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| Kernel Parameters
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| 19:23, 20 June 2009 (UTC)19:23, 20 June 2009 (UTC)19:23, 20 June 2009 (UTC)~~
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|
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| The following is a consolidated list of the kernel parameters as implemented
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| (mostly) by the __setup() macro and sorted into English Dictionary order
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| (defined as ignoring all punctuation and sorting digits before letters in a
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| case insensitive manner), and with descriptions where known.
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|
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| Module parameters for loadable modules are specified only as the
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| parameter name with optional '=' and value as appropriate, such as:
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|
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| modprobe usbcore blinkenlights=1
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|
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| Module parameters for modules that are built into the kernel image
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| are specified on the kernel command line with the module name plus
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| '.' plus parameter name, with '=' and value if appropriate, such as:
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|
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| usbcore.blinkenlights=1
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|
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| This document may not be entirely up to date and comprehensive. The command
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| "modinfo -p ${modulename}" shows a current list of all parameters of a loadable
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| module. Loadable modules, after being loaded into the running kernel, also
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| reveal their parameters in /sys/module/${modulename}/parameters/. Some of these
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| parameters may be changed at runtime by the command
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| "echo -n ${value} > /sys/module/${modulename}/parameters/${parm}".
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|
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| The parameters listed below are only valid if certain kernel build options were
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| enabled and if respective hardware is present. The text in square brackets at
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| the beginning of each description states the restrictions within which a
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| parameter is applicable:
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|
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| ACPI ACPI support is enabled.
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| AGP AGP (Accelerated Graphics Port) is enabled.
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| ALSA ALSA sound support is enabled.
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| APIC APIC support is enabled.
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| APM Advanced Power Management support is enabled.
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| AVR32 AVR32 architecture is enabled.
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| AX25 Appropriate AX.25 support is enabled.
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| BLACKFIN Blackfin architecture is enabled.
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| DRM Direct Rendering Management support is enabled.
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| EDD BIOS Enhanced Disk Drive Services (EDD) is enabled
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| EFI EFI Partitioning (GPT) is enabled
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| EIDE EIDE/ATAPI support is enabled.
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| FB The frame buffer device is enabled.
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| HW Appropriate hardware is enabled.
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| IA-64 IA-64 architecture is enabled.
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| IOSCHED More than one I/O scheduler is enabled.
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| IP_PNP IP DHCP, BOOTP, or RARP is enabled.
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| ISAPNP ISA PnP code is enabled.
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| ISDN Appropriate ISDN support is enabled.
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| JOY Appropriate joystick support is enabled.
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| LIBATA Libata driver is enabled
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| LP Printer support is enabled.
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| LOOP Loopback device support is enabled.
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| M68k M68k architecture is enabled.
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| These options have more detailed description inside of
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| Documentation/m68k/kernel-options.txt.
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| MCA MCA bus support is enabled.
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| MDA MDA console support is enabled.
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| MOUSE Appropriate mouse support is enabled.
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| MSI Message Signaled Interrupts (PCI).
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| MTD MTD (Memory Technology Device) support is enabled.
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| NET Appropriate network support is enabled.
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| NUMA NUMA support is enabled.
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| GENERIC_TIME The generic timeofday code is enabled.
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| NFS Appropriate NFS support is enabled.
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| OSS OSS sound support is enabled.
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| PV_OPS A paravirtualized kernel is enabled.
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| PARIDE The ParIDE (parallel port IDE) subsystem is enabled.
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| PARISC The PA-RISC architecture is enabled.
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| PCI PCI bus support is enabled.
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| PCIE PCI Express support is enabled.
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| PCMCIA The PCMCIA subsystem is enabled.
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| PNP Plug & Play support is enabled.
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| PPC PowerPC architecture is enabled.
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| PPT Parallel port support is enabled.
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| PS2 Appropriate PS/2 support is enabled.
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| RAM RAM disk support is enabled.
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| ROOTPLUG The example Root Plug LSM is enabled.
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| S390 S390 architecture is enabled.
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| SCSI Appropriate SCSI support is enabled.
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| A lot of drivers has their options described inside of
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| Documentation/scsi/.
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| SECURITY Different security models are enabled.
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| SELINUX SELinux support is enabled.
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| SERIAL Serial support is enabled.
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| SH SuperH architecture is enabled.
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| SMP The kernel is an SMP kernel.
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| SPARC Sparc architecture is enabled.
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| SWSUSP Software suspend (hibernation) is enabled.
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| SUSPEND System suspend states are enabled.
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| FTRACE Function tracing enabled.
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| TS Appropriate touchscreen support is enabled.
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| UMS USB Mass Storage support is enabled.
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| USB USB support is enabled.
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| USBHID USB Human Interface Device support is enabled.
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| V4L Video For Linux support is enabled.
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| VGA The VGA console has been enabled.
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| VT Virtual terminal support is enabled.
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| WDT Watchdog support is enabled.
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| XT IBM PC/XT MFM hard disk support is enabled.
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| X86-32 X86-32, aka i386 architecture is enabled.
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| X86-64 X86-64 architecture is enabled.
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| More X86-64 boot options can be found in
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| Documentation/x86/x86_64/boot-options.txt .
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| X86 Either 32bit or 64bit x86 (same as X86-32+X86-64)
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|
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| In addition, the following text indicates that the option:
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|
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| BUGS= Relates to possible processor bugs on the said processor.
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| KNL Is a kernel start-up parameter.
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| BOOT Is a boot loader parameter.
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|
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| Parameters denoted with BOOT are actually interpreted by the boot
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| loader, and have no meaning to the kernel directly.
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| Do not modify the syntax of boot loader parameters without extreme
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| need or coordination with <Documentation/x86/boot.txt>.
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|
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| There are also arch-specific kernel-parameters not documented here.
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| See for example <Documentation/x86/x86_64/boot-options.txt>.
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|
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| Note that ALL kernel parameters listed below are CASE SENSITIVE, and that
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| a trailing = on the name of any parameter states that that parameter will
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| be entered as an environment variable, whereas its absence indicates that
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| it will appear as a kernel argument readable via /proc/cmdline by programs
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| running once the system is up.
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|
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| The number of kernel parameters is not limited, but the length of the
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| complete command line (parameters including spaces etc.) is limited to
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| a fixed number of characters. This limit depends on the architecture
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| and is between 256 and 4096 characters. It is defined in the file
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| ./include/asm/setup.h as COMMAND_LINE_SIZE.
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|
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|
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| acpi= [HW,ACPI,X86-64,i386]
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| Advanced Configuration and Power Interface
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| Format: { force | off | ht | strict | noirq | rsdt }
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| force -- enable ACPI if default was off
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| off -- disable ACPI if default was on
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| noirq -- do not use ACPI for IRQ routing
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| ht -- run only enough ACPI to enable Hyper Threading
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| strict -- Be less tolerant of platforms that are not
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| strictly ACPI specification compliant.
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| rsdt -- prefer RSDT over (default) XSDT
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|
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| See also Documentation/power/pm.txt, pci=noacpi
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|
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| acpi_apic_instance= [ACPI, IOAPIC]
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| Format: <int>
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| 2: use 2nd APIC table, if available
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| 1,0: use 1st APIC table
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| default: 0
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|
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| acpi_sleep= [HW,ACPI] Sleep options
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| Format: { s3_bios, s3_mode, s3_beep, s4_nohwsig,
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| old_ordering, s4_nonvs }
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| See Documentation/power/video.txt for information on
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| s3_bios and s3_mode.
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| s3_beep is for debugging; it makes the PC's speaker beep
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| as soon as the kernel's real-mode entry point is called.
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| s4_nohwsig prevents ACPI hardware signature from being
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| used during resume from hibernation.
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| old_ordering causes the ACPI 1.0 ordering of the _PTS
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| control method, with respect to putting devices into
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| low power states, to be enforced (the ACPI 2.0 ordering
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| of _PTS is used by default).
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| s4_nonvs prevents the kernel from saving/restoring the
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| ACPI NVS memory during hibernation.
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|
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| acpi_sci= [HW,ACPI] ACPI System Control Interrupt trigger mode
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| Format: { level | edge | high | low }
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|
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| acpi_irq_balance [HW,ACPI]
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| ACPI will balance active IRQs
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| default in APIC mode
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|
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| acpi_irq_nobalance [HW,ACPI]
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| ACPI will not move active IRQs (default)
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| default in PIC mode
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|
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| acpi_irq_pci= [HW,ACPI] If irq_balance, clear listed IRQs for
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| use by PCI
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| Format: <irq>,<irq>...
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|
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| acpi_irq_isa= [HW,ACPI] If irq_balance, mark listed IRQs used by ISA
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| Format: <irq>,<irq>...
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|
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| acpi_no_auto_ssdt [HW,ACPI] Disable automatic loading of SSDT
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|
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| acpi_os_name= [HW,ACPI] Tell ACPI BIOS the name of the OS
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| Format: To spoof as Windows 98: ="Microsoft Windows"
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|
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| acpi_osi= [HW,ACPI] Modify list of supported OS interface strings
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| acpi_osi="string1" # add string1 -- only one string
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| acpi_osi="!string2" # remove built-in string2
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| acpi_osi= # disable all strings
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|
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| acpi_serialize [HW,ACPI] force serialization of AML methods
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|
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| acpi_skip_timer_override [HW,ACPI]
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| Recognize and ignore IRQ0/pin2 Interrupt Override.
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| For broken nForce2 BIOS resulting in XT-PIC timer.
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| acpi_use_timer_override [HW,ACPI]
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| Use timer override. For some broken Nvidia NF5 boards
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| that require a timer override, but don't have
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| HPET
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|
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| acpi_backlight= [HW,ACPI]
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| acpi_backlight=vendor
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| acpi_backlight=video
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| If set to vendor, prefer vendor specific driver
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| (e.g. thinkpad_acpi, sony_acpi, etc.) instead
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| of the ACPI video.ko driver.
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|
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| acpi_display_output= [HW,ACPI]
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| acpi_display_output=vendor
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| acpi_display_output=video
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| See above.
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|
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| acpi.debug_layer= [HW,ACPI,ACPI_DEBUG]
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| acpi.debug_level= [HW,ACPI,ACPI_DEBUG]
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| Format: <int>
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| CONFIG_ACPI_DEBUG must be enabled to produce any ACPI
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| debug output. Bits in debug_layer correspond to a
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| _COMPONENT in an ACPI source file, e.g.,
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| #define _COMPONENT ACPI_PCI_COMPONENT
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| Bits in debug_level correspond to a level in
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| ACPI_DEBUG_PRINT statements, e.g.,
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| ACPI_DEBUG_PRINT((ACPI_DB_INFO, ...
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| The debug_level mask defaults to "info". See
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| Documentation/acpi/debug.txt for more information about
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| debug layers and levels.
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|
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| Enable processor driver info messages:
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| acpi.debug_layer=0x20000000
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| Enable PCI/PCI interrupt routing info messages:
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| acpi.debug_layer=0x400000
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| Enable AML "Debug" output, i.e., stores to the Debug
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| object while interpreting AML:
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| acpi.debug_layer=0xffffffff acpi.debug_level=0x2
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| Enable all messages related to ACPI hardware:
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| acpi.debug_layer=0x2 acpi.debug_level=0xffffffff
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|
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| Some values produce so much output that the system is
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| unusable. The "log_buf_len" parameter may be useful
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| if you need to capture more output.
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|
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| acpi.power_nocheck= [HW,ACPI]
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| Format: 1/0 enable/disable the check of power state.
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| On some bogus BIOS the _PSC object/_STA object of
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| power resource can't return the correct device power
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| state. In such case it is unneccessary to check its
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| power state again in power transition.
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| 1 : disable the power state check
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|
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| acpi_pm_good [X86-32,X86-64]
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| Override the pmtimer bug detection: force the kernel
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| to assume that this machine's pmtimer latches its value
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| and always returns good values.
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|
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| agp= [AGP]
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| { off | try_unsupported }
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| off: disable AGP support
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| try_unsupported: try to drive unsupported chipsets
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| (may crash computer or cause data corruption)
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|
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| enable_timer_pin_1 [i386,x86-64]
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| Enable PIN 1 of APIC timer
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| Can be useful to work around chipset bugs
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| (in particular on some ATI chipsets).
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| The kernel tries to set a reasonable default.
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|
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| disable_timer_pin_1 [i386,x86-64]
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| Disable PIN 1 of APIC timer
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| Can be useful to work around chipset bugs.
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|
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| ad1848= [HW,OSS]
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| Format: <io>,<irq>,<dma>,<dma2>,<type>
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|
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| advansys= [HW,SCSI]
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| See header of drivers/scsi/advansys.c.
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|
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| advwdt= [HW,WDT] Advantech WDT
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| Format: <iostart>,<iostop>
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|
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| aedsp16= [HW,OSS] Audio Excel DSP 16
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| Format: <io>,<irq>,<dma>,<mss_io>,<mpu_io>,<mpu_irq>
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| See also header of sound/oss/aedsp16.c.
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|
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| aha152x= [HW,SCSI]
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| See Documentation/scsi/aha152x.txt.
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|
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| aha1542= [HW,SCSI]
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| Format: <portbase>[,<buson>,<busoff>[,<dmaspeed>]]
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|
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| aic7xxx= [HW,SCSI]
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| See Documentation/scsi/aic7xxx.txt.
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|
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| aic79xx= [HW,SCSI]
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| See Documentation/scsi/aic79xx.txt.
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|
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| amd_iommu= [HW,X86-84]
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| Pass parameters to the AMD IOMMU driver in the system.
