Mauro Carvalho Chehab | e53dd08 | 2007-09-15 07:38:47 -0300 | [diff] [blame] | 1 | Kernel Parameters |
| 2 | ~~~~~~~~~~~~~~~~~ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Stefan Richter | a901ebb | 2006-04-01 01:43:18 +0200 | [diff] [blame] | 20 | This document may not be entirely up to date and comprehensive. The command |
| 21 | "modinfo -p ${modulename}" shows a current list of all parameters of a loadable |
| 22 | module. Loadable modules, after being loaded into the running kernel, also |
| 23 | reveal their parameters in /sys/module/${modulename}/parameters/. Some of these |
| 24 | parameters may be changed at runtime by the command |
| 25 | "echo -n ${value} > /sys/module/${modulename}/parameters/${parm}". |
| 26 | |
Stefan Richter | 6585fa8 | 2006-04-01 01:44:30 +0200 | [diff] [blame] | 27 | The parameters listed below are only valid if certain kernel build options were |
| 28 | enabled and if respective hardware is present. The text in square brackets at |
| 29 | the beginning of each description states the restrictions within which a |
| 30 | parameter is applicable: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 31 | |
| 32 | ACPI ACPI support is enabled. |
Chuck Ebbert | c99c108 | 2007-07-27 10:46:20 +1000 | [diff] [blame] | 33 | AGP AGP (Accelerated Graphics Port) is enabled. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 34 | ALSA ALSA sound support is enabled. |
| 35 | APIC APIC support is enabled. |
| 36 | APM Advanced Power Management support is enabled. |
Haavard Skinnemoen | e7ba176 | 2007-10-10 14:58:29 +0200 | [diff] [blame] | 37 | AVR32 AVR32 architecture is enabled. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 38 | AX25 Appropriate AX.25 support is enabled. |
Robin Getz | 0ae5364 | 2007-10-09 17:24:49 +0800 | [diff] [blame] | 39 | BLACKFIN Blackfin architecture is enabled. |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 40 | DRM Direct Rendering Management support is enabled. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 41 | EDD BIOS Enhanced Disk Drive Services (EDD) is enabled |
| 42 | EFI EFI Partitioning (GPT) is enabled |
| 43 | EIDE EIDE/ATAPI support is enabled. |
| 44 | FB The frame buffer device is enabled. |
| 45 | HW Appropriate hardware is enabled. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 46 | IA-64 IA-64 architecture is enabled. |
| 47 | IOSCHED More than one I/O scheduler is enabled. |
Adrian Bunk | 41e2e8b | 2005-07-12 13:58:33 -0700 | [diff] [blame] | 48 | IP_PNP IP DHCP, BOOTP, or RARP is enabled. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 49 | ISAPNP ISA PnP code is enabled. |
| 50 | ISDN Appropriate ISDN support is enabled. |
| 51 | JOY Appropriate joystick support is enabled. |
Kristen Carlson Accardi | 11ef697 | 2006-09-28 11:29:01 -0700 | [diff] [blame] | 52 | LIBATA Libata driver is enabled |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 53 | LP Printer support is enabled. |
| 54 | LOOP Loopback device support is enabled. |
| 55 | M68k M68k architecture is enabled. |
| 56 | These options have more detailed description inside of |
| 57 | Documentation/m68k/kernel-options.txt. |
| 58 | MCA MCA bus support is enabled. |
| 59 | MDA MDA console support is enabled. |
| 60 | MOUSE Appropriate mouse support is enabled. |
Matthew Wilcox | 309e57d | 2006-03-05 22:33:34 -0700 | [diff] [blame] | 61 | MSI Message Signaled Interrupts (PCI). |
Randy Dunlap | c8facbb | 2007-07-31 00:37:40 -0700 | [diff] [blame] | 62 | MTD MTD (Memory Technology Device) support is enabled. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 63 | NET Appropriate network support is enabled. |
| 64 | NUMA NUMA support is enabled. |
john stultz | 734efb4 | 2006-06-26 00:25:05 -0700 | [diff] [blame] | 65 | GENERIC_TIME The generic timeofday code is enabled. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 66 | NFS Appropriate NFS support is enabled. |
| 67 | OSS OSS sound support is enabled. |
Randy Dunlap | c8facbb | 2007-07-31 00:37:40 -0700 | [diff] [blame] | 68 | PV_OPS A paravirtualized kernel is enabled. |
| 69 | PARIDE The ParIDE (parallel port IDE) subsystem is enabled. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 70 | PARISC The PA-RISC architecture is enabled. |
| 71 | PCI PCI bus support is enabled. |
Randy Dunlap | 7f78576 | 2007-10-05 13:17:58 -0700 | [diff] [blame] | 72 | PCIE PCI Express support is enabled. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 73 | PCMCIA The PCMCIA subsystem is enabled. |
| 74 | PNP Plug & Play support is enabled. |
| 75 | PPC PowerPC architecture is enabled. |
| 76 | PPT Parallel port support is enabled. |
| 77 | PS2 Appropriate PS/2 support is enabled. |
| 78 | RAM RAM disk support is enabled. |
James Morris | 20510f2 | 2007-10-16 23:31:32 -0700 | [diff] [blame] | 79 | ROOTPLUG The example Root Plug LSM is enabled. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 80 | S390 S390 architecture is enabled. |
| 81 | SCSI Appropriate SCSI support is enabled. |
| 82 | A lot of drivers has their options described inside of |
| 83 | Documentation/scsi/. |
James Morris | 20510f2 | 2007-10-16 23:31:32 -0700 | [diff] [blame] | 84 | SECURITY Different security models are enabled. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 85 | SELINUX SELinux support is enabled. |
| 86 | SERIAL Serial support is enabled. |
Paul Mundt | e523d93 | 2007-02-28 18:30:01 +0900 | [diff] [blame] | 87 | SH SuperH architecture is enabled. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 88 | SMP The kernel is an SMP kernel. |
| 89 | SPARC Sparc architecture is enabled. |
David Brownell | 77437fd | 2008-07-23 21:28:33 -0700 | [diff] [blame] | 90 | SWSUSP Software suspend (hibernation) is enabled. |
| 91 | SUSPEND System suspend states are enabled. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 92 | TS Appropriate touchscreen support is enabled. |
| 93 | USB USB support is enabled. |
| 94 | USBHID USB Human Interface Device support is enabled. |
| 95 | V4L Video For Linux support is enabled. |
| 96 | VGA The VGA console has been enabled. |
| 97 | VT Virtual terminal support is enabled. |
| 98 | WDT Watchdog support is enabled. |
| 99 | XT IBM PC/XT MFM hard disk support is enabled. |
Alan Cox | cd4f0ef | 2007-07-31 00:37:59 -0700 | [diff] [blame] | 100 | X86-32 X86-32, aka i386 architecture is enabled. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 101 | X86-64 X86-64 architecture is enabled. |
| 102 | More X86-64 boot options can be found in |
Uwe Hermann | 71cced6 | 2008-10-20 09:32:21 -0700 | [diff] [blame] | 103 | Documentation/x86/x86_64/boot-options.txt . |
Andi Kleen | c011560 | 2008-08-22 09:53:39 +0200 | [diff] [blame] | 104 | X86 Either 32bit or 64bit x86 (same as X86-32+X86-64) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 105 | |
| 106 | In addition, the following text indicates that the option: |
| 107 | |
| 108 | BUGS= Relates to possible processor bugs on the said processor. |
| 109 | KNL Is a kernel start-up parameter. |
| 110 | BOOT Is a boot loader parameter. |
| 111 | |
| 112 | Parameters denoted with BOOT are actually interpreted by the boot |
| 113 | loader, and have no meaning to the kernel directly. |
| 114 | Do not modify the syntax of boot loader parameters without extreme |
Uwe Hermann | 71cced6 | 2008-10-20 09:32:21 -0700 | [diff] [blame] | 115 | need or coordination with <Documentation/x86/i386/boot.txt>. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 116 | |
Karsten Weiss | 5558870 | 2007-02-13 13:26:21 +0100 | [diff] [blame] | 117 | There are also arch-specific kernel-parameters not documented here. |
Uwe Hermann | 71cced6 | 2008-10-20 09:32:21 -0700 | [diff] [blame] | 118 | See for example <Documentation/x86/x86_64/boot-options.txt>. |
Karsten Weiss | 5558870 | 2007-02-13 13:26:21 +0100 | [diff] [blame] | 119 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 120 | Note that ALL kernel parameters listed below are CASE SENSITIVE, and that |
| 121 | a trailing = on the name of any parameter states that that parameter will |
| 122 | be entered as an environment variable, whereas its absence indicates that |
| 123 | it will appear as a kernel argument readable via /proc/cmdline by programs |
| 124 | running once the system is up. |
| 125 | |
jens m. noedler | 9c4751f | 2006-09-29 02:00:27 -0700 | [diff] [blame] | 126 | The number of kernel parameters is not limited, but the length of the |
| 127 | complete command line (parameters including spaces etc.) is limited to |
| 128 | a fixed number of characters. This limit depends on the architecture |
| 129 | and is between 256 and 4096 characters. It is defined in the file |
| 130 | ./include/asm/setup.h as COMMAND_LINE_SIZE. |
| 131 | |
| 132 | |
Bernhard Walle | 03d926f | 2007-03-06 02:29:44 -0800 | [diff] [blame] | 133 | acpi= [HW,ACPI,X86-64,i386] |
| 134 | Advanced Configuration and Power Interface |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 135 | Format: { force | off | ht | strict | noirq } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 136 | force -- enable ACPI if default was off |
| 137 | off -- disable ACPI if default was on |
| 138 | noirq -- do not use ACPI for IRQ routing |
| 139 | ht -- run only enough ACPI to enable Hyper Threading |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 140 | strict -- Be less tolerant of platforms that are not |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 141 | strictly ACPI specification compliant. |
| 142 | |
Randy Dunlap | 5347112 | 2008-03-12 18:10:51 -0400 | [diff] [blame] | 143 | See also Documentation/power/pm.txt, pci=noacpi |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 144 | |
Len Brown | a1fdcc0 | 2007-03-11 03:26:14 -0400 | [diff] [blame] | 145 | acpi_apic_instance= [ACPI, IOAPIC] |
| 146 | Format: <int> |
| 147 | 2: use 2nd APIC table, if available |
| 148 | 1,0: use 1st APIC table |
Len Brown | 4e381a4 | 2007-03-30 14:16:10 -0400 | [diff] [blame] | 149 | default: 0 |
Len Brown | a1fdcc0 | 2007-03-11 03:26:14 -0400 | [diff] [blame] | 150 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 151 | acpi_sleep= [HW,ACPI] Sleep options |
Shaohua Li | bdfe6b7 | 2008-07-23 21:28:41 -0700 | [diff] [blame] | 152 | Format: { s3_bios, s3_mode, s3_beep, s4_nohwsig, old_ordering } |
Pavel Machek | 23b168d | 2008-02-05 19:27:12 +0100 | [diff] [blame] | 153 | See Documentation/power/video.txt for s3_bios and s3_mode. |
| 154 | s3_beep is for debugging; it makes the PC's speaker beep |
| 155 | as soon as the kernel's real-mode entry point is called. |
Shaohua Li | bdfe6b7 | 2008-07-23 21:28:41 -0700 | [diff] [blame] | 156 | s4_nohwsig prevents ACPI hardware signature from being |
| 157 | used during resume from hibernation. |
Rafael J. Wysocki | d8f3de0 | 2008-06-12 23:24:06 +0200 | [diff] [blame] | 158 | old_ordering causes the ACPI 1.0 ordering of the _PTS |
| 159 | control method, wrt putting devices into low power |
| 160 | states, to be enforced (the ACPI 2.0 ordering of _PTS is |
| 161 | used by default). |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 162 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 163 | acpi_sci= [HW,ACPI] ACPI System Control Interrupt trigger mode |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 164 | Format: { level | edge | high | low } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 165 | |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 166 | acpi_irq_balance [HW,ACPI] |
| 167 | ACPI will balance active IRQs |
| 168 | default in APIC mode |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 169 | |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 170 | acpi_irq_nobalance [HW,ACPI] |
| 171 | ACPI will not move active IRQs (default) |
| 172 | default in PIC mode |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 173 | |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 174 | acpi_irq_pci= [HW,ACPI] If irq_balance, clear listed IRQs for |
| 175 | use by PCI |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 176 | Format: <irq>,<irq>... |
| 177 | |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 178 | acpi_irq_isa= [HW,ACPI] If irq_balance, mark listed IRQs used by ISA |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 179 | Format: <irq>,<irq>... |
| 180 | |
Len Brown | 67effe8 | 2007-07-26 00:50:06 -0400 | [diff] [blame] | 181 | acpi_no_auto_ssdt [HW,ACPI] Disable automatic loading of SSDT |
| 182 | |
Len Brown | a1f9e65 | 2006-01-25 23:47:36 -0500 | [diff] [blame] | 183 | acpi_os_name= [HW,ACPI] Tell ACPI BIOS the name of the OS |
| 184 | Format: To spoof as Windows 98: ="Microsoft Windows" |
| 185 | |
Len Brown | ae00d81 | 2007-05-29 18:43:33 -0400 | [diff] [blame] | 186 | acpi_osi= [HW,ACPI] Modify list of supported OS interface strings |
| 187 | acpi_osi="string1" # add string1 -- only one string |
| 188 | acpi_osi="!string2" # remove built-in string2 |
| 189 | acpi_osi= # disable all strings |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 190 | |
| 191 | acpi_serialize [HW,ACPI] force serialization of AML methods |
| 192 | |
| 193 | acpi_skip_timer_override [HW,ACPI] |
| 194 | Recognize and ignore IRQ0/pin2 Interrupt Override. |
| 195 | For broken nForce2 BIOS resulting in XT-PIC timer. |
Andi Kleen | fa18f47 | 2006-11-14 16:57:46 +0100 | [diff] [blame] | 196 | acpi_use_timer_override [HW,ACPI} |
| 197 | Use timer override. For some broken Nvidia NF5 boards |
| 198 | that require a timer override, but don't have |
| 199 | HPET |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 200 | |
Zhang Rui | f989106 | 2007-04-24 13:53:22 +0800 | [diff] [blame] | 201 | acpi.debug_layer= [HW,ACPI] |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 202 | Format: <int> |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 203 | Each bit of the <int> indicates an ACPI debug layer, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 204 | 1: enable, 0: disable. It is useful for boot time |
| 205 | debugging. After system has booted up, it can be set |
Zhang Rui | f989106 | 2007-04-24 13:53:22 +0800 | [diff] [blame] | 206 | via /sys/module/acpi/parameters/debug_layer. |
| 207 | CONFIG_ACPI_DEBUG must be enabled for this to produce any output. |
| 208 | Available bits (add the numbers together) to enable debug output |
| 209 | for specific parts of the ACPI subsystem: |
| 210 | 0x01 utilities 0x02 hardware 0x04 events 0x08 tables |
| 211 | 0x10 namespace 0x20 parser 0x40 dispatcher |
| 212 | 0x80 executer 0x100 resources 0x200 acpica debugger |
| 213 | 0x400 os services 0x800 acpica disassembler. |
| 214 | The number can be in decimal or prefixed with 0x in hex. |
| 215 | Warning: Many of these options can produce a lot of |
| 216 | output and make your system unusable. Be very careful. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 217 | |
Zhang Rui | f989106 | 2007-04-24 13:53:22 +0800 | [diff] [blame] | 218 | acpi.debug_level= [HW,ACPI] |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 219 | Format: <int> |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 220 | Each bit of the <int> indicates an ACPI debug level, |
Thomas Renninger | 36eec5e | 2008-08-11 15:03:20 +0200 | [diff] [blame] | 221 | which corresponds to the level in an ACPI_DEBUG_PRINT |
| 222 | statement. After system has booted up, this mask |
| 223 | can be set via /sys/module/acpi/parameters/debug_level. |
| 224 | |
| 225 | CONFIG_ACPI_DEBUG must be enabled for this to produce |
| 226 | any output. The number can be in decimal or prefixed |
| 227 | with 0x in hex. Some of these options produce so much |
| 228 | output that the system is unusable. |
| 229 | |
| 230 | The following global components are defined by the |
| 231 | ACPI CA: |
| 232 | 0x01 error |
| 233 | 0x02 warn |
| 234 | 0x04 init |
| 235 | 0x08 debug object |
| 236 | 0x10 info |
| 237 | 0x20 init names |
| 238 | 0x40 parse |
| 239 | 0x80 load |
| 240 | 0x100 dispatch |
| 241 | 0x200 execute |
| 242 | 0x400 names |
| 243 | 0x800 operation region |
| 244 | 0x1000 bfield |
| 245 | 0x2000 tables |
| 246 | 0x4000 values |
| 247 | 0x8000 objects |
| 248 | 0x10000 resources |
| 249 | 0x20000 user requests |
| 250 | 0x40000 package |
| 251 | The number can be in decimal or prefixed with 0x in hex. |
| 252 | Warning: Many of these options can produce a lot of |
| 253 | output and make your system unusable. Be very careful. |
Zhang Rui | f989106 | 2007-04-24 13:53:22 +0800 | [diff] [blame] | 254 | |
Zhao Yakui | f5adfaa | 2008-08-11 14:57:50 +0800 | [diff] [blame] | 255 | acpi.power_nocheck= [HW,ACPI] |
| 256 | Format: 1/0 enable/disable the check of power state. |
| 257 | On some bogus BIOS the _PSC object/_STA object of |
| 258 | power resource can't return the correct device power |
| 259 | state. In such case it is unneccessary to check its |
| 260 | power state again in power transition. |
| 261 | 1 : disable the power state check |
| 262 | |
Alan Cox | cd4f0ef | 2007-07-31 00:37:59 -0700 | [diff] [blame] | 263 | acpi_pm_good [X86-32,X86-64] |
