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. |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 90 | SWSUSP Software suspend is enabled. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 91 | TS Appropriate touchscreen support is enabled. |
| 92 | USB USB support is enabled. |
| 93 | USBHID USB Human Interface Device support is enabled. |
| 94 | V4L Video For Linux support is enabled. |
| 95 | VGA The VGA console has been enabled. |
| 96 | VT Virtual terminal support is enabled. |
| 97 | WDT Watchdog support is enabled. |
| 98 | XT IBM PC/XT MFM hard disk support is enabled. |
Alan Cox | cd4f0ef | 2007-07-31 00:37:59 -0700 | [diff] [blame] | 99 | X86-32 X86-32, aka i386 architecture is enabled. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 100 | X86-64 X86-64 architecture is enabled. |
| 101 | More X86-64 boot options can be found in |
| 102 | Documentation/x86_64/boot-options.txt . |
| 103 | |
| 104 | In addition, the following text indicates that the option: |
| 105 | |
| 106 | BUGS= Relates to possible processor bugs on the said processor. |
| 107 | KNL Is a kernel start-up parameter. |
| 108 | BOOT Is a boot loader parameter. |
| 109 | |
| 110 | Parameters denoted with BOOT are actually interpreted by the boot |
| 111 | loader, and have no meaning to the kernel directly. |
| 112 | Do not modify the syntax of boot loader parameters without extreme |
| 113 | need or coordination with <Documentation/i386/boot.txt>. |
| 114 | |
Karsten Weiss | 5558870 | 2007-02-13 13:26:21 +0100 | [diff] [blame] | 115 | There are also arch-specific kernel-parameters not documented here. |
| 116 | See for example <Documentation/x86_64/boot-options.txt>. |
| 117 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 118 | Note that ALL kernel parameters listed below are CASE SENSITIVE, and that |
| 119 | a trailing = on the name of any parameter states that that parameter will |
| 120 | be entered as an environment variable, whereas its absence indicates that |
| 121 | it will appear as a kernel argument readable via /proc/cmdline by programs |
| 122 | running once the system is up. |
| 123 | |
jens m. noedler | 9c4751f | 2006-09-29 02:00:27 -0700 | [diff] [blame] | 124 | The number of kernel parameters is not limited, but the length of the |
| 125 | complete command line (parameters including spaces etc.) is limited to |
| 126 | a fixed number of characters. This limit depends on the architecture |
| 127 | and is between 256 and 4096 characters. It is defined in the file |
| 128 | ./include/asm/setup.h as COMMAND_LINE_SIZE. |
| 129 | |
| 130 | |
Bernhard Walle | 03d926f | 2007-03-06 02:29:44 -0800 | [diff] [blame] | 131 | acpi= [HW,ACPI,X86-64,i386] |
| 132 | Advanced Configuration and Power Interface |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 133 | Format: { force | off | ht | strict | noirq } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 134 | force -- enable ACPI if default was off |
| 135 | off -- disable ACPI if default was on |
| 136 | noirq -- do not use ACPI for IRQ routing |
| 137 | ht -- run only enough ACPI to enable Hyper Threading |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 138 | strict -- Be less tolerant of platforms that are not |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 139 | strictly ACPI specification compliant. |
| 140 | |
| 141 | See also Documentation/pm.txt, pci=noacpi |
| 142 | |
Len Brown | a1fdcc0 | 2007-03-11 03:26:14 -0400 | [diff] [blame] | 143 | acpi_apic_instance= [ACPI, IOAPIC] |
| 144 | Format: <int> |
| 145 | 2: use 2nd APIC table, if available |
| 146 | 1,0: use 1st APIC table |
Len Brown | 4e381a4 | 2007-03-30 14:16:10 -0400 | [diff] [blame] | 147 | default: 0 |
Len Brown | a1fdcc0 | 2007-03-11 03:26:14 -0400 | [diff] [blame] | 148 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 149 | acpi_sleep= [HW,ACPI] Sleep options |
| 150 | Format: { s3_bios, s3_mode } |
| 151 | See Documentation/power/video.txt |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 152 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 153 | acpi_sci= [HW,ACPI] ACPI System Control Interrupt trigger mode |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 154 | Format: { level | edge | high | low } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 155 | |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 156 | acpi_irq_balance [HW,ACPI] |
| 157 | ACPI will balance active IRQs |
| 158 | default in APIC mode |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 159 | |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 160 | acpi_irq_nobalance [HW,ACPI] |
| 161 | ACPI will not move active IRQs (default) |
| 162 | default in PIC mode |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 163 | |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 164 | acpi_irq_pci= [HW,ACPI] If irq_balance, clear listed IRQs for |
| 165 | use by PCI |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 166 | Format: <irq>,<irq>... |
| 167 | |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 168 | 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] | 169 | Format: <irq>,<irq>... |
| 170 | |
Rafael J. Wysocki | 60417f5 | 2008-01-08 00:07:39 +0100 | [diff] [blame] | 171 | acpi_new_pts_ordering [HW,ACPI] |
| 172 | Enforce the ACPI 2.0 ordering of the _PTS control |
| 173 | method wrt putting devices into low power states |
| 174 | default: pre ACPI 2.0 ordering of _PTS |
| 175 | |
Len Brown | 67effe8 | 2007-07-26 00:50:06 -0400 | [diff] [blame] | 176 | acpi_no_auto_ssdt [HW,ACPI] Disable automatic loading of SSDT |
| 177 | |
Len Brown | a1f9e65 | 2006-01-25 23:47:36 -0500 | [diff] [blame] | 178 | acpi_os_name= [HW,ACPI] Tell ACPI BIOS the name of the OS |
| 179 | Format: To spoof as Windows 98: ="Microsoft Windows" |
| 180 | |
Len Brown | ae00d81 | 2007-05-29 18:43:33 -0400 | [diff] [blame] | 181 | acpi_osi= [HW,ACPI] Modify list of supported OS interface strings |
| 182 | acpi_osi="string1" # add string1 -- only one string |
| 183 | acpi_osi="!string2" # remove built-in string2 |
| 184 | acpi_osi= # disable all strings |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 185 | |
| 186 | acpi_serialize [HW,ACPI] force serialization of AML methods |
| 187 | |
| 188 | acpi_skip_timer_override [HW,ACPI] |
| 189 | Recognize and ignore IRQ0/pin2 Interrupt Override. |
| 190 | For broken nForce2 BIOS resulting in XT-PIC timer. |
Andi Kleen | fa18f47 | 2006-11-14 16:57:46 +0100 | [diff] [blame] | 191 | acpi_use_timer_override [HW,ACPI} |
| 192 | Use timer override. For some broken Nvidia NF5 boards |
| 193 | that require a timer override, but don't have |
| 194 | HPET |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 195 | |
Zhang Rui | f989106 | 2007-04-24 13:53:22 +0800 | [diff] [blame] | 196 | acpi.debug_layer= [HW,ACPI] |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 197 | Format: <int> |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 198 | Each bit of the <int> indicates an ACPI debug layer, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 199 | 1: enable, 0: disable. It is useful for boot time |
| 200 | debugging. After system has booted up, it can be set |
Zhang Rui | f989106 | 2007-04-24 13:53:22 +0800 | [diff] [blame] | 201 | via /sys/module/acpi/parameters/debug_layer. |
| 202 | CONFIG_ACPI_DEBUG must be enabled for this to produce any output. |
| 203 | Available bits (add the numbers together) to enable debug output |
| 204 | for specific parts of the ACPI subsystem: |
| 205 | 0x01 utilities 0x02 hardware 0x04 events 0x08 tables |
| 206 | 0x10 namespace 0x20 parser 0x40 dispatcher |
| 207 | 0x80 executer 0x100 resources 0x200 acpica debugger |
| 208 | 0x400 os services 0x800 acpica disassembler. |
| 209 | The number can be in decimal or prefixed with 0x in hex. |
| 210 | Warning: Many of these options can produce a lot of |
| 211 | output and make your system unusable. Be very careful. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 212 | |
Zhang Rui | f989106 | 2007-04-24 13:53:22 +0800 | [diff] [blame] | 213 | acpi.debug_level= [HW,ACPI] |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 214 | Format: <int> |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 215 | Each bit of the <int> indicates an ACPI debug level, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 216 | 1: enable, 0: disable. It is useful for boot time |
| 217 | debugging. After system has booted up, it can be set |
Zhang Rui | f989106 | 2007-04-24 13:53:22 +0800 | [diff] [blame] | 218 | via /sys/module/acpi/parameters/debug_level. |
| 219 | CONFIG_ACPI_DEBUG must be enabled for this to produce any output. |
| 220 | Available bits (add the numbers together) to enable different |
| 221 | debug output levels of the ACPI subsystem: |
| 222 | 0x01 error 0x02 warn 0x04 init 0x08 debug object |
| 223 | 0x10 info 0x20 init names 0x40 parse 0x80 load |
| 224 | 0x100 dispatch 0x200 execute 0x400 names 0x800 operation region |
| 225 | 0x1000 bfield 0x2000 tables 0x4000 values 0x8000 objects |
| 226 | 0x10000 resources 0x20000 user requests 0x40000 package. |
| 227 | The number can be in decimal or prefixed with 0x in hex. |
| 228 | Warning: Many of these options can produce a lot of |
| 229 | output and make your system unusable. Be very careful. |
| 230 | |
Alan Cox | cd4f0ef | 2007-07-31 00:37:59 -0700 | [diff] [blame] | 231 | acpi_pm_good [X86-32,X86-64] |
john stultz | 5d0cf41 | 2006-06-26 00:25:12 -0700 | [diff] [blame] | 232 | Override the pmtimer bug detection: force the kernel |
| 233 | to assume that this machine's pmtimer latches its value |
| 234 | and always returns good values. |
| 235 | |
Chuck Ebbert | c99c108 | 2007-07-27 10:46:20 +1000 | [diff] [blame] | 236 | agp= [AGP] |
| 237 | { off | try_unsupported } |
| 238 | off: disable AGP support |
| 239 | try_unsupported: try to drive unsupported chipsets |
| 240 | (may crash computer or cause data corruption) |
| 241 | |
Chuck Ebbert | 66759a0 | 2005-09-12 18:49:25 +0200 | [diff] [blame] | 242 | enable_timer_pin_1 [i386,x86-64] |
| 243 | Enable PIN 1 of APIC timer |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 244 | Can be useful to work around chipset bugs |
| 245 | (in particular on some ATI chipsets). |
Chuck Ebbert | 66759a0 | 2005-09-12 18:49:25 +0200 | [diff] [blame] | 246 | The kernel tries to set a reasonable default. |
| 247 | |
| 248 | disable_timer_pin_1 [i386,x86-64] |
| 249 | Disable PIN 1 of APIC timer |
| 250 | Can be useful to work around chipset bugs. |
| 251 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 252 | ad1848= [HW,OSS] |
| 253 | Format: <io>,<irq>,<dma>,<dma2>,<type> |
| 254 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 255 | advansys= [HW,SCSI] |
| 256 | See header of drivers/scsi/advansys.c. |
| 257 | |
| 258 | advwdt= [HW,WDT] Advantech WDT |
| 259 | Format: <iostart>,<iostop> |
| 260 | |
| 261 | aedsp16= [HW,OSS] Audio Excel DSP 16 |
| 262 | Format: <io>,<irq>,<dma>,<mss_io>,<mpu_io>,<mpu_irq> |
| 263 | See also header of sound/oss/aedsp16.c. |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 264 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 265 | aha152x= [HW,SCSI] |
| 266 | See Documentation/scsi/aha152x.txt. |
| 267 | |
| 268 | aha1542= [HW,SCSI] |
| 269 | Format: <portbase>[,<buson>,<busoff>[,<dmaspeed>]] |
| 270 | |
| 271 | aic7xxx= [HW,SCSI] |
| 272 | See Documentation/scsi/aic7xxx.txt. |
| 273 | |
| 274 | aic79xx= [HW,SCSI] |
| 275 | See Documentation/scsi/aic79xx.txt. |
| 276 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 277 | amijoy.map= [HW,JOY] Amiga joystick support |
| 278 | Map of devices attached to JOY0DAT and JOY1DAT |
| 279 | Format: <a>,<b> |
| 280 | See also Documentation/kernel/input/joystick.txt |
| 281 | |
| 282 | analog.map= [HW,JOY] Analog joystick and gamepad support |
| 283 | Specifies type or capabilities of an analog joystick |
| 284 | connected to one of 16 gameports |
| 285 | Format: <type1>,<type2>,..<type16> |
| 286 | |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 287 | apc= [HW,SPARC] |
| 288 | Power management functions (SPARCstation-4/5 + deriv.) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 289 | Format: noidle |
| 290 | Disable APC CPU standby support. SPARCstation-Fox does |
| 291 | not play well with APC CPU idle - disable it if you have |
| 292 | APC and your system crashes randomly. |
| 293 | |
Randy Dunlap | c8facbb | 2007-07-31 00:37:40 -0700 | [diff] [blame] | 294 | apic= [APIC,i386] Advanced Programmable Interrupt Controller |
| 295 | Change the output verbosity whilst booting |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 296 | Format: { quiet (default) | verbose | debug } |
| 297 | Change the amount of debugging information output |
| 298 | when initialising the APIC and IO-APIC components. |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 299 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 300 | apm= [APM] Advanced Power Management |
| 301 | See header of arch/i386/kernel/apm.c. |
| 302 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 303 | arcrimi= [HW,NET] ARCnet - "RIM I" (entirely mem-mapped) cards |
| 304 | Format: <io>,<irq>,<nodeID> |
| 305 | |
| 306 | ataflop= [HW,M68k] |
| 307 | |
| 308 | atarimouse= [HW,MOUSE] Atari Mouse |
| 309 | |
| 310 | atascsi= [HW,SCSI] Atari SCSI |
| 311 | |
| 312 | atkbd.extra= [HW] Enable extra LEDs and keys on IBM RapidAccess, |
| 313 | EzKey and similar keyboards |
| 314 | |
| 315 | atkbd.reset= [HW] Reset keyboard during initialization |
| 316 | |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 317 | atkbd.set= [HW] Select keyboard code set |