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| Possible values are:
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| isolate - enable device isolation (each device, as far
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| as possible, will get its own protection
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| domain) [default]
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| share - put every device behind one IOMMU into the
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| same protection domain
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| fullflush - enable flushing of IO/TLB entries when
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| they are unmapped. Otherwise they are
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| flushed before they will be reused, which
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| is a lot of faster
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|
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| amd_iommu_size= [HW,X86-64]
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| Define the size of the aperture for the AMD IOMMU
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| driver. Possible values are:
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| '32M', '64M' (default), '128M', '256M', '512M', '1G'
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|
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| amijoy.map= [HW,JOY] Amiga joystick support
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| Map of devices attached to JOY0DAT and JOY1DAT
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| Format: <a>,<b>
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| See also Documentation/kernel/input/joystick.txt
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|
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| analog.map= [HW,JOY] Analog joystick and gamepad support
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| Specifies type or capabilities of an analog joystick
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| connected to one of 16 gameports
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| Format: <type1>,<type2>,..<type16>
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|
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| apc= [HW,SPARC]
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| Power management functions (SPARCstation-4/5 + deriv.)
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| Format: noidle
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| Disable APC CPU standby support. SPARCstation-Fox does
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| not play well with APC CPU idle - disable it if you have
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| APC and your system crashes randomly.
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|
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| apic= [APIC,i386] Advanced Programmable Interrupt Controller
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| Change the output verbosity whilst booting
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| Format: { quiet (default) | verbose | debug }
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| Change the amount of debugging information output
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| when initialising the APIC and IO-APIC components.
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|
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| apm= [APM] Advanced Power Management
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| See header of arch/x86/kernel/apm_32.c.
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|
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| arcrimi= [HW,NET] ARCnet - "RIM I" (entirely mem-mapped) cards
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| Format: <io>,<irq>,<nodeID>
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|
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| ataflop= [HW,M68k]
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|
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| atarimouse= [HW,MOUSE] Atari Mouse
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|
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| atascsi= [HW,SCSI] Atari SCSI
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|
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| atkbd.extra= [HW] Enable extra LEDs and keys on IBM RapidAccess,
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| EzKey and similar keyboards
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|
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| atkbd.reset= [HW] Reset keyboard during initialization
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|
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| atkbd.set= [HW] Select keyboard code set
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| Format: <int> (2 = AT (default), 3 = PS/2)
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|
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| atkbd.scroll= [HW] Enable scroll wheel on MS Office and similar
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| keyboards
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|
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| atkbd.softraw= [HW] Choose between synthetic and real raw mode
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| Format: <bool> (0 = real, 1 = synthetic (default))
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|
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| atkbd.softrepeat= [HW]
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| Use software keyboard repeat
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|
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| autotest [IA64]
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|
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| baycom_epp= [HW,AX25]
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| Format: <io>,<mode>
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|
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| baycom_par= [HW,AX25] BayCom Parallel Port AX.25 Modem
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| Format: <io>,<mode>
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| See header of drivers/net/hamradio/baycom_par.c.
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|
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| baycom_ser_fdx= [HW,AX25]
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| BayCom Serial Port AX.25 Modem (Full Duplex Mode)
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| Format: <io>,<irq>,<mode>[,<baud>]
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| See header of drivers/net/hamradio/baycom_ser_fdx.c.
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|
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| baycom_ser_hdx= [HW,AX25]
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| BayCom Serial Port AX.25 Modem (Half Duplex Mode)
| |
| Format: <io>,<irq>,<mode>
| |
| See header of drivers/net/hamradio/baycom_ser_hdx.c.
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|
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| boot_delay= Milliseconds to delay each printk during boot.
| |
| Values larger than 10 seconds (10000) are changed to
| |
| no delay (0).
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| Format: integer
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|
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| bootmem_debug [KNL] Enable bootmem allocator debug messages.
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|
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| bttv.card= [HW,V4L] bttv (bt848 + bt878 based grabber cards)
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| bttv.radio= Most important insmod options are available as
| |
| kernel args too.
| |
| bttv.pll= See Documentation/video4linux/bttv/Insmod-options
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| bttv.tuner= and Documentation/video4linux/bttv/CARDLIST
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|
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| BusLogic= [HW,SCSI]
| |
| See drivers/scsi/BusLogic.c, comment before function
| |
| BusLogic_ParseDriverOptions().
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|
| |
| c101= [NET] Moxa C101 synchronous serial card
| |
|
| |
| cachesize= [BUGS=X86-32] Override level 2 CPU cache size detection.
| |
| Sometimes CPU hardware bugs make them report the cache
| |
| size incorrectly. The kernel will attempt work arounds
| |
| to fix known problems, but for some CPUs it is not
| |
| possible to determine what the correct size should be.
| |
| This option provides an override for these situations.
| |
|
| |
| security= [SECURITY] Choose a security module to enable at boot.
| |
| If this boot parameter is not specified, only the first
| |
| security module asking for security registration will be
| |
| loaded. An invalid security module name will be treated
| |
| as if no module has been chosen.
| |
|
| |
| capability.disable=
| |
| [SECURITY] Disable capabilities. This would normally
| |
| be used only if an alternative security model is to be
| |
| configured. Potentially dangerous and should only be
| |
| used if you are entirely sure of the consequences.
| |
|
| |
| ccw_timeout_log [S390]
| |
| See Documentation/s390/CommonIO for details.
| |
|
| |
| cgroup_disable= [KNL] Disable a particular controller
| |
| Format: {name of the controller(s) to disable}
| |
| {Currently supported controllers - "memory"}
| |
|
| |
| checkreqprot [SELINUX] Set initial checkreqprot flag value.
| |
| Format: { "0" | "1" }
| |
| See security/selinux/Kconfig help text.
| |
| 0 -- check protection applied by kernel (includes
| |
| any implied execute protection).
| |
| 1 -- check protection requested by application.
| |
| Default value is set via a kernel config option.
| |
| Value can be changed at runtime via
| |
| /selinux/checkreqprot.
| |
|
| |
| cio_ignore= [S390]
| |
| See Documentation/s390/CommonIO for details.
| |
|
| |
| clock= [BUGS=X86-32, HW] gettimeofday clocksource override.
| |
| [Deprecated]
| |
| Forces specified clocksource (if available) to be used
| |
| when calculating gettimeofday(). If specified
| |
| clocksource is not available, it defaults to PIT.
| |
| Format: { pit | tsc | cyclone | pmtmr }
| |
|
| |
| clocksource= [GENERIC_TIME] Override the default clocksource
| |
| Format: <string>
| |
| Override the default clocksource and use the clocksource
| |
| with the name specified.
| |
| Some clocksource names to choose from, depending on
| |
| the platform:
| |
| [all] jiffies (this is the base, fallback clocksource)
| |
| [ACPI] acpi_pm
| |
| [ARM] imx_timer1,OSTS,netx_timer,mpu_timer2,
| |
| pxa_timer,timer3,32k_counter,timer0_1
| |
| [AVR32] avr32
| |
| [X86-32] pit,hpet,tsc,vmi-timer;
| |
| scx200_hrt on Geode; cyclone on IBM x440
| |
| [MIPS] MIPS
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| [PARISC] cr16
| |
| [S390] tod
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| [SH] SuperH
| |
| [SPARC64] tick
| |
| [X86-64] hpet,tsc
| |
|
| |
| clearcpuid=BITNUM [X86]
| |
| Disable CPUID feature X for the kernel. See
| |
| arch/x86/include/asm/cpufeature.h for the valid bit
| |
| numbers. Note the Linux specific bits are not necessarily
| |
| stable over kernel options, but the vendor specific
| |
| ones should be.
| |
| Also note that user programs calling CPUID directly
| |
| or using the feature without checking anything
| |
| will still see it. This just prevents it from
| |
| being used by the kernel or shown in /proc/cpuinfo.
| |
| Also note the kernel might malfunction if you disable
| |
| some critical bits.
| |
|
| |
| code_bytes [IA32/X86_64] How many bytes of object code to print
| |
| in an oops report.
| |
| Range: 0 - 8192
| |
| Default: 64
| |
|
| |
| hpet= [X86-32,HPET] option to control HPET usage
| |
| Format: { enable (default) | disable | force }
| |
| disable: disable HPET and use PIT instead
| |
| force: allow force enabled of undocumented chips (ICH4,
| |
| VIA, nVidia)
| |
|
| |
| com20020= [HW,NET] ARCnet - COM20020 chipset
| |
| Format:
| |
| <io>[,<irq>[,<nodeID>[,<backplane>[,<ckp>[,<timeout>]]]]]
| |
|
| |
| com90io= [HW,NET] ARCnet - COM90xx chipset (IO-mapped buffers)
| |
| Format: <io>[,<irq>]
| |
|
| |
| com90xx= [HW,NET]
| |
| ARCnet - COM90xx chipset (memory-mapped buffers)
| |
| Format: <io>[,<irq>[,<memstart>]]
| |
|
| |
| condev= [HW,S390] console device
| |
| conmode=
| |
|
| |
| console= [KNL] Output console device and options.
| |
|
| |
| tty<n> Use the virtual console device <n>.
| |
|
| |
| ttyS<n>[,options]
| |
| ttyUSB0[,options]
| |
| Use the specified serial port. The options are of
| |
| the form "bbbbpnf", where "bbbb" is the baud rate,
| |
| "p" is parity ("n", "o", or "e"), "n" is number of
| |
| bits, and "f" is flow control ("r" for RTS or
| |
| omit it). Default is "9600n8".
| |
|
| |
| See Documentation/serial-console.txt for more
| |
| information. See
| |
| Documentation/networking/netconsole.txt for an
| |
| alternative.
| |
|
| |
| uart[8250],io,<addr>[,options]
| |
| uart[8250],mmio,<addr>[,options]
| |
| Start an early, polled-mode console on the 8250/16550
| |
| UART at the specified I/O port or MMIO address,
| |
| switching to the matching ttyS device later. The
| |
| options are the same as for ttyS, above.
| |
|
| |
| If the device connected to the port is not a TTY but a braille
| |
| device, prepend "brl," before the device type, for instance
| |
| console=brl,ttyS0
| |
| For now, only VisioBraille is supported.
| |
|
| |
| earlycon= [KNL] Output early console device and options.
| |
| uart[8250],io,<addr>[,options]
| |
| uart[8250],mmio,<addr>[,options]
| |
| Start an early, polled-mode console on the 8250/16550
| |
| UART at the specified I/O port or MMIO address.
| |
| The options are the same as for ttyS, above.
| |
|
| |
| no_console_suspend
| |
| [HW] Never suspend the console
| |
| Disable suspending of consoles during suspend and
| |
| hibernate operations. Once disabled, debugging
| |
| messages can reach various consoles while the rest
| |
| of the system is being put to sleep (ie, while
| |
| debugging driver suspend/resume hooks). This may
| |
| not work reliably with all consoles, but is known
| |
| to work with serial and VGA consoles.
| |
|
| |
| coredump_filter=
| |
| [KNL] Change the default value for
| |
| /proc/<pid>/coredump_filter.
| |
| See also Documentation/filesystems/proc.txt.
| |
|
| |
| cpcihp_generic= [HW,PCI] Generic port I/O CompactPCI driver
| |
| Format:
| |
| <first_slot>,<last_slot>,<port>,<enum_bit>[,<debug>]
| |
|
| |
| crashkernel=nn[KMG]@ss[KMG]
| |
| [KNL] Reserve a chunk of physical memory to
| |
| hold a kernel to switch to with kexec on panic.
| |
|
| |
| crashkernel=range1:size1[,range2:size2,...][@offset]
| |
| [KNL] Same as above, but depends on the memory
| |
| in the running system. The syntax of range is
| |
| start-[end] where start and end are both
| |
| a memory unit (amount[KMG]). See also
| |
| Documentation/kdump/kdump.txt for a example.
| |
|
| |
| cs89x0_dma= [HW,NET]
| |
| Format: <dma>
| |
|
| |
| cs89x0_media= [HW,NET]
| |
| Format: { rj45 | aui | bnc }
| |
|
| |
| dasd= [HW,NET]
| |
| See header of drivers/s390/block/dasd_devmap.c.
| |
|
| |
| db9.dev[2|3]= [HW,JOY] Multisystem joystick support via parallel port
| |
| (one device per port)
| |
| Format: <port#>,<type>
| |
| See also Documentation/input/joystick-parport.txt
| |
|
| |
| debug [KNL] Enable kernel debugging (events log level).
| |
|
| |
| debug_locks_verbose=
| |
| [KNL] verbose self-tests
| |
| Format=<0|1>
| |
| Print debugging info while doing the locking API
| |
| self-tests.
| |
| We default to 0 (no extra messages), setting it to
| |
| 1 will print _a lot_ more information - normally
| |
| only useful to kernel developers.
| |
|
| |
| debug_objects [KNL] Enable object debugging
| |
|
| |
| debugpat [X86] Enable PAT debugging
| |
|
| |
| decnet.addr= [HW,NET]
| |
| Format: <area>[,<node>]
| |
| See also Documentation/networking/decnet.txt.
| |
|
| |
| vt.default_blu= [VT]
| |
| Format: <blue0>,<blue1>,<blue2>,...,<blue15>
| |
| Change the default blue palette of the console.
| |
| This is a 16-member array composed of values
| |
| ranging from 0-255.
| |
|
| |
| vt.default_grn= [VT]
| |
| Format: <green0>,<green1>,<green2>,...,<green15>
| |
| Change the default green palette of the console.
| |
| This is a 16-member array composed of values
| |
| ranging from 0-255.