john stultz | 5d0cf41 | 2006-06-26 00:25:12 -0700 | [diff] [blame] | 264 | Override the pmtimer bug detection: force the kernel |
| 265 | to assume that this machine's pmtimer latches its value |
| 266 | and always returns good values. |
| 267 | |
Chuck Ebbert | c99c108 | 2007-07-27 10:46:20 +1000 | [diff] [blame] | 268 | agp= [AGP] |
| 269 | { off | try_unsupported } |
| 270 | off: disable AGP support |
| 271 | try_unsupported: try to drive unsupported chipsets |
| 272 | (may crash computer or cause data corruption) |
| 273 | |
Chuck Ebbert | 66759a0 | 2005-09-12 18:49:25 +0200 | [diff] [blame] | 274 | enable_timer_pin_1 [i386,x86-64] |
| 275 | Enable PIN 1 of APIC timer |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 276 | Can be useful to work around chipset bugs |
| 277 | (in particular on some ATI chipsets). |
Chuck Ebbert | 66759a0 | 2005-09-12 18:49:25 +0200 | [diff] [blame] | 278 | The kernel tries to set a reasonable default. |
| 279 | |
| 280 | disable_timer_pin_1 [i386,x86-64] |
| 281 | Disable PIN 1 of APIC timer |
| 282 | Can be useful to work around chipset bugs. |
| 283 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 284 | ad1848= [HW,OSS] |
| 285 | Format: <io>,<irq>,<dma>,<dma2>,<type> |
| 286 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 287 | advansys= [HW,SCSI] |
| 288 | See header of drivers/scsi/advansys.c. |
| 289 | |
| 290 | advwdt= [HW,WDT] Advantech WDT |
| 291 | Format: <iostart>,<iostop> |
| 292 | |
| 293 | aedsp16= [HW,OSS] Audio Excel DSP 16 |
| 294 | Format: <io>,<irq>,<dma>,<mss_io>,<mpu_io>,<mpu_irq> |
| 295 | See also header of sound/oss/aedsp16.c. |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 296 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 297 | aha152x= [HW,SCSI] |
| 298 | See Documentation/scsi/aha152x.txt. |
| 299 | |
| 300 | aha1542= [HW,SCSI] |
| 301 | Format: <portbase>[,<buson>,<busoff>[,<dmaspeed>]] |
| 302 | |
| 303 | aic7xxx= [HW,SCSI] |
| 304 | See Documentation/scsi/aic7xxx.txt. |
| 305 | |
| 306 | aic79xx= [HW,SCSI] |
| 307 | See Documentation/scsi/aic79xx.txt. |
| 308 | |
Joerg Roedel | 54b4cbd | 2008-06-26 21:28:10 +0200 | [diff] [blame] | 309 | amd_iommu= [HW,X86-84] |
| 310 | Pass parameters to the AMD IOMMU driver in the system. |
| 311 | Possible values are: |
Joerg Roedel | 54b4cbd | 2008-06-26 21:28:10 +0200 | [diff] [blame] | 312 | isolate - enable device isolation (each device, as far |
| 313 | as possible, will get its own protection |
| 314 | domain) |
FUJITA Tomonori | afa9fdc | 2008-09-20 01:23:30 +0900 | [diff] [blame] | 315 | fullflush - enable flushing of IO/TLB entries when |
| 316 | they are unmapped. Otherwise they are |
| 317 | flushed before they will be reused, which |
| 318 | is a lot of faster |
| 319 | |
Joerg Roedel | 54b4cbd | 2008-06-26 21:28:10 +0200 | [diff] [blame] | 320 | amd_iommu_size= [HW,X86-64] |
| 321 | Define the size of the aperture for the AMD IOMMU |
| 322 | driver. Possible values are: |
| 323 | '32M', '64M' (default), '128M', '256M', '512M', '1G' |
| 324 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 325 | amijoy.map= [HW,JOY] Amiga joystick support |
| 326 | Map of devices attached to JOY0DAT and JOY1DAT |
| 327 | Format: <a>,<b> |
| 328 | See also Documentation/kernel/input/joystick.txt |
| 329 | |
| 330 | analog.map= [HW,JOY] Analog joystick and gamepad support |
| 331 | Specifies type or capabilities of an analog joystick |
| 332 | connected to one of 16 gameports |
| 333 | Format: <type1>,<type2>,..<type16> |
| 334 | |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 335 | apc= [HW,SPARC] |
| 336 | Power management functions (SPARCstation-4/5 + deriv.) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 337 | Format: noidle |
| 338 | Disable APC CPU standby support. SPARCstation-Fox does |
| 339 | not play well with APC CPU idle - disable it if you have |
| 340 | APC and your system crashes randomly. |
| 341 | |
Randy Dunlap | c8facbb | 2007-07-31 00:37:40 -0700 | [diff] [blame] | 342 | apic= [APIC,i386] Advanced Programmable Interrupt Controller |
| 343 | Change the output verbosity whilst booting |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 344 | Format: { quiet (default) | verbose | debug } |
| 345 | Change the amount of debugging information output |
| 346 | when initialising the APIC and IO-APIC components. |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 347 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 348 | apm= [APM] Advanced Power Management |
Pavel Machek | 71f7705 | 2008-07-04 09:59:43 -0700 | [diff] [blame] | 349 | See header of arch/x86/kernel/apm_32.c. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 350 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 351 | arcrimi= [HW,NET] ARCnet - "RIM I" (entirely mem-mapped) cards |
| 352 | Format: <io>,<irq>,<nodeID> |
| 353 | |
| 354 | ataflop= [HW,M68k] |
| 355 | |
| 356 | atarimouse= [HW,MOUSE] Atari Mouse |
| 357 | |
| 358 | atascsi= [HW,SCSI] Atari SCSI |
| 359 | |
| 360 | atkbd.extra= [HW] Enable extra LEDs and keys on IBM RapidAccess, |
| 361 | EzKey and similar keyboards |
| 362 | |
| 363 | atkbd.reset= [HW] Reset keyboard during initialization |
| 364 | |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 365 | atkbd.set= [HW] Select keyboard code set |
| 366 | Format: <int> (2 = AT (default), 3 = PS/2) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 367 | |
| 368 | atkbd.scroll= [HW] Enable scroll wheel on MS Office and similar |
| 369 | keyboards |
| 370 | |
| 371 | atkbd.softraw= [HW] Choose between synthetic and real raw mode |
| 372 | Format: <bool> (0 = real, 1 = synthetic (default)) |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 373 | |
| 374 | atkbd.softrepeat= [HW] |
| 375 | Use software keyboard repeat |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 376 | |
| 377 | autotest [IA64] |
| 378 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 379 | baycom_epp= [HW,AX25] |
| 380 | Format: <io>,<mode> |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 381 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 382 | baycom_par= [HW,AX25] BayCom Parallel Port AX.25 Modem |
| 383 | Format: <io>,<mode> |
| 384 | See header of drivers/net/hamradio/baycom_par.c. |
| 385 | |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 386 | baycom_ser_fdx= [HW,AX25] |
| 387 | BayCom Serial Port AX.25 Modem (Full Duplex Mode) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 388 | Format: <io>,<irq>,<mode>[,<baud>] |
| 389 | See header of drivers/net/hamradio/baycom_ser_fdx.c. |
| 390 | |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 391 | baycom_ser_hdx= [HW,AX25] |
| 392 | BayCom Serial Port AX.25 Modem (Half Duplex Mode) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 393 | Format: <io>,<irq>,<mode> |
| 394 | See header of drivers/net/hamradio/baycom_ser_hdx.c. |
| 395 | |
Randy Dunlap | bfe8df3 | 2007-10-16 01:23:46 -0700 | [diff] [blame] | 396 | boot_delay= Milliseconds to delay each printk during boot. |
| 397 | Values larger than 10 seconds (10000) are changed to |
| 398 | no delay (0). |
| 399 | Format: integer |
| 400 | |
Andreas Herrmann | 35fc908 | 2008-08-20 14:08:58 -0700 | [diff] [blame] | 401 | bootmem_debug [KNL] Enable bootmem allocator debug messages. |
| 402 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 403 | bttv.card= [HW,V4L] bttv (bt848 + bt878 based grabber cards) |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 404 | bttv.radio= Most important insmod options are available as |
| 405 | kernel args too. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 406 | bttv.pll= See Documentation/video4linux/bttv/Insmod-options |
| 407 | bttv.tuner= and Documentation/video4linux/bttv/CARDLIST |
| 408 | |
| 409 | BusLogic= [HW,SCSI] |
| 410 | See drivers/scsi/BusLogic.c, comment before function |
| 411 | BusLogic_ParseDriverOptions(). |
| 412 | |
| 413 | c101= [NET] Moxa C101 synchronous serial card |
| 414 | |
Alan Cox | cd4f0ef | 2007-07-31 00:37:59 -0700 | [diff] [blame] | 415 | cachesize= [BUGS=X86-32] Override level 2 CPU cache size detection. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 416 | Sometimes CPU hardware bugs make them report the cache |
| 417 | size incorrectly. The kernel will attempt work arounds |
| 418 | to fix known problems, but for some CPUs it is not |
| 419 | possible to determine what the correct size should be. |
| 420 | This option provides an override for these situations. |
| 421 | |
Ahmed S. Darwish | 076c54c | 2008-03-06 18:09:10 +0200 | [diff] [blame] | 422 | security= [SECURITY] Choose a security module to enable at boot. |
| 423 | If this boot parameter is not specified, only the first |
| 424 | security module asking for security registration will be |
| 425 | loaded. An invalid security module name will be treated |
| 426 | as if no module has been chosen. |
| 427 | |
James Morris | 20510f2 | 2007-10-16 23:31:32 -0700 | [diff] [blame] | 428 | capability.disable= |
| 429 | [SECURITY] Disable capabilities. This would normally |
| 430 | be used only if an alternative security model is to be |
| 431 | configured. Potentially dangerous and should only be |
| 432 | used if you are entirely sure of the consequences. |
| 433 | |
Sebastian Ott | 14ff56b | 2008-01-26 14:10:37 +0100 | [diff] [blame] | 434 | ccw_timeout_log [S390] |
| 435 | See Documentation/s390/CommonIO for details. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 436 | |
Paul Menage | 8bab8dd | 2008-04-04 14:29:57 -0700 | [diff] [blame] | 437 | cgroup_disable= [KNL] Disable a particular controller |
| 438 | Format: {name of the controller(s) to disable} |
| 439 | {Currently supported controllers - "memory"} |
| 440 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 441 | checkreqprot [SELINUX] Set initial checkreqprot flag value. |
| 442 | Format: { "0" | "1" } |
| 443 | See security/selinux/Kconfig help text. |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 444 | 0 -- check protection applied by kernel (includes |
| 445 | any implied execute protection). |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 446 | 1 -- check protection requested by application. |
| 447 | Default value is set via a kernel config option. |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 448 | Value can be changed at runtime via |
| 449 | /selinux/checkreqprot. |
| 450 | |
Sebastian Ott | 661ca0d | 2008-01-26 14:10:36 +0100 | [diff] [blame] | 451 | cio_ignore= [S390] |
| 452 | See Documentation/s390/CommonIO for details. |
| 453 | |
Alan Cox | cd4f0ef | 2007-07-31 00:37:59 -0700 | [diff] [blame] | 454 | clock= [BUGS=X86-32, HW] gettimeofday clocksource override. |
john stultz | 734efb4 | 2006-06-26 00:25:05 -0700 | [diff] [blame] | 455 | [Deprecated] |
Matt LaPlante | 3f6dee9 | 2006-10-03 22:45:33 +0200 | [diff] [blame] | 456 | Forces specified clocksource (if available) to be used |
john stultz | 734efb4 | 2006-06-26 00:25:05 -0700 | [diff] [blame] | 457 | when calculating gettimeofday(). If specified |
Matt LaPlante | 3f6dee9 | 2006-10-03 22:45:33 +0200 | [diff] [blame] | 458 | clocksource is not available, it defaults to PIT. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 459 | Format: { pit | tsc | cyclone | pmtmr } |
| 460 | |
Randy Dunlap | 3d6ac98 | 2007-05-23 13:58:16 -0700 | [diff] [blame] | 461 | clocksource= [GENERIC_TIME] Override the default clocksource |
| 462 | Format: <string> |
| 463 | Override the default clocksource and use the clocksource |
| 464 | with the name specified. |
| 465 | Some clocksource names to choose from, depending on |
| 466 | the platform: |
| 467 | [all] jiffies (this is the base, fallback clocksource) |
| 468 | [ACPI] acpi_pm |
| 469 | [ARM] imx_timer1,OSTS,netx_timer,mpu_timer2, |
| 470 | pxa_timer,timer3,32k_counter,timer0_1 |
| 471 | [AVR32] avr32 |
Alan Cox | cd4f0ef | 2007-07-31 00:37:59 -0700 | [diff] [blame] | 472 | [X86-32] pit,hpet,tsc,vmi-timer; |
Randy Dunlap | 3d6ac98 | 2007-05-23 13:58:16 -0700 | [diff] [blame] | 473 | scx200_hrt on Geode; cyclone on IBM x440 |
| 474 | [MIPS] MIPS |
| 475 | [PARISC] cr16 |
| 476 | [S390] tod |
| 477 | [SH] SuperH |
| 478 | [SPARC64] tick |
| 479 | [X86-64] hpet,tsc |
| 480 | |
Andi Kleen | ac72e78 | 2008-01-30 13:33:21 +0100 | [diff] [blame] | 481 | clearcpuid=BITNUM [X86] |
| 482 | Disable CPUID feature X for the kernel. See |
| 483 | include/asm-x86/cpufeature.h for the valid bit numbers. |
| 484 | Note the Linux specific bits are not necessarily |
| 485 | stable over kernel options, but the vendor specific |
| 486 | ones should be. |
| 487 | Also note that user programs calling CPUID directly |
| 488 | or using the feature without checking anything |
| 489 | will still see it. This just prevents it from |
| 490 | being used by the kernel or shown in /proc/cpuinfo. |
| 491 | Also note the kernel might malfunction if you disable |
| 492 | some critical bits. |
| 493 | |
Arjan van de Ven | a25bd94 | 2008-01-30 13:33:08 +0100 | [diff] [blame] | 494 | code_bytes [IA32/X86_64] How many bytes of object code to print |
| 495 | in an oops report. |
Chuck Ebbert | 86c4183 | 2007-02-13 13:26:25 +0100 | [diff] [blame] | 496 | Range: 0 - 8192 |
| 497 | Default: 64 |
| 498 | |
Thomas Gleixner | b17530b | 2007-10-19 20:35:02 +0200 | [diff] [blame] | 499 | hpet= [X86-32,HPET] option to control HPET usage |
| 500 | Format: { enable (default) | disable | force } |
| 501 | disable: disable HPET and use PIT instead |
Carlos Corbacho | d79a5f8 | 2007-10-19 18:51:27 +0100 | [diff] [blame] | 502 | force: allow force enabled of undocumented chips (ICH4, |
| 503 | VIA, nVidia) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 504 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 505 | com20020= [HW,NET] ARCnet - COM20020 chipset |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 506 | Format: |
| 507 | <io>[,<irq>[,<nodeID>[,<backplane>[,<ckp>[,<timeout>]]]]] |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 508 | |
| 509 | com90io= [HW,NET] ARCnet - COM90xx chipset (IO-mapped buffers) |
| 510 | Format: <io>[,<irq>] |
| 511 | |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 512 | com90xx= [HW,NET] |
| 513 | ARCnet - COM90xx chipset (memory-mapped buffers) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 514 | Format: <io>[,<irq>[,<memstart>]] |
| 515 | |
| 516 | condev= [HW,S390] console device |
| 517 | conmode= |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 518 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 519 | console= [KNL] Output console device and options. |
| 520 | |
| 521 | tty<n> Use the virtual console device <n>. |
| 522 | |
| 523 | ttyS<n>[,options] |
Randy Dunlap | f1a1c2d | 2006-03-25 03:08:17 -0800 | [diff] [blame] | 524 | ttyUSB0[,options] |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 525 | Use the specified serial port. The options are of |
Randy Dunlap | f1a1c2d | 2006-03-25 03:08:17 -0800 | [diff] [blame] | 526 | the form "bbbbpnf", where "bbbb" is the baud rate, |
| 527 | "p" is parity ("n", "o", or "e"), "n" is number of |
| 528 | bits, and "f" is flow control ("r" for RTS or |
| 529 | omit it). Default is "9600n8". |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 530 | |
Randy Dunlap | f1a1c2d | 2006-03-25 03:08:17 -0800 | [diff] [blame] | 531 | See Documentation/serial-console.txt for more |
| 532 | information. See |
| 533 | Documentation/networking/netconsole.txt for an |
| 534 | alternative. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 535 | |
Yinghai Lu | 18a8bd9 | 2007-07-15 23:37:59 -0700 | [diff] [blame] | 536 | uart[8250],io,<addr>[,options] |
| 537 | uart[8250],mmio,<addr>[,options] |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 538 | Start an early, polled-mode console on the 8250/16550 |
| 539 | UART at the specified I/O port or MMIO address, |
| 540 | switching to the matching ttyS device later. The |
| 541 | options are the same as for ttyS, above. |
| 542 | |
Samuel Thibault | f7511d5 | 2008-04-30 00:54:51 -0700 | [diff] [blame] | 543 | If the device connected to the port is not a TTY but a braille |
| 544 | device, prepend "brl," before the device type, for instance |
| 545 | console=brl,ttyS0 |
| 546 | For now, only VisioBraille is supported. |
| 547 | |
Yinghai Lu | 18a8bd9 | 2007-07-15 23:37:59 -0700 | [diff] [blame] | 548 | earlycon= [KNL] Output early console device and options. |
| 549 | uart[8250],io,<addr>[,options] |
| 550 | uart[8250],mmio,<addr>[,options] |
| 551 | Start an early, polled-mode console on the 8250/16550 |
| 552 | UART at the specified I/O port or MMIO address. |
| 553 | The options are the same as for ttyS, above. |
| 554 | |
Andres Salomon | 8f4ce8c | 2007-10-18 03:04:50 -0700 | [diff] [blame] | 555 | no_console_suspend |
| 556 | [HW] Never suspend the console |
| 557 | Disable suspending of consoles during suspend and |
| 558 | hibernate operations. Once disabled, debugging |