| 318 | Format: <int> (2 = AT (default), 3 = PS/2) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 319 | |
| 320 | atkbd.scroll= [HW] Enable scroll wheel on MS Office and similar |
| 321 | keyboards |
| 322 | |
| 323 | atkbd.softraw= [HW] Choose between synthetic and real raw mode |
| 324 | Format: <bool> (0 = real, 1 = synthetic (default)) |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 325 | |
| 326 | atkbd.softrepeat= [HW] |
| 327 | Use software keyboard repeat |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 328 | |
| 329 | autotest [IA64] |
| 330 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 331 | baycom_epp= [HW,AX25] |
| 332 | Format: <io>,<mode> |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 333 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 334 | baycom_par= [HW,AX25] BayCom Parallel Port AX.25 Modem |
| 335 | Format: <io>,<mode> |
| 336 | See header of drivers/net/hamradio/baycom_par.c. |
| 337 | |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 338 | baycom_ser_fdx= [HW,AX25] |
| 339 | BayCom Serial Port AX.25 Modem (Full Duplex Mode) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 340 | Format: <io>,<irq>,<mode>[,<baud>] |
| 341 | See header of drivers/net/hamradio/baycom_ser_fdx.c. |
| 342 | |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 343 | baycom_ser_hdx= [HW,AX25] |
| 344 | BayCom Serial Port AX.25 Modem (Half Duplex Mode) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 345 | Format: <io>,<irq>,<mode> |
| 346 | See header of drivers/net/hamradio/baycom_ser_hdx.c. |
| 347 | |
Randy Dunlap | bfe8df3 | 2007-10-16 01:23:46 -0700 | [diff] [blame] | 348 | boot_delay= Milliseconds to delay each printk during boot. |
| 349 | Values larger than 10 seconds (10000) are changed to |
| 350 | no delay (0). |
| 351 | Format: integer |
| 352 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 353 | bttv.card= [HW,V4L] bttv (bt848 + bt878 based grabber cards) |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 354 | bttv.radio= Most important insmod options are available as |
| 355 | kernel args too. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 356 | bttv.pll= See Documentation/video4linux/bttv/Insmod-options |
| 357 | bttv.tuner= and Documentation/video4linux/bttv/CARDLIST |
| 358 | |
| 359 | BusLogic= [HW,SCSI] |
| 360 | See drivers/scsi/BusLogic.c, comment before function |
| 361 | BusLogic_ParseDriverOptions(). |
| 362 | |
| 363 | c101= [NET] Moxa C101 synchronous serial card |
| 364 | |
Alan Cox | cd4f0ef | 2007-07-31 00:37:59 -0700 | [diff] [blame] | 365 | cachesize= [BUGS=X86-32] Override level 2 CPU cache size detection. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 366 | Sometimes CPU hardware bugs make them report the cache |
| 367 | size incorrectly. The kernel will attempt work arounds |
| 368 | to fix known problems, but for some CPUs it is not |
| 369 | possible to determine what the correct size should be. |
| 370 | This option provides an override for these situations. |
| 371 | |
James Morris | 20510f2 | 2007-10-16 23:31:32 -0700 | [diff] [blame] | 372 | capability.disable= |
| 373 | [SECURITY] Disable capabilities. This would normally |
| 374 | be used only if an alternative security model is to be |
| 375 | configured. Potentially dangerous and should only be |
| 376 | used if you are entirely sure of the consequences. |
| 377 | |
Sebastian Ott | 14ff56b | 2008-01-26 14:10:37 +0100 | [diff] [blame] | 378 | ccw_timeout_log [S390] |
| 379 | See Documentation/s390/CommonIO for details. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 380 | |
| 381 | checkreqprot [SELINUX] Set initial checkreqprot flag value. |
| 382 | Format: { "0" | "1" } |
| 383 | See security/selinux/Kconfig help text. |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 384 | 0 -- check protection applied by kernel (includes |
| 385 | any implied execute protection). |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 386 | 1 -- check protection requested by application. |
| 387 | Default value is set via a kernel config option. |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 388 | Value can be changed at runtime via |
| 389 | /selinux/checkreqprot. |
| 390 | |
Sebastian Ott | 661ca0d | 2008-01-26 14:10:36 +0100 | [diff] [blame] | 391 | cio_ignore= [S390] |
| 392 | See Documentation/s390/CommonIO for details. |
| 393 | |
| 394 | cio_msg= [S390] |
| 395 | See Documentation/s390/CommonIO for details. |
| 396 | |
Alan Cox | cd4f0ef | 2007-07-31 00:37:59 -0700 | [diff] [blame] | 397 | clock= [BUGS=X86-32, HW] gettimeofday clocksource override. |
john stultz | 734efb4 | 2006-06-26 00:25:05 -0700 | [diff] [blame] | 398 | [Deprecated] |
Matt LaPlante | 3f6dee9 | 2006-10-03 22:45:33 +0200 | [diff] [blame] | 399 | Forces specified clocksource (if available) to be used |
john stultz | 734efb4 | 2006-06-26 00:25:05 -0700 | [diff] [blame] | 400 | when calculating gettimeofday(). If specified |
Matt LaPlante | 3f6dee9 | 2006-10-03 22:45:33 +0200 | [diff] [blame] | 401 | clocksource is not available, it defaults to PIT. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 402 | Format: { pit | tsc | cyclone | pmtmr } |
| 403 | |
Randy Dunlap | 3d6ac98 | 2007-05-23 13:58:16 -0700 | [diff] [blame] | 404 | clocksource= [GENERIC_TIME] Override the default clocksource |
| 405 | Format: <string> |
| 406 | Override the default clocksource and use the clocksource |
| 407 | with the name specified. |
| 408 | Some clocksource names to choose from, depending on |
| 409 | the platform: |
| 410 | [all] jiffies (this is the base, fallback clocksource) |
| 411 | [ACPI] acpi_pm |
| 412 | [ARM] imx_timer1,OSTS,netx_timer,mpu_timer2, |
| 413 | pxa_timer,timer3,32k_counter,timer0_1 |
| 414 | [AVR32] avr32 |
Alan Cox | cd4f0ef | 2007-07-31 00:37:59 -0700 | [diff] [blame] | 415 | [X86-32] pit,hpet,tsc,vmi-timer; |
Randy Dunlap | 3d6ac98 | 2007-05-23 13:58:16 -0700 | [diff] [blame] | 416 | scx200_hrt on Geode; cyclone on IBM x440 |
| 417 | [MIPS] MIPS |
| 418 | [PARISC] cr16 |
| 419 | [S390] tod |
| 420 | [SH] SuperH |
| 421 | [SPARC64] tick |
| 422 | [X86-64] hpet,tsc |
| 423 | |
Andi Kleen | ac72e78 | 2008-01-30 13:33:21 +0100 | [diff] [blame] | 424 | clearcpuid=BITNUM [X86] |
| 425 | Disable CPUID feature X for the kernel. See |
| 426 | include/asm-x86/cpufeature.h for the valid bit numbers. |
| 427 | Note the Linux specific bits are not necessarily |
| 428 | stable over kernel options, but the vendor specific |
| 429 | ones should be. |
| 430 | Also note that user programs calling CPUID directly |
| 431 | or using the feature without checking anything |
| 432 | will still see it. This just prevents it from |
| 433 | being used by the kernel or shown in /proc/cpuinfo. |
| 434 | Also note the kernel might malfunction if you disable |
| 435 | some critical bits. |
| 436 | |
Arjan van de Ven | a25bd94 | 2008-01-30 13:33:08 +0100 | [diff] [blame] | 437 | code_bytes [IA32/X86_64] How many bytes of object code to print |
| 438 | in an oops report. |
Chuck Ebbert | 86c4183 | 2007-02-13 13:26:25 +0100 | [diff] [blame] | 439 | Range: 0 - 8192 |
| 440 | Default: 64 |
| 441 | |
Andi Kleen | f9262c1 | 2006-03-08 17:57:25 -0800 | [diff] [blame] | 442 | disable_8254_timer |
| 443 | enable_8254_timer |
| 444 | [IA32/X86_64] Disable/Enable interrupt 0 timer routing |
| 445 | over the 8254 in addition to over the IO-APIC. The |
| 446 | kernel tries to set a sensible default. |
| 447 | |
Thomas Gleixner | b17530b | 2007-10-19 20:35:02 +0200 | [diff] [blame] | 448 | hpet= [X86-32,HPET] option to control HPET usage |
| 449 | Format: { enable (default) | disable | force } |
| 450 | disable: disable HPET and use PIT instead |
Carlos Corbacho | d79a5f8 | 2007-10-19 18:51:27 +0100 | [diff] [blame] | 451 | force: allow force enabled of undocumented chips (ICH4, |
| 452 | VIA, nVidia) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 453 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 454 | com20020= [HW,NET] ARCnet - COM20020 chipset |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 455 | Format: |
| 456 | <io>[,<irq>[,<nodeID>[,<backplane>[,<ckp>[,<timeout>]]]]] |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 457 | |
| 458 | com90io= [HW,NET] ARCnet - COM90xx chipset (IO-mapped buffers) |
| 459 | Format: <io>[,<irq>] |
| 460 | |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 461 | com90xx= [HW,NET] |
| 462 | ARCnet - COM90xx chipset (memory-mapped buffers) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 463 | Format: <io>[,<irq>[,<memstart>]] |
| 464 | |
| 465 | condev= [HW,S390] console device |
| 466 | conmode= |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 467 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 468 | console= [KNL] Output console device and options. |
| 469 | |
| 470 | tty<n> Use the virtual console device <n>. |
| 471 | |
| 472 | ttyS<n>[,options] |
Randy Dunlap | f1a1c2d | 2006-03-25 03:08:17 -0800 | [diff] [blame] | 473 | ttyUSB0[,options] |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 474 | Use the specified serial port. The options are of |
Randy Dunlap | f1a1c2d | 2006-03-25 03:08:17 -0800 | [diff] [blame] | 475 | the form "bbbbpnf", where "bbbb" is the baud rate, |
| 476 | "p" is parity ("n", "o", or "e"), "n" is number of |
| 477 | bits, and "f" is flow control ("r" for RTS or |
| 478 | omit it). Default is "9600n8". |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 479 | |
Randy Dunlap | f1a1c2d | 2006-03-25 03:08:17 -0800 | [diff] [blame] | 480 | See Documentation/serial-console.txt for more |
| 481 | information. See |
| 482 | Documentation/networking/netconsole.txt for an |
| 483 | alternative. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 484 | |
Yinghai Lu | 18a8bd9 | 2007-07-15 23:37:59 -0700 | [diff] [blame] | 485 | uart[8250],io,<addr>[,options] |
| 486 | uart[8250],mmio,<addr>[,options] |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 487 | Start an early, polled-mode console on the 8250/16550 |
| 488 | UART at the specified I/O port or MMIO address, |
| 489 | switching to the matching ttyS device later. The |
| 490 | options are the same as for ttyS, above. |
| 491 | |
Yinghai Lu | 18a8bd9 | 2007-07-15 23:37:59 -0700 | [diff] [blame] | 492 | earlycon= [KNL] Output early console device and options. |
| 493 | uart[8250],io,<addr>[,options] |
| 494 | uart[8250],mmio,<addr>[,options] |
| 495 | Start an early, polled-mode console on the 8250/16550 |
| 496 | UART at the specified I/O port or MMIO address. |
| 497 | The options are the same as for ttyS, above. |
| 498 | |
Andres Salomon | 8f4ce8c | 2007-10-18 03:04:50 -0700 | [diff] [blame] | 499 | no_console_suspend |
| 500 | [HW] Never suspend the console |
| 501 | Disable suspending of consoles during suspend and |
| 502 | hibernate operations. Once disabled, debugging |
| 503 | messages can reach various consoles while the rest |
| 504 | of the system is being put to sleep (ie, while |
| 505 | debugging driver suspend/resume hooks). This may |
| 506 | not work reliably with all consoles, but is known |
| 507 | to work with serial and VGA consoles. |
| 508 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 509 | cpcihp_generic= [HW,PCI] Generic port I/O CompactPCI driver |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 510 | Format: |
| 511 | <first_slot>,<last_slot>,<port>,<enum_bit>[,<debug>] |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 512 | |
Eric W. Biederman | dc009d9 | 2005-06-25 14:57:52 -0700 | [diff] [blame] | 513 | crashkernel=nn[KMG]@ss[KMG] |
| 514 | [KNL] Reserve a chunk of physical memory to |
| 515 | hold a kernel to switch to with kexec on panic. |
| 516 | |
Bernhard Walle | fb39159 | 2007-10-18 23:41:02 -0700 | [diff] [blame] | 517 | crashkernel=range1:size1[,range2:size2,...][@offset] |
| 518 | [KNL] Same as above, but depends on the memory |
| 519 | in the running system. The syntax of range is |
| 520 | start-[end] where start and end are both |
| 521 | a memory unit (amount[KMG]). See also |
| 522 | Documentation/kdump/kdump.txt for a example. |
| 523 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 524 | cs4232= [HW,OSS] |
| 525 | Format: <io>,<irq>,<dma>,<dma2>,<mpuio>,<mpuirq> |
| 526 | |
| 527 | cs89x0_dma= [HW,NET] |
| 528 | Format: <dma> |
| 529 | |
| 530 | cs89x0_media= [HW,NET] |
| 531 | Format: { rj45 | aui | bnc } |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 532 | |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 533 | dasd= [HW,NET] |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 534 | See header of drivers/s390/block/dasd_devmap.c. |
| 535 | |
| 536 | db9.dev[2|3]= [HW,JOY] Multisystem joystick support via parallel port |
| 537 | (one device per port) |
| 538 | Format: <port#>,<type> |
| 539 | See also Documentation/input/joystick-parport.txt |
| 540 | |
| 541 | debug [KNL] Enable kernel debugging (events log level). |
| 542 | |
Ingo Molnar | cae2ed9 | 2006-07-03 00:24:48 -0700 | [diff] [blame] | 543 | debug_locks_verbose= |
| 544 | [KNL] verbose self-tests |
| 545 | Format=<0|1> |
| 546 | Print debugging info while doing the locking API |
| 547 | self-tests. |
| 548 | We default to 0 (no extra messages), setting it to |
| 549 | 1 will print _a lot_ more information - normally |
| 550 | only useful to kernel developers. |
| 551 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 552 | decnet= [HW,NET] |
| 553 | Format: <area>[,<node>] |
| 554 | See also Documentation/networking/decnet.txt. |
| 555 | |
Samuel Thibault | ecb77fa | 2008-01-03 16:17:54 +0000 | [diff] [blame] | 556 | vt.default_blu= [VT] |