| |
|
| |
| vt.default_red= [VT]
| |
| Format: <red0>,<red1>,<red2>,...,<red15>
| |
| Change the default red palette of the console.
| |
| This is a 16-member array composed of values
| |
| ranging from 0-255.
| |
|
| |
| vt.default_utf8=
| |
| [VT]
| |
| Format=<0|1>
| |
| Set system-wide default UTF-8 mode for all tty's.
| |
| Default is 1, i.e. UTF-8 mode is enabled for all
| |
| newly opened terminals.
| |
|
| |
| dhash_entries= [KNL]
| |
| Set number of hash buckets for dentry cache.
| |
|
| |
| digi= [HW,SERIAL]
| |
| IO parameters + enable/disable command.
| |
|
| |
| digiepca= [HW,SERIAL]
| |
| See drivers/char/README.epca and
| |
| Documentation/serial/digiepca.txt.
| |
|
| |
| disable_mtrr_cleanup [X86]
| |
| enable_mtrr_cleanup [X86]
| |
| The kernel tries to adjust MTRR layout from continuous
| |
| to discrete, to make X server driver able to add WB
| |
| entry later. This parameter enables/disables that.
| |
|
| |
| mtrr_chunk_size=nn[KMG] [X86]
| |
| used for mtrr cleanup. It is largest continous chunk
| |
| that could hold holes aka. UC entries.
| |
|
| |
| mtrr_gran_size=nn[KMG] [X86]
| |
| Used for mtrr cleanup. It is granularity of mtrr block.
| |
| Default is 1.
| |
| Large value could prevent small alignment from
| |
| using up MTRRs.
| |
|
| |
| mtrr_spare_reg_nr=n [X86]
| |
| Format: <integer>
| |
| Range: 0,7 : spare reg number
| |
| Default : 1
| |
| Used for mtrr cleanup. It is spare mtrr entries number.
| |
| Set to 2 or more if your graphical card needs more.
| |
|
| |
| disable_mtrr_trim [X86, Intel and AMD only]
| |
| By default the kernel will trim any uncacheable
| |
| memory out of your available memory pool based on
| |
| MTRR settings. This parameter disables that behavior,
| |
| possibly causing your machine to run very slowly.
| |
|
| |
| dmasound= [HW,OSS] Sound subsystem buffers
| |
|
| |
| dscc4.setup= [NET]
| |
|
| |
| dtc3181e= [HW,SCSI]
| |
|
| |
| earlyprintk= [X86-32,X86-64,SH,BLACKFIN]
| |
| earlyprintk=vga
| |
| earlyprintk=serial[,ttySn[,baudrate]]
| |
| earlyprintk=dbgp
| |
|
| |
| Append ",keep" to not disable it when the real console
| |
| takes over.
| |
|
| |
| Only vga or serial or usb debug port at a time.
| |
|
| |
| Currently only ttyS0 and ttyS1 are supported.
| |
|
| |
| Interaction with the standard serial driver is not
| |
| very good.
| |
|
| |
| The VGA output is eventually overwritten by the real
| |
| console.
| |
|
| |
| eata= [HW,SCSI]
| |
|
| |
| edd= [EDD]
| |
| Format: {"off" | "on" | "skip[mbr]"}
| |
|
| |
| eisa_irq_edge= [PARISC,HW]
| |
| See header of drivers/parisc/eisa.c.
| |
|
| |
| elanfreq= [X86-32]
| |
| See comment before function elanfreq_setup() in
| |
| arch/x86/kernel/cpu/cpufreq/elanfreq.c.
| |
|
| |
| elevator= [IOSCHED]
| |
| Format: {"anticipatory" | "cfq" | "deadline" | "noop"}
| |
| See Documentation/block/as-iosched.txt and
| |
| Documentation/block/deadline-iosched.txt for details.
| |
|
| |
| elfcorehdr= [IA64,PPC,SH,X86-32,X86_64]
| |
| Specifies physical address of start of kernel core
| |
| image elf header. Generally kexec loader will
| |
| pass this option to capture kernel.
| |
| See Documentation/kdump/kdump.txt for details.
| |
|
| |
| enforcing [SELINUX] Set initial enforcing status.
| |
| Format: {"0" | "1"}
| |
| See security/selinux/Kconfig help text.
| |
| 0 -- permissive (log only, no denials).
| |
| 1 -- enforcing (deny and log).
| |
| Default value is 0.
| |
| Value can be changed at runtime via /selinux/enforce.
| |
|
| |
| ether= [HW,NET] Ethernet cards parameters
| |
| This option is obsoleted by the "netdev=" option, which
| |
| has equivalent usage. See its documentation for details.
| |
|
| |
| eurwdt= [HW,WDT] Eurotech CPU-1220/1410 onboard watchdog.
| |
| Format: <io>[,<irq>]
| |
|
| |
| failslab=
| |
| fail_page_alloc=
| |
| fail_make_request=[KNL]
| |
| General fault injection mechanism.
| |
| Format: <interval>,<probability>,<space>,<times>
| |
| See also /Documentation/fault-injection/.
| |
|
| |
| fd_mcs= [HW,SCSI]
| |
| See header of drivers/scsi/fd_mcs.c.
| |
|
| |
| fdomain= [HW,SCSI]
| |
| See header of drivers/scsi/fdomain.c.
| |
|
| |
| floppy= [HW]
| |
| See Documentation/blockdev/floppy.txt.
| |
|
| |
| force_pal_cache_flush
| |
| [IA-64] Avoid check_sal_cache_flush which may hang on
| |
| buggy SAL_CACHE_FLUSH implementations. Using this
| |
| parameter will force ia64_sal_cache_flush to call
| |
| ia64_pal_cache_flush instead of SAL_CACHE_FLUSH.
| |
|
| |
| ftrace=[tracer]
| |
| [ftrace] will set and start the specified tracer
| |
| as early as possible in order to facilitate early
| |
| boot debugging.
| |
|
| |
| ftrace_dump_on_oops
| |
| [ftrace] will dump the trace buffers on oops.
| |
|
| |
| gamecon.map[2|3]=
| |
| [HW,JOY] Multisystem joystick and NES/SNES/PSX pad
| |
| support via parallel port (up to 5 devices per port)
| |
| Format: <port#>,<pad1>,<pad2>,<pad3>,<pad4>,<pad5>
| |
| See also Documentation/input/joystick-parport.txt
| |
|
| |
| gamma= [HW,DRM]
| |
|
| |
| gart_fix_e820= [X86_64] disable the fix e820 for K8 GART
| |
| Format: off | on
| |
| default: on
| |
|
| |
| gdth= [HW,SCSI]
| |
| See header of drivers/scsi/gdth.c.
| |
|
| |
| gpt [EFI] Forces disk with valid GPT signature but
| |
| invalid Protective MBR to be treated as GPT.
| |
|
| |
| gvp11= [HW,SCSI]
| |
|
| |
| hashdist= [KNL,NUMA] Large hashes allocated during boot
| |
| are distributed across NUMA nodes. Defaults on
| |
| for IA-64, off otherwise.
| |
| Format: 0 | 1 (for off | on)
| |
|
| |
| hcl= [IA-64] SGI's Hardware Graph compatibility layer
| |
|
| |
| hd= [EIDE] (E)IDE hard drive subsystem geometry
| |
| Format: <cyl>,<head>,<sect>
| |
|
| |
| highmem=nn[KMG] [KNL,BOOT] forces the highmem zone to have an exact
| |
| size of <nn>. This works even on boxes that have no
| |
| highmem otherwise. This also works to reduce highmem
| |
| size on bigger boxes.
| |
|
| |
| highres= [KNL] Enable/disable high resolution timer mode.
| |
| Valid parameters: "on", "off"
| |
| Default: "on"
| |
|
| |
| hisax= [HW,ISDN]
| |
| See Documentation/isdn/README.HiSax.
| |
|
| |
| hugepages= [HW,X86-32,IA-64] HugeTLB pages to allocate at boot.
| |
| hugepagesz= [HW,IA-64,PPC,X86-64] The size of the HugeTLB pages.
| |
| On x86-64 and powerpc, this option can be specified
| |
| multiple times interleaved with hugepages= to reserve
| |
| huge pages of different sizes. Valid pages sizes on
| |
| x86-64 are 2M (when the CPU supports "pse") and 1G
| |
| (when the CPU supports the "pdpe1gb" cpuinfo flag)
| |
| Note that 1GB pages can only be allocated at boot time
| |
| using hugepages= and not freed afterwards.
| |
| default_hugepagesz=
| |
| [same as hugepagesz=] The size of the default
| |
| HugeTLB page size. This is the size represented by
| |
| the legacy /proc/ hugepages APIs, used for SHM, and
| |
| default size when mounting hugetlbfs filesystems.
| |
| Defaults to the default architecture's huge page size
| |
| if not specified.
| |
|
| |
| hlt [BUGS=ARM,SH]
| |
|
| |
| hvc_iucv= [S390] Number of z/VM IUCV hypervisor console (HVC)
| |
| terminal devices. Valid values: 0..8
| |
|
| |
| i8042.debug [HW] Toggle i8042 debug mode
| |
| i8042.direct [HW] Put keyboard port into non-translated mode
| |
| i8042.dumbkbd [HW] Pretend that controller can only read data from
| |
| keyboard and cannot control its state
| |
| (Don't attempt to blink the leds)
| |
| i8042.noaux [HW] Don't check for auxiliary (== mouse) port
| |
| i8042.nokbd [HW] Don't check/create keyboard port
| |
| i8042.noloop [HW] Disable the AUX Loopback command while probing
| |
| for the AUX port
| |
| i8042.nomux [HW] Don't check presence of an active multiplexing
| |
| controller
| |
| i8042.nopnp [HW] Don't use ACPIPnP / PnPBIOS to discover KBD/AUX
| |
| controllers
| |
| i8042.panicblink=
| |
| [HW] Frequency with which keyboard LEDs should blink
| |
| when kernel panics (default is 0.5 sec)
| |
| i8042.reset [HW] Reset the controller during init and cleanup
| |
| i8042.unlock [HW] Unlock (ignore) the keylock
| |
|
| |
| i810= [HW,DRM]
| |
|
| |
| i8k.ignore_dmi [HW] Continue probing hardware even if DMI data
| |
| indicates that the driver is running on unsupported
| |
| hardware.
| |
| i8k.force [HW] Activate i8k driver even if SMM BIOS signature
| |
| does not match list of supported models.
| |
| i8k.power_status
| |
| [HW] Report power status in /proc/i8k
| |
| (disabled by default)
| |
| i8k.restricted [HW] Allow controlling fans only if SYS_ADMIN
| |
| capability is set.
| |
|
| |
| ibmmcascsi= [HW,MCA,SCSI] IBM MicroChannel SCSI adapter
| |
| See Documentation/mca.txt.
| |
|
| |
| icn= [HW,ISDN]
| |
| Format: <io>[,<membase>[,<icn_id>[,<icn_id2>]]]
| |
|
| |
| ide-core.nodma= [HW] (E)IDE subsystem
| |
| Format: =0.0 to prevent dma on hda, =0.1 hdb =1.0 hdc
| |
| .vlb_clock .pci_clock .noflush .noprobe .nowerr .cdrom
| |
| .chs .ignore_cable are additional options
| |
| See Documentation/ide/ide.txt.
| |
|
| |
| idebus= [HW] (E)IDE subsystem - VLB/PCI bus speed
| |
| See Documentation/ide/ide.txt.
| |
|
| |
| idle= [X86]
| |
| Format: idle=poll, idle=mwait, idle=halt, idle=nomwait
| |
| Poll forces a polling idle loop that can slightly
| |
| improve the performance of waking up a idle CPU, but
| |
| will use a lot of power and make the system run hot.
| |
| Not recommended.
| |
| idle=mwait: On systems which support MONITOR/MWAIT but
| |
| the kernel chose to not use it because it doesn't save
| |
| as much power as a normal idle loop, use the
| |
| MONITOR/MWAIT idle loop anyways. Performance should be
| |
| the same as idle=poll.
| |
| idle=halt: Halt is forced to be used for CPU idle.
| |
| In such case C2/C3 won't be used again.
| |
| idle=nomwait: Disable mwait for CPU C-states
| |
|
| |
| ide-pci-generic.all-generic-ide [HW] (E)IDE subsystem
| |
| Claim all unknown PCI IDE storage controllers.
| |
|
| |
| ignore_loglevel [KNL]
| |
| Ignore loglevel setting - this will print /all/
| |
| kernel messages to the console. Useful for debugging.
| |
|
| |
| ihash_entries= [KNL]
| |
| Set number of hash buckets for inode cache.
| |
|
| |
| in2000= [HW,SCSI]
| |
| See header of drivers/scsi/in2000.c.
| |
|
| |
| init= [KNL]
| |
| Format: <full_path>
| |
| Run specified binary instead of /sbin/init as init
| |
| process.
| |
|
| |
| initcall_debug [KNL] Trace initcalls as they are executed. Useful
| |
| for working out where the kernel is dying during
| |
| startup.
| |
|
| |
| initrd= [BOOT] Specify the location of the initial ramdisk
| |
|
| |
| inport.irq= [HW] Inport (ATI XL and Microsoft) busmouse driver
| |
| Format: <irq>
| |
|
| |
| inttest= [IA64]
| |
|
| |
| iomem= Disable strict checking of access to MMIO memory
| |
| strict regions from userspace.