| 559 | messages can reach various consoles while the rest |
| 560 | of the system is being put to sleep (ie, while |
| 561 | debugging driver suspend/resume hooks). This may |
| 562 | not work reliably with all consoles, but is known |
| 563 | to work with serial and VGA consoles. |
| 564 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 565 | cpcihp_generic= [HW,PCI] Generic port I/O CompactPCI driver |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 566 | Format: |
| 567 | <first_slot>,<last_slot>,<port>,<enum_bit>[,<debug>] |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 568 | |
Eric W. Biederman | dc009d9 | 2005-06-25 14:57:52 -0700 | [diff] [blame] | 569 | crashkernel=nn[KMG]@ss[KMG] |
| 570 | [KNL] Reserve a chunk of physical memory to |
| 571 | hold a kernel to switch to with kexec on panic. |
| 572 | |
Bernhard Walle | fb39159 | 2007-10-18 23:41:02 -0700 | [diff] [blame] | 573 | crashkernel=range1:size1[,range2:size2,...][@offset] |
| 574 | [KNL] Same as above, but depends on the memory |
| 575 | in the running system. The syntax of range is |
| 576 | start-[end] where start and end are both |
| 577 | a memory unit (amount[KMG]). See also |
| 578 | Documentation/kdump/kdump.txt for a example. |
| 579 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 580 | cs4232= [HW,OSS] |
| 581 | Format: <io>,<irq>,<dma>,<dma2>,<mpuio>,<mpuirq> |
| 582 | |
| 583 | cs89x0_dma= [HW,NET] |
| 584 | Format: <dma> |
| 585 | |
| 586 | cs89x0_media= [HW,NET] |
| 587 | Format: { rj45 | aui | bnc } |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 588 | |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 589 | dasd= [HW,NET] |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 590 | See header of drivers/s390/block/dasd_devmap.c. |
| 591 | |
| 592 | db9.dev[2|3]= [HW,JOY] Multisystem joystick support via parallel port |
| 593 | (one device per port) |
| 594 | Format: <port#>,<type> |
| 595 | See also Documentation/input/joystick-parport.txt |
| 596 | |
| 597 | debug [KNL] Enable kernel debugging (events log level). |
| 598 | |
Ingo Molnar | cae2ed9 | 2006-07-03 00:24:48 -0700 | [diff] [blame] | 599 | debug_locks_verbose= |
| 600 | [KNL] verbose self-tests |
| 601 | Format=<0|1> |
| 602 | Print debugging info while doing the locking API |
| 603 | self-tests. |
| 604 | We default to 0 (no extra messages), setting it to |
| 605 | 1 will print _a lot_ more information - normally |
| 606 | only useful to kernel developers. |
| 607 | |
Thomas Gleixner | 3ac7fe5 | 2008-04-30 00:55:01 -0700 | [diff] [blame] | 608 | debug_objects [KNL] Enable object debugging |
| 609 | |
Thomas Gleixner | d3af01f | 2008-07-15 15:04:56 +0200 | [diff] [blame] | 610 | debugpat [X86] Enable PAT debugging |
| 611 | |
Robert P. J. Day | 2d27a96 | 2008-02-03 15:18:45 +0200 | [diff] [blame] | 612 | decnet.addr= [HW,NET] |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 613 | Format: <area>[,<node>] |
| 614 | See also Documentation/networking/decnet.txt. |
| 615 | |
Samuel Thibault | ecb77fa | 2008-01-03 16:17:54 +0000 | [diff] [blame] | 616 | vt.default_blu= [VT] |
Antonino A. Daplas | 55ff978 | 2007-05-08 00:38:53 -0700 | [diff] [blame] | 617 | Format: <blue0>,<blue1>,<blue2>,...,<blue15> |
| 618 | Change the default blue palette of the console. |
| 619 | This is a 16-member array composed of values |
| 620 | ranging from 0-255. |
| 621 | |
Samuel Thibault | ecb77fa | 2008-01-03 16:17:54 +0000 | [diff] [blame] | 622 | vt.default_grn= [VT] |
Antonino A. Daplas | 55ff978 | 2007-05-08 00:38:53 -0700 | [diff] [blame] | 623 | Format: <green0>,<green1>,<green2>,...,<green15> |
| 624 | Change the default green palette of the console. |
| 625 | This is a 16-member array composed of values |
| 626 | ranging from 0-255. |
| 627 | |
Samuel Thibault | ecb77fa | 2008-01-03 16:17:54 +0000 | [diff] [blame] | 628 | vt.default_red= [VT] |
Antonino A. Daplas | 55ff978 | 2007-05-08 00:38:53 -0700 | [diff] [blame] | 629 | Format: <red0>,<red1>,<red2>,...,<red15> |
| 630 | Change the default red palette of the console. |
| 631 | This is a 16-member array composed of values |
| 632 | ranging from 0-255. |
| 633 | |
Samuel Thibault | ecb77fa | 2008-01-03 16:17:54 +0000 | [diff] [blame] | 634 | vt.default_utf8= |
| 635 | [VT] |
Antonino A. Daplas | 55ff978 | 2007-05-08 00:38:53 -0700 | [diff] [blame] | 636 | Format=<0|1> |
| 637 | Set system-wide default UTF-8 mode for all tty's. |
Samuel Thibault | ecb77fa | 2008-01-03 16:17:54 +0000 | [diff] [blame] | 638 | Default is 1, i.e. UTF-8 mode is enabled for all |
| 639 | newly opened terminals. |
Antonino A. Daplas | 55ff978 | 2007-05-08 00:38:53 -0700 | [diff] [blame] | 640 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 641 | dhash_entries= [KNL] |
| 642 | Set number of hash buckets for dentry cache. |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 643 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 644 | digi= [HW,SERIAL] |
| 645 | IO parameters + enable/disable command. |
| 646 | |
| 647 | digiepca= [HW,SERIAL] |
| 648 | See drivers/char/README.epca and |
| 649 | Documentation/digiepca.txt. |
| 650 | |
Yinghai Lu | 95ffa24 | 2008-04-29 03:52:33 -0700 | [diff] [blame] | 651 | disable_mtrr_cleanup [X86] |
| 652 | enable_mtrr_cleanup [X86] |
| 653 | The kernel tries to adjust MTRR layout from continuous |
| 654 | to discrete, to make X server driver able to add WB |
| 655 | entry later. This parameter enables/disables that. |
| 656 | |
| 657 | mtrr_chunk_size=nn[KMG] [X86] |
| 658 | used for mtrr cleanup. It is largest continous chunk |
| 659 | that could hold holes aka. UC entries. |
| 660 | |
| 661 | mtrr_gran_size=nn[KMG] [X86] |
Yinghai Lu | 12031a6 | 2008-05-02 02:40:22 -0700 | [diff] [blame] | 662 | Used for mtrr cleanup. It is granularity of mtrr block. |
| 663 | Default is 1. |
| 664 | Large value could prevent small alignment from |
| 665 | using up MTRRs. |
| 666 | |
| 667 | mtrr_spare_reg_nr=n [X86] |
| 668 | Format: <integer> |
| 669 | Range: 0,7 : spare reg number |
| 670 | Default : 1 |
| 671 | Used for mtrr cleanup. It is spare mtrr entries number. |
| 672 | Set to 2 or more if your graphical card needs more. |
Yinghai Lu | 95ffa24 | 2008-04-29 03:52:33 -0700 | [diff] [blame] | 673 | |
Yinghai Lu | 093af8d | 2008-01-30 13:33:32 +0100 | [diff] [blame] | 674 | disable_mtrr_trim [X86, Intel and AMD only] |
Jesse Barnes | 99fc8d4 | 2008-01-30 13:33:18 +0100 | [diff] [blame] | 675 | By default the kernel will trim any uncacheable |
| 676 | memory out of your available memory pool based on |
| 677 | MTRR settings. This parameter disables that behavior, |
| 678 | possibly causing your machine to run very slowly. |
| 679 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 680 | dmasound= [HW,OSS] Sound subsystem buffers |
| 681 | |
| 682 | dscc4.setup= [NET] |
| 683 | |
| 684 | dtc3181e= [HW,SCSI] |
| 685 | |
Robin Getz | 0ae5364 | 2007-10-09 17:24:49 +0800 | [diff] [blame] | 686 | earlyprintk= [X86-32,X86-64,SH,BLACKFIN] |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 687 | earlyprintk=vga |
| 688 | earlyprintk=serial[,ttySn[,baudrate]] |
Yinghai Lu | 5c05917 | 2008-07-24 17:29:40 -0700 | [diff] [blame] | 689 | earlyprintk=dbgp |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 690 | |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 691 | Append ",keep" to not disable it when the real console |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 692 | takes over. |
| 693 | |
Yinghai Lu | 5c05917 | 2008-07-24 17:29:40 -0700 | [diff] [blame] | 694 | Only vga or serial or usb debug port at a time. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 695 | |
| 696 | Currently only ttyS0 and ttyS1 are supported. |
| 697 | |
| 698 | Interaction with the standard serial driver is not |
| 699 | very good. |
| 700 | |
| 701 | The VGA output is eventually overwritten by the real |
| 702 | console. |
| 703 | |
| 704 | eata= [HW,SCSI] |
| 705 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 706 | edd= [EDD] |
Tim Gardner | 8c4dd60 | 2008-04-29 01:02:45 -0700 | [diff] [blame] | 707 | Format: {"off" | "on" | "skip[mbr]"} |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 708 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 709 | eisa_irq_edge= [PARISC,HW] |
| 710 | See header of drivers/parisc/eisa.c. |
| 711 | |
Alan Cox | cd4f0ef | 2007-07-31 00:37:59 -0700 | [diff] [blame] | 712 | elanfreq= [X86-32] |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 713 | See comment before function elanfreq_setup() in |
Pavel Machek | 71f7705 | 2008-07-04 09:59:43 -0700 | [diff] [blame] | 714 | arch/x86/kernel/cpu/cpufreq/elanfreq.c. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 715 | |
| 716 | elevator= [IOSCHED] |
Randy Dunlap | 16ab3ad | 2006-01-14 13:21:20 -0800 | [diff] [blame] | 717 | Format: {"anticipatory" | "cfq" | "deadline" | "noop"} |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 718 | See Documentation/block/as-iosched.txt and |
| 719 | Documentation/block/deadline-iosched.txt for details. |
| 720 | |
Simon Horman | e515a0d | 2008-10-18 20:28:27 -0700 | [diff] [blame] | 721 | elfcorehdr= [IA64,PPC,SH,X86-32,X86_64] |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 722 | Specifies physical address of start of kernel core |
Vivek Goyal | aac04b3 | 2006-01-09 20:51:47 -0800 | [diff] [blame] | 723 | image elf header. Generally kexec loader will |
| 724 | pass this option to capture kernel. |
| 725 | See Documentation/kdump/kdump.txt for details. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 726 | |
| 727 | enforcing [SELINUX] Set initial enforcing status. |
| 728 | Format: {"0" | "1"} |
| 729 | See security/selinux/Kconfig help text. |
| 730 | 0 -- permissive (log only, no denials). |
| 731 | 1 -- enforcing (deny and log). |
| 732 | Default value is 0. |
| 733 | Value can be changed at runtime via /selinux/enforce. |
| 734 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 735 | es1371= [HW,OSS] |
| 736 | Format: <spdif>,[<nomix>,[<amplifier>]] |
| 737 | See also header of sound/oss/es1371.c. |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 738 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 739 | ether= [HW,NET] Ethernet cards parameters |
| 740 | This option is obsoleted by the "netdev=" option, which |
| 741 | has equivalent usage. See its documentation for details. |
| 742 | |
| 743 | eurwdt= [HW,WDT] Eurotech CPU-1220/1410 onboard watchdog. |
| 744 | Format: <io>[,<irq>] |
| 745 | |
Akinobu Mita | de1ba09 | 2006-12-08 02:39:42 -0800 | [diff] [blame] | 746 | failslab= |
| 747 | fail_page_alloc= |
| 748 | fail_make_request=[KNL] |
| 749 | General fault injection mechanism. |
| 750 | Format: <interval>,<probability>,<space>,<times> |
| 751 | See also /Documentation/fault-injection/. |
| 752 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 753 | fd_mcs= [HW,SCSI] |
| 754 | See header of drivers/scsi/fd_mcs.c. |
| 755 | |
| 756 | fdomain= [HW,SCSI] |
| 757 | See header of drivers/scsi/fdomain.c. |
| 758 | |
| 759 | floppy= [HW] |
| 760 | See Documentation/floppy.txt. |
| 761 | |
Alex Chiang | f13ae30 | 2008-05-08 14:03:23 -0600 | [diff] [blame] | 762 | force_pal_cache_flush |
| 763 | [IA-64] Avoid check_sal_cache_flush which may hang on |
| 764 | buggy SAL_CACHE_FLUSH implementations. Using this |
| 765 | parameter will force ia64_sal_cache_flush to call |
| 766 | ia64_pal_cache_flush instead of SAL_CACHE_FLUSH. |
| 767 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 768 | gamecon.map[2|3]= |
| 769 | [HW,JOY] Multisystem joystick and NES/SNES/PSX pad |
| 770 | support via parallel port (up to 5 devices per port) |
| 771 | Format: <port#>,<pad1>,<pad2>,<pad3>,<pad4>,<pad5> |
| 772 | See also Documentation/input/joystick-parport.txt |
| 773 | |
| 774 | gamma= [HW,DRM] |
| 775 | |
Yinghai Lu | aaf2304 | 2008-01-30 13:33:09 +0100 | [diff] [blame] | 776 | gart_fix_e820= [X86_64] disable the fix e820 for K8 GART |
| 777 | Format: off | on |
| 778 | default: on |
| 779 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 780 | gdth= [HW,SCSI] |
| 781 | See header of drivers/scsi/gdth.c. |
| 782 | |
| 783 | gpt [EFI] Forces disk with valid GPT signature but |
| 784 | invalid Protective MBR to be treated as GPT. |
| 785 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 786 | gvp11= [HW,SCSI] |
| 787 | |
| 788 | hashdist= [KNL,NUMA] Large hashes allocated during boot |
| 789 | are distributed across NUMA nodes. Defaults on |
| 790 | for IA-64, off otherwise. |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 791 | Format: 0 | 1 (for off | on) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 792 | |
| 793 | hcl= [IA-64] SGI's Hardware Graph compatibility layer |
| 794 | |
| 795 | hd= [EIDE] (E)IDE hard drive subsystem geometry |
| 796 | Format: <cyl>,<head>,<sect> |
| 797 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 798 | highmem=nn[KMG] [KNL,BOOT] forces the highmem zone to have an exact |
| 799 | size of <nn>. This works even on boxes that have no |
| 800 | highmem otherwise. This also works to reduce highmem |
| 801 | size on bigger boxes. |
| 802 | |
Thomas Gleixner | 54cdfdb | 2007-02-16 01:28:11 -0800 | [diff] [blame] | 803 | highres= [KNL] Enable/disable high resolution timer mode. |
| 804 | Valid parameters: "on", "off" |
| 805 | Default: "on" |
| 806 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 807 | hisax= [HW,ISDN] |
| 808 | See Documentation/isdn/README.HiSax. |
| 809 | |
Andi Kleen | b4718e6 | 2008-07-23 21:27:51 -0700 | [diff] [blame] | 810 | hugepages= [HW,X86-32,IA-64] HugeTLB pages to allocate at boot. |
| 811 | hugepagesz= [HW,IA-64,PPC,X86-64] The size of the HugeTLB pages. |
Jon Tollefson | 0d9ea75 | 2008-07-23 21:27:56 -0700 | [diff] [blame] | 812 | On x86-64 and powerpc, this option can be specified |
| 813 | multiple times interleaved with hugepages= to reserve |
| 814 | huge pages of different sizes. Valid pages sizes on |
| 815 | x86-64 are 2M (when the CPU supports "pse") and 1G |
| 816 | (when the CPU supports the "pdpe1gb" cpuinfo flag) |
Andi Kleen | b4718e6 | 2008-07-23 21:27:51 -0700 | [diff] [blame] | 817 | Note that 1GB pages can only be allocated at boot time |
| 818 | using hugepages= and not freed afterwards. |
Nick Piggin | e11bfbf | 2008-07-23 21:27:52 -0700 | [diff] [blame] | 819 | default_hugepagesz= |
| 820 | [same as hugepagesz=] The size of the default |
| 821 | HugeTLB page size. This is the size represented by |
| 822 | the legacy /proc/ hugepages APIs, used for SHM, and |
| 823 | default size when mounting hugetlbfs filesystems. |
| 824 | Defaults to the default architecture's huge page size |
| 825 | if not specified. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 826 | |
Paul Mundt | 6902aa8 | 2008-09-21 17:14:42 +0900 | [diff] [blame] | 827 | hlt [BUGS=ARM,SH] |
| 828 | |
Jiri Kosina | 36d9573 | 2008-10-06 02:51:09 -0400 | [diff] [blame] | 829 | i8042.debug [HW] Toggle i8042 debug mode |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 830 | i8042.direct [HW] Put keyboard port into non-translated mode |
Matt LaPlante | 84eb8d0 | 2006-10-03 22:53:09 +0200 | [diff] [blame] | 831 | i8042.dumbkbd [HW] Pretend that controller can only read data from |
| 832 | keyboard and cannot control its state |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 833 | (Don't attempt to blink the leds) |
| 834 | i8042.noaux [HW] Don't check for auxiliary (== mouse) port |
Dmitry Torokhov | 945ef0d | 2005-09-04 01:42:00 -0500 | [diff] [blame] | 835 | i8042.nokbd [HW] Don't check/create keyboard port |
Jiri Kosina | 75d08c7 | 2008-03-13 16:13:59 -0400 | [diff] [blame] | 836 | i8042.noloop [HW] Disable the AUX Loopback command while probing |
| 837 | for the AUX port |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 838 | i8042.nomux [HW] Don't check presence of an active multiplexing |
| 839 | controller |
| 840 | i8042.nopnp [HW] Don't use ACPIPnP / PnPBIOS to discover KBD/AUX |
| 841 | controllers |
| 842 | i8042.panicblink= |
| 843 | [HW] Frequency with which keyboard LEDs should blink |
| 844 | when kernel panics (default is 0.5 sec) |
| 845 | i8042.reset [HW] Reset the controller during init and cleanup |
| 846 | i8042.unlock [HW] Unlock (ignore) the keylock |
| 847 | |
| 848 | i810= [HW,DRM] |
| 849 | |
Dmitry Torokhov | e70c9d5 | 2005-06-25 14:54:25 -0700 | [diff] [blame] | 850 | i8k.ignore_dmi [HW] Continue probing hardware even if DMI data |
| 851 | indicates that the driver is running on unsupported |
| 852 | hardware. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 853 | i8k.force [HW] Activate i8k driver even if SMM BIOS signature |
| 854 | does not match list of supported models. |
| 855 | i8k.power_status |
| 856 | [HW] Report power status in /proc/i8k |
| 857 | (disabled by default) |
| 858 | i8k.restricted [HW] Allow controlling fans only if SYS_ADMIN |
| 859 | capability is set. |
| 860 | |
| 861 | ibmmcascsi= [HW,MCA,SCSI] IBM MicroChannel SCSI adapter |
| 862 | See Documentation/mca.txt. |