Antonino A. Daplas | 55ff978 | 2007-05-08 00:38:53 -0700 | [diff] [blame] | 557 | Format: <blue0>,<blue1>,<blue2>,...,<blue15> |
| 558 | Change the default blue palette of the console. |
| 559 | This is a 16-member array composed of values |
| 560 | ranging from 0-255. |
| 561 | |
Samuel Thibault | ecb77fa | 2008-01-03 16:17:54 +0000 | [diff] [blame] | 562 | vt.default_grn= [VT] |
Antonino A. Daplas | 55ff978 | 2007-05-08 00:38:53 -0700 | [diff] [blame] | 563 | Format: <green0>,<green1>,<green2>,...,<green15> |
| 564 | Change the default green palette of the console. |
| 565 | This is a 16-member array composed of values |
| 566 | ranging from 0-255. |
| 567 | |
Samuel Thibault | ecb77fa | 2008-01-03 16:17:54 +0000 | [diff] [blame] | 568 | vt.default_red= [VT] |
Antonino A. Daplas | 55ff978 | 2007-05-08 00:38:53 -0700 | [diff] [blame] | 569 | Format: <red0>,<red1>,<red2>,...,<red15> |
| 570 | Change the default red palette of the console. |
| 571 | This is a 16-member array composed of values |
| 572 | ranging from 0-255. |
| 573 | |
Samuel Thibault | ecb77fa | 2008-01-03 16:17:54 +0000 | [diff] [blame] | 574 | vt.default_utf8= |
| 575 | [VT] |
Antonino A. Daplas | 55ff978 | 2007-05-08 00:38:53 -0700 | [diff] [blame] | 576 | Format=<0|1> |
| 577 | Set system-wide default UTF-8 mode for all tty's. |
Samuel Thibault | ecb77fa | 2008-01-03 16:17:54 +0000 | [diff] [blame] | 578 | Default is 1, i.e. UTF-8 mode is enabled for all |
| 579 | newly opened terminals. |
Antonino A. Daplas | 55ff978 | 2007-05-08 00:38:53 -0700 | [diff] [blame] | 580 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 581 | dhash_entries= [KNL] |
| 582 | Set number of hash buckets for dentry cache. |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 583 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 584 | digi= [HW,SERIAL] |
| 585 | IO parameters + enable/disable command. |
| 586 | |
| 587 | digiepca= [HW,SERIAL] |
| 588 | See drivers/char/README.epca and |
| 589 | Documentation/digiepca.txt. |
| 590 | |
Yinghai Lu | 093af8d | 2008-01-30 13:33:32 +0100 | [diff] [blame] | 591 | disable_mtrr_trim [X86, Intel and AMD only] |
Jesse Barnes | 99fc8d4 | 2008-01-30 13:33:18 +0100 | [diff] [blame] | 592 | By default the kernel will trim any uncacheable |
| 593 | memory out of your available memory pool based on |
| 594 | MTRR settings. This parameter disables that behavior, |
| 595 | possibly causing your machine to run very slowly. |
| 596 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 597 | dmasound= [HW,OSS] Sound subsystem buffers |
| 598 | |
| 599 | dscc4.setup= [NET] |
| 600 | |
| 601 | dtc3181e= [HW,SCSI] |
| 602 | |
Robin Getz | 0ae5364 | 2007-10-09 17:24:49 +0800 | [diff] [blame] | 603 | earlyprintk= [X86-32,X86-64,SH,BLACKFIN] |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 604 | earlyprintk=vga |
| 605 | earlyprintk=serial[,ttySn[,baudrate]] |
| 606 | |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 607 | Append ",keep" to not disable it when the real console |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 608 | takes over. |
| 609 | |
| 610 | Only vga or serial at a time, not both. |
| 611 | |
| 612 | Currently only ttyS0 and ttyS1 are supported. |
| 613 | |
| 614 | Interaction with the standard serial driver is not |
| 615 | very good. |
| 616 | |
| 617 | The VGA output is eventually overwritten by the real |
| 618 | console. |
| 619 | |
| 620 | eata= [HW,SCSI] |
| 621 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 622 | edd= [EDD] |
| 623 | Format: {"of[f]" | "sk[ipmbr]"} |
| 624 | See comment in arch/i386/boot/edd.S |
| 625 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 626 | eisa_irq_edge= [PARISC,HW] |
| 627 | See header of drivers/parisc/eisa.c. |
| 628 | |
Alan Cox | cd4f0ef | 2007-07-31 00:37:59 -0700 | [diff] [blame] | 629 | elanfreq= [X86-32] |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 630 | See comment before function elanfreq_setup() in |
| 631 | arch/i386/kernel/cpu/cpufreq/elanfreq.c. |
| 632 | |
| 633 | elevator= [IOSCHED] |
Randy Dunlap | 16ab3ad | 2006-01-14 13:21:20 -0800 | [diff] [blame] | 634 | Format: {"anticipatory" | "cfq" | "deadline" | "noop"} |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 635 | See Documentation/block/as-iosched.txt and |
| 636 | Documentation/block/deadline-iosched.txt for details. |
| 637 | |
Alan Cox | cd4f0ef | 2007-07-31 00:37:59 -0700 | [diff] [blame] | 638 | elfcorehdr= [X86-32, X86_64] |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 639 | Specifies physical address of start of kernel core |
Vivek Goyal | aac04b3 | 2006-01-09 20:51:47 -0800 | [diff] [blame] | 640 | image elf header. Generally kexec loader will |
| 641 | pass this option to capture kernel. |
| 642 | See Documentation/kdump/kdump.txt for details. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 643 | |
| 644 | enforcing [SELINUX] Set initial enforcing status. |
| 645 | Format: {"0" | "1"} |
| 646 | See security/selinux/Kconfig help text. |
| 647 | 0 -- permissive (log only, no denials). |
| 648 | 1 -- enforcing (deny and log). |
| 649 | Default value is 0. |
| 650 | Value can be changed at runtime via /selinux/enforce. |
| 651 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 652 | es1371= [HW,OSS] |
| 653 | Format: <spdif>,[<nomix>,[<amplifier>]] |
| 654 | See also header of sound/oss/es1371.c. |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 655 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 656 | ether= [HW,NET] Ethernet cards parameters |
| 657 | This option is obsoleted by the "netdev=" option, which |
| 658 | has equivalent usage. See its documentation for details. |
| 659 | |
| 660 | eurwdt= [HW,WDT] Eurotech CPU-1220/1410 onboard watchdog. |
| 661 | Format: <io>[,<irq>] |
| 662 | |
Akinobu Mita | de1ba09 | 2006-12-08 02:39:42 -0800 | [diff] [blame] | 663 | failslab= |
| 664 | fail_page_alloc= |
| 665 | fail_make_request=[KNL] |
| 666 | General fault injection mechanism. |
| 667 | Format: <interval>,<probability>,<space>,<times> |
| 668 | See also /Documentation/fault-injection/. |
| 669 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 670 | fd_mcs= [HW,SCSI] |
| 671 | See header of drivers/scsi/fd_mcs.c. |
| 672 | |
| 673 | fdomain= [HW,SCSI] |
| 674 | See header of drivers/scsi/fdomain.c. |
| 675 | |
| 676 | floppy= [HW] |
| 677 | See Documentation/floppy.txt. |
| 678 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 679 | gamecon.map[2|3]= |
| 680 | [HW,JOY] Multisystem joystick and NES/SNES/PSX pad |
| 681 | support via parallel port (up to 5 devices per port) |
| 682 | Format: <port#>,<pad1>,<pad2>,<pad3>,<pad4>,<pad5> |
| 683 | See also Documentation/input/joystick-parport.txt |
| 684 | |
| 685 | gamma= [HW,DRM] |
| 686 | |
Yinghai Lu | aaf2304 | 2008-01-30 13:33:09 +0100 | [diff] [blame] | 687 | gart_fix_e820= [X86_64] disable the fix e820 for K8 GART |
| 688 | Format: off | on |
| 689 | default: on |
| 690 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 691 | gdth= [HW,SCSI] |
| 692 | See header of drivers/scsi/gdth.c. |
| 693 | |
| 694 | gpt [EFI] Forces disk with valid GPT signature but |
| 695 | invalid Protective MBR to be treated as GPT. |
| 696 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 697 | gvp11= [HW,SCSI] |
| 698 | |
| 699 | hashdist= [KNL,NUMA] Large hashes allocated during boot |
| 700 | are distributed across NUMA nodes. Defaults on |
| 701 | for IA-64, off otherwise. |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 702 | Format: 0 | 1 (for off | on) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 703 | |
| 704 | hcl= [IA-64] SGI's Hardware Graph compatibility layer |
| 705 | |
| 706 | hd= [EIDE] (E)IDE hard drive subsystem geometry |
| 707 | Format: <cyl>,<head>,<sect> |
| 708 | |
| 709 | hd?= [HW] (E)IDE subsystem |
| 710 | hd?lun= See Documentation/ide.txt. |
| 711 | |
| 712 | highmem=nn[KMG] [KNL,BOOT] forces the highmem zone to have an exact |
| 713 | size of <nn>. This works even on boxes that have no |
| 714 | highmem otherwise. This also works to reduce highmem |
| 715 | size on bigger boxes. |
| 716 | |
Thomas Gleixner | 54cdfdb | 2007-02-16 01:28:11 -0800 | [diff] [blame] | 717 | highres= [KNL] Enable/disable high resolution timer mode. |
| 718 | Valid parameters: "on", "off" |
| 719 | Default: "on" |
| 720 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 721 | hisax= [HW,ISDN] |
| 722 | See Documentation/isdn/README.HiSax. |
| 723 | |
Alan Cox | cd4f0ef | 2007-07-31 00:37:59 -0700 | [diff] [blame] | 724 | hugepages= [HW,X86-32,IA-64] Maximal number of HugeTLB pages. |
Jon Tollefson | 4ec161c | 2008-01-04 09:59:50 +1100 | [diff] [blame] | 725 | hugepagesz= [HW,IA-64,PPC] The size of the HugeTLB pages. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 726 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 727 | i8042.direct [HW] Put keyboard port into non-translated mode |
Matt LaPlante | 84eb8d0 | 2006-10-03 22:53:09 +0200 | [diff] [blame] | 728 | i8042.dumbkbd [HW] Pretend that controller can only read data from |
| 729 | keyboard and cannot control its state |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 730 | (Don't attempt to blink the leds) |
| 731 | i8042.noaux [HW] Don't check for auxiliary (== mouse) port |
Dmitry Torokhov | 945ef0d | 2005-09-04 01:42:00 -0500 | [diff] [blame] | 732 | i8042.nokbd [HW] Don't check/create keyboard port |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 733 | i8042.nomux [HW] Don't check presence of an active multiplexing |
| 734 | controller |
| 735 | i8042.nopnp [HW] Don't use ACPIPnP / PnPBIOS to discover KBD/AUX |
| 736 | controllers |
| 737 | i8042.panicblink= |
| 738 | [HW] Frequency with which keyboard LEDs should blink |
| 739 | when kernel panics (default is 0.5 sec) |
| 740 | i8042.reset [HW] Reset the controller during init and cleanup |
| 741 | i8042.unlock [HW] Unlock (ignore) the keylock |
| 742 | |
| 743 | i810= [HW,DRM] |
| 744 | |
Dmitry Torokhov | e70c9d5 | 2005-06-25 14:54:25 -0700 | [diff] [blame] | 745 | i8k.ignore_dmi [HW] Continue probing hardware even if DMI data |
| 746 | indicates that the driver is running on unsupported |
| 747 | hardware. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 748 | i8k.force [HW] Activate i8k driver even if SMM BIOS signature |
| 749 | does not match list of supported models. |
| 750 | i8k.power_status |
| 751 | [HW] Report power status in /proc/i8k |
| 752 | (disabled by default) |
| 753 | i8k.restricted [HW] Allow controlling fans only if SYS_ADMIN |
| 754 | capability is set. |
| 755 | |
| 756 | ibmmcascsi= [HW,MCA,SCSI] IBM MicroChannel SCSI adapter |
| 757 | See Documentation/mca.txt. |
| 758 | |
| 759 | icn= [HW,ISDN] |
| 760 | Format: <io>[,<membase>[,<icn_id>[,<icn_id2>]]] |
| 761 | |
| 762 | ide= [HW] (E)IDE subsystem |
| 763 | Format: ide=nodma or ide=doubler or ide=reverse |
| 764 | See Documentation/ide.txt. |
| 765 | |
| 766 | ide?= [HW] (E)IDE subsystem |
| 767 | Format: ide?=noprobe or chipset specific parameters. |
| 768 | See Documentation/ide.txt. |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 769 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 770 | idebus= [HW] (E)IDE subsystem - VLB/PCI bus speed |
| 771 | See Documentation/ide.txt. |
| 772 | |
Andi Kleen | f039b75 | 2007-05-02 19:27:12 +0200 | [diff] [blame] | 773 | idle= [X86] |
| 774 | Format: idle=poll or idle=mwait |
| 775 | Poll forces a polling idle loop that can slightly improves the performance |
| 776 | of waking up a idle CPU, but will use a lot of power and make the system |
| 777 | run hot. Not recommended. |
| 778 | idle=mwait. On systems which support MONITOR/MWAIT but the kernel chose |
| 779 | to not use it because it doesn't save as much power as a normal idle |
| 780 | loop use the MONITOR/MWAIT idle loop anyways. Performance should be the same |
| 781 | as idle=poll. |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 782 | |
Ingo Molnar | 79290822 | 2006-12-06 20:40:51 -0800 | [diff] [blame] | 783 | ignore_loglevel [KNL] |
| 784 | Ignore loglevel setting - this will print /all/ |
| 785 | kernel messages to the console. Useful for debugging. |
| 786 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 787 | ihash_entries= [KNL] |
| 788 | Set number of hash buckets for inode cache. |
| 789 | |
| 790 | in2000= [HW,SCSI] |
| 791 | See header of drivers/scsi/in2000.c. |
| 792 | |
| 793 | init= [KNL] |
| 794 | Format: <full_path> |
| 795 | Run specified binary instead of /sbin/init as init |
| 796 | process. |
| 797 | |
| 798 | initcall_debug [KNL] Trace initcalls as they are executed. Useful |
| 799 | for working out where the kernel is dying during |
| 800 | startup. |
| 801 | |
| 802 | initrd= [BOOT] Specify the location of the initial ramdisk |
| 803 | |
| 804 | inport.irq= [HW] Inport (ATI XL and Microsoft) busmouse driver |
| 805 | Format: <irq> |
| 806 | |
| 807 | inttest= [IA64] |
| 808 | |
Keshavamurthy, Anil S | ba39592 | 2007-10-21 16:41:49 -0700 | [diff] [blame] | 809 | intel_iommu= [DMAR] Intel IOMMU driver (DMAR) option |
| 810 | off |
| 811 | Disable intel iommu driver. |
| 812 | igfx_off [Default Off] |
| 813 | By default, gfx is mapped as normal device. If a gfx |
| 814 | device has a dedicated DMAR unit, the DMAR unit is |
| 815 | bypassed by not enabling DMAR with this option. In |
| 816 | this case, gfx device will use physical address for |
| 817 | DMA. |
Keshavamurthy, Anil S | 7d3b03c | 2007-10-21 16:41:53 -0700 | [diff] [blame] | 818 | forcedac [x86_64] |
| 819 | With this option iommu will not optimize to look |
| 820 | for io virtual address below 32 bit forcing dual |