| |
| relaxed
| |
|
| |
| iommu= [x86]
| |
| off
| |
| force
| |
| noforce
| |
| biomerge
| |
| panic
| |
| nopanic
| |
| merge
| |
| nomerge
| |
| forcesac
| |
| soft
| |
|
| |
|
| |
| intel_iommu= [DMAR] Intel IOMMU driver (DMAR) option
| |
| on
| |
| Enable intel iommu driver.
| |
| off
| |
| Disable intel iommu driver.
| |
| igfx_off [Default Off]
| |
| By default, gfx is mapped as normal device. If a gfx
| |
| device has a dedicated DMAR unit, the DMAR unit is
| |
| bypassed by not enabling DMAR with this option. In
| |
| this case, gfx device will use physical address for
| |
| DMA.
| |
| forcedac [x86_64]
| |
| With this option iommu will not optimize to look
| |
| for io virtual address below 32 bit forcing dual
| |
| address cycle on pci bus for cards supporting greater
| |
| than 32 bit addressing. The default is to look
| |
| for translation below 32 bit and if not available
| |
| then look in the higher range.
| |
| strict [Default Off]
| |
| With this option on every unmap_single operation will
| |
| result in a hardware IOTLB flush operation as opposed
| |
| to batching them for performance.
| |
|
| |
| io_delay= [X86-32,X86-64] I/O delay method
| |
| 0x80
| |
| Standard port 0x80 based delay
| |
| 0xed
| |
| Alternate port 0xed based delay (needed on some systems)
| |
| udelay
| |
| Simple two microseconds delay
| |
| none
| |
| No delay
| |
|
| |
| io7= [HW] IO7 for Marvel based alpha systems
| |
| See comment before marvel_specify_io7 in
| |
| arch/alpha/kernel/core_marvel.c.
| |
|
| |
| ip= [IP_PNP]
| |
| See Documentation/filesystems/nfsroot.txt.
| |
|
| |
| ip2= [HW] Set IO/IRQ pairs for up to 4 IntelliPort boards
| |
| See comment before ip2_setup() in
| |
| drivers/char/ip2/ip2base.c.
| |
|
| |
| ips= [HW,SCSI] Adaptec / IBM ServeRAID controller
| |
| See header of drivers/scsi/ips.c.
| |
|
| |
| ports= [IP_VS_FTP] IPVS ftp helper module
| |
| Default is 21.
| |
| Up to 8 (IP_VS_APP_MAX_PORTS) ports
| |
| may be specified.
| |
| Format: <port>,<port>....
| |
|
| |
| irqfixup [HW]
| |
| When an interrupt is not handled search all handlers
| |
| for it. Intended to get systems with badly broken
| |
| firmware running.
| |
|
| |
| irqpoll [HW]
| |
| When an interrupt is not handled search all handlers
| |
| for it. Also check all handlers each timer
| |
| interrupt. Intended to get systems with badly broken
| |
| firmware running.
| |
|
| |
| isapnp= [ISAPNP]
| |
| Format: <RDP>,<reset>,<pci_scan>,<verbosity>
| |
|
| |
| isolcpus= [KNL,SMP] Isolate CPUs from the general scheduler.
| |
| Format:
| |
| <cpu number>,...,<cpu number>
| |
| or
| |
| <cpu number>-<cpu number>
| |
| (must be a positive range in ascending order)
| |
| or a mixture
| |
| <cpu number>,...,<cpu number>-<cpu number>
| |
|
| |
| This option can be used to specify one or more CPUs
| |
| to isolate from the general SMP balancing and scheduling
| |
| algorithms. You can move a process onto or off an
| |
| "isolated" CPU via the CPU affinity syscalls or cpuset.
| |
| <cpu number> begins at 0 and the maximum value is
| |
| "number of CPUs in system - 1".
| |
|
| |
| This option is the preferred way to isolate CPUs. The
| |
| alternative -- manually setting the CPU mask of all
| |
| tasks in the system -- can cause problems and
| |
| suboptimal load balancer performance.
| |
|
| |
| iucv= [HW,NET]
| |
|
| |
| js= [HW,JOY] Analog joystick
| |
| See Documentation/input/joystick.txt.
| |
|
| |
| kernelcore=nn[KMG] [KNL,X86-32,IA-64,PPC,X86-64] This parameter
| |
| specifies the amount of memory usable by the kernel
| |
| for non-movable allocations. The requested amount is
| |
| spread evenly throughout all nodes in the system. The
| |
| remaining memory in each node is used for Movable
| |
| pages. In the event, a node is too small to have both
| |
| kernelcore and Movable pages, kernelcore pages will
| |
| take priority and other nodes will have a larger number
| |
| of kernelcore pages. The Movable zone is used for the
| |
| allocation of pages that may be reclaimed or moved
| |
| by the page migration subsystem. This means that
| |
| HugeTLB pages may not be allocated from this zone.
| |
| Note that allocations like PTEs-from-HighMem still
| |
| use the HighMem zone if it exists, and the Normal
| |
| zone if it does not.
| |
|
| |
| movablecore=nn[KMG] [KNL,X86-32,IA-64,PPC,X86-64] This parameter
| |
| is similar to kernelcore except it specifies the
| |
| amount of memory used for migratable allocations.
| |
| If both kernelcore and movablecore is specified,
| |
| then kernelcore will be at *least* the specified
| |
| value but may be more. If movablecore on its own
| |
| is specified, the administrator must be careful
| |
| that the amount of memory usable for all allocations
| |
| is not too small.
| |
|
| |
| keepinitrd [HW,ARM]
| |
|
| |
| kstack=N [X86-32,X86-64] Print N words from the kernel stack
| |
| in oops dumps.
| |
|
| |
| kgdboc= [HW] kgdb over consoles.
| |
| Requires a tty driver that supports console polling.
| |
| (only serial suported for now)
| |
| Format: <serial_device>[,baud]
| |
|
| |
| kmac= [MIPS] korina ethernet MAC address.
| |
| Configure the RouterBoard 532 series on-chip
| |
| Ethernet adapter MAC address.
| |
|
| |
| l2cr= [PPC]
| |
|
| |
| l3cr= [PPC]
| |
|
| |
| lapic [X86-32,APIC] Enable the local APIC even if BIOS
| |
| disabled it.
| |
|
| |
| lapic_timer_c2_ok [X86-32,x86-64,APIC] trust the local apic timer
| |
| in C2 power state.
| |
|
| |
| libata.dma= [LIBATA] DMA control
| |
| libata.dma=0 Disable all PATA and SATA DMA
| |
| libata.dma=1 PATA and SATA Disk DMA only
| |
| libata.dma=2 ATAPI (CDROM) DMA only
| |
| libata.dma=4 Compact Flash DMA only
| |
| Combinations also work, so libata.dma=3 enables DMA
| |
| for disks and CDROMs, but not CFs.
| |
|
| |
| libata.noacpi [LIBATA] Disables use of ACPI in libata suspend/resume
| |
| when set.
| |
| Format: <int>
| |
|
| |
| libata.force= [LIBATA] Force configurations. The format is comma
| |
| separated list of "[ID:]VAL" where ID is
| |
| PORT[:DEVICE]. PORT and DEVICE are decimal numbers
| |
| matching port, link or device. Basically, it matches
| |
| the ATA ID string printed on console by libata. If
| |
| the whole ID part is omitted, the last PORT and DEVICE
| |
| values are used. If ID hasn't been specified yet, the
| |
| configuration applies to all ports, links and devices.
| |
|
| |
| If only DEVICE is omitted, the parameter applies to
| |
| the port and all links and devices behind it. DEVICE
| |
| number of 0 either selects the first device or the
| |
| first fan-out link behind PMP device. It does not
| |
| select the host link. DEVICE number of 15 selects the
| |
| host link and device attached to it.
| |
|
| |
| The VAL specifies the configuration to force. As long
| |
| as there's no ambiguity shortcut notation is allowed.
| |
| For example, both 1.5 and 1.5G would work for 1.5Gbps.
| |
| The following configurations can be forced.
| |
|
| |
| * Cable type: 40c, 80c, short40c, unk, ign or sata.
| |
| Any ID with matching PORT is used.
| |
|
| |
| * SATA link speed limit: 1.5Gbps or 3.0Gbps.
| |
|
| |
| * Transfer mode: pio[0-7], mwdma[0-4] and udma[0-7].
| |
| udma[/][16,25,33,44,66,100,133] notation is also
| |
| allowed.
| |
|
| |
| * [no]ncq: Turn on or off NCQ.
| |
|
| |
| * nohrst, nosrst, norst: suppress hard, soft
| |
| and both resets.
| |
|
| |
| If there are multiple matching configurations changing
| |
| the same attribute, the last one is used.
| |
|
| |
| lmb=debug [KNL] Enable lmb debug messages.
| |
|
| |
| load_ramdisk= [RAM] List of ramdisks to load from floppy
| |
| See Documentation/blockdev/ramdisk.txt.
| |
|
| |
| lockd.nlm_grace_period=P [NFS] Assign grace period.
| |
| Format: <integer>
| |
|
| |
| lockd.nlm_tcpport=N [NFS] Assign TCP port.
| |
| Format: <integer>
| |
|
| |
| lockd.nlm_timeout=T [NFS] Assign timeout value.
| |
| Format: <integer>
| |
|
| |
| lockd.nlm_udpport=M [NFS] Assign UDP port.
| |
| Format: <integer>
| |
|
| |
| logibm.irq= [HW,MOUSE] Logitech Bus Mouse Driver
| |
| Format: <irq>
| |
|
| |
| loglevel= All Kernel Messages with a loglevel smaller than the
| |
| console loglevel will be printed to the console. It can
| |
| also be changed with klogd or other programs. The
| |
| loglevels are defined as follows:
| |
|
| |
| 0 (KERN_EMERG) system is unusable
| |
| 1 (KERN_ALERT) action must be taken immediately
| |
| 2 (KERN_CRIT) critical conditions
| |
| 3 (KERN_ERR) error conditions
| |
| 4 (KERN_WARNING) warning conditions
| |
| 5 (KERN_NOTICE) normal but significant condition
| |
| 6 (KERN_INFO) informational
| |
| 7 (KERN_DEBUG) debug-level messages
| |
|
| |
| log_buf_len=n Sets the size of the printk ring buffer, in bytes.
| |
| Format: { n | nk | nM }
| |
| n must be a power of two. The default size
| |
| is set in the kernel config file.
| |
|
| |
| logo.nologo [FB] Disables display of the built-in Linux logo.
| |
| This may be used to provide more screen space for
| |
| kernel log messages and is useful when debugging
| |
| kernel boot problems.
| |
|
| |
| lp=0 [LP] Specify parallel ports to use, e.g,
| |
| lp=port[,port...] lp=none,parport0 (lp0 not configured, lp1 uses
| |
| lp=reset first parallel port). 'lp=0' disables the
| |
| lp=auto printer driver. 'lp=reset' (which can be
| |
| specified in addition to the ports) causes
| |
| attached printers to be reset. Using
| |
| lp=port1,port2,... specifies the parallel ports
| |
| to associate lp devices with, starting with
| |
| lp0. A port specification may be 'none' to skip
| |
| that lp device, or a parport name such as
| |
| 'parport0'. Specifying 'lp=auto' instead of a
| |
| port specification list means that device IDs
| |
| from each port should be examined, to see if
| |
| an IEEE 1284-compliant printer is attached; if
| |
| so, the driver will manage that printer.
| |
| See also header of drivers/char/lp.c.
| |
|
| |
| lpj=n [KNL]
| |
| Sets loops_per_jiffy to given constant, thus avoiding
| |
| time-consuming boot-time autodetection (up to 250 ms per
| |
| CPU). 0 enables autodetection (default). To determine
| |
| the correct value for your kernel, boot with normal
| |
| autodetection and see what value is printed. Note that
| |
| on SMP systems the preset will be applied to all CPUs,
| |
| which is likely to cause problems if your CPUs need
| |
| significantly divergent settings. An incorrect value
| |
| will cause delays in the kernel to be wrong, leading to
| |
| unpredictable I/O errors and other breakage. Although
| |
| unlikely, in the extreme case this might damage your
| |
| hardware.
| |
|
| |
| ltpc= [NET]
| |
| Format: <io>,<irq>,<dma>
| |
|
| |
| mac5380= [HW,SCSI] Format:
| |
| <can_queue>,<cmd_per_lun>,<sg_tablesize>,<hostid>,<use_tags>
| |
|
| |
| machvec= [IA64] Force the use of a particular machine-vector
| |
| (machvec) in a generic kernel.
| |
| Example: machvec=hpzx1_swiotlb
| |
|
| |
| max_loop= [LOOP] Maximum number of loopback devices that can
| |
| be mounted
| |
| Format: <1-256>
| |
|
| |
| maxcpus= [SMP] Maximum number of processors that an SMP kernel
| |
| should make use of. maxcpus=n : n >= 0 limits the
| |
| kernel to using 'n' processors. n=0 is a special case,
| |
| it is equivalent to "nosmp", which also disables
| |
| the IO APIC.
| |
|
| |
| max_addr=nn[KMG] [KNL,BOOT,ia64] All physical memory greater than
| |
| or equal to this physical address is ignored.
| |
|
| |
| max_luns= [SCSI] Maximum number of LUNs to probe.
| |
| Should be between 1 and 2^32-1.
| |
|
| |
| max_report_luns=
| |
| [SCSI] Maximum number of LUNs received.
| |
| Should be between 1 and 16384.
| |
|
| |
| mcatest= [IA-64]
| |
|
| |
| mce [X86-32] Machine Check Exception
| |
|
| |
| mce=option [X86-64] See Documentation/x86/x86_64/boot-options.txt
| |
|
| |
| md= [HW] RAID subsystems devices and level
| |
| See Documentation/md.txt.