| 863 | |
| 864 | icn= [HW,ISDN] |
| 865 | Format: <io>[,<membase>[,<icn_id>[,<icn_id2>]]] |
| 866 | |
| 867 | ide= [HW] (E)IDE subsystem |
Greg Kroah-Hartman | a594eeb | 2008-04-18 00:46:20 +0200 | [diff] [blame] | 868 | Format: ide=nodma or ide=doubler |
Randy Dunlap | 1c10e93 | 2008-03-07 21:53:50 +0100 | [diff] [blame] | 869 | See Documentation/ide/ide.txt. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 870 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 871 | idebus= [HW] (E)IDE subsystem - VLB/PCI bus speed |
Randy Dunlap | 1c10e93 | 2008-03-07 21:53:50 +0100 | [diff] [blame] | 872 | See Documentation/ide/ide.txt. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 873 | |
Andi Kleen | f039b75 | 2007-05-02 19:27:12 +0200 | [diff] [blame] | 874 | idle= [X86] |
Zhao Yakui | da5e09a | 2008-06-24 18:01:09 +0800 | [diff] [blame] | 875 | Format: idle=poll or idle=mwait, idle=halt, idle=nomwait |
Andi Kleen | f039b75 | 2007-05-02 19:27:12 +0200 | [diff] [blame] | 876 | Poll forces a polling idle loop that can slightly improves the performance |
| 877 | of waking up a idle CPU, but will use a lot of power and make the system |
| 878 | run hot. Not recommended. |
| 879 | idle=mwait. On systems which support MONITOR/MWAIT but the kernel chose |
| 880 | to not use it because it doesn't save as much power as a normal idle |
| 881 | loop use the MONITOR/MWAIT idle loop anyways. Performance should be the same |
| 882 | as idle=poll. |
Zhao Yakui | c1e3b37 | 2008-06-24 17:58:53 +0800 | [diff] [blame] | 883 | idle=halt. Halt is forced to be used for CPU idle. |
| 884 | In such case C2/C3 won't be used again. |
Zhao Yakui | da5e09a | 2008-06-24 18:01:09 +0800 | [diff] [blame] | 885 | idle=nomwait. Disable mwait for CPU C-states |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 886 | |
Denis Cheng | 594765a | 2008-02-06 02:57:49 +0100 | [diff] [blame] | 887 | ide-pci-generic.all-generic-ide [HW] (E)IDE subsystem |
| 888 | Claim all unknown PCI IDE storage controllers. |
| 889 | |
Ingo Molnar | 79290822 | 2006-12-06 20:40:51 -0800 | [diff] [blame] | 890 | ignore_loglevel [KNL] |
| 891 | Ignore loglevel setting - this will print /all/ |
| 892 | kernel messages to the console. Useful for debugging. |
| 893 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 894 | ihash_entries= [KNL] |
| 895 | Set number of hash buckets for inode cache. |
| 896 | |
| 897 | in2000= [HW,SCSI] |
| 898 | See header of drivers/scsi/in2000.c. |
| 899 | |
| 900 | init= [KNL] |
| 901 | Format: <full_path> |
| 902 | Run specified binary instead of /sbin/init as init |
| 903 | process. |
| 904 | |
| 905 | initcall_debug [KNL] Trace initcalls as they are executed. Useful |
| 906 | for working out where the kernel is dying during |
| 907 | startup. |
| 908 | |
| 909 | initrd= [BOOT] Specify the location of the initial ramdisk |
| 910 | |
| 911 | inport.irq= [HW] Inport (ATI XL and Microsoft) busmouse driver |
| 912 | Format: <irq> |
| 913 | |
| 914 | inttest= [IA64] |
| 915 | |
Pavel Machek | b552da8 | 2008-03-19 15:58:11 +0100 | [diff] [blame] | 916 | iommu= [x86] |
| 917 | off |
| 918 | force |
| 919 | noforce |
| 920 | biomerge |
| 921 | panic |
| 922 | nopanic |
| 923 | merge |
| 924 | nomerge |
| 925 | forcesac |
| 926 | soft |
| 927 | |
| 928 | |
Keshavamurthy, Anil S | ba39592 | 2007-10-21 16:41:49 -0700 | [diff] [blame] | 929 | intel_iommu= [DMAR] Intel IOMMU driver (DMAR) option |
| 930 | off |
| 931 | Disable intel iommu driver. |
| 932 | igfx_off [Default Off] |
| 933 | By default, gfx is mapped as normal device. If a gfx |
| 934 | device has a dedicated DMAR unit, the DMAR unit is |
| 935 | bypassed by not enabling DMAR with this option. In |
| 936 | this case, gfx device will use physical address for |
| 937 | DMA. |
Keshavamurthy, Anil S | 7d3b03c | 2007-10-21 16:41:53 -0700 | [diff] [blame] | 938 | forcedac [x86_64] |
| 939 | With this option iommu will not optimize to look |
| 940 | for io virtual address below 32 bit forcing dual |
| 941 | address cycle on pci bus for cards supporting greater |
| 942 | than 32 bit addressing. The default is to look |
| 943 | for translation below 32 bit and if not available |
| 944 | then look in the higher range. |
mark gross | 5e0d2a6 | 2008-03-04 15:22:08 -0800 | [diff] [blame] | 945 | strict [Default Off] |
| 946 | With this option on every unmap_single operation will |
| 947 | result in a hardware IOTLB flush operation as opposed |
| 948 | to batching them for performance. |
Keshavamurthy, Anil S | ba39592 | 2007-10-21 16:41:49 -0700 | [diff] [blame] | 949 | |
Rene Herman | b02aae9 | 2008-01-30 13:30:05 +0100 | [diff] [blame] | 950 | io_delay= [X86-32,X86-64] I/O delay method |
Ingo Molnar | 6e7c402 | 2008-01-30 13:30:05 +0100 | [diff] [blame] | 951 | 0x80 |
| 952 | Standard port 0x80 based delay |
| 953 | 0xed |
| 954 | Alternate port 0xed based delay (needed on some systems) |
Rene Herman | b02aae9 | 2008-01-30 13:30:05 +0100 | [diff] [blame] | 955 | udelay |
Ingo Molnar | 6e7c402 | 2008-01-30 13:30:05 +0100 | [diff] [blame] | 956 | Simple two microseconds delay |
| 957 | none |
| 958 | No delay |
Rene Herman | b02aae9 | 2008-01-30 13:30:05 +0100 | [diff] [blame] | 959 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 960 | io7= [HW] IO7 for Marvel based alpha systems |
| 961 | See comment before marvel_specify_io7 in |
| 962 | arch/alpha/kernel/core_marvel.c. |
| 963 | |
| 964 | ip= [IP_PNP] |
J. Bruce Fields | 6ded55d | 2008-04-07 15:59:03 -0400 | [diff] [blame] | 965 | See Documentation/filesystems/nfsroot.txt. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 966 | |
| 967 | ip2= [HW] Set IO/IRQ pairs for up to 4 IntelliPort boards |
Randy Dunlap | c8facbb | 2007-07-31 00:37:40 -0700 | [diff] [blame] | 968 | See comment before ip2_setup() in |
| 969 | drivers/char/ip2/ip2base.c. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 970 | |
| 971 | ips= [HW,SCSI] Adaptec / IBM ServeRAID controller |
| 972 | See header of drivers/scsi/ips.c. |
| 973 | |
Simon Horman | 72c4a13 | 2006-09-13 19:57:18 -0700 | [diff] [blame] | 974 | ports= [IP_VS_FTP] IPVS ftp helper module |
| 975 | Default is 21. |
| 976 | Up to 8 (IP_VS_APP_MAX_PORTS) ports |
| 977 | may be specified. |
| 978 | Format: <port>,<port>.... |
| 979 | |
Alan Cox | 200803d | 2005-06-28 20:45:18 -0700 | [diff] [blame] | 980 | irqfixup [HW] |
| 981 | When an interrupt is not handled search all handlers |
| 982 | for it. Intended to get systems with badly broken |
| 983 | firmware running. |
| 984 | |
| 985 | irqpoll [HW] |
| 986 | When an interrupt is not handled search all handlers |
| 987 | for it. Also check all handlers each timer |
| 988 | interrupt. Intended to get systems with badly broken |
| 989 | firmware running. |
| 990 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 991 | isapnp= [ISAPNP] |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 992 | Format: <RDP>,<reset>,<pci_scan>,<verbosity> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 993 | |
| 994 | isolcpus= [KNL,SMP] Isolate CPUs from the general scheduler. |
Derek Fults | 22f2e28 | 2006-12-06 20:37:11 -0800 | [diff] [blame] | 995 | Format: |
| 996 | <cpu number>,...,<cpu number> |
| 997 | or |
| 998 | <cpu number>-<cpu number> (must be a positive range in ascending order) |
| 999 | or a mixture |
| 1000 | <cpu number>,...,<cpu number>-<cpu number> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1001 | This option can be used to specify one or more CPUs |
| 1002 | to isolate from the general SMP balancing and scheduling |
| 1003 | algorithms. The only way to move a process onto or off |
| 1004 | an "isolated" CPU is via the CPU affinity syscalls. |
| 1005 | <cpu number> begins at 0 and the maximum value is |
| 1006 | "number of CPUs in system - 1". |
| 1007 | |
| 1008 | This option is the preferred way to isolate CPUs. The |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 1009 | alternative -- manually setting the CPU mask of all |
| 1010 | tasks in the system -- can cause problems and |
| 1011 | suboptimal load balancer performance. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1012 | |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 1013 | iucv= [HW,NET] |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1014 | |
| 1015 | js= [HW,JOY] Analog joystick |
| 1016 | See Documentation/input/joystick.txt. |
| 1017 | |
Alan Cox | cd4f0ef | 2007-07-31 00:37:59 -0700 | [diff] [blame] | 1018 | kernelcore=nn[KMG] [KNL,X86-32,IA-64,PPC,X86-64] This parameter |
Mel Gorman | ed7ed36 | 2007-07-17 04:03:14 -0700 | [diff] [blame] | 1019 | specifies the amount of memory usable by the kernel |
| 1020 | for non-movable allocations. The requested amount is |
| 1021 | spread evenly throughout all nodes in the system. The |
| 1022 | remaining memory in each node is used for Movable |
| 1023 | pages. In the event, a node is too small to have both |
| 1024 | kernelcore and Movable pages, kernelcore pages will |
| 1025 | take priority and other nodes will have a larger number |
| 1026 | of kernelcore pages. The Movable zone is used for the |
| 1027 | allocation of pages that may be reclaimed or moved |
| 1028 | by the page migration subsystem. This means that |
| 1029 | HugeTLB pages may not be allocated from this zone. |
| 1030 | Note that allocations like PTEs-from-HighMem still |
| 1031 | use the HighMem zone if it exists, and the Normal |
| 1032 | zone if it does not. |
| 1033 | |
Alan Cox | cd4f0ef | 2007-07-31 00:37:59 -0700 | [diff] [blame] | 1034 | movablecore=nn[KMG] [KNL,X86-32,IA-64,PPC,X86-64] This parameter |
Mel Gorman | 7e63efe | 2007-07-17 04:03:15 -0700 | [diff] [blame] | 1035 | is similar to kernelcore except it specifies the |
| 1036 | amount of memory used for migratable allocations. |
| 1037 | If both kernelcore and movablecore is specified, |
| 1038 | then kernelcore will be at *least* the specified |
| 1039 | value but may be more. If movablecore on its own |
| 1040 | is specified, the administrator must be careful |
| 1041 | that the amount of memory usable for all allocations |
| 1042 | is not too small. |
| 1043 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1044 | keepinitrd [HW,ARM] |
| 1045 | |
Alan Cox | cd4f0ef | 2007-07-31 00:37:59 -0700 | [diff] [blame] | 1046 | kstack=N [X86-32,X86-64] Print N words from the kernel stack |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1047 | in oops dumps. |
| 1048 | |
Jason Wessel | 6cdf6e0 | 2008-04-17 20:05:38 +0200 | [diff] [blame] | 1049 | kgdboc= [HW] kgdb over consoles. |
| 1050 | Requires a tty driver that supports console polling. |
| 1051 | (only serial suported for now) |
| 1052 | Format: <serial_device>[,baud] |
| 1053 | |
Florian Fainelli | 9bed90c6 | 2008-08-23 18:54:37 +0200 | [diff] [blame] | 1054 | kmac= [MIPS] korina ethernet MAC address. |
| 1055 | Configure the RouterBoard 532 series on-chip |
| 1056 | Ethernet adapter MAC address. |
| 1057 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1058 | l2cr= [PPC] |
| 1059 | |
Robert Brose | a78bfbf | 2008-03-29 07:20:23 +1100 | [diff] [blame] | 1060 | l3cr= [PPC] |
| 1061 | |
Alan Cox | cd4f0ef | 2007-07-31 00:37:59 -0700 | [diff] [blame] | 1062 | lapic [X86-32,APIC] Enable the local APIC even if BIOS |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 1063 | disabled it. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1064 | |
Alan Cox | cd4f0ef | 2007-07-31 00:37:59 -0700 | [diff] [blame] | 1065 | lapic_timer_c2_ok [X86-32,x86-64,APIC] trust the local apic timer in |
Thomas Gleixner | e585bef | 2007-03-23 16:08:01 +0100 | [diff] [blame] | 1066 | C2 power state. |
| 1067 | |
FD Cami | fcb71f6 | 2008-01-06 19:08:56 +0100 | [diff] [blame] | 1068 | libata.dma= [LIBATA] DMA control |
| 1069 | libata.dma=0 Disable all PATA and SATA DMA |
| 1070 | libata.dma=1 PATA and SATA Disk DMA only |
| 1071 | libata.dma=2 ATAPI (CDROM) DMA only |
| 1072 | libata.dma=4 Compact Flash DMA only |
| 1073 | Combinations also work, so libata.dma=3 enables DMA |
| 1074 | for disks and CDROMs, but not CFs. |
| 1075 | |
Dave Jones | 78e70c2 | 2007-09-27 11:50:13 -0400 | [diff] [blame] | 1076 | libata.noacpi [LIBATA] Disables use of ACPI in libata suspend/resume |
| 1077 | when set. |
| 1078 | Format: <int> |
| 1079 | |
Tejun Heo | 3326732 | 2008-02-13 09:15:09 +0900 | [diff] [blame] | 1080 | libata.force= [LIBATA] Force configurations. The format is comma |
| 1081 | separated list of "[ID:]VAL" where ID is |
| 1082 | PORT[:DEVICE]. PORT and DEVICE are decimal numbers |
| 1083 | matching port, link or device. Basically, it matches |
| 1084 | the ATA ID string printed on console by libata. If |
| 1085 | the whole ID part is omitted, the last PORT and DEVICE |
| 1086 | values are used. If ID hasn't been specified yet, the |
| 1087 | configuration applies to all ports, links and devices. |
| 1088 | |
| 1089 | If only DEVICE is omitted, the parameter applies to |
| 1090 | the port and all links and devices behind it. DEVICE |
| 1091 | number of 0 either selects the first device or the |
| 1092 | first fan-out link behind PMP device. It does not |
| 1093 | select the host link. DEVICE number of 15 selects the |
| 1094 | host link and device attached to it. |
| 1095 | |
| 1096 | The VAL specifies the configuration to force. As long |
| 1097 | as there's no ambiguity shortcut notation is allowed. |
| 1098 | For example, both 1.5 and 1.5G would work for 1.5Gbps. |
| 1099 | The following configurations can be forced. |
| 1100 | |
| 1101 | * Cable type: 40c, 80c, short40c, unk, ign or sata. |
| 1102 | Any ID with matching PORT is used. |
| 1103 | |
| 1104 | * SATA link speed limit: 1.5Gbps or 3.0Gbps. |
| 1105 | |
| 1106 | * Transfer mode: pio[0-7], mwdma[0-4] and udma[0-7]. |
| 1107 | udma[/][16,25,33,44,66,100,133] notation is also |
| 1108 | allowed. |
| 1109 | |
| 1110 | * [no]ncq: Turn on or off NCQ. |
| 1111 | |
Tejun Heo | 05944bd | 2008-08-13 20:19:09 +0900 | [diff] [blame] | 1112 | * nohrst, nosrst, norst: suppress hard, soft |
| 1113 | and both resets. |
| 1114 | |
Tejun Heo | 3326732 | 2008-02-13 09:15:09 +0900 | [diff] [blame] | 1115 | If there are multiple matching configurations changing |
| 1116 | the same attribute, the last one is used. |
| 1117 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1118 | load_ramdisk= [RAM] List of ramdisks to load from floppy |
| 1119 | See Documentation/ramdisk.txt. |
| 1120 | |
Randy Dunlap | a6b25b6 | 2006-01-14 13:21:19 -0800 | [diff] [blame] | 1121 | lockd.nlm_grace_period=P [NFS] Assign grace period. |
| 1122 | Format: <integer> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1123 | |
Randy Dunlap | a6b25b6 | 2006-01-14 13:21:19 -0800 | [diff] [blame] | 1124 | lockd.nlm_tcpport=N [NFS] Assign TCP port. |
| 1125 | Format: <integer> |
| 1126 | |
| 1127 | lockd.nlm_timeout=T [NFS] Assign timeout value. |
| 1128 | Format: <integer> |
| 1129 | |
| 1130 | lockd.nlm_udpport=M [NFS] Assign UDP port. |
| 1131 | Format: <integer> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1132 | |
| 1133 | logibm.irq= [HW,MOUSE] Logitech Bus Mouse Driver |
| 1134 | Format: <irq> |
| 1135 | |
| 1136 | loglevel= All Kernel Messages with a loglevel smaller than the |
| 1137 | console loglevel will be printed to the console. It can |
| 1138 | also be changed with klogd or other programs. The |
| 1139 | loglevels are defined as follows: |
| 1140 | |
| 1141 | 0 (KERN_EMERG) system is unusable |
| 1142 | 1 (KERN_ALERT) action must be taken immediately |
| 1143 | 2 (KERN_CRIT) critical conditions |
| 1144 | 3 (KERN_ERR) error conditions |
| 1145 | 4 (KERN_WARNING) warning conditions |
| 1146 | 5 (KERN_NOTICE) normal but significant condition |
| 1147 | 6 (KERN_INFO) informational |
| 1148 | 7 (KERN_DEBUG) debug-level messages |
| 1149 | |
| 1150 | log_buf_len=n Sets the size of the printk ring buffer, in bytes. |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 1151 | Format: { n | nk | nM } |
| 1152 | n must be a power of two. The default size |
| 1153 | is set in the kernel config file. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1154 | |
Randy Dunlap | accaa24 | 2007-10-16 01:29:37 -0700 | [diff] [blame] | 1155 | logo.nologo [FB] Disables display of the built-in Linux logo. |
| 1156 | This may be used to provide more screen space for |
| 1157 | kernel log messages and is useful when debugging |
| 1158 | kernel boot problems. |
| 1159 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1160 | lp=0 [LP] Specify parallel ports to use, e.g, |
| 1161 | lp=port[,port...] lp=none,parport0 (lp0 not configured, lp1 uses |
| 1162 | lp=reset first parallel port). 'lp=0' disables the |
| 1163 | lp=auto printer driver. 'lp=reset' (which can be |
| 1164 | specified in addition to the ports) causes |
| 1165 | attached printers to be reset. Using |
| 1166 | lp=port1,port2,... specifies the parallel ports |
| 1167 | to associate lp devices with, starting with |
| 1168 | lp0. A port specification may be 'none' to skip |