| 821 | address cycle on pci bus for cards supporting greater |
| 822 | than 32 bit addressing. The default is to look |
| 823 | for translation below 32 bit and if not available |
| 824 | then look in the higher range. |
Keshavamurthy, Anil S | ba39592 | 2007-10-21 16:41:49 -0700 | [diff] [blame] | 825 | |
Rene Herman | b02aae9 | 2008-01-30 13:30:05 +0100 | [diff] [blame] | 826 | io_delay= [X86-32,X86-64] I/O delay method |
Ingo Molnar | 6e7c402 | 2008-01-30 13:30:05 +0100 | [diff] [blame] | 827 | 0x80 |
| 828 | Standard port 0x80 based delay |
| 829 | 0xed |
| 830 | Alternate port 0xed based delay (needed on some systems) |
Rene Herman | b02aae9 | 2008-01-30 13:30:05 +0100 | [diff] [blame] | 831 | udelay |
Ingo Molnar | 6e7c402 | 2008-01-30 13:30:05 +0100 | [diff] [blame] | 832 | Simple two microseconds delay |
| 833 | none |
| 834 | No delay |
Rene Herman | b02aae9 | 2008-01-30 13:30:05 +0100 | [diff] [blame] | 835 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 836 | io7= [HW] IO7 for Marvel based alpha systems |
| 837 | See comment before marvel_specify_io7 in |
| 838 | arch/alpha/kernel/core_marvel.c. |
| 839 | |
| 840 | ip= [IP_PNP] |
| 841 | See Documentation/nfsroot.txt. |
| 842 | |
| 843 | ip2= [HW] Set IO/IRQ pairs for up to 4 IntelliPort boards |
Randy Dunlap | c8facbb | 2007-07-31 00:37:40 -0700 | [diff] [blame] | 844 | See comment before ip2_setup() in |
| 845 | drivers/char/ip2/ip2base.c. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 846 | |
| 847 | ips= [HW,SCSI] Adaptec / IBM ServeRAID controller |
| 848 | See header of drivers/scsi/ips.c. |
| 849 | |
Simon Horman | 72c4a13 | 2006-09-13 19:57:18 -0700 | [diff] [blame] | 850 | ports= [IP_VS_FTP] IPVS ftp helper module |
| 851 | Default is 21. |
| 852 | Up to 8 (IP_VS_APP_MAX_PORTS) ports |
| 853 | may be specified. |
| 854 | Format: <port>,<port>.... |
| 855 | |
Alan Cox | 200803d | 2005-06-28 20:45:18 -0700 | [diff] [blame] | 856 | irqfixup [HW] |
| 857 | When an interrupt is not handled search all handlers |
| 858 | for it. Intended to get systems with badly broken |
| 859 | firmware running. |
| 860 | |
| 861 | irqpoll [HW] |
| 862 | When an interrupt is not handled search all handlers |
| 863 | for it. Also check all handlers each timer |
| 864 | interrupt. Intended to get systems with badly broken |
| 865 | firmware running. |
| 866 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 867 | isapnp= [ISAPNP] |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 868 | Format: <RDP>,<reset>,<pci_scan>,<verbosity> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 869 | |
| 870 | isolcpus= [KNL,SMP] Isolate CPUs from the general scheduler. |
Derek Fults | 22f2e28 | 2006-12-06 20:37:11 -0800 | [diff] [blame] | 871 | Format: |
| 872 | <cpu number>,...,<cpu number> |
| 873 | or |
| 874 | <cpu number>-<cpu number> (must be a positive range in ascending order) |
| 875 | or a mixture |
| 876 | <cpu number>,...,<cpu number>-<cpu number> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 877 | This option can be used to specify one or more CPUs |
| 878 | to isolate from the general SMP balancing and scheduling |
| 879 | algorithms. The only way to move a process onto or off |
| 880 | an "isolated" CPU is via the CPU affinity syscalls. |
| 881 | <cpu number> begins at 0 and the maximum value is |
| 882 | "number of CPUs in system - 1". |
| 883 | |
| 884 | This option is the preferred way to isolate CPUs. The |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 885 | alternative -- manually setting the CPU mask of all |
| 886 | tasks in the system -- can cause problems and |
| 887 | suboptimal load balancer performance. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 888 | |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 889 | iucv= [HW,NET] |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 890 | |
| 891 | js= [HW,JOY] Analog joystick |
| 892 | See Documentation/input/joystick.txt. |
| 893 | |
Alan Cox | cd4f0ef | 2007-07-31 00:37:59 -0700 | [diff] [blame] | 894 | 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] | 895 | specifies the amount of memory usable by the kernel |
| 896 | for non-movable allocations. The requested amount is |
| 897 | spread evenly throughout all nodes in the system. The |
| 898 | remaining memory in each node is used for Movable |
| 899 | pages. In the event, a node is too small to have both |
| 900 | kernelcore and Movable pages, kernelcore pages will |
| 901 | take priority and other nodes will have a larger number |
| 902 | of kernelcore pages. The Movable zone is used for the |
| 903 | allocation of pages that may be reclaimed or moved |
| 904 | by the page migration subsystem. This means that |
| 905 | HugeTLB pages may not be allocated from this zone. |
| 906 | Note that allocations like PTEs-from-HighMem still |
| 907 | use the HighMem zone if it exists, and the Normal |
| 908 | zone if it does not. |
| 909 | |
Alan Cox | cd4f0ef | 2007-07-31 00:37:59 -0700 | [diff] [blame] | 910 | 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] | 911 | is similar to kernelcore except it specifies the |
| 912 | amount of memory used for migratable allocations. |
| 913 | If both kernelcore and movablecore is specified, |
| 914 | then kernelcore will be at *least* the specified |
| 915 | value but may be more. If movablecore on its own |
| 916 | is specified, the administrator must be careful |
| 917 | that the amount of memory usable for all allocations |
| 918 | is not too small. |
| 919 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 920 | keepinitrd [HW,ARM] |
| 921 | |
Alan Cox | cd4f0ef | 2007-07-31 00:37:59 -0700 | [diff] [blame] | 922 | 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] | 923 | in oops dumps. |
| 924 | |
| 925 | l2cr= [PPC] |
| 926 | |
Alan Cox | cd4f0ef | 2007-07-31 00:37:59 -0700 | [diff] [blame] | 927 | lapic [X86-32,APIC] Enable the local APIC even if BIOS |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 928 | disabled it. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 929 | |
Alan Cox | cd4f0ef | 2007-07-31 00:37:59 -0700 | [diff] [blame] | 930 | 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] | 931 | C2 power state. |
| 932 | |
FD Cami | fcb71f6 | 2008-01-06 19:08:56 +0100 | [diff] [blame] | 933 | libata.dma= [LIBATA] DMA control |
| 934 | libata.dma=0 Disable all PATA and SATA DMA |
| 935 | libata.dma=1 PATA and SATA Disk DMA only |
| 936 | libata.dma=2 ATAPI (CDROM) DMA only |
| 937 | libata.dma=4 Compact Flash DMA only |
| 938 | Combinations also work, so libata.dma=3 enables DMA |
| 939 | for disks and CDROMs, but not CFs. |
| 940 | |
Dave Jones | 78e70c2 | 2007-09-27 11:50:13 -0400 | [diff] [blame] | 941 | libata.noacpi [LIBATA] Disables use of ACPI in libata suspend/resume |
| 942 | when set. |
| 943 | Format: <int> |
| 944 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 945 | load_ramdisk= [RAM] List of ramdisks to load from floppy |
| 946 | See Documentation/ramdisk.txt. |
| 947 | |
Randy Dunlap | a6b25b6 | 2006-01-14 13:21:19 -0800 | [diff] [blame] | 948 | lockd.nlm_grace_period=P [NFS] Assign grace period. |
| 949 | Format: <integer> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 950 | |
Randy Dunlap | a6b25b6 | 2006-01-14 13:21:19 -0800 | [diff] [blame] | 951 | lockd.nlm_tcpport=N [NFS] Assign TCP port. |
| 952 | Format: <integer> |
| 953 | |
| 954 | lockd.nlm_timeout=T [NFS] Assign timeout value. |
| 955 | Format: <integer> |
| 956 | |
| 957 | lockd.nlm_udpport=M [NFS] Assign UDP port. |
| 958 | Format: <integer> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 959 | |
| 960 | logibm.irq= [HW,MOUSE] Logitech Bus Mouse Driver |
| 961 | Format: <irq> |
| 962 | |
| 963 | loglevel= All Kernel Messages with a loglevel smaller than the |
| 964 | console loglevel will be printed to the console. It can |
| 965 | also be changed with klogd or other programs. The |
| 966 | loglevels are defined as follows: |
| 967 | |
| 968 | 0 (KERN_EMERG) system is unusable |
| 969 | 1 (KERN_ALERT) action must be taken immediately |
| 970 | 2 (KERN_CRIT) critical conditions |
| 971 | 3 (KERN_ERR) error conditions |
| 972 | 4 (KERN_WARNING) warning conditions |
| 973 | 5 (KERN_NOTICE) normal but significant condition |
| 974 | 6 (KERN_INFO) informational |
| 975 | 7 (KERN_DEBUG) debug-level messages |
| 976 | |
| 977 | 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] | 978 | Format: { n | nk | nM } |
| 979 | n must be a power of two. The default size |
| 980 | is set in the kernel config file. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 981 | |
Randy Dunlap | accaa24 | 2007-10-16 01:29:37 -0700 | [diff] [blame] | 982 | logo.nologo [FB] Disables display of the built-in Linux logo. |
| 983 | This may be used to provide more screen space for |
| 984 | kernel log messages and is useful when debugging |
| 985 | kernel boot problems. |
| 986 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 987 | lp=0 [LP] Specify parallel ports to use, e.g, |
| 988 | lp=port[,port...] lp=none,parport0 (lp0 not configured, lp1 uses |
| 989 | lp=reset first parallel port). 'lp=0' disables the |
| 990 | lp=auto printer driver. 'lp=reset' (which can be |
| 991 | specified in addition to the ports) causes |
| 992 | attached printers to be reset. Using |
| 993 | lp=port1,port2,... specifies the parallel ports |
| 994 | to associate lp devices with, starting with |
| 995 | lp0. A port specification may be 'none' to skip |
| 996 | that lp device, or a parport name such as |
| 997 | 'parport0'. Specifying 'lp=auto' instead of a |
| 998 | port specification list means that device IDs |
| 999 | from each port should be examined, to see if |
| 1000 | an IEEE 1284-compliant printer is attached; if |
| 1001 | so, the driver will manage that printer. |
| 1002 | See also header of drivers/char/lp.c. |
| 1003 | |
| 1004 | lpj=n [KNL] |
| 1005 | Sets loops_per_jiffy to given constant, thus avoiding |
| 1006 | time-consuming boot-time autodetection (up to 250 ms per |
| 1007 | CPU). 0 enables autodetection (default). To determine |
| 1008 | the correct value for your kernel, boot with normal |
| 1009 | autodetection and see what value is printed. Note that |
| 1010 | on SMP systems the preset will be applied to all CPUs, |
| 1011 | which is likely to cause problems if your CPUs need |
| 1012 | significantly divergent settings. An incorrect value |
| 1013 | will cause delays in the kernel to be wrong, leading to |
| 1014 | unpredictable I/O errors and other breakage. Although |
| 1015 | unlikely, in the extreme case this might damage your |
| 1016 | hardware. |
| 1017 | |
| 1018 | ltpc= [NET] |
| 1019 | Format: <io>,<irq>,<dma> |
| 1020 | |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 1021 | mac5380= [HW,SCSI] Format: |
| 1022 | <can_queue>,<cmd_per_lun>,<sg_tablesize>,<hostid>,<use_tags> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1023 | |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 1024 | mac53c9x= [HW,SCSI] Format: |
| 1025 | <num_esps>,<disconnect>,<nosync>,<can_queue>,<cmd_per_lun>,<sg_tablesize>,<hostid>,<use_tags> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1026 | |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 1027 | machvec= [IA64] Force the use of a particular machine-vector |
| 1028 | (machvec) in a generic kernel. |
| 1029 | Example: machvec=hpzx1_swiotlb |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1030 | |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 1031 | max_loop= [LOOP] Maximum number of loopback devices that can |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1032 | be mounted |
| 1033 | Format: <1-256> |
| 1034 | |
| 1035 | maxcpus= [SMP] Maximum number of processors that an SMP kernel |
Len Brown | 61ec756 | 2007-08-16 03:34:22 -0400 | [diff] [blame] | 1036 | should make use of. maxcpus=n : n >= 0 limits the |
| 1037 | kernel to using 'n' processors. n=0 is a special case, |
| 1038 | it is equivalent to "nosmp", which also disables |
| 1039 | the IO APIC. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1040 | |
Bob Picco | 2b2c375 | 2005-06-29 18:00:00 -0700 | [diff] [blame] | 1041 | max_addr=[KMG] [KNL,BOOT,ia64] All physical memory greater than or |
| 1042 | equal to this physical address is ignored. |
| 1043 | |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 1044 | max_luns= [SCSI] Maximum number of LUNs to probe. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1045 | Should be between 1 and 2^32-1. |
| 1046 | |
| 1047 | max_report_luns= |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 1048 | [SCSI] Maximum number of LUNs received. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1049 | Should be between 1 and 16384. |
| 1050 | |
Alan Cox | cd4f0ef | 2007-07-31 00:37:59 -0700 | [diff] [blame] | 1051 | mca-pentium [BUGS=X86-32] |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1052 | |
| 1053 | mcatest= [IA-64] |
| 1054 | |
Alan Cox | cd4f0ef | 2007-07-31 00:37:59 -0700 | [diff] [blame] | 1055 | mce [X86-32] Machine Check Exception |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1056 | |
Andi Kleen | 909dd32 | 2007-10-17 18:04:38 +0200 | [diff] [blame] | 1057 | mce=option [X86-64] See Documentation/x86_64/boot-options.txt |
| 1058 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1059 | md= [HW] RAID subsystems devices and level |
| 1060 | See Documentation/md.txt. |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 1061 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1062 | mdacon= [MDA] |
| 1063 | Format: <first>,<last> |