| |
|
| |
| mdacon= [MDA]
| |
| Format: <first>,<last>
| |
| Specifies range of consoles to be captured by the MDA.
| |
|
| |
| mem=nn[KMG] [KNL,BOOT] Force usage of a specific amount of memory
| |
| Amount of memory to be used when the kernel is not able
| |
| to see the whole system memory or for test.
| |
| [X86-32] Use together with memmap= to avoid physical
| |
| address space collisions. Without memmap= PCI devices
| |
| could be placed at addresses belonging to unused RAM.
| |
|
| |
| mem=nopentium [BUGS=X86-32] Disable usage of 4MB pages for kernel
| |
| memory.
| |
|
| |
| memchunk=nn[KMG]
| |
| [KNL,SH] Allow user to override the default size for
| |
| per-device physically contiguous DMA buffers.
| |
|
| |
| memmap=exactmap [KNL,X86-32,X86_64] Enable setting of an exact
| |
| E820 memory map, as specified by the user.
| |
| Such memmap=exactmap lines can be constructed based on
| |
| BIOS output or other requirements. See the memmap=nn@ss
| |
| option description.
| |
|
| |
| memmap=nn[KMG]@ss[KMG]
| |
| [KNL] Force usage of a specific region of memory
| |
| Region of memory to be used, from ss to ss+nn.
| |
|
| |
| memmap=nn[KMG]#ss[KMG]
| |
| [KNL,ACPI] Mark specific memory as ACPI data.
| |
| Region of memory to be used, from ss to ss+nn.
| |
|
| |
| memmap=nn[KMG]$ss[KMG]
| |
| [KNL,ACPI] Mark specific memory as reserved.
| |
| Region of memory to be used, from ss to ss+nn.
| |
| Example: Exclude memory from 0x18690000-0x1869ffff
| |
| memmap=64K$0x18690000
| |
| or
| |
| memmap=0x10000$0x18690000
| |
|
| |
| memory_corruption_check=0/1 [X86]
| |
| Some BIOSes seem to corrupt the first 64k of
| |
| memory when doing things like suspend/resume.
| |
| Setting this option will scan the memory
| |
| looking for corruption. Enabling this will
| |
| both detect corruption and prevent the kernel
| |
| from using the memory being corrupted.
| |
| However, its intended as a diagnostic tool; if
| |
| repeatable BIOS-originated corruption always
| |
| affects the same memory, you can use memmap=
| |
| to prevent the kernel from using that memory.
| |
|
| |
| memory_corruption_check_size=size [X86]
| |
| By default it checks for corruption in the low
| |
| 64k, making this memory unavailable for normal
| |
| use. Use this parameter to scan for
| |
| corruption in more or less memory.
| |
|
| |
| memory_corruption_check_period=seconds [X86]
| |
| By default it checks for corruption every 60
| |
| seconds. Use this parameter to check at some
| |
| other rate. 0 disables periodic checking.
| |
|
| |
| memtest= [KNL,X86] Enable memtest
| |
| Format: <integer>
| |
| range: 0,4 : pattern number
| |
| default : 0 <disable>
| |
|
| |
| meye.*= [HW] Set MotionEye Camera parameters
| |
| See Documentation/video4linux/meye.txt.
| |
|
| |
| mfgpt_irq= [IA-32] Specify the IRQ to use for the
| |
| Multi-Function General Purpose Timers on AMD Geode
| |
| platforms.
| |
|
| |
| mfgptfix [X86-32] Fix MFGPT timers on AMD Geode platforms when
| |
| the BIOS has incorrectly applied a workaround. TinyBIOS
| |
| version 0.98 is known to be affected, 0.99 fixes the
| |
| problem by letting the user disable the workaround.
| |
|
| |
| mga= [HW,DRM]
| |
|
| |
| min_addr=nn[KMG] [KNL,BOOT,ia64] All physical memory below this
| |
| physical address is ignored.
| |
|
| |
| mminit_loglevel=
| |
| [KNL] When CONFIG_DEBUG_MEMORY_INIT is set, this
| |
| parameter allows control of the logging verbosity for
| |
| the additional memory initialisation checks. A value
| |
| of 0 disables mminit logging and a level of 4 will
| |
| log everything. Information is printed at KERN_DEBUG
| |
| so loglevel=8 may also need to be specified.
| |
|
| |
| mousedev.tap_time=
| |
| [MOUSE] Maximum time between finger touching and
| |
| leaving touchpad surface for touch to be considered
| |
| a tap and be reported as a left button click (for
| |
| touchpads working in absolute mode only).
| |
| Format: <msecs>
| |
| mousedev.xres= [MOUSE] Horizontal screen resolution, used for devices
| |
| reporting absolute coordinates, such as tablets
| |
| mousedev.yres= [MOUSE] Vertical screen resolution, used for devices
| |
| reporting absolute coordinates, such as tablets
| |
|
| |
| mpu401= [HW,OSS]
| |
| Format: <io>,<irq>
| |
|
| |
| MTD_Partition= [MTD]
| |
| Format: <name>,<region-number>,<size>,<offset>
| |
|
| |
| MTD_Region= [MTD] Format:
| |
| <name>,<region-number>[,<base>,<size>,<buswidth>,<altbuswidth>]
| |
|
| |
| mtdparts= [MTD]
| |
| See drivers/mtd/cmdlinepart.c.
| |
|
| |
| mtdset= [ARM]
| |
| ARM/S3C2412 JIVE boot control
| |
|
| |
| See arch/arm/mach-s3c2412/mach-jive.c
| |
|
| |
| mtouchusb.raw_coordinates=
| |
| [HW] Make the MicroTouch USB driver use raw coordinates
| |
| ('y', default) or cooked coordinates ('n')
| |
|
| |
| n2= [NET] SDL Inc. RISCom/N2 synchronous serial card
| |
|
| |
| NCR_D700= [HW,SCSI]
| |
| See header of drivers/scsi/NCR_D700.c.
| |
|
| |
| ncr5380= [HW,SCSI]
| |
|
| |
| ncr53c400= [HW,SCSI]
| |
|
| |
| ncr53c400a= [HW,SCSI]
| |
|
| |
| ncr53c406a= [HW,SCSI]
| |
|
| |
| ncr53c8xx= [HW,SCSI]
| |
|
| |
| netdev= [NET] Network devices parameters
| |
| Format: <irq>,<io>,<mem_start>,<mem_end>,<name>
| |
| Note that mem_start is often overloaded to mean
| |
| something different and driver-specific.
| |
| This usage is only documented in each driver source
| |
| file if at all.
| |
|
| |
| nf_conntrack.acct=
| |
| [NETFILTER] Enable connection tracking flow accounting
| |
| 0 to disable accounting
| |
| 1 to enable accounting
| |
| Default value depends on CONFIG_NF_CT_ACCT that is
| |
| going to be removed in 2.6.29.
| |
|
| |
| nfsaddrs= [NFS]
| |
| See Documentation/filesystems/nfsroot.txt.
| |
|
| |
| nfsroot= [NFS] nfs root filesystem for disk-less boxes.
| |
| See Documentation/filesystems/nfsroot.txt.
| |
|
| |
| nfs.callback_tcpport=
| |
| [NFS] set the TCP port on which the NFSv4 callback
| |
| channel should listen.
| |
|
| |
| nfs.idmap_cache_timeout=
| |
| [NFS] set the maximum lifetime for idmapper cache
| |
| entries.
| |
|
| |
| nfs.enable_ino64=
| |
| [NFS] enable 64-bit inode numbers.
| |
| If zero, the NFS client will fake up a 32-bit inode
| |
| number for the readdir() and stat() syscalls instead
| |
| of returning the full 64-bit number.
| |
| The default is to return 64-bit inode numbers.
| |
|
| |
| nmi_debug= [KNL,AVR32] Specify one or more actions to take
| |
| when a NMI is triggered.
| |
| Format: [state][,regs][,debounce][,die]
| |
|
| |
| nmi_watchdog= [KNL,BUGS=X86-32,X86-64] Debugging features for SMP kernels
| |
| Format: [panic,][num]
| |
| Valid num: 0,1,2
| |
| 0 - turn nmi_watchdog off
| |
| 1 - use the IO-APIC timer for the NMI watchdog
| |
| 2 - use the local APIC for the NMI watchdog using
| |
| a performance counter. Note: This will use one performance
| |
| counter and the local APIC's performance vector.
| |
| When panic is specified panic when an NMI watchdog timeout occurs.
| |
| This is useful when you use a panic=... timeout and need the box
| |
| quickly up again.
| |
| Instead of 1 and 2 it is possible to use the following
| |
| symbolic names: lapic and ioapic
| |
| Example: nmi_watchdog=2 or nmi_watchdog=panic,lapic
| |
|
| |
| no387 [BUGS=X86-32] Tells the kernel to use the 387 maths
| |
| emulation library even if a 387 maths coprocessor
| |
| is present.
| |
|
| |
| noaliencache [MM, NUMA, SLAB] Disables the allocation of alien
| |
| caches in the slab allocator. Saves per-node memory,
| |
| but will impact performance.
| |
|
| |
| noalign [KNL,ARM]
| |
|
| |
| noapic [SMP,APIC] Tells the kernel to not make use of any
| |
| IOAPICs that may be present in the system.
| |
|
| |
| nobats [PPC] Do not use BATs for mapping kernel lowmem
| |
| on "Classic" PPC cores.
| |
|
| |
| nocache [ARM]
| |
|
| |
| nodelayacct [KNL] Disable per-task delay accounting
| |
|
| |
| nodisconnect [HW,SCSI,M68K] Disables SCSI disconnects.
| |
|
| |
| nodsp [SH] Disable hardware DSP at boot time.
| |
|
| |
| noefi [X86-32,X86-64] Disable EFI runtime services support.
| |
|
| |
| noexec [IA-64]
| |
|
| |
| noexec [X86-32,X86-64]
| |
| On X86-32 available only on PAE configured kernels.
| |
| noexec=on: enable non-executable mappings (default)
| |
| noexec=off: disable non-executable mappings
| |
|
| |
| noexec32 [X86-64]
| |
| This affects only 32-bit executables.
| |
| noexec32=on: enable non-executable mappings (default)
| |
| read doesn't imply executable mappings
| |
| noexec32=off: disable non-executable mappings
| |
| read implies executable mappings
| |
|
| |
| nofpu [SH] Disable hardware FPU at boot time.
| |
|
| |
| nofxsr [BUGS=X86-32] Disables x86 floating point extended
| |
| register save and restore. The kernel will only save
| |
| legacy floating-point registers on task switch.
| |
|
| |
| noclflush [BUGS=X86] Don't use the CLFLUSH instruction
| |
|
| |
| nohlt [BUGS=ARM,SH]
| |
|
| |
| no-hlt [BUGS=X86-32] Tells the kernel that the hlt
| |
| instruction doesn't work correctly and not to
| |
| use it.
| |
|
| |
| no_file_caps Tells the kernel not to honor file capabilities. The
| |
| only way then for a file to be executed with privilege
| |
| is to be setuid root or executed by root.
| |
|
| |
| nohalt [IA-64] Tells the kernel not to use the power saving
| |
| function PAL_HALT_LIGHT when idle. This increases
| |
| power-consumption. On the positive side, it reduces
| |
| interrupt wake-up latency, which may improve performance
| |
| in certain environments such as networked servers or
| |
| real-time systems.
| |
|
| |
| nohz= [KNL] Boottime enable/disable dynamic ticks
| |
| Valid arguments: on, off
| |
| Default: on
| |
|
| |
| noirqdebug [X86-32] Disables the code which attempts to detect and
| |
| disable unhandled interrupt sources.
| |
|
| |
| no_timer_check [X86-32,X86_64,APIC] Disables the code which tests for
| |
| broken timer IRQ sources.
| |
|
| |
| noisapnp [ISAPNP] Disables ISA PnP code.
| |
|
| |
| noinitrd [RAM] Tells the kernel not to load any configured
| |
| initial RAM disk.
| |
|
| |
| nointroute [IA-64]
| |
|
| |
| nojitter [IA64] Disables jitter checking for ITC timers.
| |
|
| |
| nolapic [X86-32,APIC] Do not enable or use the local APIC.
| |
|
| |
| nolapic_timer [X86-32,APIC] Do not use the local APIC timer.
| |
|
| |
| nox2apic [X86-64,APIC] Do not enable x2APIC mode.
| |
|
| |
| x2apic_phys [X86-64,APIC] Use x2apic physical mode instead of
| |
| default x2apic cluster mode on platforms
| |
| supporting x2apic.
| |
|
| |
| noltlbs [PPC] Do not use large page/tlb entries for kernel
| |
| lowmem mapping on PPC40x.
| |
|
| |
| nomca [IA-64] Disable machine check abort handling
| |
|
| |
| nomce [X86-32] Machine Check Exception
| |
|
| |
| nomfgpt [X86-32] Disable Multi-Function General Purpose
| |
| Timer usage (for AMD Geode machines).
| |
|
| |
| noreplace-paravirt [X86-32,PV_OPS] Don't patch paravirt_ops
| |
|
| |
| noreplace-smp [X86-32,SMP] Don't replace SMP instructions
| |
| with UP alternatives
| |
|
| |
| noresidual [PPC] Don't use residual data on PReP machines.
| |
|
| |
| noresume [SWSUSP] Disables resume and restores original swap
| |
| space.
| |
|
| |
| no-scroll [VGA] Disables scrollback.