| 1169 | that lp device, or a parport name such as |
| 1170 | 'parport0'. Specifying 'lp=auto' instead of a |
| 1171 | port specification list means that device IDs |
| 1172 | from each port should be examined, to see if |
| 1173 | an IEEE 1284-compliant printer is attached; if |
| 1174 | so, the driver will manage that printer. |
| 1175 | See also header of drivers/char/lp.c. |
| 1176 | |
| 1177 | lpj=n [KNL] |
| 1178 | Sets loops_per_jiffy to given constant, thus avoiding |
| 1179 | time-consuming boot-time autodetection (up to 250 ms per |
| 1180 | CPU). 0 enables autodetection (default). To determine |
| 1181 | the correct value for your kernel, boot with normal |
| 1182 | autodetection and see what value is printed. Note that |
| 1183 | on SMP systems the preset will be applied to all CPUs, |
| 1184 | which is likely to cause problems if your CPUs need |
| 1185 | significantly divergent settings. An incorrect value |
| 1186 | will cause delays in the kernel to be wrong, leading to |
| 1187 | unpredictable I/O errors and other breakage. Although |
| 1188 | unlikely, in the extreme case this might damage your |
| 1189 | hardware. |
| 1190 | |
| 1191 | ltpc= [NET] |
| 1192 | Format: <io>,<irq>,<dma> |
| 1193 | |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 1194 | mac5380= [HW,SCSI] Format: |
| 1195 | <can_queue>,<cmd_per_lun>,<sg_tablesize>,<hostid>,<use_tags> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1196 | |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 1197 | machvec= [IA64] Force the use of a particular machine-vector |
| 1198 | (machvec) in a generic kernel. |
| 1199 | Example: machvec=hpzx1_swiotlb |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1200 | |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 1201 | max_loop= [LOOP] Maximum number of loopback devices that can |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1202 | be mounted |
| 1203 | Format: <1-256> |
| 1204 | |
| 1205 | maxcpus= [SMP] Maximum number of processors that an SMP kernel |
Len Brown | 61ec756 | 2007-08-16 03:34:22 -0400 | [diff] [blame] | 1206 | should make use of. maxcpus=n : n >= 0 limits the |
| 1207 | kernel to using 'n' processors. n=0 is a special case, |
| 1208 | it is equivalent to "nosmp", which also disables |
| 1209 | the IO APIC. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1210 | |
Bob Picco | 2b2c375 | 2005-06-29 18:00:00 -0700 | [diff] [blame] | 1211 | max_addr=[KMG] [KNL,BOOT,ia64] All physical memory greater than or |
| 1212 | equal to this physical address is ignored. |
| 1213 | |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 1214 | max_luns= [SCSI] Maximum number of LUNs to probe. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1215 | Should be between 1 and 2^32-1. |
| 1216 | |
| 1217 | max_report_luns= |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 1218 | [SCSI] Maximum number of LUNs received. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1219 | Should be between 1 and 16384. |
| 1220 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1221 | mcatest= [IA-64] |
| 1222 | |
Alan Cox | cd4f0ef | 2007-07-31 00:37:59 -0700 | [diff] [blame] | 1223 | mce [X86-32] Machine Check Exception |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1224 | |
Uwe Hermann | 71cced6 | 2008-10-20 09:32:21 -0700 | [diff] [blame] | 1225 | mce=option [X86-64] See Documentation/x86/x86_64/boot-options.txt |
Andi Kleen | 909dd32 | 2007-10-17 18:04:38 +0200 | [diff] [blame] | 1226 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1227 | md= [HW] RAID subsystems devices and level |
| 1228 | See Documentation/md.txt. |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 1229 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1230 | mdacon= [MDA] |
| 1231 | Format: <first>,<last> |
| 1232 | Specifies range of consoles to be captured by the MDA. |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 1233 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1234 | mem=nn[KMG] [KNL,BOOT] Force usage of a specific amount of memory |
| 1235 | Amount of memory to be used when the kernel is not able |
| 1236 | to see the whole system memory or for test. |
Alan Cox | cd4f0ef | 2007-07-31 00:37:59 -0700 | [diff] [blame] | 1237 | [X86-32] Use together with memmap= to avoid physical |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1238 | address space collisions. Without memmap= PCI devices |
| 1239 | could be placed at addresses belonging to unused RAM. |
| 1240 | |
Alan Cox | cd4f0ef | 2007-07-31 00:37:59 -0700 | [diff] [blame] | 1241 | mem=nopentium [BUGS=X86-32] Disable usage of 4MB pages for kernel |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1242 | memory. |
| 1243 | |
Paul Mundt | 6902aa8 | 2008-09-21 17:14:42 +0900 | [diff] [blame] | 1244 | memchunk=nn[KMG] |
| 1245 | [KNL,SH] Allow user to override the default size for |
| 1246 | per-device physically contiguous DMA buffers. |
| 1247 | |
Alan Cox | cd4f0ef | 2007-07-31 00:37:59 -0700 | [diff] [blame] | 1248 | memmap=exactmap [KNL,X86-32,X86_64] Enable setting of an exact |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1249 | E820 memory map, as specified by the user. |
| 1250 | Such memmap=exactmap lines can be constructed based on |
| 1251 | BIOS output or other requirements. See the memmap=nn@ss |
| 1252 | option description. |
| 1253 | |
| 1254 | memmap=nn[KMG]@ss[KMG] |
| 1255 | [KNL] Force usage of a specific region of memory |
| 1256 | Region of memory to be used, from ss to ss+nn. |
| 1257 | |
| 1258 | memmap=nn[KMG]#ss[KMG] |
| 1259 | [KNL,ACPI] Mark specific memory as ACPI data. |
| 1260 | Region of memory to be used, from ss to ss+nn. |
| 1261 | |
| 1262 | memmap=nn[KMG]$ss[KMG] |
| 1263 | [KNL,ACPI] Mark specific memory as reserved. |
| 1264 | Region of memory to be used, from ss to ss+nn. |
Pavel Machek | 1312848 | 2008-03-24 12:29:43 -0700 | [diff] [blame] | 1265 | Example: Exclude memory from 0x18690000-0x1869ffff |
| 1266 | memmap=64K$0x18690000 |
| 1267 | or |
| 1268 | memmap=0x10000$0x18690000 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1269 | |
Jeremy Fitzhardinge | 9f07787 | 2008-09-07 01:51:34 -0700 | [diff] [blame] | 1270 | memory_corruption_check=0/1 [X86] |
| 1271 | Some BIOSes seem to corrupt the first 64k of |
| 1272 | memory when doing things like suspend/resume. |
| 1273 | Setting this option will scan the memory |
| 1274 | looking for corruption. Enabling this will |
| 1275 | both detect corruption and prevent the kernel |
| 1276 | from using the memory being corrupted. |
| 1277 | However, its intended as a diagnostic tool; if |
| 1278 | repeatable BIOS-originated corruption always |
| 1279 | affects the same memory, you can use memmap= |
| 1280 | to prevent the kernel from using that memory. |
| 1281 | |
| 1282 | memory_corruption_check_size=size [X86] |
| 1283 | By default it checks for corruption in the low |
| 1284 | 64k, making this memory unavailable for normal |
| 1285 | use. Use this parameter to scan for |
| 1286 | corruption in more or less memory. |
| 1287 | |
| 1288 | memory_corruption_check_period=seconds [X86] |
| 1289 | By default it checks for corruption every 60 |
| 1290 | seconds. Use this parameter to check at some |
| 1291 | other rate. 0 disables periodic checking. |
| 1292 | |
Yinghai Lu | caadbdc | 2008-07-15 00:03:44 -0700 | [diff] [blame] | 1293 | memtest= [KNL,X86] Enable memtest |
Yinghai Lu | c64df70 | 2008-03-21 18:56:19 -0700 | [diff] [blame] | 1294 | Format: <integer> |
| 1295 | range: 0,4 : pattern number |
| 1296 | default : 0 <disable> |
| 1297 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1298 | meye.*= [HW] Set MotionEye Camera parameters |
| 1299 | See Documentation/video4linux/meye.txt. |
| 1300 | |
Andres Salomon | 8f36881 | 2007-10-12 23:04:06 +0200 | [diff] [blame] | 1301 | mfgpt_irq= [IA-32] Specify the IRQ to use for the |
| 1302 | Multi-Function General Purpose Timers on AMD Geode |
| 1303 | platforms. |
| 1304 | |
Willy Tarreau | e6c4dc6 | 2008-01-30 13:33:33 +0100 | [diff] [blame] | 1305 | mfgptfix [X86-32] Fix MFGPT timers on AMD Geode platforms when |
| 1306 | the BIOS has incorrectly applied a workaround. TinyBIOS |
| 1307 | version 0.98 is known to be affected, 0.99 fixes the |
| 1308 | problem by letting the user disable the workaround. |
| 1309 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1310 | mga= [HW,DRM] |
| 1311 | |
Mel Gorman | 6b74ab9 | 2008-07-23 21:26:49 -0700 | [diff] [blame] | 1312 | mminit_loglevel= |
| 1313 | [KNL] When CONFIG_DEBUG_MEMORY_INIT is set, this |
| 1314 | parameter allows control of the logging verbosity for |
| 1315 | the additional memory initialisation checks. A value |
| 1316 | of 0 disables mminit logging and a level of 4 will |
| 1317 | log everything. Information is printed at KERN_DEBUG |
| 1318 | so loglevel=8 may also need to be specified. |
| 1319 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1320 | mousedev.tap_time= |
| 1321 | [MOUSE] Maximum time between finger touching and |
| 1322 | leaving touchpad surface for touch to be considered |
| 1323 | a tap and be reported as a left button click (for |
| 1324 | touchpads working in absolute mode only). |
| 1325 | Format: <msecs> |
| 1326 | mousedev.xres= [MOUSE] Horizontal screen resolution, used for devices |
| 1327 | reporting absolute coordinates, such as tablets |
| 1328 | mousedev.yres= [MOUSE] Vertical screen resolution, used for devices |
| 1329 | reporting absolute coordinates, such as tablets |
| 1330 | |
| 1331 | mpu401= [HW,OSS] |
| 1332 | Format: <io>,<irq> |
| 1333 | |
| 1334 | MTD_Partition= [MTD] |
| 1335 | Format: <name>,<region-number>,<size>,<offset> |
| 1336 | |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 1337 | MTD_Region= [MTD] Format: |
| 1338 | <name>,<region-number>[,<base>,<size>,<buswidth>,<altbuswidth>] |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1339 | |
| 1340 | mtdparts= [MTD] |
Randy Dunlap | c8facbb | 2007-07-31 00:37:40 -0700 | [diff] [blame] | 1341 | See drivers/mtd/cmdlinepart.c. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1342 | |
Ben Dooks | 9db829f | 2008-07-03 11:24:29 +0100 | [diff] [blame] | 1343 | mtdset= [ARM] |
| 1344 | ARM/S3C2412 JIVE boot control |
| 1345 | |
| 1346 | See arch/arm/mach-s3c2412/mach-jive.c |
| 1347 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1348 | mtouchusb.raw_coordinates= |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 1349 | [HW] Make the MicroTouch USB driver use raw coordinates |
| 1350 | ('y', default) or cooked coordinates ('n') |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1351 | |
| 1352 | n2= [NET] SDL Inc. RISCom/N2 synchronous serial card |
| 1353 | |
| 1354 | NCR_D700= [HW,SCSI] |
| 1355 | See header of drivers/scsi/NCR_D700.c. |
| 1356 | |
| 1357 | ncr5380= [HW,SCSI] |
| 1358 | |
| 1359 | ncr53c400= [HW,SCSI] |
| 1360 | |
| 1361 | ncr53c400a= [HW,SCSI] |
| 1362 | |
| 1363 | ncr53c406a= [HW,SCSI] |
| 1364 | |
| 1365 | ncr53c8xx= [HW,SCSI] |
| 1366 | |
| 1367 | netdev= [NET] Network devices parameters |
| 1368 | Format: <irq>,<io>,<mem_start>,<mem_end>,<name> |
| 1369 | Note that mem_start is often overloaded to mean |
| 1370 | something different and driver-specific. |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 1371 | This usage is only documented in each driver source |
| 1372 | file if at all. |
| 1373 | |
Krzysztof Piotr Oledzki | 5840157 | 2008-07-21 10:01:34 -0700 | [diff] [blame] | 1374 | nf_conntrack.acct= |
| 1375 | [NETFILTER] Enable connection tracking flow accounting |
| 1376 | 0 to disable accounting |
| 1377 | 1 to enable accounting |
| 1378 | Default value depends on CONFIG_NF_CT_ACCT that is |
| 1379 | going to be removed in 2.6.29. |
| 1380 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1381 | nfsaddrs= [NFS] |
J. Bruce Fields | 6ded55d | 2008-04-07 15:59:03 -0400 | [diff] [blame] | 1382 | See Documentation/filesystems/nfsroot.txt. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1383 | |
| 1384 | nfsroot= [NFS] nfs root filesystem for disk-less boxes. |
J. Bruce Fields | 6ded55d | 2008-04-07 15:59:03 -0400 | [diff] [blame] | 1385 | See Documentation/filesystems/nfsroot.txt. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1386 | |
Trond Myklebust | a72b442 | 2006-01-03 09:55:41 +0100 | [diff] [blame] | 1387 | nfs.callback_tcpport= |
| 1388 | [NFS] set the TCP port on which the NFSv4 callback |
| 1389 | channel should listen. |
| 1390 | |
Trond Myklebust | 58df095 | 2006-01-03 09:55:57 +0100 | [diff] [blame] | 1391 | nfs.idmap_cache_timeout= |
| 1392 | [NFS] set the maximum lifetime for idmapper cache |
| 1393 | entries. |
| 1394 | |
Trond Myklebust | f43bf0b | 2007-10-09 12:01:04 -0400 | [diff] [blame] | 1395 | nfs.enable_ino64= |
| 1396 | [NFS] enable 64-bit inode numbers. |
| 1397 | If zero, the NFS client will fake up a 32-bit inode |
| 1398 | number for the readdir() and stat() syscalls instead |
| 1399 | of returning the full 64-bit number. |
| 1400 | The default is to return 64-bit inode numbers. |
| 1401 | |
Haavard Skinnemoen | e7ba176 | 2007-10-10 14:58:29 +0200 | [diff] [blame] | 1402 | nmi_debug= [KNL,AVR32] Specify one or more actions to take |
| 1403 | when a NMI is triggered. |
| 1404 | Format: [state][,regs][,debounce][,die] |
| 1405 | |
Alan Cox | cd4f0ef | 2007-07-31 00:37:59 -0700 | [diff] [blame] | 1406 | nmi_watchdog= [KNL,BUGS=X86-32] Debugging features for SMP kernels |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1407 | |
Alan Cox | cd4f0ef | 2007-07-31 00:37:59 -0700 | [diff] [blame] | 1408 | no387 [BUGS=X86-32] Tells the kernel to use the 387 maths |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1409 | emulation library even if a 387 maths coprocessor |
| 1410 | is present. |
| 1411 | |
Christoph Lameter | c1aee21 | 2007-05-31 00:40:47 -0700 | [diff] [blame] | 1412 | noaliencache [MM, NUMA, SLAB] Disables the allocation of alien |
| 1413 | caches in the slab allocator. Saves per-node memory, |
| 1414 | but will impact performance. |
Paul Menage | 3395ee0 | 2006-12-06 20:32:16 -0800 | [diff] [blame] | 1415 | |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 1416 | noalign [KNL,ARM] |
| 1417 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1418 | noapic [SMP,APIC] Tells the kernel to not make use of any |
| 1419 | IOAPICs that may be present in the system. |
| 1420 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1421 | nobats [PPC] Do not use BATs for mapping kernel lowmem |
| 1422 | on "Classic" PPC cores. |
| 1423 | |
| 1424 | nocache [ARM] |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 1425 | |
Shailabh Nagar | 163ecdf | 2006-07-30 03:03:11 -0700 | [diff] [blame] | 1426 | nodelayacct [KNL] Disable per-task delay accounting |
| 1427 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1428 | nodisconnect [HW,SCSI,M68K] Disables SCSI disconnects. |
| 1429 | |
Paul Mundt | 6902aa8 | 2008-09-21 17:14:42 +0900 | [diff] [blame] | 1430 | nodsp [SH] Disable hardware DSP at boot time. |
| 1431 | |
Huang, Ying | 8b2cb7a | 2008-01-30 13:32:11 +0100 | [diff] [blame] | 1432 | noefi [X86-32,X86-64] Disable EFI runtime services support. |
| 1433 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1434 | noexec [IA-64] |
| 1435 | |
Alan Cox | cd4f0ef | 2007-07-31 00:37:59 -0700 | [diff] [blame] | 1436 | noexec [X86-32,X86-64] |
Jiri Slaby | f5a1b19 | 2008-04-12 10:28:25 +0200 | [diff] [blame] | 1437 | On X86-32 available only on PAE configured kernels. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1438 | noexec=on: enable non-executable mappings (default) |
Jiri Slaby | f5a1b19 | 2008-04-12 10:28:25 +0200 | [diff] [blame] | 1439 | noexec=off: disable non-executable mappings |
| 1440 | |
| 1441 | noexec32 [X86-64] |
| 1442 | This affects only 32-bit executables. |
| 1443 | noexec32=on: enable non-executable mappings (default) |
| 1444 | read doesn't imply executable mappings |
| 1445 | noexec32=off: disable non-executable mappings |
| 1446 | read implies executable mappings |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1447 | |
Paul Mundt | 6902aa8 | 2008-09-21 17:14:42 +0900 | [diff] [blame] | 1448 | nofpu [SH] Disable hardware FPU at boot time. |
| 1449 | |
Alan Cox | cd4f0ef | 2007-07-31 00:37:59 -0700 | [diff] [blame] | 1450 | nofxsr [BUGS=X86-32] Disables x86 floating point extended |
Chuck Ebbert | 4f88651 | 2006-03-23 02:59:34 -0800 | [diff] [blame] | 1451 | register save and restore. The kernel will only save |
| 1452 | legacy floating-point registers on task switch. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1453 | |
Andi Kleen | 191679f | 2008-01-30 13:33:21 +0100 | [diff] [blame] | 1454 | noclflush [BUGS=X86] Don't use the CLFLUSH instruction |
| 1455 | |
Paul Mundt | 6902aa8 | 2008-09-21 17:14:42 +0900 | [diff] [blame] | 1456 | nohlt [BUGS=ARM,SH] |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 1457 | |