| 1064 | Specifies range of consoles to be captured by the MDA. |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 1065 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1066 | mem=nn[KMG] [KNL,BOOT] Force usage of a specific amount of memory |
| 1067 | Amount of memory to be used when the kernel is not able |
| 1068 | to see the whole system memory or for test. |
Alan Cox | cd4f0ef | 2007-07-31 00:37:59 -0700 | [diff] [blame] | 1069 | [X86-32] Use together with memmap= to avoid physical |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1070 | address space collisions. Without memmap= PCI devices |
| 1071 | could be placed at addresses belonging to unused RAM. |
| 1072 | |
Alan Cox | cd4f0ef | 2007-07-31 00:37:59 -0700 | [diff] [blame] | 1073 | mem=nopentium [BUGS=X86-32] Disable usage of 4MB pages for kernel |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1074 | memory. |
| 1075 | |
Alan Cox | cd4f0ef | 2007-07-31 00:37:59 -0700 | [diff] [blame] | 1076 | memmap=exactmap [KNL,X86-32,X86_64] Enable setting of an exact |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1077 | E820 memory map, as specified by the user. |
| 1078 | Such memmap=exactmap lines can be constructed based on |
| 1079 | BIOS output or other requirements. See the memmap=nn@ss |
| 1080 | option description. |
| 1081 | |
| 1082 | memmap=nn[KMG]@ss[KMG] |
| 1083 | [KNL] Force usage of a specific region of memory |
| 1084 | Region of memory to be used, from ss to ss+nn. |
| 1085 | |
| 1086 | memmap=nn[KMG]#ss[KMG] |
| 1087 | [KNL,ACPI] Mark specific memory as ACPI data. |
| 1088 | Region of memory to be used, from ss to ss+nn. |
| 1089 | |
| 1090 | memmap=nn[KMG]$ss[KMG] |
| 1091 | [KNL,ACPI] Mark specific memory as reserved. |
| 1092 | Region of memory to be used, from ss to ss+nn. |
| 1093 | |
| 1094 | meye.*= [HW] Set MotionEye Camera parameters |
| 1095 | See Documentation/video4linux/meye.txt. |
| 1096 | |
Andres Salomon | 8f36881 | 2007-10-12 23:04:06 +0200 | [diff] [blame] | 1097 | mfgpt_irq= [IA-32] Specify the IRQ to use for the |
| 1098 | Multi-Function General Purpose Timers on AMD Geode |
| 1099 | platforms. |
| 1100 | |
Willy Tarreau | e6c4dc6 | 2008-01-30 13:33:33 +0100 | [diff] [blame] | 1101 | mfgptfix [X86-32] Fix MFGPT timers on AMD Geode platforms when |
| 1102 | the BIOS has incorrectly applied a workaround. TinyBIOS |
| 1103 | version 0.98 is known to be affected, 0.99 fixes the |
| 1104 | problem by letting the user disable the workaround. |
| 1105 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1106 | mga= [HW,DRM] |
| 1107 | |
| 1108 | mousedev.tap_time= |
| 1109 | [MOUSE] Maximum time between finger touching and |
| 1110 | leaving touchpad surface for touch to be considered |
| 1111 | a tap and be reported as a left button click (for |
| 1112 | touchpads working in absolute mode only). |
| 1113 | Format: <msecs> |
| 1114 | mousedev.xres= [MOUSE] Horizontal screen resolution, used for devices |
| 1115 | reporting absolute coordinates, such as tablets |
| 1116 | mousedev.yres= [MOUSE] Vertical screen resolution, used for devices |
| 1117 | reporting absolute coordinates, such as tablets |
| 1118 | |
| 1119 | mpu401= [HW,OSS] |
| 1120 | Format: <io>,<irq> |
| 1121 | |
| 1122 | MTD_Partition= [MTD] |
| 1123 | Format: <name>,<region-number>,<size>,<offset> |
| 1124 | |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 1125 | MTD_Region= [MTD] Format: |
| 1126 | <name>,<region-number>[,<base>,<size>,<buswidth>,<altbuswidth>] |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1127 | |
| 1128 | mtdparts= [MTD] |
Randy Dunlap | c8facbb | 2007-07-31 00:37:40 -0700 | [diff] [blame] | 1129 | See drivers/mtd/cmdlinepart.c. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1130 | |
| 1131 | mtouchusb.raw_coordinates= |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 1132 | [HW] Make the MicroTouch USB driver use raw coordinates |
| 1133 | ('y', default) or cooked coordinates ('n') |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1134 | |
| 1135 | n2= [NET] SDL Inc. RISCom/N2 synchronous serial card |
| 1136 | |
| 1137 | NCR_D700= [HW,SCSI] |
| 1138 | See header of drivers/scsi/NCR_D700.c. |
| 1139 | |
| 1140 | ncr5380= [HW,SCSI] |
| 1141 | |
| 1142 | ncr53c400= [HW,SCSI] |
| 1143 | |
| 1144 | ncr53c400a= [HW,SCSI] |
| 1145 | |
| 1146 | ncr53c406a= [HW,SCSI] |
| 1147 | |
| 1148 | ncr53c8xx= [HW,SCSI] |
| 1149 | |
| 1150 | netdev= [NET] Network devices parameters |
| 1151 | Format: <irq>,<io>,<mem_start>,<mem_end>,<name> |
| 1152 | Note that mem_start is often overloaded to mean |
| 1153 | something different and driver-specific. |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 1154 | This usage is only documented in each driver source |
| 1155 | file if at all. |
| 1156 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1157 | nfsaddrs= [NFS] |
| 1158 | See Documentation/nfsroot.txt. |
| 1159 | |
| 1160 | nfsroot= [NFS] nfs root filesystem for disk-less boxes. |
| 1161 | See Documentation/nfsroot.txt. |
| 1162 | |
Trond Myklebust | a72b442 | 2006-01-03 09:55:41 +0100 | [diff] [blame] | 1163 | nfs.callback_tcpport= |
| 1164 | [NFS] set the TCP port on which the NFSv4 callback |
| 1165 | channel should listen. |
| 1166 | |
Trond Myklebust | 58df095 | 2006-01-03 09:55:57 +0100 | [diff] [blame] | 1167 | nfs.idmap_cache_timeout= |
| 1168 | [NFS] set the maximum lifetime for idmapper cache |
| 1169 | entries. |
| 1170 | |
Trond Myklebust | f43bf0b | 2007-10-09 12:01:04 -0400 | [diff] [blame] | 1171 | nfs.enable_ino64= |
| 1172 | [NFS] enable 64-bit inode numbers. |
| 1173 | If zero, the NFS client will fake up a 32-bit inode |
| 1174 | number for the readdir() and stat() syscalls instead |
| 1175 | of returning the full 64-bit number. |
| 1176 | The default is to return 64-bit inode numbers. |
| 1177 | |
Haavard Skinnemoen | e7ba176 | 2007-10-10 14:58:29 +0200 | [diff] [blame] | 1178 | nmi_debug= [KNL,AVR32] Specify one or more actions to take |
| 1179 | when a NMI is triggered. |
| 1180 | Format: [state][,regs][,debounce][,die] |
| 1181 | |
Alan Cox | cd4f0ef | 2007-07-31 00:37:59 -0700 | [diff] [blame] | 1182 | nmi_watchdog= [KNL,BUGS=X86-32] Debugging features for SMP kernels |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1183 | |
Alan Cox | cd4f0ef | 2007-07-31 00:37:59 -0700 | [diff] [blame] | 1184 | no387 [BUGS=X86-32] Tells the kernel to use the 387 maths |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1185 | emulation library even if a 387 maths coprocessor |
| 1186 | is present. |
| 1187 | |
Christoph Lameter | c1aee21 | 2007-05-31 00:40:47 -0700 | [diff] [blame] | 1188 | noaliencache [MM, NUMA, SLAB] Disables the allocation of alien |
| 1189 | caches in the slab allocator. Saves per-node memory, |
| 1190 | but will impact performance. |
Paul Menage | 3395ee0 | 2006-12-06 20:32:16 -0800 | [diff] [blame] | 1191 | |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 1192 | noalign [KNL,ARM] |
| 1193 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1194 | noapic [SMP,APIC] Tells the kernel to not make use of any |
| 1195 | IOAPICs that may be present in the system. |
| 1196 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1197 | nobats [PPC] Do not use BATs for mapping kernel lowmem |
| 1198 | on "Classic" PPC cores. |
| 1199 | |
| 1200 | nocache [ARM] |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 1201 | |
Shailabh Nagar | 163ecdf | 2006-07-30 03:03:11 -0700 | [diff] [blame] | 1202 | nodelayacct [KNL] Disable per-task delay accounting |
| 1203 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1204 | nodisconnect [HW,SCSI,M68K] Disables SCSI disconnects. |
| 1205 | |
Huang, Ying | 8b2cb7a | 2008-01-30 13:32:11 +0100 | [diff] [blame] | 1206 | noefi [X86-32,X86-64] Disable EFI runtime services support. |
| 1207 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1208 | noexec [IA-64] |
| 1209 | |
Alan Cox | cd4f0ef | 2007-07-31 00:37:59 -0700 | [diff] [blame] | 1210 | noexec [X86-32,X86-64] |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1211 | noexec=on: enable non-executable mappings (default) |
| 1212 | noexec=off: disable nn-executable mappings |
| 1213 | |
Alan Cox | cd4f0ef | 2007-07-31 00:37:59 -0700 | [diff] [blame] | 1214 | nofxsr [BUGS=X86-32] Disables x86 floating point extended |
Chuck Ebbert | 4f88651 | 2006-03-23 02:59:34 -0800 | [diff] [blame] | 1215 | register save and restore. The kernel will only save |
| 1216 | legacy floating-point registers on task switch. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1217 | |
Andi Kleen | 191679f | 2008-01-30 13:33:21 +0100 | [diff] [blame] | 1218 | noclflush [BUGS=X86] Don't use the CLFLUSH instruction |
| 1219 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1220 | nohlt [BUGS=ARM] |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 1221 | |
Alan Cox | cd4f0ef | 2007-07-31 00:37:59 -0700 | [diff] [blame] | 1222 | no-hlt [BUGS=X86-32] Tells the kernel that the hlt |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1223 | instruction doesn't work correctly and not to |
| 1224 | use it. |
| 1225 | |
| 1226 | nohalt [IA-64] Tells the kernel not to use the power saving |
| 1227 | function PAL_HALT_LIGHT when idle. This increases |
| 1228 | power-consumption. On the positive side, it reduces |
| 1229 | interrupt wake-up latency, which may improve performance |
| 1230 | in certain environments such as networked servers or |
| 1231 | real-time systems. |
| 1232 | |
Thomas Gleixner | 79bf2bb | 2007-02-16 01:28:03 -0800 | [diff] [blame] | 1233 | nohz= [KNL] Boottime enable/disable dynamic ticks |
| 1234 | Valid arguments: on, off |
| 1235 | Default: on |
| 1236 | |
Alan Cox | cd4f0ef | 2007-07-31 00:37:59 -0700 | [diff] [blame] | 1237 | noirqbalance [X86-32,SMP,KNL] Disable kernel irq balancing |
Zachary Amsden | 8542b20 | 2006-12-07 02:14:09 +0100 | [diff] [blame] | 1238 | |
Alan Cox | cd4f0ef | 2007-07-31 00:37:59 -0700 | [diff] [blame] | 1239 | noirqdebug [X86-32] Disables the code which attempts to detect and |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1240 | disable unhandled interrupt sources. |
| 1241 | |
Alan Cox | cd4f0ef | 2007-07-31 00:37:59 -0700 | [diff] [blame] | 1242 | 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] | 1243 | broken timer IRQ sources. |
| 1244 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1245 | noisapnp [ISAPNP] Disables ISA PnP code. |
| 1246 | |
| 1247 | noinitrd [RAM] Tells the kernel not to load any configured |
| 1248 | initial RAM disk. |
| 1249 | |
| 1250 | nointroute [IA-64] |
| 1251 | |
Tony Luck | 0aa366f | 2007-07-20 11:22:30 -0700 | [diff] [blame] | 1252 | nojitter [IA64] Disables jitter checking for ITC timers. |
| 1253 | |
Alan Cox | cd4f0ef | 2007-07-31 00:37:59 -0700 | [diff] [blame] | 1254 | nolapic [X86-32,APIC] Do not enable or use the local APIC. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1255 | |
Alan Cox | cd4f0ef | 2007-07-31 00:37:59 -0700 | [diff] [blame] | 1256 | nolapic_timer [X86-32,APIC] Do not use the local APIC timer. |
Thomas Gleixner | ad62ca2 | 2007-03-22 00:11:21 -0800 | [diff] [blame] | 1257 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1258 | noltlbs [PPC] Do not use large page/tlb entries for kernel |
| 1259 | lowmem mapping on PPC40x. |
| 1260 | |
Horms | 312f1f0 | 2006-02-22 09:57:55 +0900 | [diff] [blame] | 1261 | nomca [IA-64] Disable machine check abort handling |
| 1262 | |
Alan Cox | cd4f0ef | 2007-07-31 00:37:59 -0700 | [diff] [blame] | 1263 | nomce [X86-32] Machine Check Exception |
Horms | abe37e5 | 2006-04-01 01:36:09 +0200 | [diff] [blame] | 1264 | |
Andres Salomon | 83d7384 | 2007-10-12 23:04:06 +0200 | [diff] [blame] | 1265 | nomfgpt [X86-32] Disable Multi-Function General Purpose |
| 1266 | Timer usage (for AMD Geode machines). |
| 1267 | |
Alan Cox | cd4f0ef | 2007-07-31 00:37:59 -0700 | [diff] [blame] | 1268 | noreplace-paravirt [X86-32,PV_OPS] Don't patch paravirt_ops |
Jeremy Fitzhardinge | 959b4fd | 2007-05-02 19:27:16 +0200 | [diff] [blame] | 1269 | |
Alan Cox | cd4f0ef | 2007-07-31 00:37:59 -0700 | [diff] [blame] | 1270 | noreplace-smp [X86-32,SMP] Don't replace SMP instructions |
Jeremy Fitzhardinge | b7fb4af | 2007-05-02 19:27:13 +0200 | [diff] [blame] | 1271 | with UP alternatives |
| 1272 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1273 | noresidual [PPC] Don't use residual data on PReP machines. |
| 1274 | |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 1275 | noresume [SWSUSP] Disables resume and restores original swap |
| 1276 | space. |
| 1277 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1278 | no-scroll [VGA] Disables scrollback. |
| 1279 | This is required for the Braillex ib80-piezo Braille |
| 1280 | reader made by F.H. Papenmeier (Germany). |
| 1281 | |
| 1282 | nosbagart [IA-64] |
| 1283 | |
Alan Cox | cd4f0ef | 2007-07-31 00:37:59 -0700 | [diff] [blame] | 1284 | nosep [BUGS=X86-32] Disables x86 SYSENTER/SYSEXIT support. |
Chuck Ebbert | 4f88651 | 2006-03-23 02:59:34 -0800 | [diff] [blame] | 1285 | |
Len Brown | 61ec756 | 2007-08-16 03:34:22 -0400 | [diff] [blame] | 1286 | nosmp [SMP] Tells an SMP kernel to act as a UP kernel, |
| 1287 | and disable the IO APIC. legacy for "maxcpus=0". |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1288 | |
Dave Jones | 9784221 | 2007-07-15 23:41:05 -0700 | [diff] [blame] | 1289 | nosoftlockup [KNL] Disable the soft-lockup detector. |
| 1290 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1291 | nosync [HW,M68K] Disables sync negotiation for all devices. |
| 1292 | |
Alan Cox | cd4f0ef | 2007-07-31 00:37:59 -0700 | [diff] [blame] | 1293 | notsc [BUGS=X86-32] Disable Time Stamp Counter |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1294 | |