| |
| This is required for the Braillex ib80-piezo Braille
| |
| reader made by F.H. Papenmeier (Germany).
| |
|
| |
| nosbagart [IA-64]
| |
|
| |
| nosep [BUGS=X86-32] Disables x86 SYSENTER/SYSEXIT support.
| |
|
| |
| nosmp [SMP] Tells an SMP kernel to act as a UP kernel,
| |
| and disable the IO APIC. legacy for "maxcpus=0".
| |
|
| |
| nosoftlockup [KNL] Disable the soft-lockup detector.
| |
|
| |
| noswapaccount [KNL] Disable accounting of swap in memory resource
| |
| controller. (See Documentation/controllers/memory.txt)
| |
|
| |
| nosync [HW,M68K] Disables sync negotiation for all devices.
| |
|
| |
| notsc [BUGS=X86-32] Disable Time Stamp Counter
| |
|
| |
| nousb [USB] Disable the USB subsystem
| |
|
| |
| nowb [ARM]
| |
|
| |
| nptcg= [IA64] Override max number of concurrent global TLB
| |
| purges which is reported from either PAL_VM_SUMMARY or
| |
| SAL PALO.
| |
|
| |
| numa_zonelist_order= [KNL, BOOT] Select zonelist order for NUMA.
| |
| one of ['zone', 'node', 'default'] can be specified
| |
| This can be set from sysctl after boot.
| |
| See Documentation/sysctl/vm.txt for details.
| |
|
| |
| nr_uarts= [SERIAL] maximum number of UARTs to be registered.
| |
|
| |
| ohci1394_dma=early [HW] enable debugging via the ohci1394 driver.
| |
| See Documentation/debugging-via-ohci1394.txt for more
| |
| info.
| |
|
| |
| olpc_ec_timeout= [OLPC] ms delay when issuing EC commands
| |
| Rather than timing out after 20 ms if an EC
| |
| command is not properly ACKed, override the length
| |
| of the timeout. We have interrupts disabled while
| |
| waiting for the ACK, so if this is set too high
| |
| interrupts *may* be lost!
| |
|
| |
| opl3= [HW,OSS]
| |
| Format: <io>
| |
|
| |
| oprofile.timer= [HW]
| |
| Use timer interrupt instead of performance counters
| |
|
| |
| osst= [HW,SCSI] SCSI Tape Driver
| |
| Format: <buffer_size>,<write_threshold>
| |
| See also Documentation/scsi/st.txt.
| |
|
| |
| panic= [KNL] Kernel behaviour on panic
| |
| Format: <timeout>
| |
|
| |
| parkbd.port= [HW] Parallel port number the keyboard adapter is
| |
| connected to, default is 0.
| |
| Format: <parport#>
| |
| parkbd.mode= [HW] Parallel port keyboard adapter mode of operation,
| |
| 0 for XT, 1 for AT (default is AT).
| |
| Format: <mode>
| |
|
| |
| parport= [HW,PPT] Specify parallel ports. 0 disables.
| |
| Format: { 0 | auto | 0xBBB[,IRQ[,DMA]] }
| |
| Use 'auto' to force the driver to use any
| |
| IRQ/DMA settings detected (the default is to
| |
| ignore detected IRQ/DMA settings because of
| |
| possible conflicts). You can specify the base
| |
| address, IRQ, and DMA settings; IRQ and DMA
| |
| should be numbers, or 'auto' (for using detected
| |
| settings on that particular port), or 'nofifo'
| |
| (to avoid using a FIFO even if it is detected).
| |
| Parallel ports are assigned in the order they
| |
| are specified on the command line, starting
| |
| with parport0.
| |
|
| |
| parport_init_mode= [HW,PPT]
| |
| Configure VIA parallel port to operate in
| |
| a specific mode. This is necessary on Pegasos
| |
| computer where firmware has no options for setting
| |
| up parallel port mode and sets it to spp.
| |
| Currently this function knows 686a and 8231 chips.
| |
| Format: [spp|ps2|epp|ecp|ecpepp]
| |
|
| |
| pas2= [HW,OSS] Format:
| |
| <io>,<irq>,<dma>,<dma16>,<sb_io>,<sb_irq>,<sb_dma>,<sb_dma16>
| |
|
| |
| pas16= [HW,SCSI]
| |
| See header of drivers/scsi/pas16.c.
| |
|
| |
| pause_on_oops=
| |
| Halt all CPUs after the first oops has been printed for
| |
| the specified number of seconds. This is to be used if
| |
| your oopses keep scrolling off the screen.
| |
|
| |
| pcbit= [HW,ISDN]
| |
|
| |
| pcd. [PARIDE]
| |
| See header of drivers/block/paride/pcd.c.
| |
| See also Documentation/blockdev/paride.txt.
| |
|
| |
| pci=option[,option...] [PCI] various PCI subsystem options:
| |
| off [X86] don't probe for the PCI bus
| |
| bios [X86-32] force use of PCI BIOS, don't access
| |
| the hardware directly. Use this if your machine
| |
| has a non-standard PCI host bridge.
| |
| nobios [X86-32] disallow use of PCI BIOS, only direct
| |
| hardware access methods are allowed. Use this
| |
| if you experience crashes upon bootup and you
| |
| suspect they are caused by the BIOS.
| |
| conf1 [X86] Force use of PCI Configuration
| |
| Mechanism 1.
| |
| conf2 [X86] Force use of PCI Configuration
| |
| Mechanism 2.
| |
| noaer [PCIE] If the PCIEAER kernel config parameter is
| |
| enabled, this kernel boot option can be used to
| |
| disable the use of PCIE advanced error reporting.
| |
| nodomains [PCI] Disable support for multiple PCI
| |
| root domains (aka PCI segments, in ACPI-speak).
| |
| nommconf [X86-32,X86_64] Disable use of MMCONFIG for PCI
| |
| Configuration
| |
| msi [MSI] If the PCI_MSI kernel config parameter is
| |
| enabled, this kernel boot option can be used to
| |
| enable the use of MSI interrupts system-wide.
| |
| nomsi [MSI] If the PCI_MSI kernel config parameter is
| |
| enabled, this kernel boot option can be used to
| |
| disable the use of MSI interrupts system-wide.
| |
| noioapicquirk [APIC] Disable all boot interrupt quirks.
| |
| Safety option to keep boot IRQs enabled. This
| |
| should never be necessary.
| |
| ioapicreroute [APIC] Enable rerouting of boot IRQs to the
| |
| primary IO-APIC for bridges that cannot disable
| |
| boot IRQs. This fixes a source of spurious IRQs
| |
| when the system masks IRQs.
| |
| noioapicreroute [APIC] Disable workaround that uses the
| |
| boot IRQ equivalent of an IRQ that connects to
| |
| a chipset where boot IRQs cannot be disabled.
| |
| The opposite of ioapicreroute.
| |
| biosirq [X86-32] Use PCI BIOS calls to get the interrupt
| |
| routing table. These calls are known to be buggy
| |
| on several machines and they hang the machine
| |
| when used, but on other computers it's the only
| |
| way to get the interrupt routing table. Try
| |
| this option if the kernel is unable to allocate
| |
| IRQs or discover secondary PCI buses on your
| |
| motherboard.
| |
| rom [X86] Assign address space to expansion ROMs.
| |
| Use with caution as certain devices share
| |
| address decoders between ROMs and other
| |
| resources.
| |
| norom [X86] Do not assign address space to
| |
| expansion ROMs that do not already have
| |
| BIOS assigned address ranges.
| |
| irqmask=0xMMMM [X86] Set a bit mask of IRQs allowed to be
| |
| assigned automatically to PCI devices. You can
| |
| make the kernel exclude IRQs of your ISA cards
| |
| this way.
| |
| pirqaddr=0xAAAAA [X86] Specify the physical address
| |
| of the PIRQ table (normally generated
| |
| by the BIOS) if it is outside the
| |
| F0000h-100000h range.
| |
| lastbus=N [X86] Scan all buses thru bus #N. Can be
| |
| useful if the kernel is unable to find your
| |
| secondary buses and you want to tell it
| |
| explicitly which ones they are.
| |
| assign-busses [X86] Always assign all PCI bus
| |
| numbers ourselves, overriding
| |
| whatever the firmware may have done.
| |
| usepirqmask [X86] Honor the possible IRQ mask stored
| |
| in the BIOS $PIR table. This is needed on
| |
| some systems with broken BIOSes, notably
| |
| some HP Pavilion N5400 and Omnibook XE3
| |
| notebooks. This will have no effect if ACPI
| |
| IRQ routing is enabled.
| |
| noacpi [X86] Do not use ACPI for IRQ routing
| |
| or for PCI scanning.
| |
| use_crs [X86] Use _CRS for PCI resource
| |
| allocation.
| |
| routeirq Do IRQ routing for all PCI devices.
| |
| This is normally done in pci_enable_device(),
| |
| so this option is a temporary workaround
| |
| for broken drivers that don't call it.
| |
| skip_isa_align [X86] do not align io start addr, so can
| |
| handle more pci cards
| |
| firmware [ARM] Do not re-enumerate the bus but instead
| |
| just use the configuration from the
| |
| bootloader. This is currently used on
| |
| IXP2000 systems where the bus has to be
| |
| configured a certain way for adjunct CPUs.
| |
| noearly [X86] Don't do any early type 1 scanning.
| |
| This might help on some broken boards which
| |
| machine check when some devices' config space
| |
| is read. But various workarounds are disabled
| |
| and some IOMMU drivers will not work.
| |
| bfsort Sort PCI devices into breadth-first order.
| |
| This sorting is done to get a device
| |
| order compatible with older (<= 2.4) kernels.
| |
| nobfsort Don't sort PCI devices into breadth-first order.
| |
| cbiosize=nn[KMG] The fixed amount of bus space which is
| |
| reserved for the CardBus bridge's IO window.
| |
| The default value is 256 bytes.
| |
| cbmemsize=nn[KMG] The fixed amount of bus space which is
| |
| reserved for the CardBus bridge's memory
| |
| window. The default value is 64 megabytes.
| |
|
| |
| pcie_aspm= [PCIE] Forcibly enable or disable PCIe Active State Power
| |
| Management.
| |
| off Disable ASPM.
| |
| force Enable ASPM even on devices that claim not to support it.
| |
| WARNING: Forcing ASPM on may cause system lockups.
| |
|
| |
| pcmv= [HW,PCMCIA] BadgePAD 4
| |
|
| |
| pd. [PARIDE]
| |
| See Documentation/blockdev/paride.txt.
| |
|
| |
| pdcchassis= [PARISC,HW] Disable/Enable PDC Chassis Status codes at
| |
| boot time.
| |
| Format: { 0 | 1 }
| |
| See arch/parisc/kernel/pdc_chassis.c
| |
|
| |
| pf. [PARIDE]
| |
| See Documentation/blockdev/paride.txt.
| |
|
| |
| pg. [PARIDE]
| |
| See Documentation/blockdev/paride.txt.
| |
|
| |
| pirq= [SMP,APIC] Manual mp-table setup
| |
| See Documentation/x86/i386/IO-APIC.txt.
| |
|
| |
| plip= [PPT,NET] Parallel port network link
| |
| Format: { parport<nr> | timid | 0 }
| |
| See also Documentation/parport.txt.
| |
|
| |
| pmtmr= [X86] Manual setup of pmtmr I/O Port.
| |
| Override pmtimer IOPort with a hex value.
| |
| e.g. pmtmr=0x508
| |
|
| |
| pnp.debug [PNP]
| |
| Enable PNP debug messages. This depends on the
| |
| CONFIG_PNP_DEBUG_MESSAGES option.
| |
|
| |
| pnpacpi= [ACPI]
| |
| { off }
| |
|
| |
| pnpbios= [ISAPNP]
| |
| { on | off | curr | res | no-curr | no-res }
| |
|
| |
| pnp_reserve_irq=
| |
| [ISAPNP] Exclude IRQs for the autoconfiguration
| |
|
| |
| pnp_reserve_dma=
| |
| [ISAPNP] Exclude DMAs for the autoconfiguration
| |
|
| |
| pnp_reserve_io= [ISAPNP] Exclude I/O ports for the autoconfiguration
| |
| Ranges are in pairs (I/O port base and size).
| |
|
| |
| pnp_reserve_mem=
| |
| [ISAPNP] Exclude memory regions for the
| |
| autoconfiguration.
| |
| Ranges are in pairs (memory base and size).
| |
|
| |
| dynamic_printk Enables pr_debug()/dev_dbg() calls if
| |
| CONFIG_DYNAMIC_PRINTK_DEBUG has been enabled.
| |
| These can also be switched on/off via
| |
| <debugfs>/dynamic_printk/modules
| |
|
| |
| print-fatal-signals=
| |
| [KNL] debug: print fatal signals
| |
| print-fatal-signals=1: print segfault info to
| |
| the kernel console.
| |
| default: off.
| |
|
| |
| printk.time= Show timing data prefixed to each printk message line
| |
| Format: <bool> (1/Y/y=enable, 0/N/n=disable)
| |
|
| |
| profile= [KNL] Enable kernel profiling via /proc/profile
| |
| Format: [schedule,]<number>
| |
| Param: "schedule" - profile schedule points.
| |
| Param: <number> - step/bucket size as a power of 2 for
| |
| statistical time based profiling.
| |
| Param: "sleep" - profile D-state sleeping (millisecs).
| |
| Requires CONFIG_SCHEDSTATS
| |
| Param: "kvm" - profile VM exits.
| |
|
| |
| processor.max_cstate= [HW,ACPI]
| |
| Limit processor to maximum C-state
| |
| max_cstate=9 overrides any DMI blacklist limit.