Alan Cox | cd4f0ef | 2007-07-31 00:37:59 -0700 | [diff] [blame] | 1458 | no-hlt [BUGS=X86-32] Tells the kernel that the hlt |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1459 | instruction doesn't work correctly and not to |
| 1460 | use it. |
| 1461 | |
| 1462 | nohalt [IA-64] Tells the kernel not to use the power saving |
| 1463 | function PAL_HALT_LIGHT when idle. This increases |
| 1464 | power-consumption. On the positive side, it reduces |
| 1465 | interrupt wake-up latency, which may improve performance |
| 1466 | in certain environments such as networked servers or |
| 1467 | real-time systems. |
| 1468 | |
Thomas Gleixner | 79bf2bb | 2007-02-16 01:28:03 -0800 | [diff] [blame] | 1469 | nohz= [KNL] Boottime enable/disable dynamic ticks |
| 1470 | Valid arguments: on, off |
| 1471 | Default: on |
| 1472 | |
Alan Cox | cd4f0ef | 2007-07-31 00:37:59 -0700 | [diff] [blame] | 1473 | noirqbalance [X86-32,SMP,KNL] Disable kernel irq balancing |
Zachary Amsden | 8542b20 | 2006-12-07 02:14:09 +0100 | [diff] [blame] | 1474 | |
Alan Cox | cd4f0ef | 2007-07-31 00:37:59 -0700 | [diff] [blame] | 1475 | noirqdebug [X86-32] Disables the code which attempts to detect and |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1476 | disable unhandled interrupt sources. |
| 1477 | |
Alan Cox | cd4f0ef | 2007-07-31 00:37:59 -0700 | [diff] [blame] | 1478 | no_timer_check [X86-32,X86_64,APIC] Disables the code which tests for |
Zachary Amsden | 8542b20 | 2006-12-07 02:14:09 +0100 | [diff] [blame] | 1479 | broken timer IRQ sources. |
| 1480 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1481 | noisapnp [ISAPNP] Disables ISA PnP code. |
| 1482 | |
| 1483 | noinitrd [RAM] Tells the kernel not to load any configured |
| 1484 | initial RAM disk. |
| 1485 | |
| 1486 | nointroute [IA-64] |
| 1487 | |
Tony Luck | 0aa366f | 2007-07-20 11:22:30 -0700 | [diff] [blame] | 1488 | nojitter [IA64] Disables jitter checking for ITC timers. |
| 1489 | |
Alan Cox | cd4f0ef | 2007-07-31 00:37:59 -0700 | [diff] [blame] | 1490 | nolapic [X86-32,APIC] Do not enable or use the local APIC. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1491 | |
Alan Cox | cd4f0ef | 2007-07-31 00:37:59 -0700 | [diff] [blame] | 1492 | nolapic_timer [X86-32,APIC] Do not use the local APIC timer. |
Thomas Gleixner | ad62ca2 | 2007-03-22 00:11:21 -0800 | [diff] [blame] | 1493 | |
Suresh Siddha | 6e1cb38 | 2008-07-10 11:16:58 -0700 | [diff] [blame] | 1494 | nox2apic [X86-64,APIC] Do not enable x2APIC mode. |
| 1495 | |
Suresh Siddha | af9d138 | 2008-07-11 13:11:57 -0700 | [diff] [blame] | 1496 | x2apic_phys [X86-64,APIC] Use x2apic physical mode instead of |
| 1497 | default x2apic cluster mode on platforms |
| 1498 | supporting x2apic. |
| 1499 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1500 | noltlbs [PPC] Do not use large page/tlb entries for kernel |
| 1501 | lowmem mapping on PPC40x. |
| 1502 | |
Horms | 312f1f0 | 2006-02-22 09:57:55 +0900 | [diff] [blame] | 1503 | nomca [IA-64] Disable machine check abort handling |
| 1504 | |
Alan Cox | cd4f0ef | 2007-07-31 00:37:59 -0700 | [diff] [blame] | 1505 | nomce [X86-32] Machine Check Exception |
Horms | abe37e5 | 2006-04-01 01:36:09 +0200 | [diff] [blame] | 1506 | |
Andres Salomon | 83d7384 | 2007-10-12 23:04:06 +0200 | [diff] [blame] | 1507 | nomfgpt [X86-32] Disable Multi-Function General Purpose |
| 1508 | Timer usage (for AMD Geode machines). |
| 1509 | |
Alan Cox | cd4f0ef | 2007-07-31 00:37:59 -0700 | [diff] [blame] | 1510 | noreplace-paravirt [X86-32,PV_OPS] Don't patch paravirt_ops |
Jeremy Fitzhardinge | 959b4fd | 2007-05-02 19:27:16 +0200 | [diff] [blame] | 1511 | |
Alan Cox | cd4f0ef | 2007-07-31 00:37:59 -0700 | [diff] [blame] | 1512 | noreplace-smp [X86-32,SMP] Don't replace SMP instructions |
Jeremy Fitzhardinge | b7fb4af | 2007-05-02 19:27:13 +0200 | [diff] [blame] | 1513 | with UP alternatives |
| 1514 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1515 | noresidual [PPC] Don't use residual data on PReP machines. |
| 1516 | |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 1517 | noresume [SWSUSP] Disables resume and restores original swap |
| 1518 | space. |
| 1519 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1520 | no-scroll [VGA] Disables scrollback. |
| 1521 | This is required for the Braillex ib80-piezo Braille |
| 1522 | reader made by F.H. Papenmeier (Germany). |
| 1523 | |
| 1524 | nosbagart [IA-64] |
| 1525 | |
Alan Cox | cd4f0ef | 2007-07-31 00:37:59 -0700 | [diff] [blame] | 1526 | nosep [BUGS=X86-32] Disables x86 SYSENTER/SYSEXIT support. |
Chuck Ebbert | 4f88651 | 2006-03-23 02:59:34 -0800 | [diff] [blame] | 1527 | |
Len Brown | 61ec756 | 2007-08-16 03:34:22 -0400 | [diff] [blame] | 1528 | nosmp [SMP] Tells an SMP kernel to act as a UP kernel, |
| 1529 | and disable the IO APIC. legacy for "maxcpus=0". |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1530 | |
Dave Jones | 9784221 | 2007-07-15 23:41:05 -0700 | [diff] [blame] | 1531 | nosoftlockup [KNL] Disable the soft-lockup detector. |
| 1532 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1533 | nosync [HW,M68K] Disables sync negotiation for all devices. |
| 1534 | |
Alan Cox | cd4f0ef | 2007-07-31 00:37:59 -0700 | [diff] [blame] | 1535 | notsc [BUGS=X86-32] Disable Time Stamp Counter |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1536 | |
| 1537 | nousb [USB] Disable the USB subsystem |
| 1538 | |
| 1539 | nowb [ARM] |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 1540 | |
Fenghua Yu | a6c75b86 | 2008-03-14 13:57:08 -0700 | [diff] [blame] | 1541 | nptcg= [IA64] Override max number of concurrent global TLB |
| 1542 | purges which is reported from either PAL_VM_SUMMARY or |
| 1543 | SAL PALO. |
| 1544 | |
KAMEZAWA Hiroyuki | f0c0b2b | 2007-07-15 23:38:01 -0700 | [diff] [blame] | 1545 | numa_zonelist_order= [KNL, BOOT] Select zonelist order for NUMA. |
| 1546 | one of ['zone', 'node', 'default'] can be specified |
| 1547 | This can be set from sysctl after boot. |
| 1548 | See Documentation/sysctl/vm.txt for details. |
| 1549 | |
Dave Jones | a61c2d7 | 2006-01-07 23:18:19 +0000 | [diff] [blame] | 1550 | nr_uarts= [SERIAL] maximum number of UARTs to be registered. |
| 1551 | |
Andres Salomon | 3ef0e1f | 2008-04-29 00:59:53 -0700 | [diff] [blame] | 1552 | olpc_ec_timeout= [OLPC] ms delay when issuing EC commands |
| 1553 | Rather than timing out after 20 ms if an EC |
| 1554 | command is not properly ACKed, override the length |
| 1555 | of the timeout. We have interrupts disabled while |
| 1556 | waiting for the ACK, so if this is set too high |
| 1557 | interrupts *may* be lost! |
| 1558 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1559 | opl3= [HW,OSS] |
| 1560 | Format: <io> |
| 1561 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1562 | oprofile.timer= [HW] |
| 1563 | Use timer interrupt instead of performance counters |
| 1564 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1565 | osst= [HW,SCSI] SCSI Tape Driver |
| 1566 | Format: <buffer_size>,<write_threshold> |
| 1567 | See also Documentation/scsi/st.txt. |
| 1568 | |
| 1569 | panic= [KNL] Kernel behaviour on panic |
| 1570 | Format: <timeout> |
| 1571 | |
| 1572 | parkbd.port= [HW] Parallel port number the keyboard adapter is |
| 1573 | connected to, default is 0. |
| 1574 | Format: <parport#> |
| 1575 | parkbd.mode= [HW] Parallel port keyboard adapter mode of operation, |
| 1576 | 0 for XT, 1 for AT (default is AT). |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 1577 | Format: <mode> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1578 | |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 1579 | parport= [HW,PPT] Specify parallel ports. 0 disables. |
| 1580 | Format: { 0 | auto | 0xBBB[,IRQ[,DMA]] } |
| 1581 | Use 'auto' to force the driver to use any |
| 1582 | IRQ/DMA settings detected (the default is to |
| 1583 | ignore detected IRQ/DMA settings because of |
| 1584 | possible conflicts). You can specify the base |
| 1585 | address, IRQ, and DMA settings; IRQ and DMA |
| 1586 | should be numbers, or 'auto' (for using detected |
| 1587 | settings on that particular port), or 'nofifo' |
| 1588 | (to avoid using a FIFO even if it is detected). |
| 1589 | Parallel ports are assigned in the order they |
| 1590 | are specified on the command line, starting |
| 1591 | with parport0. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1592 | |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 1593 | parport_init_mode= [HW,PPT] |
| 1594 | Configure VIA parallel port to operate in |
| 1595 | a specific mode. This is necessary on Pegasos |
| 1596 | computer where firmware has no options for setting |
| 1597 | up parallel port mode and sets it to spp. |
| 1598 | Currently this function knows 686a and 8231 chips. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1599 | Format: [spp|ps2|epp|ecp|ecpepp] |
| 1600 | |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 1601 | pas2= [HW,OSS] Format: |
| 1602 | <io>,<irq>,<dma>,<dma16>,<sb_io>,<sb_irq>,<sb_dma>,<sb_dma16> |
| 1603 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1604 | pas16= [HW,SCSI] |
| 1605 | See header of drivers/scsi/pas16.c. |
| 1606 | |
Andrew Morton | dd28779 | 2006-03-23 03:00:57 -0800 | [diff] [blame] | 1607 | pause_on_oops= |
| 1608 | Halt all CPUs after the first oops has been printed for |
| 1609 | the specified number of seconds. This is to be used if |
| 1610 | your oopses keep scrolling off the screen. |
| 1611 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1612 | pcbit= [HW,ISDN] |
| 1613 | |
| 1614 | pcd. [PARIDE] |
| 1615 | See header of drivers/block/paride/pcd.c. |
| 1616 | See also Documentation/paride.txt. |
| 1617 | |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 1618 | pci=option[,option...] [PCI] various PCI subsystem options: |
Andi Kleen | c011560 | 2008-08-22 09:53:39 +0200 | [diff] [blame] | 1619 | off [X86] don't probe for the PCI bus |
Alan Cox | cd4f0ef | 2007-07-31 00:37:59 -0700 | [diff] [blame] | 1620 | bios [X86-32] force use of PCI BIOS, don't access |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 1621 | the hardware directly. Use this if your machine |
| 1622 | has a non-standard PCI host bridge. |
Alan Cox | cd4f0ef | 2007-07-31 00:37:59 -0700 | [diff] [blame] | 1623 | nobios [X86-32] disallow use of PCI BIOS, only direct |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 1624 | hardware access methods are allowed. Use this |
| 1625 | if you experience crashes upon bootup and you |
| 1626 | suspect they are caused by the BIOS. |
Andi Kleen | c011560 | 2008-08-22 09:53:39 +0200 | [diff] [blame] | 1627 | conf1 [X86] Force use of PCI Configuration |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 1628 | Mechanism 1. |
Andi Kleen | c011560 | 2008-08-22 09:53:39 +0200 | [diff] [blame] | 1629 | conf2 [X86] Force use of PCI Configuration |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 1630 | Mechanism 2. |
Randy Dunlap | 7f78576 | 2007-10-05 13:17:58 -0700 | [diff] [blame] | 1631 | noaer [PCIE] If the PCIEAER kernel config parameter is |
| 1632 | enabled, this kernel boot option can be used to |
| 1633 | disable the use of PCIE advanced error reporting. |
Jeff Garzik | 32a2eea | 2007-10-11 16:57:27 -0400 | [diff] [blame] | 1634 | nodomains [PCI] Disable support for multiple PCI |
| 1635 | root domains (aka PCI segments, in ACPI-speak). |
Alan Cox | cd4f0ef | 2007-07-31 00:37:59 -0700 | [diff] [blame] | 1636 | nommconf [X86-32,X86_64] Disable use of MMCONFIG for PCI |
Bjorn Helgaas | 61be6d6 | 2006-02-15 15:17:43 -0800 | [diff] [blame] | 1637 | Configuration |
Matthew Wilcox | 309e57d | 2006-03-05 22:33:34 -0700 | [diff] [blame] | 1638 | nomsi [MSI] If the PCI_MSI kernel config parameter is |
| 1639 | enabled, this kernel boot option can be used to |
| 1640 | disable the use of MSI interrupts system-wide. |
Alan Cox | cd4f0ef | 2007-07-31 00:37:59 -0700 | [diff] [blame] | 1641 | biosirq [X86-32] Use PCI BIOS calls to get the interrupt |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 1642 | routing table. These calls are known to be buggy |
| 1643 | on several machines and they hang the machine |
| 1644 | when used, but on other computers it's the only |
| 1645 | way to get the interrupt routing table. Try |
| 1646 | this option if the kernel is unable to allocate |
| 1647 | IRQs or discover secondary PCI buses on your |
| 1648 | motherboard. |
Andi Kleen | c011560 | 2008-08-22 09:53:39 +0200 | [diff] [blame] | 1649 | rom [X86] Assign address space to expansion ROMs. |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 1650 | Use with caution as certain devices share |
| 1651 | address decoders between ROMs and other |
| 1652 | resources. |
Andi Kleen | c011560 | 2008-08-22 09:53:39 +0200 | [diff] [blame] | 1653 | norom [X86] Do not assign address space to |
Gary Hade | bb71ad8 | 2008-05-12 13:57:46 -0700 | [diff] [blame] | 1654 | expansion ROMs that do not already have |
| 1655 | BIOS assigned address ranges. |
Andi Kleen | c011560 | 2008-08-22 09:53:39 +0200 | [diff] [blame] | 1656 | irqmask=0xMMMM [X86] Set a bit mask of IRQs allowed to be |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 1657 | assigned automatically to PCI devices. You can |
| 1658 | make the kernel exclude IRQs of your ISA cards |
| 1659 | this way. |
Andi Kleen | c011560 | 2008-08-22 09:53:39 +0200 | [diff] [blame] | 1660 | pirqaddr=0xAAAAA [X86] Specify the physical address |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 1661 | of the PIRQ table (normally generated |
| 1662 | by the BIOS) if it is outside the |
| 1663 | F0000h-100000h range. |
Andi Kleen | c011560 | 2008-08-22 09:53:39 +0200 | [diff] [blame] | 1664 | lastbus=N [X86] Scan all buses thru bus #N. Can be |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 1665 | useful if the kernel is unable to find your |
| 1666 | secondary buses and you want to tell it |
| 1667 | explicitly which ones they are. |
Andi Kleen | c011560 | 2008-08-22 09:53:39 +0200 | [diff] [blame] | 1668 | assign-busses [X86] Always assign all PCI bus |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 1669 | numbers ourselves, overriding |
| 1670 | whatever the firmware may have done. |
Andi Kleen | c011560 | 2008-08-22 09:53:39 +0200 | [diff] [blame] | 1671 | usepirqmask [X86] Honor the possible IRQ mask stored |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 1672 | in the BIOS $PIR table. This is needed on |
| 1673 | some systems with broken BIOSes, notably |
| 1674 | some HP Pavilion N5400 and Omnibook XE3 |
| 1675 | notebooks. This will have no effect if ACPI |
| 1676 | IRQ routing is enabled. |
Andi Kleen | c011560 | 2008-08-22 09:53:39 +0200 | [diff] [blame] | 1677 | noacpi [X86] Do not use ACPI for IRQ routing |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 1678 | or for PCI scanning. |
Andi Kleen | c011560 | 2008-08-22 09:53:39 +0200 | [diff] [blame] | 1679 | use_crs [X86] Use _CRS for PCI resource |
Gary Hade | 62f420f | 2007-10-03 15:56:51 -0700 | [diff] [blame] | 1680 | allocation. |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 1681 | routeirq Do IRQ routing for all PCI devices. |
| 1682 | This is normally done in pci_enable_device(), |
| 1683 | so this option is a temporary workaround |
| 1684 | for broken drivers that don't call it. |
Yinghai Lu | 13a6ddb | 2008-03-27 01:31:18 -0700 | [diff] [blame] | 1685 | skip_isa_align [X86] do not align io start addr, so can |
| 1686 | handle more pci cards |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 1687 | firmware [ARM] Do not re-enumerate the bus but instead |
| 1688 | just use the configuration from the |
| 1689 | bootloader. This is currently used on |
| 1690 | IXP2000 systems where the bus has to be |
| 1691 | configured a certain way for adjunct CPUs. |
Andi Kleen | 0637a70 | 2006-09-26 10:52:41 +0200 | [diff] [blame] | 1692 | noearly [X86] Don't do any early type 1 scanning. |
| 1693 | This might help on some broken boards which |
| 1694 | machine check when some devices' config space |
| 1695 | is read. But various workarounds are disabled |
| 1696 | and some IOMMU drivers will not work. |
Matt Domsch | 6b4b78f | 2006-09-29 15:23:23 -0500 | [diff] [blame] | 1697 | bfsort Sort PCI devices into breadth-first order. |
| 1698 | This sorting is done to get a device |
| 1699 | order compatible with older (<= 2.4) kernels. |
| 1700 | nobfsort Don't sort PCI devices into breadth-first order. |
Atsushi Nemoto | 4516a61 | 2007-02-05 16:36:06 -0800 | [diff] [blame] | 1701 | cbiosize=nn[KMG] The fixed amount of bus space which is |
| 1702 | reserved for the CardBus bridge's IO window. |
| 1703 | The default value is 256 bytes. |
| 1704 | cbmemsize=nn[KMG] The fixed amount of bus space which is |
| 1705 | reserved for the CardBus bridge's memory |
| 1706 | window. The default value is 64 megabytes. |
Matt Domsch | 6b4b78f | 2006-09-29 15:23:23 -0500 | [diff] [blame] | 1707 | |
