchdog/ directory. |
2875 | |
2876 | x2apic_phys [X86-64,APIC] Use x2apic physical mode instead of |
2877 | default x2apic cluster mode on platforms |
2878 | supporting x2apic. |
2879 | |
2880 | x86_mrst_timer= [X86-32,APBT] |
2881 | Choose timer option for x86 Moorestown MID platform. |
2882 | Two valid options are apbt timer only and lapic timer |
2883 | plus one apbt timer for broadcast timer. |
2884 | x86_mrst_timer=apbt_only | lapic_and_apbt |
2885 | |
2886 | xd= [HW,XT] Original XT pre-IDE (RLL encoded) disks. |
2887 | xd_geo= See header of drivers/block/xd.c. |
2888 | |
2889 | xen_emul_unplug= [HW,X86,XEN] |
2890 | Unplug Xen emulated devices |
2891 | Format: [unplug0,][unplug1] |
2892 | ide-disks -- unplug primary master IDE devices |
2893 | aux-ide-disks -- unplug non-primary-master IDE devices |
2894 | nics -- unplug network devices |
2895 | all -- unplug all emulated devices (NICs and IDE disks) |
2896 | unnecessary -- unplugging emulated devices is |
2897 | unnecessary even if the host did not respond to |
2898 | the unplug protocol |
2899 | never -- do not unplug even if version check succeeds |
2900 | |
2901 | xirc2ps_cs= [NET,PCMCIA] |
2902 | Format: |
2903 | <irq>,<irq_mask>,<io>,<full_duplex>,<do_sound>,<lockup_hack>[,<irq2>[,<irq3>[,<irq4>]]] |
2904 | |
2905 | ______________________________________________________________________ |
2906 | |
2907 | TODO: |
2908 | |
2909 | Add more DRM drivers. |
2910 |
Branches:
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Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
v2.6.34-rc7
v3.9