| |
|
| |
| processor.nocst [HW,ACPI]
| |
| Ignore the _CST method to determine C-states,
| |
| instead using the legacy FADT method
| |
|
| |
| prompt_ramdisk= [RAM] List of RAM disks to prompt for floppy disk
| |
| before loading.
| |
| See Documentation/blockdev/ramdisk.txt.
| |
|
| |
| psmouse.proto= [HW,MOUSE] Highest PS2 mouse protocol extension to
| |
| probe for; one of (bare|imps|exps|lifebook|any).
| |
| psmouse.rate= [HW,MOUSE] Set desired mouse report rate, in reports
| |
| per second.
| |
| psmouse.resetafter= [HW,MOUSE]
| |
| Try to reset the device after so many bad packets
| |
| (0 = never).
| |
| psmouse.resolution=
| |
| [HW,MOUSE] Set desired mouse resolution, in dpi.
| |
| psmouse.smartscroll=
| |
| [HW,MOUSE] Controls Logitech smartscroll autorepeat.
| |
| 0 = disabled, 1 = enabled (default).
| |
|
| |
| pss= [HW,OSS] Personal Sound System (ECHO ESC614)
| |
| Format:
| |
| <io>,<mss_io>,<mss_irq>,<mss_dma>,<mpu_io>,<mpu_irq>
| |
|
| |
| pt. [PARIDE]
| |
| See Documentation/blockdev/paride.txt.
| |
|
| |
| pty.legacy_count=
| |
| [KNL] Number of legacy pty's. Overwrites compiled-in
| |
| default number.
| |
|
| |
| quiet [KNL] Disable most log messages
| |
|
| |
| r128= [HW,DRM]
| |
|
| |
| raid= [HW,RAID]
| |
| See Documentation/md.txt.
| |
|
| |
| ramdisk_blocksize= [RAM]
| |
| See Documentation/blockdev/ramdisk.txt.
| |
|
| |
| ramdisk_size= [RAM] Sizes of RAM disks in kilobytes
| |
| See Documentation/blockdev/ramdisk.txt.
| |
|
| |
| rcupdate.blimit= [KNL,BOOT]
| |
| Set maximum number of finished RCU callbacks to process
| |
| in one batch.
| |
|
| |
| rcupdate.qhimark= [KNL,BOOT]
| |
| Set threshold of queued
| |
| RCU callbacks over which batch limiting is disabled.
| |
|
| |
| rcupdate.qlowmark= [KNL,BOOT]
| |
| Set threshold of queued RCU callbacks below which
| |
| batch limiting is re-enabled.
| |
|
| |
| rdinit= [KNL]
| |
| Format: <full_path>
| |
| Run specified binary instead of /init from the ramdisk,
| |
| used for early userspace startup. See initrd.
| |
|
| |
| reboot= [BUGS=X86-32,BUGS=ARM,BUGS=IA-64] Rebooting mode
| |
| Format: <reboot_mode>[,<reboot_mode2>[,...]]
| |
| See arch/*/kernel/reboot.c or arch/*/kernel/process.c
| |
|
| |
| relax_domain_level=
| |
| [KNL, SMP] Set scheduler's default relax_domain_level.
| |
| See Documentation/cpusets.txt.
| |
|
| |
| reserve= [KNL,BUGS] Force the kernel to ignore some iomem area
| |
|
| |
| reservetop= [X86-32]
| |
| Format: nn[KMG]
| |
| Reserves a hole at the top of the kernel virtual
| |
| address space.
| |
|
| |
| reset_devices [KNL] Force drivers to reset the underlying device
| |
| during initialization.
| |
|
| |
| resume= [SWSUSP]
| |
| Specify the partition device for software suspend
| |
|
| |
| resume_offset= [SWSUSP]
| |
| Specify the offset from the beginning of the partition
| |
| given by "resume=" at which the swap header is located,
| |
| in <PAGE_SIZE> units (needed only for swap files).
| |
| See Documentation/power/swsusp-and-swap-files.txt
| |
|
| |
| retain_initrd [RAM] Keep initrd memory after extraction
| |
|
| |
| rhash_entries= [KNL,NET]
| |
| Set number of hash buckets for route cache
| |
|
| |
| riscom8= [HW,SERIAL]
| |
| Format: <io_board1>[,<io_board2>[,...<io_boardN>]]
| |
|
| |
| ro [KNL] Mount root device read-only on boot
| |
|
| |
| root= [KNL] Root filesystem
| |
|
| |
| rootdelay= [KNL] Delay (in seconds) to pause before attempting to
| |
| mount the root filesystem
| |
|
| |
| rootflags= [KNL] Set root filesystem mount option string
| |
|
| |
| rootfstype= [KNL] Set root filesystem type
| |
|
| |
| rootwait [KNL] Wait (indefinitely) for root device to show up.
| |
| Useful for devices that are detected asynchronously
| |
| (e.g. USB and MMC devices).
| |
|
| |
| root_plug.vendor_id=
| |
| [ROOTPLUG] Override the default vendor ID
| |
|
| |
| root_plug.product_id=
| |
| [ROOTPLUG] Override the default product ID
| |
|
| |
| root_plug.debug=
| |
| [ROOTPLUG] Enable debugging output
| |
|
| |
| rw [KNL] Mount root device read-write on boot
| |
|
| |
| S [KNL] Run init in single mode
| |
|
| |
| sa1100ir [NET]
| |
| See drivers/net/irda/sa1100_ir.c.
| |
|
| |
| sbni= [NET] Granch SBNI12 leased line adapter
| |
|
| |
| sc1200wdt= [HW,WDT] SC1200 WDT (watchdog) driver
| |
| Format: <io>[,<timeout>[,<isapnp>]]
| |
|
| |
| scsi_debug_*= [SCSI]
| |
| See drivers/scsi/scsi_debug.c.
| |
|
| |
| scsi_default_dev_flags=
| |
| [SCSI] SCSI default device flags
| |
| Format: <integer>
| |
|
| |
| scsi_dev_flags= [SCSI] Black/white list entry for vendor and model
| |
| Format: <vendor>:<model>:<flags>
| |
| (flags are integer value)
| |
|
| |
| scsi_logging_level= [SCSI] a bit mask of logging levels
| |
| See drivers/scsi/scsi_logging.h for bits. Also
| |
| settable via sysctl at dev.scsi.logging_level
| |
| (/proc/sys/dev/scsi/logging_level).
| |
| There is also a nice 'scsi_logging_level' script in the
| |
| S390-tools package, available for download at
| |
| http://www-128.ibm.com/developerworks/linux/linux390/s390-tools-1.5.4.html
| |
|
| |
| scsi_mod.scan= [SCSI] sync (default) scans SCSI busses as they are
| |
| discovered. async scans them in kernel threads,
| |
| allowing boot to proceed. none ignores them, expecting
| |
| user space to do the scan.
| |
|
| |
| selinux [SELINUX] Disable or enable SELinux at boot time.
| |
| Format: { "0" | "1" }
| |
| See security/selinux/Kconfig help text.
| |
| 0 -- disable.
| |
| 1 -- enable.
| |
| Default value is set via kernel config option.
| |
| If enabled at boot time, /selinux/disable can be used
| |
| later to disable prior to initial policy load.
| |
|
| |
| selinux_compat_net =
| |
| [SELINUX] Set initial selinux_compat_net flag value.
| |
| Format: { "0" | "1" }
| |
| 0 -- use new secmark-based packet controls
| |
| 1 -- use legacy packet controls
| |
| Default value is 0 (preferred).
| |
| Value can be changed at runtime via
| |
| /selinux/compat_net.
| |
|
| |
| serialnumber [BUGS=X86-32]
| |
|
| |
| shapers= [NET]
| |
| Maximal number of shapers.
| |
|
| |
| show_msr= [x86] show boot-time MSR settings
| |
| Format: { <integer> }
| |
| Show boot-time (BIOS-initialized) MSR settings.
| |
| The parameter means the number of CPUs to show,
| |
| for example 1 means boot CPU only.
| |
|
| |
| sim710= [SCSI,HW]
| |
| See header of drivers/scsi/sim710.c.
| |
|
| |
| simeth= [IA-64]
| |
| simscsi=
| |
|
| |
| slram= [HW,MTD]
| |
|
| |
| slub_debug[=options[,slabs]] [MM, SLUB]
| |
| Enabling slub_debug allows one to determine the
| |
| culprit if slab objects become corrupted. Enabling
| |
| slub_debug can create guard zones around objects and
| |
| may poison objects when not in use. Also tracks the
| |
| last alloc / free. For more information see
| |
| Documentation/vm/slub.txt.
| |
|
| |
| slub_max_order= [MM, SLUB]
| |
| Determines the maximum allowed order for slabs.
| |
| A high setting may cause OOMs due to memory
| |
| fragmentation. For more information see
| |
| Documentation/vm/slub.txt.
| |
|
| |
| slub_min_objects= [MM, SLUB]
| |
| The minimum number of objects per slab. SLUB will
| |
| increase the slab order up to slub_max_order to
| |
| generate a sufficiently large slab able to contain
| |
| the number of objects indicated. The higher the number
| |
| of objects the smaller the overhead of tracking slabs
| |
| and the less frequently locks need to be acquired.
| |
| For more information see Documentation/vm/slub.txt.
| |
|
| |
| slub_min_order= [MM, SLUB]
| |
| Determines the mininum page order for slabs. Must be
| |
| lower than slub_max_order.
| |
| For more information see Documentation/vm/slub.txt.
| |
|
| |
| slub_nomerge [MM, SLUB]
| |
| Disable merging of slabs with similar size. May be
| |
| necessary if there is some reason to distinguish
| |
| allocs to different slabs. Debug options disable
| |
| merging on their own.
| |
| For more information see Documentation/vm/slub.txt.
| |
|
| |
| smart2= [HW]
| |
| Format: <io1>[,<io2>[,...,<io8>]]
| |
|
| |
| smp-alt-once [X86-32,SMP] On a hotplug CPU system, only
| |
| attempt to substitute SMP alternatives once at boot.
| |
|
| |
| smsc-ircc2.nopnp [HW] Don't use PNP to discover SMC devices
| |
| smsc-ircc2.ircc_cfg= [HW] Device configuration I/O port
| |
| smsc-ircc2.ircc_sir= [HW] SIR base I/O port
| |
| smsc-ircc2.ircc_fir= [HW] FIR base I/O port
| |
| smsc-ircc2.ircc_irq= [HW] IRQ line
| |
| smsc-ircc2.ircc_dma= [HW] DMA channel
| |
| smsc-ircc2.ircc_transceiver= [HW] Transceiver type:
| |
| 0: Toshiba Satellite 1800 (GP data pin select)
| |
| 1: Fast pin select (default)
| |
| 2: ATC IRMode
| |
|
| |
| snd-ad1816a= [HW,ALSA]
| |
|
| |
| snd-ad1848= [HW,ALSA]
| |
|
| |
| snd-ali5451= [HW,ALSA]
| |
|
| |
| snd-als100= [HW,ALSA]
| |
|
| |
| snd-als4000= [HW,ALSA]
| |
|
| |
| snd-azt2320= [HW,ALSA]
| |
|
| |
| snd-cmi8330= [HW,ALSA]
| |
|
| |
| snd-cmipci= [HW,ALSA]
| |
|
| |
| snd-cs4231= [HW,ALSA]
| |
|
| |
| snd-cs4232= [HW,ALSA]
| |
|
| |
| snd-cs4236= [HW,ALSA]
| |
|
| |
| snd-cs4281= [HW,ALSA]
| |
|
| |
| snd-cs46xx= [HW,ALSA]
| |
|
| |
| snd-dt019x= [HW,ALSA]
| |
|
| |
| snd-dummy= [HW,ALSA]
| |
|
| |
| snd-emu10k1= [HW,ALSA]
| |
|
| |
| snd-ens1370= [HW,ALSA]
| |
|
| |
| snd-ens1371= [HW,ALSA]
| |
|
| |
| snd-es968= [HW,ALSA]
| |
|
| |
| snd-es1688= [HW,ALSA]
| |
|
| |
| snd-es18xx= [HW,ALSA]
| |
|
| |
| snd-es1938= [HW,ALSA]
| |
|
| |
| snd-es1968= [HW,ALSA]
| |
|
| |
| snd-fm801= [HW,ALSA]
| |
|
| |
| snd-gusclassic= [HW,ALSA]
| |
|
| |
| snd-gusextreme= [HW,ALSA]
| |
|
| |
| snd-gusmax= [HW,ALSA]
| |
|
| |
| snd-hdsp= [HW,ALSA]
| |
|
| |
| snd-ice1712= [HW,ALSA]
| |
|
| |
| snd-intel8x0= [HW,ALSA]
| |
|
| |
| snd-interwave= [HW,ALSA]
| |
|
| |
| snd-interwave-stb=
| |
| [HW,ALSA]
| |
|
| |
| snd-korg1212= [HW,ALSA]
| |
|
| |
| snd-maestro3= [HW,ALSA]
| |
|
| |
| snd-mpu401= [HW,ALSA]
| |
|
| |
| snd-mtpav= [HW,ALSA]
| |
|
| |
| snd-nm256= [HW,ALSA]
| |
|
| |
| snd-opl3sa2= [HW,ALSA]
| |
|
| |
| snd-opti92x-ad1848=
| |
| [HW,ALSA]
| |
|
| |
| snd-opti92x-cs4231=
| |
| [HW,ALSA]
| |
|
| |
| snd-opti93x= [HW,ALSA]
| |
|
| |
| snd-pmac= [HW,ALSA]
| |
|
| |
| snd-rme32= [HW,ALSA]
| |
|
| |
| snd-rme96= [HW,ALSA]
| |
|
| |
| snd-rme9652= [HW,ALSA]
| |
|
| |
| snd-sb8= [HW,ALSA]
| |
|
| |
| snd-sb16= [HW,ALSA]
| |
|
| |
| snd-sbawe= [HW,ALSA]
| |
|
| |
| snd-serial= [HW,ALSA]
| |
|
| |
| snd-sgalaxy= [HW,ALSA]
| |
|
| |
| snd-sonicvibes= [HW,ALSA]
| |
|
| |
| snd-sun-amd7930=
| |
| [HW,ALSA]
| |
|
| |
| snd-sun-cs4231= [HW,ALSA]
| |
|
| |
| snd-trident= [HW,ALSA]
| |
|
| |
| snd-usb-audio= [HW,ALSA,USB]
| |
|
| |
| snd-via82xx= [HW,ALSA]
| |
|
| |
| snd-virmidi= [HW,ALSA]
| |
|
| |
| snd-wavefront= [HW,ALSA]
| |
|
| |
| snd-ymfpci= [HW,ALSA]
| |
|
| |
| softlockup_panic=
| |
| [KNL] Should the soft-lockup detector generate panics.