Chuck Ebbert | e5665a4 | 2008-09-24 20:40:34 -0400 | [diff] [blame] | 1708 | pcie_aspm= [PCIE] Forcibly enable or disable PCIe Active State Power |
| 1709 | Management. |
| 1710 | off Disable ASPM. |
| 1711 | force Enable ASPM even on devices that claim not to support it. |
| 1712 | WARNING: Forcing ASPM on may cause system lockups. |
| 1713 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1714 | pcmv= [HW,PCMCIA] BadgePAD 4 |
| 1715 | |
| 1716 | pd. [PARIDE] |
| 1717 | See Documentation/paride.txt. |
| 1718 | |
| 1719 | pdcchassis= [PARISC,HW] Disable/Enable PDC Chassis Status codes at |
| 1720 | boot time. |
| 1721 | Format: { 0 | 1 } |
| 1722 | See arch/parisc/kernel/pdc_chassis.c |
| 1723 | |
| 1724 | pf. [PARIDE] |
| 1725 | See Documentation/paride.txt. |
| 1726 | |
| 1727 | pg. [PARIDE] |
| 1728 | See Documentation/paride.txt. |
| 1729 | |
| 1730 | pirq= [SMP,APIC] Manual mp-table setup |
Uwe Hermann | 71cced6 | 2008-10-20 09:32:21 -0700 | [diff] [blame] | 1731 | See Documentation/x86/i386/IO-APIC.txt. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1732 | |
| 1733 | plip= [PPT,NET] Parallel port network link |
| 1734 | Format: { parport<nr> | timid | 0 } |
| 1735 | See also Documentation/parport.txt. |
| 1736 | |
Thomas Gleixner | de32a24 | 2008-07-12 05:33:30 +0200 | [diff] [blame] | 1737 | pmtmr= [X86] Manual setup of pmtmr I/O Port. |
| 1738 | Override pmtimer IOPort with a hex value. |
| 1739 | e.g. pmtmr=0x508 |
| 1740 | |
Bjorn Helgaas | 97ef062 | 2008-08-19 16:53:41 -0600 | [diff] [blame] | 1741 | pnp.debug [PNP] |
| 1742 | Enable PNP debug messages. This depends on the |
| 1743 | CONFIG_PNP_DEBUG_MESSAGES option. |
| 1744 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1745 | pnpacpi= [ACPI] |
| 1746 | { off } |
| 1747 | |
| 1748 | pnpbios= [ISAPNP] |
| 1749 | { on | off | curr | res | no-curr | no-res } |
| 1750 | |
| 1751 | pnp_reserve_irq= |
| 1752 | [ISAPNP] Exclude IRQs for the autoconfiguration |
| 1753 | |
| 1754 | pnp_reserve_dma= |
| 1755 | [ISAPNP] Exclude DMAs for the autoconfiguration |
| 1756 | |
| 1757 | pnp_reserve_io= [ISAPNP] Exclude I/O ports for the autoconfiguration |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 1758 | Ranges are in pairs (I/O port base and size). |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1759 | |
| 1760 | pnp_reserve_mem= |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 1761 | [ISAPNP] Exclude memory regions for the |
| 1762 | autoconfiguration. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1763 | Ranges are in pairs (memory base and size). |
| 1764 | |
Jason Baron | 346e15b | 2008-08-12 16:46:19 -0400 | [diff] [blame] | 1765 | dynamic_printk |
| 1766 | Enables pr_debug()/dev_dbg() calls if |
| 1767 | CONFIG_DYNAMIC_PRINTK_DEBUG has been enabled. These can also |
| 1768 | be switched on/off via <debugfs>/dynamic_printk/modules |
| 1769 | |
Ingo Molnar | 45807a1 | 2007-07-15 23:40:10 -0700 | [diff] [blame] | 1770 | print-fatal-signals= |
| 1771 | [KNL] debug: print fatal signals |
| 1772 | print-fatal-signals=1: print segfault info to |
| 1773 | the kernel console. |
| 1774 | default: off. |
| 1775 | |
Randy Dunlap | e84845c | 2007-07-15 23:40:25 -0700 | [diff] [blame] | 1776 | printk.time= Show timing data prefixed to each printk message line |
| 1777 | Format: <bool> (1/Y/y=enable, 0/N/n=disable) |
| 1778 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1779 | profile= [KNL] Enable kernel profiling via /proc/profile |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 1780 | Format: [schedule,]<number> |
| 1781 | Param: "schedule" - profile schedule points. |
| 1782 | Param: <number> - step/bucket size as a power of 2 for |
| 1783 | statistical time based profiling. |
Mel Gorman | b3da2a7 | 2007-10-24 18:23:50 +0200 | [diff] [blame] | 1784 | Param: "sleep" - profile D-state sleeping (millisecs). |
| 1785 | Requires CONFIG_SCHEDSTATS |
Dave Jones | c0fe2e6 | 2007-10-20 03:08:22 +0200 | [diff] [blame] | 1786 | Param: "kvm" - profile VM exits. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1787 | |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 1788 | processor.max_cstate= [HW,ACPI] |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1789 | Limit processor to maximum C-state |
| 1790 | max_cstate=9 overrides any DMI blacklist limit. |
| 1791 | |
Len Brown | 41c0d86 | 2005-12-28 12:43:51 -0500 | [diff] [blame] | 1792 | processor.nocst [HW,ACPI] |
| 1793 | Ignore the _CST method to determine C-states, |
| 1794 | instead using the legacy FADT method |
| 1795 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1796 | prompt_ramdisk= [RAM] List of RAM disks to prompt for floppy disk |
| 1797 | before loading. |
| 1798 | See Documentation/ramdisk.txt. |
| 1799 | |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 1800 | psmouse.proto= [HW,MOUSE] Highest PS2 mouse protocol extension to |
| 1801 | probe for; one of (bare|imps|exps|lifebook|any). |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1802 | psmouse.rate= [HW,MOUSE] Set desired mouse report rate, in reports |
| 1803 | per second. |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 1804 | psmouse.resetafter= [HW,MOUSE] |
| 1805 | Try to reset the device after so many bad packets |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1806 | (0 = never). |
| 1807 | psmouse.resolution= |
| 1808 | [HW,MOUSE] Set desired mouse resolution, in dpi. |
| 1809 | psmouse.smartscroll= |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 1810 | [HW,MOUSE] Controls Logitech smartscroll autorepeat. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1811 | 0 = disabled, 1 = enabled (default). |
| 1812 | |
| 1813 | pss= [HW,OSS] Personal Sound System (ECHO ESC614) |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 1814 | Format: |
| 1815 | <io>,<mss_io>,<mss_irq>,<mss_dma>,<mpu_io>,<mpu_irq> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1816 | |
| 1817 | pt. [PARIDE] |
| 1818 | See Documentation/paride.txt. |
| 1819 | |
Kay Sievers | dc8c858 | 2007-08-15 12:25:38 +0200 | [diff] [blame] | 1820 | pty.legacy_count= |
| 1821 | [KNL] Number of legacy pty's. Overwrites compiled-in |
| 1822 | default number. |
| 1823 | |
Randy Dunlap | 7d2c502 | 2006-09-29 02:01:02 -0700 | [diff] [blame] | 1824 | quiet [KNL] Disable most log messages |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 1825 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1826 | r128= [HW,DRM] |
| 1827 | |
| 1828 | raid= [HW,RAID] |
| 1829 | See Documentation/md.txt. |
| 1830 | |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 1831 | ramdisk_blocksize= [RAM] |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1832 | See Documentation/ramdisk.txt. |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 1833 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1834 | ramdisk_size= [RAM] Sizes of RAM disks in kilobytes |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1835 | See Documentation/ramdisk.txt. |
| 1836 | |
Robert P. J. Day | 24aaef8 | 2008-02-03 15:20:26 +0200 | [diff] [blame] | 1837 | rcupdate.blimit= [KNL,BOOT] |
| 1838 | Set maximum number of finished RCU callbacks to process |
| 1839 | in one batch. |
Dipankar Sarma | 21a1ea9 | 2006-03-07 21:55:33 -0800 | [diff] [blame] | 1840 | |
Robert P. J. Day | 24aaef8 | 2008-02-03 15:20:26 +0200 | [diff] [blame] | 1841 | rcupdate.qhimark= [KNL,BOOT] |
| 1842 | Set threshold of queued |
Dipankar Sarma | 21a1ea9 | 2006-03-07 21:55:33 -0800 | [diff] [blame] | 1843 | RCU callbacks over which batch limiting is disabled. |
| 1844 | |
Robert P. J. Day | 24aaef8 | 2008-02-03 15:20:26 +0200 | [diff] [blame] | 1845 | rcupdate.qlowmark= [KNL,BOOT] |
| 1846 | Set threshold of queued RCU callbacks below which |
| 1847 | batch limiting is re-enabled. |
Dipankar Sarma | 21a1ea9 | 2006-03-07 21:55:33 -0800 | [diff] [blame] | 1848 | |
Olof Johansson | ffdfc40 | 2005-09-06 15:17:19 -0700 | [diff] [blame] | 1849 | rdinit= [KNL] |
| 1850 | Format: <full_path> |
| 1851 | Run specified binary instead of /init from the ramdisk, |
| 1852 | used for early userspace startup. See initrd. |
| 1853 | |
Alan Cox | cd4f0ef | 2007-07-31 00:37:59 -0700 | [diff] [blame] | 1854 | reboot= [BUGS=X86-32,BUGS=ARM,BUGS=IA-64] Rebooting mode |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1855 | Format: <reboot_mode>[,<reboot_mode2>[,...]] |
Mauro Carvalho Chehab | e53dd08 | 2007-09-15 07:38:47 -0300 | [diff] [blame] | 1856 | See arch/*/kernel/reboot.c or arch/*/kernel/process.c |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1857 | |
Paul Jackson | 46b6d94 | 2008-07-04 10:00:09 -0700 | [diff] [blame] | 1858 | relax_domain_level= |
| 1859 | [KNL, SMP] Set scheduler's default relax_domain_level. |
| 1860 | See Documentation/cpusets.txt. |
| 1861 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1862 | reserve= [KNL,BUGS] Force the kernel to ignore some iomem area |
| 1863 | |
Alan Cox | cd4f0ef | 2007-07-31 00:37:59 -0700 | [diff] [blame] | 1864 | reservetop= [X86-32] |
Zachary Amsden | 461a9af | 2006-09-25 23:32:25 -0700 | [diff] [blame] | 1865 | Format: nn[KMG] |
| 1866 | Reserves a hole at the top of the kernel virtual |
| 1867 | address space. |
| 1868 | |
Vivek Goyal | 7e96287 | 2006-09-27 01:50:44 -0700 | [diff] [blame] | 1869 | reset_devices [KNL] Force drivers to reset the underlying device |
| 1870 | during initialization. |
| 1871 | |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 1872 | resume= [SWSUSP] |
| 1873 | Specify the partition device for software suspend |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1874 | |
Rafael J. Wysocki | ecbd0da | 2006-12-06 20:34:13 -0800 | [diff] [blame] | 1875 | resume_offset= [SWSUSP] |
| 1876 | Specify the offset from the beginning of the partition |
| 1877 | given by "resume=" at which the swap header is located, |
| 1878 | in <PAGE_SIZE> units (needed only for swap files). |
| 1879 | See Documentation/power/swsusp-and-swap-files.txt |
| 1880 | |
Michael Neuling | 0a7b35c | 2007-02-10 01:44:33 -0800 | [diff] [blame] | 1881 | retain_initrd [RAM] Keep initrd memory after extraction |
| 1882 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1883 | rhash_entries= [KNL,NET] |
| 1884 | Set number of hash buckets for route cache |
| 1885 | |
| 1886 | riscom8= [HW,SERIAL] |
| 1887 | Format: <io_board1>[,<io_board2>[,...<io_boardN>]] |
| 1888 | |
| 1889 | ro [KNL] Mount root device read-only on boot |
| 1890 | |
| 1891 | root= [KNL] Root filesystem |
| 1892 | |
| 1893 | rootdelay= [KNL] Delay (in seconds) to pause before attempting to |
| 1894 | mount the root filesystem |
| 1895 | |
| 1896 | rootflags= [KNL] Set root filesystem mount option string |
| 1897 | |
| 1898 | rootfstype= [KNL] Set root filesystem type |
| 1899 | |
Pierre Ossman | cc1ed75 | 2007-07-15 23:40:35 -0700 | [diff] [blame] | 1900 | rootwait [KNL] Wait (indefinitely) for root device to show up. |
| 1901 | Useful for devices that are detected asynchronously |
| 1902 | (e.g. USB and MMC devices). |
| 1903 | |
James Morris | 20510f2 | 2007-10-16 23:31:32 -0700 | [diff] [blame] | 1904 | root_plug.vendor_id= |
| 1905 | [ROOTPLUG] Override the default vendor ID |
| 1906 | |
| 1907 | root_plug.product_id= |
| 1908 | [ROOTPLUG] Override the default product ID |
| 1909 | |
| 1910 | root_plug.debug= |
| 1911 | [ROOTPLUG] Enable debugging output |
| 1912 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1913 | rw [KNL] Mount root device read-write on boot |
| 1914 | |
| 1915 | S [KNL] Run init in single mode |
| 1916 | |
| 1917 | sa1100ir [NET] |
| 1918 | See drivers/net/irda/sa1100_ir.c. |
| 1919 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1920 | sbni= [NET] Granch SBNI12 leased line adapter |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 1921 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1922 | sc1200wdt= [HW,WDT] SC1200 WDT (watchdog) driver |
| 1923 | Format: <io>[,<timeout>[,<isapnp>]] |
| 1924 | |
| 1925 | scsi_debug_*= [SCSI] |
| 1926 | See drivers/scsi/scsi_debug.c. |
| 1927 | |
| 1928 | scsi_default_dev_flags= |
| 1929 | [SCSI] SCSI default device flags |
| 1930 | Format: <integer> |
| 1931 | |
| 1932 | scsi_dev_flags= [SCSI] Black/white list entry for vendor and model |
| 1933 | Format: <vendor>:<model>:<flags> |
| 1934 | (flags are integer value) |
| 1935 | |
Randy Dunlap | 6af6632 | 2007-11-14 16:52:25 -0800 | [diff] [blame] | 1936 | scsi_logging_level= [SCSI] a bit mask of logging levels |
| 1937 | See drivers/scsi/scsi_logging.h for bits. Also |
| 1938 | settable via sysctl at dev.scsi.logging_level |
| 1939 | (/proc/sys/dev/scsi/logging_level). |
| 1940 | There is also a nice 'scsi_logging_level' script in the |
| 1941 | S390-tools package, available for download at |
| 1942 | http://www-128.ibm.com/developerworks/linux/linux390/s390-tools-1.5.4.html |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1943 | |
Matthew Wilcox | 3e082a9 | 2006-09-28 15:19:20 -0600 | [diff] [blame] | 1944 | scsi_mod.scan= [SCSI] sync (default) scans SCSI busses as they are |
| 1945 | discovered. async scans them in kernel threads, |
| 1946 | allowing boot to proceed. none ignores them, expecting |
| 1947 | user space to do the scan. |
| 1948 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1949 | selinux [SELINUX] Disable or enable SELinux at boot time. |
| 1950 | Format: { "0" | "1" } |
| 1951 | See security/selinux/Kconfig help text. |
| 1952 | 0 -- disable. |
| 1953 | 1 -- enable. |
| 1954 | Default value is set via kernel config option. |
| 1955 | If enabled at boot time, /selinux/disable can be used |
| 1956 | later to disable prior to initial policy load. |
| 1957 | |
James Morris | 4e5ab4c | 2006-06-09 00:33:33 -0700 | [diff] [blame] | 1958 | selinux_compat_net = |
| 1959 | [SELINUX] Set initial selinux_compat_net flag value. |
Mauro Carvalho Chehab | e53dd08 | 2007-09-15 07:38:47 -0300 | [diff] [blame] | 1960 | Format: { "0" | "1" } |
| 1961 | 0 -- use new secmark-based packet controls |
| 1962 | 1 -- use legacy packet controls |
| 1963 | Default value is 0 (preferred). |
| 1964 | Value can be changed at runtime via |
| 1965 | /selinux/compat_net. |
James Morris | 4e5ab4c | 2006-06-09 00:33:33 -0700 | [diff] [blame] | 1966 | |
Alan Cox | cd4f0ef | 2007-07-31 00:37:59 -0700 | [diff] [blame] | 1967 | serialnumber [BUGS=X86-32] |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1968 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1969 | shapers= [NET] |
| 1970 | Maximal number of shapers. |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 1971 | |
Yinghai Lu | b05f78f | 2008-08-22 01:32:50 -0700 | [diff] [blame] | 1972 | show_msr= [x86] show boot-time MSR settings |
| 1973 | Format: { <integer> } |
| 1974 | Show boot-time (BIOS-initialized) MSR settings. |
| 1975 | The parameter means the number of CPUs to show, |
| 1976 | for example 1 means boot CPU only. |
| 1977 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1978 | sim710= [SCSI,HW] |
| 1979 | See header of drivers/scsi/sim710.c. |
| 1980 | |
| 1981 | simeth= [IA-64] |
| 1982 | simscsi= |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 1983 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1984 | slram= [HW,MTD] |
| 1985 | |
Christoph Lameter | f0630ff | 2007-07-15 23:38:14 -0700 | [diff] [blame] | 1986 | slub_debug[=options[,slabs]] [MM, SLUB] |
| 1987 | Enabling slub_debug allows one to determine the |
| 1988 | culprit if slab objects become corrupted. Enabling |
| 1989 | slub_debug can create guard zones around objects and |
| 1990 | may poison objects when not in use. Also tracks the |
| 1991 | last alloc / free. For more information see |
| 1992 | Documentation/vm/slub.txt. |
Christoph Lameter | c1aee21 | 2007-05-31 00:40:47 -0700 | [diff] [blame] | 1993 | |
| 1994 | slub_max_order= [MM, SLUB] |
Christoph Lameter | f0630ff | 2007-07-15 23:38:14 -0700 | [diff] [blame] | 1995 | Determines the maximum allowed order for slabs. |
| 1996 | A high setting may cause OOMs due to memory |
| 1997 | fragmentation. For more information see |
| 1998 | Documentation/vm/slub.txt. |
Christoph Lameter | c1aee21 | 2007-05-31 00:40:47 -0700 | [diff] [blame] | 1999 | |
| 2000 | slub_min_objects= [MM, SLUB] |
Christoph Lameter | f0630ff | 2007-07-15 23:38:14 -0700 | [diff] [blame] | 2001 | The minimum number of objects per slab. SLUB will |
| 2002 | increase the slab order up to slub_max_order to |
| 2003 | generate a sufficiently large slab able to contain |
| 2004 | the number of objects indicated. The higher the number |
| 2005 | of objects the smaller the overhead of tracking slabs |
| 2006 | and the less frequently locks need to be acquired. |
Christoph Lameter | c1aee21 | 2007-05-31 00:40:47 -0700 | [diff] [blame] | 2007 | For more information see Documentation/vm/slub.txt. |
| 2008 | |
| 2009 | slub_min_order= [MM, SLUB] |
| 2010 | Determines the mininum page order for slabs. Must be |
Christoph Lameter | f0630ff | 2007-07-15 23:38:14 -0700 | [diff] [blame] | 2011 | lower than slub_max_order. |