| 1295 | nousb [USB] Disable the USB subsystem |
| 1296 | |
| 1297 | nowb [ARM] |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 1298 | |
KAMEZAWA Hiroyuki | f0c0b2b | 2007-07-15 23:38:01 -0700 | [diff] [blame] | 1299 | numa_zonelist_order= [KNL, BOOT] Select zonelist order for NUMA. |
| 1300 | one of ['zone', 'node', 'default'] can be specified |
| 1301 | This can be set from sysctl after boot. |
| 1302 | See Documentation/sysctl/vm.txt for details. |
| 1303 | |
Dave Jones | a61c2d7 | 2006-01-07 23:18:19 +0000 | [diff] [blame] | 1304 | nr_uarts= [SERIAL] maximum number of UARTs to be registered. |
| 1305 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1306 | opl3= [HW,OSS] |
| 1307 | Format: <io> |
| 1308 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1309 | oprofile.timer= [HW] |
| 1310 | Use timer interrupt instead of performance counters |
| 1311 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1312 | osst= [HW,SCSI] SCSI Tape Driver |
| 1313 | Format: <buffer_size>,<write_threshold> |
| 1314 | See also Documentation/scsi/st.txt. |
| 1315 | |
| 1316 | panic= [KNL] Kernel behaviour on panic |
| 1317 | Format: <timeout> |
| 1318 | |
| 1319 | parkbd.port= [HW] Parallel port number the keyboard adapter is |
| 1320 | connected to, default is 0. |
| 1321 | Format: <parport#> |
| 1322 | parkbd.mode= [HW] Parallel port keyboard adapter mode of operation, |
| 1323 | 0 for XT, 1 for AT (default is AT). |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 1324 | Format: <mode> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1325 | |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 1326 | parport= [HW,PPT] Specify parallel ports. 0 disables. |
| 1327 | Format: { 0 | auto | 0xBBB[,IRQ[,DMA]] } |
| 1328 | Use 'auto' to force the driver to use any |
| 1329 | IRQ/DMA settings detected (the default is to |
| 1330 | ignore detected IRQ/DMA settings because of |
| 1331 | possible conflicts). You can specify the base |
| 1332 | address, IRQ, and DMA settings; IRQ and DMA |
| 1333 | should be numbers, or 'auto' (for using detected |
| 1334 | settings on that particular port), or 'nofifo' |
| 1335 | (to avoid using a FIFO even if it is detected). |
| 1336 | Parallel ports are assigned in the order they |
| 1337 | are specified on the command line, starting |
| 1338 | with parport0. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1339 | |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 1340 | parport_init_mode= [HW,PPT] |
| 1341 | Configure VIA parallel port to operate in |
| 1342 | a specific mode. This is necessary on Pegasos |
| 1343 | computer where firmware has no options for setting |
| 1344 | up parallel port mode and sets it to spp. |
| 1345 | Currently this function knows 686a and 8231 chips. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1346 | Format: [spp|ps2|epp|ecp|ecpepp] |
| 1347 | |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 1348 | pas2= [HW,OSS] Format: |
| 1349 | <io>,<irq>,<dma>,<dma16>,<sb_io>,<sb_irq>,<sb_dma>,<sb_dma16> |
| 1350 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1351 | pas16= [HW,SCSI] |
| 1352 | See header of drivers/scsi/pas16.c. |
| 1353 | |
Andrew Morton | dd28779 | 2006-03-23 03:00:57 -0800 | [diff] [blame] | 1354 | pause_on_oops= |
| 1355 | Halt all CPUs after the first oops has been printed for |
| 1356 | the specified number of seconds. This is to be used if |
| 1357 | your oopses keep scrolling off the screen. |
| 1358 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1359 | pcbit= [HW,ISDN] |
| 1360 | |
| 1361 | pcd. [PARIDE] |
| 1362 | See header of drivers/block/paride/pcd.c. |
| 1363 | See also Documentation/paride.txt. |
| 1364 | |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 1365 | pci=option[,option...] [PCI] various PCI subsystem options: |
Alan Cox | cd4f0ef | 2007-07-31 00:37:59 -0700 | [diff] [blame] | 1366 | off [X86-32] don't probe for the PCI bus |
| 1367 | bios [X86-32] force use of PCI BIOS, don't access |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 1368 | the hardware directly. Use this if your machine |
| 1369 | has a non-standard PCI host bridge. |
Alan Cox | cd4f0ef | 2007-07-31 00:37:59 -0700 | [diff] [blame] | 1370 | nobios [X86-32] disallow use of PCI BIOS, only direct |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 1371 | hardware access methods are allowed. Use this |
| 1372 | if you experience crashes upon bootup and you |
| 1373 | suspect they are caused by the BIOS. |
Alan Cox | cd4f0ef | 2007-07-31 00:37:59 -0700 | [diff] [blame] | 1374 | conf1 [X86-32] Force use of PCI Configuration |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 1375 | Mechanism 1. |
Alan Cox | cd4f0ef | 2007-07-31 00:37:59 -0700 | [diff] [blame] | 1376 | conf2 [X86-32] Force use of PCI Configuration |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 1377 | Mechanism 2. |
Randy Dunlap | 7f78576 | 2007-10-05 13:17:58 -0700 | [diff] [blame] | 1378 | noaer [PCIE] If the PCIEAER kernel config parameter is |
| 1379 | enabled, this kernel boot option can be used to |
| 1380 | disable the use of PCIE advanced error reporting. |
Jeff Garzik | 32a2eea | 2007-10-11 16:57:27 -0400 | [diff] [blame] | 1381 | nodomains [PCI] Disable support for multiple PCI |
| 1382 | root domains (aka PCI segments, in ACPI-speak). |
Alan Cox | cd4f0ef | 2007-07-31 00:37:59 -0700 | [diff] [blame] | 1383 | nommconf [X86-32,X86_64] Disable use of MMCONFIG for PCI |
Bjorn Helgaas | 61be6d6 | 2006-02-15 15:17:43 -0800 | [diff] [blame] | 1384 | Configuration |
Matthew Wilcox | 309e57d | 2006-03-05 22:33:34 -0700 | [diff] [blame] | 1385 | nomsi [MSI] If the PCI_MSI kernel config parameter is |
| 1386 | enabled, this kernel boot option can be used to |
| 1387 | disable the use of MSI interrupts system-wide. |
Alan Cox | cd4f0ef | 2007-07-31 00:37:59 -0700 | [diff] [blame] | 1388 | nosort [X86-32] Don't sort PCI devices according to |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 1389 | order given by the PCI BIOS. This sorting is |
| 1390 | done to get a device order compatible with |
| 1391 | older kernels. |
Alan Cox | cd4f0ef | 2007-07-31 00:37:59 -0700 | [diff] [blame] | 1392 | biosirq [X86-32] Use PCI BIOS calls to get the interrupt |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 1393 | routing table. These calls are known to be buggy |
| 1394 | on several machines and they hang the machine |
| 1395 | when used, but on other computers it's the only |
| 1396 | way to get the interrupt routing table. Try |
| 1397 | this option if the kernel is unable to allocate |
| 1398 | IRQs or discover secondary PCI buses on your |
| 1399 | motherboard. |
Alan Cox | cd4f0ef | 2007-07-31 00:37:59 -0700 | [diff] [blame] | 1400 | rom [X86-32] Assign address space to expansion ROMs. |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 1401 | Use with caution as certain devices share |
| 1402 | address decoders between ROMs and other |
| 1403 | resources. |
Alan Cox | cd4f0ef | 2007-07-31 00:37:59 -0700 | [diff] [blame] | 1404 | irqmask=0xMMMM [X86-32] Set a bit mask of IRQs allowed to be |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 1405 | assigned automatically to PCI devices. You can |
| 1406 | make the kernel exclude IRQs of your ISA cards |
| 1407 | this way. |
Alan Cox | cd4f0ef | 2007-07-31 00:37:59 -0700 | [diff] [blame] | 1408 | pirqaddr=0xAAAAA [X86-32] Specify the physical address |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 1409 | of the PIRQ table (normally generated |
| 1410 | by the BIOS) if it is outside the |
| 1411 | F0000h-100000h range. |
Alan Cox | cd4f0ef | 2007-07-31 00:37:59 -0700 | [diff] [blame] | 1412 | lastbus=N [X86-32] Scan all buses thru bus #N. Can be |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 1413 | useful if the kernel is unable to find your |
| 1414 | secondary buses and you want to tell it |
| 1415 | explicitly which ones they are. |
Alan Cox | cd4f0ef | 2007-07-31 00:37:59 -0700 | [diff] [blame] | 1416 | assign-busses [X86-32] Always assign all PCI bus |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 1417 | numbers ourselves, overriding |
| 1418 | whatever the firmware may have done. |
Alan Cox | cd4f0ef | 2007-07-31 00:37:59 -0700 | [diff] [blame] | 1419 | usepirqmask [X86-32] Honor the possible IRQ mask stored |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 1420 | in the BIOS $PIR table. This is needed on |
| 1421 | some systems with broken BIOSes, notably |
| 1422 | some HP Pavilion N5400 and Omnibook XE3 |
| 1423 | notebooks. This will have no effect if ACPI |
| 1424 | IRQ routing is enabled. |
Alan Cox | cd4f0ef | 2007-07-31 00:37:59 -0700 | [diff] [blame] | 1425 | noacpi [X86-32] Do not use ACPI for IRQ routing |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 1426 | or for PCI scanning. |
Gary Hade | 62f420f | 2007-10-03 15:56:51 -0700 | [diff] [blame] | 1427 | use_crs [X86-32] Use _CRS for PCI resource |
| 1428 | allocation. |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 1429 | routeirq Do IRQ routing for all PCI devices. |
| 1430 | This is normally done in pci_enable_device(), |
| 1431 | so this option is a temporary workaround |
| 1432 | for broken drivers that don't call it. |
| 1433 | firmware [ARM] Do not re-enumerate the bus but instead |
| 1434 | just use the configuration from the |
| 1435 | bootloader. This is currently used on |
| 1436 | IXP2000 systems where the bus has to be |
| 1437 | configured a certain way for adjunct CPUs. |
Andi Kleen | 0637a70 | 2006-09-26 10:52:41 +0200 | [diff] [blame] | 1438 | noearly [X86] Don't do any early type 1 scanning. |
| 1439 | This might help on some broken boards which |
| 1440 | machine check when some devices' config space |
| 1441 | is read. But various workarounds are disabled |
| 1442 | and some IOMMU drivers will not work. |
Matt Domsch | 6b4b78f | 2006-09-29 15:23:23 -0500 | [diff] [blame] | 1443 | bfsort Sort PCI devices into breadth-first order. |
| 1444 | This sorting is done to get a device |
| 1445 | order compatible with older (<= 2.4) kernels. |
| 1446 | nobfsort Don't sort PCI devices into breadth-first order. |
Atsushi Nemoto | 4516a61 | 2007-02-05 16:36:06 -0800 | [diff] [blame] | 1447 | cbiosize=nn[KMG] The fixed amount of bus space which is |
| 1448 | reserved for the CardBus bridge's IO window. |
| 1449 | The default value is 256 bytes. |
| 1450 | cbmemsize=nn[KMG] The fixed amount of bus space which is |
| 1451 | reserved for the CardBus bridge's memory |
| 1452 | window. The default value is 64 megabytes. |
Matt Domsch | 6b4b78f | 2006-09-29 15:23:23 -0500 | [diff] [blame] | 1453 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1454 | pcmv= [HW,PCMCIA] BadgePAD 4 |
| 1455 | |
| 1456 | pd. [PARIDE] |
| 1457 | See Documentation/paride.txt. |
| 1458 | |
| 1459 | pdcchassis= [PARISC,HW] Disable/Enable PDC Chassis Status codes at |
| 1460 | boot time. |
| 1461 | Format: { 0 | 1 } |
| 1462 | See arch/parisc/kernel/pdc_chassis.c |
| 1463 | |
| 1464 | pf. [PARIDE] |
| 1465 | See Documentation/paride.txt. |
| 1466 | |
| 1467 | pg. [PARIDE] |
| 1468 | See Documentation/paride.txt. |
| 1469 | |
| 1470 | pirq= [SMP,APIC] Manual mp-table setup |
| 1471 | See Documentation/i386/IO-APIC.txt. |
| 1472 | |
| 1473 | plip= [PPT,NET] Parallel port network link |
| 1474 | Format: { parport<nr> | timid | 0 } |
| 1475 | See also Documentation/parport.txt. |
| 1476 | |
| 1477 | pnpacpi= [ACPI] |
| 1478 | { off } |
| 1479 | |
| 1480 | pnpbios= [ISAPNP] |
| 1481 | { on | off | curr | res | no-curr | no-res } |
| 1482 | |
| 1483 | pnp_reserve_irq= |
| 1484 | [ISAPNP] Exclude IRQs for the autoconfiguration |
| 1485 | |
| 1486 | pnp_reserve_dma= |
| 1487 | [ISAPNP] Exclude DMAs for the autoconfiguration |
| 1488 | |
| 1489 | pnp_reserve_io= [ISAPNP] Exclude I/O ports for the autoconfiguration |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 1490 | Ranges are in pairs (I/O port base and size). |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1491 | |
| 1492 | pnp_reserve_mem= |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 1493 | [ISAPNP] Exclude memory regions for the |
| 1494 | autoconfiguration. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1495 | Ranges are in pairs (memory base and size). |
| 1496 | |
Ingo Molnar | 45807a1 | 2007-07-15 23:40:10 -0700 | [diff] [blame] | 1497 | print-fatal-signals= |
| 1498 | [KNL] debug: print fatal signals |
| 1499 | print-fatal-signals=1: print segfault info to |
| 1500 | the kernel console. |
| 1501 | default: off. |
| 1502 | |
Randy Dunlap | e84845c | 2007-07-15 23:40:25 -0700 | [diff] [blame] | 1503 | printk.time= Show timing data prefixed to each printk message line |
| 1504 | Format: <bool> (1/Y/y=enable, 0/N/n=disable) |
| 1505 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1506 | profile= [KNL] Enable kernel profiling via /proc/profile |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 1507 | Format: [schedule,]<number> |
| 1508 | Param: "schedule" - profile schedule points. |
| 1509 | Param: <number> - step/bucket size as a power of 2 for |
| 1510 | statistical time based profiling. |
Mel Gorman | b3da2a7 | 2007-10-24 18:23:50 +0200 | [diff] [blame] | 1511 | Param: "sleep" - profile D-state sleeping (millisecs). |
| 1512 | Requires CONFIG_SCHEDSTATS |
Dave Jones | c0fe2e6 | 2007-10-20 03:08:22 +0200 | [diff] [blame] | 1513 | Param: "kvm" - profile VM exits. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1514 | |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 1515 | processor.max_cstate= [HW,ACPI] |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1516 | Limit processor to maximum C-state |