| |
|
| |
| sonypi.*= [HW] Sony Programmable I/O Control Device driver
| |
| See Documentation/sonypi.txt
| |
|
| |
| specialix= [HW,SERIAL] Specialix multi-serial port adapter
| |
| See Documentation/serial/specialix.txt.
| |
|
| |
| spia_io_base= [HW,MTD]
| |
| spia_fio_base=
| |
| spia_pedr=
| |
| spia_peddr=
| |
|
| |
| sscape= [HW,OSS]
| |
| Format: <io>,<irq>,<dma>,<mpu_io>,<mpu_irq>
| |
|
| |
| st= [HW,SCSI] SCSI tape parameters (buffers, etc.)
| |
| See Documentation/scsi/st.txt.
| |
|
| |
| stacktrace [FTRACE]
| |
| Enabled the stack tracer on boot up.
| |
|
| |
| sti= [PARISC,HW]
| |
| Format: <num>
| |
| Set the STI (builtin display/keyboard on the HP-PARISC
| |
| machines) console (graphic card) which should be used
| |
| as the initial boot-console.
| |
| See also comment in drivers/video/console/sticore.c.
| |
|
| |
| sti_font= [HW]
| |
| See comment in drivers/video/console/sticore.c.
| |
|
| |
| stifb= [HW]
| |
| Format: bpp:<bpp1>[:<bpp2>[:<bpp3>...]]
| |
|
| |
| sunrpc.pool_mode=
| |
| [NFS]
| |
| Control how the NFS server code allocates CPUs to
| |
| service thread pools. Depending on how many NICs
| |
| you have and where their interrupts are bound, this
| |
| option will affect which CPUs will do NFS serving.
| |
| Note: this parameter cannot be changed while the
| |
| NFS server is running.
| |
|
| |
| auto the server chooses an appropriate mode
| |
| automatically using heuristics
| |
| global a single global pool contains all CPUs
| |
| percpu one pool for each CPU
| |
| pernode one pool for each NUMA node (equivalent
| |
| to global on non-NUMA machines)
| |
|
| |
| swiotlb= [IA-64] Number of I/O TLB slabs
| |
|
| |
| switches= [HW,M68k]
| |
|
| |
| sym53c416= [HW,SCSI]
| |
| See header of drivers/scsi/sym53c416.c.
| |
|
| |
| sysrq_always_enabled
| |
| [KNL]
| |
| Ignore sysrq setting - this boot parameter will
| |
| neutralize any effect of /proc/sys/kernel/sysrq.
| |
| Useful for debugging.
| |
|
| |
| t128= [HW,SCSI]
| |
| See header of drivers/scsi/t128.c.
| |
|
| |
| tdfx= [HW,DRM]
| |
|
| |
| test_suspend= [SUSPEND]
| |
| Specify "mem" (for Suspend-to-RAM) or "standby" (for
| |
| standby suspend) as the system sleep state to briefly
| |
| enter during system startup. The system is woken from
| |
| this state using a wakeup-capable RTC alarm.
| |
|
| |
| thash_entries= [KNL,NET]
| |
| Set number of hash buckets for TCP connection
| |
|
| |
| thermal.act= [HW,ACPI]
| |
| -1: disable all active trip points in all thermal zones
| |
| <degrees C>: override all lowest active trip points
| |
|
| |
| thermal.crt= [HW,ACPI]
| |
| -1: disable all critical trip points in all thermal zones
| |
| <degrees C>: override all critical trip points
| |
|
| |
| thermal.nocrt= [HW,ACPI]
| |
| Set to disable actions on ACPI thermal zone
| |
| critical and hot trip points.
| |
|
| |
| thermal.off= [HW,ACPI]
| |
| 1: disable ACPI thermal control
| |
|
| |
| thermal.psv= [HW,ACPI]
| |
| -1: disable all passive trip points
| |
| <degrees C>: override all passive trip points to this
| |
| value
| |
|
| |
| thermal.tzp= [HW,ACPI]
| |
| Specify global default ACPI thermal zone polling rate
| |
| <deci-seconds>: poll all this frequency
| |
| 0: no polling (default)
| |
|
| |
| tmscsim= [HW,SCSI]
| |
| See comment before function dc390_setup() in
| |
| drivers/scsi/tmscsim.c.
| |
|
| |
| topology= [S390]
| |
| Format: {off | on}
| |
| Specify if the kernel should make use of the cpu
| |
| topology informations if the hardware supports these.
| |
| The scheduler will make use of these informations and
| |
| e.g. base its process migration decisions on it.
| |
| Default is off.
| |
|
| |
| tp720= [HW,PS2]
| |
|
| |
| trix= [HW,OSS] MediaTrix AudioTrix Pro
| |
| Format:
| |
| <io>,<irq>,<dma>,<dma2>,<sb_io>,<sb_irq>,<sb_dma>,<mpu_io>,<mpu_irq>
| |
|
| |
| tsc= Disable clocksource-must-verify flag for TSC.
| |
| Format: <string>
| |
| [x86] reliable: mark tsc clocksource as reliable, this
| |
| disables clocksource verification at runtime.
| |
| Used to enable high-resolution timer mode on older
| |
| hardware, and in virtualized environment.
| |
|
| |
| turbografx.map[2|3]= [HW,JOY]
| |
| TurboGraFX parallel port interface
| |
| Format:
| |
| <port#>,<js1>,<js2>,<js3>,<js4>,<js5>,<js6>,<js7>
| |
| See also Documentation/input/joystick-parport.txt
| |
|
| |
| u14-34f= [HW,SCSI] UltraStor 14F/34F SCSI host adapter
| |
| See header of drivers/scsi/u14-34f.c.
| |
|
| |
| uart401= [HW,OSS]
| |
| Format: <io>,<irq>
| |
|
| |
| uart6850= [HW,OSS]
| |
| Format: <io>,<irq>
| |
|
| |
| uhci-hcd.ignore_oc=
| |
| [USB] Ignore overcurrent events (default N).
| |
| Some badly-designed motherboards generate lots of
| |
| bogus events, for ports that aren't wired to
| |
| anything. Set this parameter to avoid log spamming.
| |
| Note that genuine overcurrent events won't be
| |
| reported either.
| |
|
| |
| unknown_nmi_panic
| |
| [X86-32,X86-64]
| |
| Set unknown_nmi_panic=1 early on boot.
| |
|
| |
| usbcore.autosuspend=
| |
| [USB] The autosuspend time delay (in seconds) used
| |
| for newly-detected USB devices (default 2). This
| |
| is the time required before an idle device will be
| |
| autosuspended. Devices for which the delay is set
| |
| to a negative value won't be autosuspended at all.
| |
|
| |
| usbcore.usbfs_snoop=
| |
| [USB] Set to log all usbfs traffic (default 0 = off).
| |
|
| |
| usbcore.blinkenlights=
| |
| [USB] Set to cycle leds on hubs (default 0 = off).
| |
|
| |
| usbcore.old_scheme_first=
| |
| [USB] Start with the old device initialization
| |
| scheme (default 0 = off).
| |
|
| |
| usbcore.use_both_schemes=
| |
| [USB] Try the other device initialization scheme
| |
| if the first one fails (default 1 = enabled).
| |
|
| |
| usbcore.initial_descriptor_timeout=
| |
| [USB] Specifies timeout for the initial 64-byte
| |
| USB_REQ_GET_DESCRIPTOR request in milliseconds
| |
| (default 5000 = 5.0 seconds).
| |
|
| |
| usbhid.mousepoll=
| |
| [USBHID] The interval which mice are to be polled at.
| |
|
| |
| usb-storage.delay_use=
| |
| [UMS] The delay in seconds before a new device is
| |
| scanned for Logical Units (default 5).
| |
|
| |
| usb-storage.quirks=
| |
| [UMS] A list of quirks entries to supplement or
| |
| override the built-in unusual_devs list. List
| |
| entries are separated by commas. Each entry has
| |
| the form VID:PID:Flags where VID and PID are Vendor
| |
| and Product ID values (4-digit hex numbers) and
| |
| Flags is a set of characters, each corresponding
| |
| to a common usb-storage quirk flag as follows:
| |
| a = SANE_SENSE (collect more than 18 bytes
| |
| of sense data);
| |
| c = FIX_CAPACITY (decrease the reported
| |
| device capacity by one sector);
| |
| h = CAPACITY_HEURISTICS (decrease the
| |
| reported device capacity by one
| |
| sector if the number is odd);
| |
| i = IGNORE_DEVICE (don't bind to this
| |
| device);
| |
| l = NOT_LOCKABLE (don't try to lock and
| |
| unlock ejectable media);
| |
| m = MAX_SECTORS_64 (don't transfer more
| |
| than 64 sectors = 32 KB at a time);
| |
| o = CAPACITY_OK (accept the capacity
| |
| reported by the device);
| |
| r = IGNORE_RESIDUE (the device reports
| |
| bogus residue values);
| |
| s = SINGLE_LUN (the device has only one
| |
| Logical Unit);
| |
| w = NO_WP_DETECT (don't test whether the
| |
| medium is write-protected).
| |
| Example: quirks=0419:aaf5:rl,0421:0433:rc
| |
|
| |
| add_efi_memmap [EFI; x86-32,X86-64] Include EFI memory map in
| |
| kernel's map of available physical RAM.
| |
|
| |
| vdso= [X86-32,SH,x86-64]
| |
| vdso=2: enable compat VDSO (default with COMPAT_VDSO)
| |
| vdso=1: enable VDSO (default)
| |
| vdso=0: disable VDSO mapping
| |
|
| |
| vdso32= [X86-32,X86-64]
| |
| vdso32=2: enable compat VDSO (default with COMPAT_VDSO)
| |
| vdso32=1: enable 32-bit VDSO (default)
| |
| vdso32=0: disable 32-bit VDSO mapping
| |
|
| |
| vector= [IA-64,SMP]
| |
| vector=percpu: enable percpu vector domain
| |
|
| |
| video= [FB] Frame buffer configuration
| |
| See Documentation/fb/modedb.txt.
| |
|
| |
| vga= [BOOT,X86-32] Select a particular video mode
| |
| See Documentation/x86/boot.txt and
| |
| Documentation/svga.txt.
| |
| Use vga=ask for menu.
| |
| This is actually a boot loader parameter; the value is
| |
| passed to the kernel using a special protocol.
| |
|
| |
| vmalloc=nn[KMG] [KNL,BOOT] Forces the vmalloc area to have an exact
| |
| size of <nn>. This can be used to increase the
| |
| minimum size (128MB on x86). It can also be used to
| |
| decrease the size and leave more room for directly
| |
| mapped kernel RAM.
| |
|
| |
| vmhalt= [KNL,S390] Perform z/VM CP command after system halt.
| |
| Format: <command>
| |
|
| |
| vmpanic= [KNL,S390] Perform z/VM CP command after kernel panic.
| |
| Format: <command>
| |
|
| |
| vmpoff= [KNL,S390] Perform z/VM CP command after power off.
| |
| Format: <command>
| |
|
| |
| waveartist= [HW,OSS]
| |
| Format: <io>,<irq>,<dma>,<dma2>
| |
|
| |
| wd33c93= [HW,SCSI]
| |
| See header of drivers/scsi/wd33c93.c.
| |
|
| |
| wd7000= [HW,SCSI]
| |
| See header of drivers/scsi/wd7000.c.
| |
|
| |
| wdt= [WDT] Watchdog
| |
| See Documentation/watchdog/wdt.txt.
| |
|
| |
| xd= [HW,XT] Original XT pre-IDE (RLL encoded) disks.
| |
| xd_geo= See header of drivers/block/xd.c.
| |
|
| |
| xirc2ps_cs= [NET,PCMCIA]
| |
| Format:
| |
| <irq>,<irq_mask>,<io>,<full_duplex>,<do_sound>,<lockup_hack>[,<irq2>[,<irq3>[,<irq4>]]]
| |
|
| |
| norandmaps Don't use address space randomization. Equivalent to
| |
| echo 0 > /proc/sys/kernel/randomize_va_space
| |
|
| |
| ______________________________________________________________________
| |
|
| |
| TODO:
| |
|
| |
| Add documentation for ALSA options.
| |
| Add more DRM drivers.
| |