Christoph Lameter | c1aee21 | 2007-05-31 00:40:47 -0700 | [diff] [blame] | 2012 | For more information see Documentation/vm/slub.txt. |
| 2013 | |
| 2014 | slub_nomerge [MM, SLUB] |
Christoph Lameter | f0630ff | 2007-07-15 23:38:14 -0700 | [diff] [blame] | 2015 | Disable merging of slabs with similar size. May be |
Christoph Lameter | c1aee21 | 2007-05-31 00:40:47 -0700 | [diff] [blame] | 2016 | necessary if there is some reason to distinguish |
Christoph Lameter | f0630ff | 2007-07-15 23:38:14 -0700 | [diff] [blame] | 2017 | allocs to different slabs. Debug options disable |
| 2018 | merging on their own. |
Christoph Lameter | c1aee21 | 2007-05-31 00:40:47 -0700 | [diff] [blame] | 2019 | For more information see Documentation/vm/slub.txt. |
| 2020 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2021 | smart2= [HW] |
| 2022 | Format: <io1>[,<io2>[,...,<io8>]] |
| 2023 | |
Alan Cox | cd4f0ef | 2007-07-31 00:37:59 -0700 | [diff] [blame] | 2024 | smp-alt-once [X86-32,SMP] On a hotplug CPU system, only |
Jeremy Fitzhardinge | b7fb4af | 2007-05-02 19:27:13 +0200 | [diff] [blame] | 2025 | attempt to substitute SMP alternatives once at boot. |
| 2026 | |
Bjorn Helgaas | d0d4f69 | 2007-05-08 00:36:05 -0700 | [diff] [blame] | 2027 | smsc-ircc2.nopnp [HW] Don't use PNP to discover SMC devices |
| 2028 | smsc-ircc2.ircc_cfg= [HW] Device configuration I/O port |
| 2029 | smsc-ircc2.ircc_sir= [HW] SIR base I/O port |
| 2030 | smsc-ircc2.ircc_fir= [HW] FIR base I/O port |
| 2031 | smsc-ircc2.ircc_irq= [HW] IRQ line |
| 2032 | smsc-ircc2.ircc_dma= [HW] DMA channel |
| 2033 | smsc-ircc2.ircc_transceiver= [HW] Transceiver type: |
| 2034 | 0: Toshiba Satellite 1800 (GP data pin select) |
| 2035 | 1: Fast pin select (default) |
| 2036 | 2: ATC IRMode |
| 2037 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2038 | snd-ad1816a= [HW,ALSA] |
| 2039 | |
| 2040 | snd-ad1848= [HW,ALSA] |
| 2041 | |
| 2042 | snd-ali5451= [HW,ALSA] |
| 2043 | |
| 2044 | snd-als100= [HW,ALSA] |
| 2045 | |
| 2046 | snd-als4000= [HW,ALSA] |
| 2047 | |
| 2048 | snd-azt2320= [HW,ALSA] |
| 2049 | |
| 2050 | snd-cmi8330= [HW,ALSA] |
| 2051 | |
| 2052 | snd-cmipci= [HW,ALSA] |
| 2053 | |
| 2054 | snd-cs4231= [HW,ALSA] |
| 2055 | |
| 2056 | snd-cs4232= [HW,ALSA] |
| 2057 | |
| 2058 | snd-cs4236= [HW,ALSA] |
| 2059 | |
| 2060 | snd-cs4281= [HW,ALSA] |
| 2061 | |
| 2062 | snd-cs46xx= [HW,ALSA] |
| 2063 | |
| 2064 | snd-dt019x= [HW,ALSA] |
| 2065 | |
| 2066 | snd-dummy= [HW,ALSA] |
| 2067 | |
| 2068 | snd-emu10k1= [HW,ALSA] |
| 2069 | |
| 2070 | snd-ens1370= [HW,ALSA] |
| 2071 | |
| 2072 | snd-ens1371= [HW,ALSA] |
| 2073 | |
| 2074 | snd-es968= [HW,ALSA] |
| 2075 | |
| 2076 | snd-es1688= [HW,ALSA] |
| 2077 | |
| 2078 | snd-es18xx= [HW,ALSA] |
| 2079 | |
| 2080 | snd-es1938= [HW,ALSA] |
| 2081 | |
| 2082 | snd-es1968= [HW,ALSA] |
| 2083 | |
| 2084 | snd-fm801= [HW,ALSA] |
| 2085 | |
| 2086 | snd-gusclassic= [HW,ALSA] |
| 2087 | |
| 2088 | snd-gusextreme= [HW,ALSA] |
| 2089 | |
| 2090 | snd-gusmax= [HW,ALSA] |
| 2091 | |
| 2092 | snd-hdsp= [HW,ALSA] |
| 2093 | |
| 2094 | snd-ice1712= [HW,ALSA] |
| 2095 | |
| 2096 | snd-intel8x0= [HW,ALSA] |
| 2097 | |
| 2098 | snd-interwave= [HW,ALSA] |
| 2099 | |
| 2100 | snd-interwave-stb= |
| 2101 | [HW,ALSA] |
| 2102 | |
| 2103 | snd-korg1212= [HW,ALSA] |
| 2104 | |
| 2105 | snd-maestro3= [HW,ALSA] |
| 2106 | |
| 2107 | snd-mpu401= [HW,ALSA] |
| 2108 | |
| 2109 | snd-mtpav= [HW,ALSA] |
| 2110 | |
| 2111 | snd-nm256= [HW,ALSA] |
| 2112 | |
| 2113 | snd-opl3sa2= [HW,ALSA] |
| 2114 | |
| 2115 | snd-opti92x-ad1848= |
| 2116 | [HW,ALSA] |
| 2117 | |
| 2118 | snd-opti92x-cs4231= |
| 2119 | [HW,ALSA] |
| 2120 | |
| 2121 | snd-opti93x= [HW,ALSA] |
| 2122 | |
| 2123 | snd-pmac= [HW,ALSA] |
| 2124 | |
| 2125 | snd-rme32= [HW,ALSA] |
| 2126 | |
| 2127 | snd-rme96= [HW,ALSA] |
| 2128 | |
| 2129 | snd-rme9652= [HW,ALSA] |
| 2130 | |
| 2131 | snd-sb8= [HW,ALSA] |
| 2132 | |
| 2133 | snd-sb16= [HW,ALSA] |
| 2134 | |
| 2135 | snd-sbawe= [HW,ALSA] |
| 2136 | |
| 2137 | snd-serial= [HW,ALSA] |
| 2138 | |
| 2139 | snd-sgalaxy= [HW,ALSA] |
| 2140 | |
| 2141 | snd-sonicvibes= [HW,ALSA] |
| 2142 | |
| 2143 | snd-sun-amd7930= |
| 2144 | [HW,ALSA] |
| 2145 | |
| 2146 | snd-sun-cs4231= [HW,ALSA] |
| 2147 | |
| 2148 | snd-trident= [HW,ALSA] |
| 2149 | |
| 2150 | snd-usb-audio= [HW,ALSA,USB] |
| 2151 | |
| 2152 | snd-via82xx= [HW,ALSA] |
| 2153 | |
| 2154 | snd-virmidi= [HW,ALSA] |
| 2155 | |
| 2156 | snd-wavefront= [HW,ALSA] |
| 2157 | |
| 2158 | snd-ymfpci= [HW,ALSA] |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 2159 | |
Ingo Molnar | 9c44bc0 | 2008-05-12 21:21:04 +0200 | [diff] [blame] | 2160 | softlockup_panic= |
| 2161 | [KNL] Should the soft-lockup detector generate panics. |
| 2162 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2163 | sonypi.*= [HW] Sony Programmable I/O Control Device driver |
| 2164 | See Documentation/sonypi.txt |
| 2165 | |
| 2166 | specialix= [HW,SERIAL] Specialix multi-serial port adapter |
| 2167 | See Documentation/specialix.txt. |
| 2168 | |
| 2169 | spia_io_base= [HW,MTD] |
| 2170 | spia_fio_base= |
| 2171 | spia_pedr= |
| 2172 | spia_peddr= |
| 2173 | |
| 2174 | sscape= [HW,OSS] |
| 2175 | Format: <io>,<irq>,<dma>,<mpu_io>,<mpu_irq> |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 2176 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2177 | st= [HW,SCSI] SCSI tape parameters (buffers, etc.) |
| 2178 | See Documentation/scsi/st.txt. |
| 2179 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2180 | sti= [PARISC,HW] |
| 2181 | Format: <num> |
| 2182 | Set the STI (builtin display/keyboard on the HP-PARISC |
| 2183 | machines) console (graphic card) which should be used |
| 2184 | as the initial boot-console. |
| 2185 | See also comment in drivers/video/console/sticore.c. |
| 2186 | |
| 2187 | sti_font= [HW] |
| 2188 | See comment in drivers/video/console/sticore.c. |
| 2189 | |
| 2190 | stifb= [HW] |
| 2191 | Format: bpp:<bpp1>[:<bpp2>[:<bpp3>...]] |
| 2192 | |
Greg Banks | 42a7fc4 | 2007-03-06 01:42:23 -0800 | [diff] [blame] | 2193 | sunrpc.pool_mode= |
| 2194 | [NFS] |
| 2195 | Control how the NFS server code allocates CPUs to |
| 2196 | service thread pools. Depending on how many NICs |
| 2197 | you have and where their interrupts are bound, this |
| 2198 | option will affect which CPUs will do NFS serving. |
| 2199 | Note: this parameter cannot be changed while the |
| 2200 | NFS server is running. |
| 2201 | |
| 2202 | auto the server chooses an appropriate mode |
| 2203 | automatically using heuristics |
| 2204 | global a single global pool contains all CPUs |
| 2205 | percpu one pool for each CPU |
| 2206 | pernode one pool for each NUMA node (equivalent |
| 2207 | to global on non-NUMA machines) |
| 2208 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2209 | swiotlb= [IA-64] Number of I/O TLB slabs |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 2210 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2211 | switches= [HW,M68k] |
| 2212 | |
| 2213 | sym53c416= [HW,SCSI] |
| 2214 | See header of drivers/scsi/sym53c416.c. |
| 2215 | |
Ingo Molnar | 5d6f647 | 2006-12-13 00:34:36 -0800 | [diff] [blame] | 2216 | sysrq_always_enabled |
| 2217 | [KNL] |
| 2218 | Ignore sysrq setting - this boot parameter will |
| 2219 | neutralize any effect of /proc/sys/kernel/sysrq. |
| 2220 | Useful for debugging. |
| 2221 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2222 | t128= [HW,SCSI] |
| 2223 | See header of drivers/scsi/t128.c. |
| 2224 | |
| 2225 | tdfx= [HW,DRM] |
| 2226 | |
David Brownell | 77437fd | 2008-07-23 21:28:33 -0700 | [diff] [blame] | 2227 | test_suspend= [SUSPEND] |
| 2228 | Specify "mem" (for Suspend-to-RAM) or "standby" (for |
| 2229 | standby suspend) as the system sleep state to briefly |
| 2230 | enter during system startup. The system is woken from |
| 2231 | this state using a wakeup-capable RTC alarm. |
| 2232 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2233 | thash_entries= [KNL,NET] |
| 2234 | Set number of hash buckets for TCP connection |
| 2235 | |
Len Brown | f8707ec | 2007-08-12 00:12:54 -0400 | [diff] [blame] | 2236 | thermal.act= [HW,ACPI] |
| 2237 | -1: disable all active trip points in all thermal zones |
| 2238 | <degrees C>: override all lowest active trip points |
| 2239 | |
Len Brown | c52a741 | 2007-08-14 15:49:32 -0400 | [diff] [blame] | 2240 | thermal.crt= [HW,ACPI] |
| 2241 | -1: disable all critical trip points in all thermal zones |
Zhang Rui | 22a94d7 | 2008-10-17 02:41:20 -0400 | [diff] [blame] | 2242 | <degrees C>: override all critical trip points |
Len Brown | c52a741 | 2007-08-14 15:49:32 -0400 | [diff] [blame] | 2243 | |
Len Brown | f548714 | 2007-08-12 00:12:44 -0400 | [diff] [blame] | 2244 | thermal.nocrt= [HW,ACPI] |
| 2245 | Set to disable actions on ACPI thermal zone |
| 2246 | critical and hot trip points. |
| 2247 | |
Len Brown | 72b33ef | 2007-08-12 00:12:17 -0400 | [diff] [blame] | 2248 | thermal.off= [HW,ACPI] |
| 2249 | 1: disable ACPI thermal control |
| 2250 | |
Len Brown | a70cdc5 | 2007-08-12 00:12:35 -0400 | [diff] [blame] | 2251 | thermal.psv= [HW,ACPI] |
| 2252 | -1: disable all passive trip points |
| 2253 | <degrees C>: override all passive trip points to this value |
| 2254 | |
Len Brown | 730ff34 | 2007-08-12 00:12:26 -0400 | [diff] [blame] | 2255 | thermal.tzp= [HW,ACPI] |
| 2256 | Specify global default ACPI thermal zone polling rate |
| 2257 | <deci-seconds>: poll all this frequency |
| 2258 | 0: no polling (default) |
| 2259 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2260 | tmscsim= [HW,SCSI] |
| 2261 | See comment before function dc390_setup() in |
| 2262 | drivers/scsi/tmscsim.c. |
| 2263 | |
| 2264 | tp720= [HW,PS2] |
| 2265 | |
| 2266 | trix= [HW,OSS] MediaTrix AudioTrix Pro |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 2267 | Format: |
| 2268 | <io>,<irq>,<dma>,<dma2>,<sb_io>,<sb_irq>,<sb_dma>,<mpu_io>,<mpu_irq> |
| 2269 | |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 2270 | turbografx.map[2|3]= [HW,JOY] |
| 2271 | TurboGraFX parallel port interface |
| 2272 | Format: |
| 2273 | <port#>,<js1>,<js2>,<js3>,<js4>,<js5>,<js6>,<js7> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2274 | See also Documentation/input/joystick-parport.txt |
| 2275 | |
| 2276 | u14-34f= [HW,SCSI] UltraStor 14F/34F SCSI host adapter |
| 2277 | See header of drivers/scsi/u14-34f.c. |
| 2278 | |
| 2279 | uart401= [HW,OSS] |
| 2280 | Format: <io>,<irq> |
| 2281 | |
| 2282 | uart6850= [HW,OSS] |
| 2283 | Format: <io>,<irq> |
| 2284 | |
Alan Stern | 5f8364b | 2006-12-05 16:29:55 -0500 | [diff] [blame] | 2285 | uhci-hcd.ignore_oc= |
| 2286 | [USB] Ignore overcurrent events (default N). |
| 2287 | Some badly-designed motherboards generate lots of |
| 2288 | bogus events, for ports that aren't wired to |
| 2289 | anything. Set this parameter to avoid log spamming. |
| 2290 | Note that genuine overcurrent events won't be |
| 2291 | reported either. |
| 2292 | |
Simon Arlott | e3a61b0 | 2008-07-19 23:32:54 +0100 | [diff] [blame] | 2293 | unknown_nmi_panic |
| 2294 | [X86-32,X86-64] |
| 2295 | Set unknown_nmi_panic=1 early on boot. |
| 2296 | |
Alan Stern | b5e795f | 2007-02-20 15:00:53 -0500 | [diff] [blame] | 2297 | usbcore.autosuspend= |
| 2298 | [USB] The autosuspend time delay (in seconds) used |
| 2299 | for newly-detected USB devices (default 2). This |
| 2300 | is the time required before an idle device will be |
| 2301 | autosuspended. Devices for which the delay is set |
Alan Stern | eaafbc3 | 2007-03-13 16:39:15 -0400 | [diff] [blame] | 2302 | to a negative value won't be autosuspended at all. |
Alan Stern | b5e795f | 2007-02-20 15:00:53 -0500 | [diff] [blame] | 2303 | |
Jaroslav Kysela | fd7c519 | 2008-10-10 16:24:45 +0200 | [diff] [blame] | 2304 | usbcore.usbfs_snoop= |
| 2305 | [USB] Set to log all usbfs traffic (default 0 = off). |
| 2306 | |
| 2307 | usbcore.blinkenlights= |
| 2308 | [USB] Set to cycle leds on hubs (default 0 = off). |
| 2309 | |
| 2310 | usbcore.old_scheme_first= |
| 2311 | [USB] Start with the old device initialization |
| 2312 | scheme (default 0 = off). |
| 2313 | |
| 2314 | usbcore.use_both_schemes= |
| 2315 | [USB] Try the other device initialization scheme |
| 2316 | if the first one fails (default 1 = enabled). |
| 2317 | |
| 2318 | usbcore.initial_descriptor_timeout= |
| 2319 | [USB] Specifies timeout for the initial 64-byte |
| 2320 | USB_REQ_GET_DESCRIPTOR request in milliseconds |
| 2321 | (default 5000 = 5.0 seconds). |
| 2322 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2323 | usbhid.mousepoll= |
| 2324 | [USBHID] The interval which mice are to be polled at. |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 2325 | |
Paul Jackson | 200001e | 2008-06-25 05:44:46 -0700 | [diff] [blame] | 2326 | add_efi_memmap [EFI; x86-32,X86-64] Include EFI memory map in |
| 2327 | kernel's map of available physical RAM. |
| 2328 | |
Alan Cox | cd4f0ef | 2007-07-31 00:37:59 -0700 | [diff] [blame] | 2329 | vdso= [X86-32,SH,x86-64] |
Jeremy Fitzhardinge | 1dbf527 | 2007-05-02 19:27:12 +0200 | [diff] [blame] | 2330 | vdso=2: enable compat VDSO (default with COMPAT_VDSO) |
Ingo Molnar | e6e5494 | 2006-06-27 02:53:50 -0700 | [diff] [blame] | 2331 | vdso=1: enable VDSO (default) |
| 2332 | vdso=0: disable VDSO mapping |
| 2333 | |
Roland McGrath | af65d64 | 2008-01-30 13:30:43 +0100 | [diff] [blame] | 2334 | vdso32= [X86-32,X86-64] |
| 2335 | vdso32=2: enable compat VDSO (default with COMPAT_VDSO) |
| 2336 | vdso32=1: enable 32-bit VDSO (default) |
| 2337 | vdso32=0: disable 32-bit VDSO mapping |
| 2338 | |
Yasuaki Ishimatsu | d080d39 | 2007-07-17 21:22:55 +0900 | [diff] [blame] | 2339 | vector= [IA-64,SMP] |
| 2340 | vector=percpu: enable percpu vector domain |
| 2341 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2342 | video= [FB] Frame buffer configuration |
| 2343 | See Documentation/fb/modedb.txt. |
| 2344 | |
Alan Cox | cd4f0ef | 2007-07-31 00:37:59 -0700 | [diff] [blame] | 2345 | vga= [BOOT,X86-32] Select a particular video mode |
Uwe Hermann | 71cced6 | 2008-10-20 09:32:21 -0700 | [diff] [blame] | 2346 | See Documentation/x86/i386/boot.txt and |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 2347 | Documentation/svga.txt. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2348 | Use vga=ask for menu. |
| 2349 | This is actually a boot loader parameter; the value is |
| 2350 | passed to the kernel using a special protocol. |
| 2351 | |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 2352 | vmalloc=nn[KMG] [KNL,BOOT] Forces the vmalloc area to have an exact |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2353 | size of <nn>. This can be used to increase the |
| 2354 | minimum size (128MB on x86). It can also be used to |
| 2355 | decrease the size and leave more room for directly |
| 2356 | mapped kernel RAM. |
| 2357 | |
Peter Oberparleiter | 585c304 | 2006-06-29 15:08:25 +0200 | [diff] [blame] | 2358 | vmhalt= [KNL,S390] Perform z/VM CP command after system halt. |
| 2359 | Format: <command> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2360 | |
Peter Oberparleiter | 585c304 | 2006-06-29 15:08:25 +0200 | [diff] [blame] | 2361 | vmpanic= [KNL,S390] Perform z/VM CP command after kernel panic. |
| 2362 | Format: <command> |
| 2363 | |
| 2364 | vmpoff= [KNL,S390] Perform z/VM CP command after power off. |
| 2365 | Format: <command> |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 2366 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2367 | waveartist= [HW,OSS] |
| 2368 | Format: <io>,<irq>,<dma>,<dma2> |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 2369 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2370 | wd33c93= [HW,SCSI] |
| 2371 | See header of drivers/scsi/wd33c93.c. |
| 2372 | |
| 2373 | wd7000= [HW,SCSI] |
| 2374 | See header of drivers/scsi/wd7000.c. |
| 2375 | |
| 2376 | wdt= [WDT] Watchdog |
Gabriel C | 8dfe9c2 | 2007-08-10 13:01:00 -0700 | [diff] [blame] | 2377 | See Documentation/watchdog/wdt.txt. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2378 | |
| 2379 | xd= [HW,XT] Original XT pre-IDE (RLL encoded) disks. |
| 2380 | xd_geo= See header of drivers/block/xd.c. |
| 2381 | |
| 2382 | xirc2ps_cs= [NET,PCMCIA] |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 2383 | Format: |
| 2384 | <irq>,<irq_mask>,<io>,<full_duplex>,<do_sound>,<lockup_hack>[,<irq2>[,<irq3>[,<irq4>]]] |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2385 | |
Andi Kleen | a62eaf1 | 2006-02-16 23:41:58 +0100 | [diff] [blame] | 2386 | norandmaps Don't use address space randomization |
| 2387 | Equivalent to echo 0 > /proc/sys/kernel/randomize_va_space |
| 2388 | |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 2389 | ______________________________________________________________________ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2390 | |
| 2391 | TODO: |
| 2392 | |
| 2393 | Add documentation for ALSA options. |
| 2394 | Add more DRM drivers. |