| 1517 | max_cstate=9 overrides any DMI blacklist limit. |
| 1518 | |
Len Brown | 41c0d86 | 2005-12-28 12:43:51 -0500 | [diff] [blame] | 1519 | processor.nocst [HW,ACPI] |
| 1520 | Ignore the _CST method to determine C-states, |
| 1521 | instead using the legacy FADT method |
| 1522 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1523 | prompt_ramdisk= [RAM] List of RAM disks to prompt for floppy disk |
| 1524 | before loading. |
| 1525 | See Documentation/ramdisk.txt. |
| 1526 | |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 1527 | psmouse.proto= [HW,MOUSE] Highest PS2 mouse protocol extension to |
| 1528 | probe for; one of (bare|imps|exps|lifebook|any). |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1529 | psmouse.rate= [HW,MOUSE] Set desired mouse report rate, in reports |
| 1530 | per second. |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 1531 | psmouse.resetafter= [HW,MOUSE] |
| 1532 | Try to reset the device after so many bad packets |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1533 | (0 = never). |
| 1534 | psmouse.resolution= |
| 1535 | [HW,MOUSE] Set desired mouse resolution, in dpi. |
| 1536 | psmouse.smartscroll= |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 1537 | [HW,MOUSE] Controls Logitech smartscroll autorepeat. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1538 | 0 = disabled, 1 = enabled (default). |
| 1539 | |
| 1540 | pss= [HW,OSS] Personal Sound System (ECHO ESC614) |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 1541 | Format: |
| 1542 | <io>,<mss_io>,<mss_irq>,<mss_dma>,<mpu_io>,<mpu_irq> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1543 | |
| 1544 | pt. [PARIDE] |
| 1545 | See Documentation/paride.txt. |
| 1546 | |
Kay Sievers | dc8c858 | 2007-08-15 12:25:38 +0200 | [diff] [blame] | 1547 | pty.legacy_count= |
| 1548 | [KNL] Number of legacy pty's. Overwrites compiled-in |
| 1549 | default number. |
| 1550 | |
Randy Dunlap | 7d2c502 | 2006-09-29 02:01:02 -0700 | [diff] [blame] | 1551 | quiet [KNL] Disable most log messages |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 1552 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1553 | r128= [HW,DRM] |
| 1554 | |
| 1555 | raid= [HW,RAID] |
| 1556 | See Documentation/md.txt. |
| 1557 | |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 1558 | ramdisk_blocksize= [RAM] |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1559 | See Documentation/ramdisk.txt. |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 1560 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1561 | ramdisk_size= [RAM] Sizes of RAM disks in kilobytes |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1562 | See Documentation/ramdisk.txt. |
| 1563 | |
Dipankar Sarma | 21a1ea9 | 2006-03-07 21:55:33 -0800 | [diff] [blame] | 1564 | rcu.blimit= [KNL,BOOT] Set maximum number of finished |
| 1565 | RCU callbacks to process in one batch. |
| 1566 | |
| 1567 | rcu.qhimark= [KNL,BOOT] Set threshold of queued |
| 1568 | RCU callbacks over which batch limiting is disabled. |
| 1569 | |
| 1570 | rcu.qlowmark= [KNL,BOOT] Set threshold of queued |
| 1571 | RCU callbacks below which batch limiting is re-enabled. |
| 1572 | |
Olof Johansson | ffdfc40 | 2005-09-06 15:17:19 -0700 | [diff] [blame] | 1573 | rdinit= [KNL] |
| 1574 | Format: <full_path> |
| 1575 | Run specified binary instead of /init from the ramdisk, |
| 1576 | used for early userspace startup. See initrd. |
| 1577 | |
Alan Cox | cd4f0ef | 2007-07-31 00:37:59 -0700 | [diff] [blame] | 1578 | reboot= [BUGS=X86-32,BUGS=ARM,BUGS=IA-64] Rebooting mode |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1579 | Format: <reboot_mode>[,<reboot_mode2>[,...]] |
Mauro Carvalho Chehab | e53dd08 | 2007-09-15 07:38:47 -0300 | [diff] [blame] | 1580 | See arch/*/kernel/reboot.c or arch/*/kernel/process.c |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1581 | |
| 1582 | reserve= [KNL,BUGS] Force the kernel to ignore some iomem area |
| 1583 | |
Alan Cox | cd4f0ef | 2007-07-31 00:37:59 -0700 | [diff] [blame] | 1584 | reservetop= [X86-32] |
Zachary Amsden | 461a9af | 2006-09-25 23:32:25 -0700 | [diff] [blame] | 1585 | Format: nn[KMG] |
| 1586 | Reserves a hole at the top of the kernel virtual |
| 1587 | address space. |
| 1588 | |
Vivek Goyal | 7e96287 | 2006-09-27 01:50:44 -0700 | [diff] [blame] | 1589 | reset_devices [KNL] Force drivers to reset the underlying device |
| 1590 | during initialization. |
| 1591 | |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 1592 | resume= [SWSUSP] |
| 1593 | Specify the partition device for software suspend |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1594 | |
Rafael J. Wysocki | ecbd0da | 2006-12-06 20:34:13 -0800 | [diff] [blame] | 1595 | resume_offset= [SWSUSP] |
| 1596 | Specify the offset from the beginning of the partition |
| 1597 | given by "resume=" at which the swap header is located, |
| 1598 | in <PAGE_SIZE> units (needed only for swap files). |
| 1599 | See Documentation/power/swsusp-and-swap-files.txt |
| 1600 | |
Michael Neuling | 0a7b35c | 2007-02-10 01:44:33 -0800 | [diff] [blame] | 1601 | retain_initrd [RAM] Keep initrd memory after extraction |
| 1602 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1603 | rhash_entries= [KNL,NET] |
| 1604 | Set number of hash buckets for route cache |
| 1605 | |
| 1606 | riscom8= [HW,SERIAL] |
| 1607 | Format: <io_board1>[,<io_board2>[,...<io_boardN>]] |
| 1608 | |
| 1609 | ro [KNL] Mount root device read-only on boot |
| 1610 | |
| 1611 | root= [KNL] Root filesystem |
| 1612 | |
| 1613 | rootdelay= [KNL] Delay (in seconds) to pause before attempting to |
| 1614 | mount the root filesystem |
| 1615 | |
| 1616 | rootflags= [KNL] Set root filesystem mount option string |
| 1617 | |
| 1618 | rootfstype= [KNL] Set root filesystem type |
| 1619 | |
Pierre Ossman | cc1ed75 | 2007-07-15 23:40:35 -0700 | [diff] [blame] | 1620 | rootwait [KNL] Wait (indefinitely) for root device to show up. |
| 1621 | Useful for devices that are detected asynchronously |
| 1622 | (e.g. USB and MMC devices). |
| 1623 | |
James Morris | 20510f2 | 2007-10-16 23:31:32 -0700 | [diff] [blame] | 1624 | root_plug.vendor_id= |
| 1625 | [ROOTPLUG] Override the default vendor ID |
| 1626 | |
| 1627 | root_plug.product_id= |
| 1628 | [ROOTPLUG] Override the default product ID |
| 1629 | |
| 1630 | root_plug.debug= |
| 1631 | [ROOTPLUG] Enable debugging output |
| 1632 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1633 | rw [KNL] Mount root device read-write on boot |
| 1634 | |
| 1635 | S [KNL] Run init in single mode |
| 1636 | |
| 1637 | sa1100ir [NET] |
| 1638 | See drivers/net/irda/sa1100_ir.c. |
| 1639 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1640 | sbni= [NET] Granch SBNI12 leased line adapter |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 1641 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1642 | sc1200wdt= [HW,WDT] SC1200 WDT (watchdog) driver |
| 1643 | Format: <io>[,<timeout>[,<isapnp>]] |
| 1644 | |
| 1645 | scsi_debug_*= [SCSI] |
| 1646 | See drivers/scsi/scsi_debug.c. |
| 1647 | |
| 1648 | scsi_default_dev_flags= |
| 1649 | [SCSI] SCSI default device flags |
| 1650 | Format: <integer> |
| 1651 | |
| 1652 | scsi_dev_flags= [SCSI] Black/white list entry for vendor and model |
| 1653 | Format: <vendor>:<model>:<flags> |
| 1654 | (flags are integer value) |
| 1655 | |
Randy Dunlap | 6af6632 | 2007-11-14 16:52:25 -0800 | [diff] [blame] | 1656 | scsi_logging_level= [SCSI] a bit mask of logging levels |
| 1657 | See drivers/scsi/scsi_logging.h for bits. Also |
| 1658 | settable via sysctl at dev.scsi.logging_level |
| 1659 | (/proc/sys/dev/scsi/logging_level). |
| 1660 | There is also a nice 'scsi_logging_level' script in the |
| 1661 | S390-tools package, available for download at |
| 1662 | 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] | 1663 | |
Matthew Wilcox | 3e082a9 | 2006-09-28 15:19:20 -0600 | [diff] [blame] | 1664 | scsi_mod.scan= [SCSI] sync (default) scans SCSI busses as they are |
| 1665 | discovered. async scans them in kernel threads, |
| 1666 | allowing boot to proceed. none ignores them, expecting |
| 1667 | user space to do the scan. |
| 1668 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1669 | selinux [SELINUX] Disable or enable SELinux at boot time. |
| 1670 | Format: { "0" | "1" } |
| 1671 | See security/selinux/Kconfig help text. |
| 1672 | 0 -- disable. |
| 1673 | 1 -- enable. |
| 1674 | Default value is set via kernel config option. |
| 1675 | If enabled at boot time, /selinux/disable can be used |
| 1676 | later to disable prior to initial policy load. |
| 1677 | |
James Morris | 4e5ab4c | 2006-06-09 00:33:33 -0700 | [diff] [blame] | 1678 | selinux_compat_net = |
| 1679 | [SELINUX] Set initial selinux_compat_net flag value. |
Mauro Carvalho Chehab | e53dd08 | 2007-09-15 07:38:47 -0300 | [diff] [blame] | 1680 | Format: { "0" | "1" } |
| 1681 | 0 -- use new secmark-based packet controls |
| 1682 | 1 -- use legacy packet controls |
| 1683 | Default value is 0 (preferred). |
| 1684 | Value can be changed at runtime via |
| 1685 | /selinux/compat_net. |
James Morris | 4e5ab4c | 2006-06-09 00:33:33 -0700 | [diff] [blame] | 1686 | |
Alan Cox | cd4f0ef | 2007-07-31 00:37:59 -0700 | [diff] [blame] | 1687 | serialnumber [BUGS=X86-32] |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1688 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1689 | shapers= [NET] |
| 1690 | Maximal number of shapers. |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 1691 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1692 | sim710= [SCSI,HW] |
| 1693 | See header of drivers/scsi/sim710.c. |
| 1694 | |
| 1695 | simeth= [IA-64] |
| 1696 | simscsi= |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 1697 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1698 | slram= [HW,MTD] |
| 1699 | |
Christoph Lameter | f0630ff | 2007-07-15 23:38:14 -0700 | [diff] [blame] | 1700 | slub_debug[=options[,slabs]] [MM, SLUB] |
| 1701 | Enabling slub_debug allows one to determine the |
| 1702 | culprit if slab objects become corrupted. Enabling |
| 1703 | slub_debug can create guard zones around objects and |
| 1704 | may poison objects when not in use. Also tracks the |
| 1705 | last alloc / free. For more information see |
| 1706 | Documentation/vm/slub.txt. |
Christoph Lameter | c1aee21 | 2007-05-31 00:40:47 -0700 | [diff] [blame] | 1707 | |
| 1708 | slub_max_order= [MM, SLUB] |
Christoph Lameter | f0630ff | 2007-07-15 23:38:14 -0700 | [diff] [blame] | 1709 | Determines the maximum allowed order for slabs. |
| 1710 | A high setting may cause OOMs due to memory |
| 1711 | fragmentation. For more information see |
| 1712 | Documentation/vm/slub.txt. |
Christoph Lameter | c1aee21 | 2007-05-31 00:40:47 -0700 | [diff] [blame] | 1713 | |
| 1714 | slub_min_objects= [MM, SLUB] |
Christoph Lameter | f0630ff | 2007-07-15 23:38:14 -0700 | [diff] [blame] | 1715 | The minimum number of objects per slab. SLUB will |
| 1716 | increase the slab order up to slub_max_order to |
| 1717 | generate a sufficiently large slab able to contain |
| 1718 | the number of objects indicated. The higher the number |
| 1719 | of objects the smaller the overhead of tracking slabs |
| 1720 | and the less frequently locks need to be acquired. |
Christoph Lameter | c1aee21 | 2007-05-31 00:40:47 -0700 | [diff] [blame] | 1721 | For more information see Documentation/vm/slub.txt. |
| 1722 | |
| 1723 | slub_min_order= [MM, SLUB] |
| 1724 | Determines the mininum page order for slabs. Must be |
Christoph Lameter | f0630ff | 2007-07-15 23:38:14 -0700 | [diff] [blame] | 1725 | lower than slub_max_order. |
Christoph Lameter | c1aee21 | 2007-05-31 00:40:47 -0700 | [diff] [blame] | 1726 | For more information see Documentation/vm/slub.txt. |
| 1727 | |
| 1728 | slub_nomerge [MM, SLUB] |
Christoph Lameter | f0630ff | 2007-07-15 23:38:14 -0700 | [diff] [blame] | 1729 | Disable merging of slabs with similar size. May be |
Christoph Lameter | c1aee21 | 2007-05-31 00:40:47 -0700 | [diff] [blame] | 1730 | necessary if there is some reason to distinguish |
Christoph Lameter | f0630ff | 2007-07-15 23:38:14 -0700 | [diff] [blame] | 1731 | allocs to different slabs. Debug options disable |
| 1732 | merging on their own. |
Christoph Lameter | c1aee21 | 2007-05-31 00:40:47 -0700 | [diff] [blame] | 1733 | For more information see Documentation/vm/slub.txt. |
| 1734 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1735 | smart2= [HW] |
| 1736 | Format: <io1>[,<io2>[,...,<io8>]] |
| 1737 | |
Alan Cox | cd4f0ef | 2007-07-31 00:37:59 -0700 | [diff] [blame] | 1738 | smp-alt-once [X86-32,SMP] On a hotplug CPU system, only |
Jeremy Fitzhardinge | b7fb4af | 2007-05-02 19:27:13 +0200 | [diff] [blame] | 1739 | attempt to substitute SMP alternatives once at boot. |
| 1740 | |
Bjorn Helgaas | d0d4f69 | 2007-05-08 00:36:05 -0700 | [diff] [blame] | 1741 | smsc-ircc2.nopnp [HW] Don't use PNP to discover SMC devices |
| 1742 | smsc-ircc2.ircc_cfg= [HW] Device configuration I/O port |
| 1743 | smsc-ircc2.ircc_sir= [HW] SIR base I/O port |
| 1744 | smsc-ircc2.ircc_fir= [HW] FIR base I/O port |
| 1745 | smsc-ircc2.ircc_irq= [HW] IRQ line |
| 1746 | smsc-ircc2.ircc_dma= [HW] DMA channel |
| 1747 | smsc-ircc2.ircc_transceiver= [HW] Transceiver type: |
| 1748 | 0: Toshiba Satellite 1800 (GP data pin select) |
| 1749 | 1: Fast pin select (default) |
| 1750 | 2: ATC IRMode |
| 1751 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1752 | snd-ad1816a= [HW,ALSA] |
| 1753 | |
| 1754 | snd-ad1848= [HW,ALSA] |
| 1755 | |
| 1756 | snd-ali5451= [HW,ALSA] |
| 1757 | |
| 1758 | snd-als100= [HW,ALSA] |
| 1759 | |
| 1760 | snd-als4000= [HW,ALSA] |
| 1761 | |
| 1762 | snd-azt2320= [HW,ALSA] |
| 1763 | |
| 1764 | snd-cmi8330= [HW,ALSA] |
| 1765 | |
| 1766 | snd-cmipci= [HW,ALSA] |
| 1767 | |
| 1768 | snd-cs4231= [HW,ALSA] |
| 1769 | |
| 1770 | snd-cs4232= [HW,ALSA] |
| 1771 | |
| 1772 | snd-cs4236= [HW,ALSA] |
| 1773 | |
| 1774 | snd-cs4281= [HW,ALSA] |
| 1775 | |
| 1776 | snd-cs46xx= [HW,ALSA] |
| 1777 | |
| 1778 | snd-dt019x= [HW,ALSA] |
| 1779 | |
| 1780 | snd-dummy= [HW,ALSA] |
| 1781 | |
| 1782 | snd-emu10k1= [HW,ALSA] |
| 1783 | |
| 1784 | snd-ens1370= [HW,ALSA] |
| 1785 | |
| 1786 | snd-ens1371= [HW,ALSA] |
| 1787 | |
| 1788 | snd-es968= [HW,ALSA] |
| 1789 | |
| 1790 | snd-es1688= [HW,ALSA] |
| 1791 | |
| 1792 | snd-es18xx= [HW,ALSA] |
| 1793 | |
| 1794 | snd-es1938= [HW,ALSA] |
| 1795 | |
| 1796 | snd-es1968= [HW,ALSA] |
| 1797 | |
| 1798 | snd-fm801= [HW,ALSA] |
| 1799 | |
| 1800 | snd-gusclassic= [HW,ALSA] |
| 1801 | |
| 1802 | snd-gusextreme= [HW,ALSA] |
| 1803 | |
| 1804 | snd-gusmax= [HW,ALSA] |
| 1805 | |
| 1806 | snd-hdsp= [HW,ALSA] |
| 1807 | |
| 1808 | snd-ice1712= [HW,ALSA] |
| 1809 | |
| 1810 | snd-intel8x0= [HW,ALSA] |
| 1811 | |
| 1812 | snd-interwave= [HW,ALSA] |
| 1813 | |
| 1814 | snd-interwave-stb= |
| 1815 | [HW,ALSA] |
| 1816 | |
| 1817 | snd-korg1212= [HW,ALSA] |
| 1818 | |
| 1819 | snd-maestro3= [HW,ALSA] |
| 1820 | |
| 1821 | snd-mpu401= [HW,ALSA] |
| 1822 | |
| 1823 | snd-mtpav= [HW,ALSA] |
| 1824 | |
| 1825 | snd-nm256= [HW,ALSA] |
| 1826 | |
| 1827 | snd-opl3sa2= [HW,ALSA] |
| 1828 | |
| 1829 | snd-opti92x-ad1848= |
| 1830 | [HW,ALSA] |
| 1831 | |
| 1832 | snd-opti92x-cs4231= |
| 1833 | [HW,ALSA] |
| 1834 | |
| 1835 | snd-opti93x= [HW,ALSA] |
| 1836 | |
| 1837 | snd-pmac= [HW,ALSA] |
| 1838 | |
| 1839 | snd-rme32= [HW,ALSA] |
| 1840 | |
| 1841 | snd-rme96= [HW,ALSA] |
| 1842 | |
| 1843 | snd-rme9652= [HW,ALSA] |
| 1844 | |
| 1845 | snd-sb8= [HW,ALSA] |
| 1846 | |
| 1847 | snd-sb16= [HW,ALSA] |
| 1848 | |
| 1849 | snd-sbawe= [HW,ALSA] |
| 1850 | |
| 1851 | snd-serial= [HW,ALSA] |
| 1852 | |
| 1853 | snd-sgalaxy= [HW,ALSA] |
| 1854 | |
| 1855 | snd-sonicvibes= [HW,ALSA] |
| 1856 | |
| 1857 | snd-sun-amd7930= |
| 1858 | [HW,ALSA] |
| 1859 | |
| 1860 | snd-sun-cs4231= [HW,ALSA] |
| 1861 | |
| 1862 | snd-trident= [HW,ALSA] |
| 1863 | |
| 1864 | snd-usb-audio= [HW,ALSA,USB] |
| 1865 | |
| 1866 | snd-via82xx= [HW,ALSA] |
| 1867 | |
| 1868 | snd-virmidi= [HW,ALSA] |
| 1869 | |
| 1870 | snd-wavefront= [HW,ALSA] |
| 1871 | |
| 1872 | snd-ymfpci= [HW,ALSA] |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 1873 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1874 | sonypi.*= [HW] Sony Programmable I/O Control Device driver |
| 1875 | See Documentation/sonypi.txt |
| 1876 | |
| 1877 | specialix= [HW,SERIAL] Specialix multi-serial port adapter |
| 1878 | See Documentation/specialix.txt. |
| 1879 | |
| 1880 | spia_io_base= [HW,MTD] |
| 1881 | spia_fio_base= |
| 1882 | spia_pedr= |
| 1883 | spia_peddr= |
| 1884 | |
| 1885 | sscape= [HW,OSS] |
| 1886 | Format: <io>,<irq>,<dma>,<mpu_io>,<mpu_irq> |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 1887 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1888 | st= [HW,SCSI] SCSI tape parameters (buffers, etc.) |
| 1889 | See Documentation/scsi/st.txt. |
| 1890 | |
| 1891 | st0x= [HW,SCSI] |
| 1892 | See header of drivers/scsi/seagate.c. |
| 1893 | |
| 1894 | sti= [PARISC,HW] |
| 1895 | Format: <num> |
| 1896 | Set the STI (builtin display/keyboard on the HP-PARISC |
| 1897 | machines) console (graphic card) which should be used |
| 1898 | as the initial boot-console. |
| 1899 | See also comment in drivers/video/console/sticore.c. |
| 1900 | |
| 1901 | sti_font= [HW] |
| 1902 | See comment in drivers/video/console/sticore.c. |
| 1903 | |
| 1904 | stifb= [HW] |
| 1905 | Format: bpp:<bpp1>[:<bpp2>[:<bpp3>...]] |
| 1906 | |
Greg Banks | 42a7fc4 | 2007-03-06 01:42:23 -0800 | [diff] [blame] | 1907 | sunrpc.pool_mode= |
| 1908 | [NFS] |
| 1909 | Control how the NFS server code allocates CPUs to |
| 1910 | service thread pools. Depending on how many NICs |
| 1911 | you have and where their interrupts are bound, this |
| 1912 | option will affect which CPUs will do NFS serving. |
| 1913 | Note: this parameter cannot be changed while the |
| 1914 | NFS server is running. |
| 1915 | |
| 1916 | auto the server chooses an appropriate mode |
| 1917 | automatically using heuristics |
| 1918 | global a single global pool contains all CPUs |
| 1919 | percpu one pool for each CPU |
| 1920 | pernode one pool for each NUMA node (equivalent |
| 1921 | to global on non-NUMA machines) |
| 1922 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1923 | swiotlb= [IA-64] Number of I/O TLB slabs |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 1924 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1925 | switches= [HW,M68k] |
| 1926 | |
| 1927 | sym53c416= [HW,SCSI] |
| 1928 | See header of drivers/scsi/sym53c416.c. |
| 1929 | |
Ingo Molnar | 5d6f647 | 2006-12-13 00:34:36 -0800 | [diff] [blame] | 1930 | sysrq_always_enabled |
| 1931 | [KNL] |
| 1932 | Ignore sysrq setting - this boot parameter will |
| 1933 | neutralize any effect of /proc/sys/kernel/sysrq. |
| 1934 | Useful for debugging. |
| 1935 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1936 | t128= [HW,SCSI] |
| 1937 | See header of drivers/scsi/t128.c. |
| 1938 | |
| 1939 | tdfx= [HW,DRM] |
| 1940 | |
| 1941 | thash_entries= [KNL,NET] |
| 1942 | Set number of hash buckets for TCP connection |
| 1943 | |
Len Brown | f8707ec | 2007-08-12 00:12:54 -0400 | [diff] [blame] | 1944 | thermal.act= [HW,ACPI] |
| 1945 | -1: disable all active trip points in all thermal zones |
| 1946 | <degrees C>: override all lowest active trip points |
| 1947 | |
Len Brown | c52a741 | 2007-08-14 15:49:32 -0400 | [diff] [blame] | 1948 | thermal.crt= [HW,ACPI] |
| 1949 | -1: disable all critical trip points in all thermal zones |
| 1950 | <degrees C>: lower all critical trip points |
| 1951 | |
Len Brown | f548714 | 2007-08-12 00:12:44 -0400 | [diff] [blame] | 1952 | thermal.nocrt= [HW,ACPI] |
| 1953 | Set to disable actions on ACPI thermal zone |
| 1954 | critical and hot trip points. |
| 1955 | |
Len Brown | 72b33ef | 2007-08-12 00:12:17 -0400 | [diff] [blame] | 1956 | thermal.off= [HW,ACPI] |
| 1957 | 1: disable ACPI thermal control |
| 1958 | |
Len Brown | a70cdc5 | 2007-08-12 00:12:35 -0400 | [diff] [blame] | 1959 | thermal.psv= [HW,ACPI] |
| 1960 | -1: disable all passive trip points |
| 1961 | <degrees C>: override all passive trip points to this value |
| 1962 | |
Len Brown | 730ff34 | 2007-08-12 00:12:26 -0400 | [diff] [blame] | 1963 | thermal.tzp= [HW,ACPI] |
| 1964 | Specify global default ACPI thermal zone polling rate |
| 1965 | <deci-seconds>: poll all this frequency |
| 1966 | 0: no polling (default) |
| 1967 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1968 | time Show timing data prefixed to each printk message line |
Randy Dunlap | e84845c | 2007-07-15 23:40:25 -0700 | [diff] [blame] | 1969 | [deprecated, see 'printk.time'] |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1970 | |
| 1971 | tipar.timeout= [HW,PPT] |
| 1972 | Set communications timeout in tenths of a second |
| 1973 | (default 15). |
| 1974 | |
| 1975 | tipar.delay= [HW,PPT] |
| 1976 | Set inter-bit delay in microseconds (default 10). |
| 1977 | |
| 1978 | tmc8xx= [HW,SCSI] |
| 1979 | See header of drivers/scsi/seagate.c. |
| 1980 | |
| 1981 | tmscsim= [HW,SCSI] |
| 1982 | See comment before function dc390_setup() in |
| 1983 | drivers/scsi/tmscsim.c. |
| 1984 | |
| 1985 | tp720= [HW,PS2] |
| 1986 | |
| 1987 | trix= [HW,OSS] MediaTrix AudioTrix Pro |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 1988 | Format: |
| 1989 | <io>,<irq>,<dma>,<dma2>,<sb_io>,<sb_irq>,<sb_dma>,<mpu_io>,<mpu_irq> |
| 1990 | |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 1991 | turbografx.map[2|3]= [HW,JOY] |
| 1992 | TurboGraFX parallel port interface |
| 1993 | Format: |
| 1994 | <port#>,<js1>,<js2>,<js3>,<js4>,<js5>,<js6>,<js7> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1995 | See also Documentation/input/joystick-parport.txt |
| 1996 | |
| 1997 | u14-34f= [HW,SCSI] UltraStor 14F/34F SCSI host adapter |
| 1998 | See header of drivers/scsi/u14-34f.c. |
| 1999 | |
| 2000 | uart401= [HW,OSS] |
| 2001 | Format: <io>,<irq> |
| 2002 | |
| 2003 | uart6850= [HW,OSS] |
| 2004 | Format: <io>,<irq> |
| 2005 | |
Alan Stern | 5f8364b | 2006-12-05 16:29:55 -0500 | [diff] [blame] | 2006 | uhci-hcd.ignore_oc= |
| 2007 | [USB] Ignore overcurrent events (default N). |
| 2008 | Some badly-designed motherboards generate lots of |
| 2009 | bogus events, for ports that aren't wired to |
| 2010 | anything. Set this parameter to avoid log spamming. |
| 2011 | Note that genuine overcurrent events won't be |
| 2012 | reported either. |
| 2013 | |
Alan Stern | b5e795f | 2007-02-20 15:00:53 -0500 | [diff] [blame] | 2014 | usbcore.autosuspend= |
| 2015 | [USB] The autosuspend time delay (in seconds) used |
| 2016 | for newly-detected USB devices (default 2). This |
| 2017 | is the time required before an idle device will be |
| 2018 | autosuspended. Devices for which the delay is set |
Alan Stern | eaafbc3 | 2007-03-13 16:39:15 -0400 | [diff] [blame] | 2019 | to a negative value won't be autosuspended at all. |
Alan Stern | b5e795f | 2007-02-20 15:00:53 -0500 | [diff] [blame] | 2020 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2021 | usbhid.mousepoll= |
| 2022 | [USBHID] The interval which mice are to be polled at. |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 2023 | |
Alan Cox | cd4f0ef | 2007-07-31 00:37:59 -0700 | [diff] [blame] | 2024 | vdso= [X86-32,SH,x86-64] |
Jeremy Fitzhardinge | 1dbf527 | 2007-05-02 19:27:12 +0200 | [diff] [blame] | 2025 | vdso=2: enable compat VDSO (default with COMPAT_VDSO) |
Ingo Molnar | e6e5494 | 2006-06-27 02:53:50 -0700 | [diff] [blame] | 2026 | vdso=1: enable VDSO (default) |
| 2027 | vdso=0: disable VDSO mapping |
| 2028 | |
Roland McGrath | af65d64 | 2008-01-30 13:30:43 +0100 | [diff] [blame] | 2029 | vdso32= [X86-32,X86-64] |
| 2030 | vdso32=2: enable compat VDSO (default with COMPAT_VDSO) |
| 2031 | vdso32=1: enable 32-bit VDSO (default) |
| 2032 | vdso32=0: disable 32-bit VDSO mapping |
| 2033 | |
Yasuaki Ishimatsu | d080d39 | 2007-07-17 21:22:55 +0900 | [diff] [blame] | 2034 | vector= [IA-64,SMP] |
| 2035 | vector=percpu: enable percpu vector domain |
| 2036 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2037 | video= [FB] Frame buffer configuration |
| 2038 | See Documentation/fb/modedb.txt. |
| 2039 | |
Alan Cox | cd4f0ef | 2007-07-31 00:37:59 -0700 | [diff] [blame] | 2040 | vga= [BOOT,X86-32] Select a particular video mode |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 2041 | See Documentation/i386/boot.txt and |
| 2042 | Documentation/svga.txt. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2043 | Use vga=ask for menu. |
| 2044 | This is actually a boot loader parameter; the value is |
| 2045 | passed to the kernel using a special protocol. |
| 2046 | |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 2047 | 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] | 2048 | size of <nn>. This can be used to increase the |
| 2049 | minimum size (128MB on x86). It can also be used to |
| 2050 | decrease the size and leave more room for directly |
| 2051 | mapped kernel RAM. |
| 2052 | |
Peter Oberparleiter | 585c304 | 2006-06-29 15:08:25 +0200 | [diff] [blame] | 2053 | vmhalt= [KNL,S390] Perform z/VM CP command after system halt. |
| 2054 | Format: <command> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2055 | |
Peter Oberparleiter | 585c304 | 2006-06-29 15:08:25 +0200 | [diff] [blame] | 2056 | vmpanic= [KNL,S390] Perform z/VM CP command after kernel panic. |
| 2057 | Format: <command> |
| 2058 | |
| 2059 | vmpoff= [KNL,S390] Perform z/VM CP command after power off. |
| 2060 | Format: <command> |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 2061 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2062 | waveartist= [HW,OSS] |
| 2063 | Format: <io>,<irq>,<dma>,<dma2> |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 2064 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2065 | wd33c93= [HW,SCSI] |
| 2066 | See header of drivers/scsi/wd33c93.c. |
| 2067 | |
| 2068 | wd7000= [HW,SCSI] |
| 2069 | See header of drivers/scsi/wd7000.c. |
| 2070 | |
| 2071 | wdt= [WDT] Watchdog |
Gabriel C | 8dfe9c2 | 2007-08-10 13:01:00 -0700 | [diff] [blame] | 2072 | See Documentation/watchdog/wdt.txt. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2073 | |
| 2074 | xd= [HW,XT] Original XT pre-IDE (RLL encoded) disks. |
| 2075 | xd_geo= See header of drivers/block/xd.c. |
| 2076 | |
| 2077 | xirc2ps_cs= [NET,PCMCIA] |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 2078 | Format: |
| 2079 | <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] | 2080 | |
Andi Kleen | a62eaf1 | 2006-02-16 23:41:58 +0100 | [diff] [blame] | 2081 | norandmaps Don't use address space randomization |
| 2082 | Equivalent to echo 0 > /proc/sys/kernel/randomize_va_space |
| 2083 | |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 2084 | ______________________________________________________________________ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2085 | |
| 2086 | TODO: |
| 2087 | |
| 2088 | Add documentation for ALSA options. |
| 2089 | Add more DRM drivers. |