vserver 1.9.5.x5

[linux-2.6.git] / Documentation / kernel-parameters.txt

diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index e7ea0b7..b24c796 100644 (file)
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -29,6 +29,7 @@ restrictions referred to are that the relevant option is valid if:
        CD      Appropriate CD support is enabled.
        DEVFS   devfs support is enabled. 
        DRM     Direct Rendering Management support is enabled. 
        CD      Appropriate CD support is enabled.
        DEVFS   devfs support is enabled. 
        DRM     Direct Rendering Management support is enabled. 

+       EDD     BIOS Enhanced Disk Drive Services (EDD) is enabled

        EFI     EFI Partitioning (GPT) is enabled
        EIDE    EIDE/ATAPI support is enabled.
        FB      The frame buffer device is enabled.
        EFI     EFI Partitioning (GPT) is enabled
        EIDE    EIDE/ATAPI support is enabled.
        FB      The frame buffer device is enabled.


@@ -50,9 +51,11 @@ restrictions referred to are that the relevant option is valid if:
        MOUSE   Appropriate mouse support is enabled.
        MTD     MTD support is enabled.
        NET     Appropriate network support is enabled.
        MOUSE   Appropriate mouse support is enabled.
        MTD     MTD support is enabled.
        NET     Appropriate network support is enabled.

+       NUMA    NUMA support is enabled.

        NFS     Appropriate NFS support is enabled.
        OSS     OSS sound support is enabled.
        PARIDE  The ParIDE subsystem is enabled.
        NFS     Appropriate NFS support is enabled.
        OSS     OSS sound support is enabled.
        PARIDE  The ParIDE subsystem is enabled.

+       PARISC  The PA-RISC architecture is enabled.

        PCI     PCI bus support is enabled.
        PCMCIA  The PCMCIA subsystem is enabled.
        PNP     Plug & Play support is enabled.
        PCI     PCI bus support is enabled.
        PCMCIA  The PCMCIA subsystem is enabled.
        PNP     Plug & Play support is enabled.


@@ -149,6 +152,8 @@ running once the system is up.
                        debugging. After system has booted up, it can be set
                        via /proc/acpi/debug_level.
 
                        debugging. After system has booted up, it can be set
                        via /proc/acpi/debug_level.
 

+       acpi_fake_ecdt  [HW,ACPI] Workaround failure due to BIOS lacking ECDT
+

        ad1816=         [HW,OSS]
                        Format: <io>,<irq>,<dma>,<dma2>
                        See also Documentation/sound/oss/AD1816.
        ad1816=         [HW,OSS]
                        Format: <io>,<irq>,<dma>,<dma2>
                        See also Documentation/sound/oss/AD1816.


@@ -221,15 +226,19 @@ running once the system is up.
 
        atascsi=        [HW,SCSI] Atari SCSI
 
 
        atascsi=        [HW,SCSI] Atari SCSI
 

-       atkbd.extra=    [HW] Enable extra LEDs and keys on IBM RapidAccess, EzKey
-                       and similar keyboards
+       atkbd.extra=    [HW] Enable extra LEDs and keys on IBM RapidAccess,
+                       EzKey and similar keyboards

 
        atkbd.reset=    [HW] Reset keyboard during initialization
 
        atkbd.set=      [HW] Select keyboard code set 
                        Format: <int> (2 = AT (default) 3 = PS/2)
 
 
        atkbd.reset=    [HW] Reset keyboard during initialization
 
        atkbd.set=      [HW] Select keyboard code set 
                        Format: <int> (2 = AT (default) 3 = PS/2)
 

-       atkbd.scroll=   [HW] Enable scroll wheel on MS Office and similar keyboards
+       atkbd.scroll=   [HW] Enable scroll wheel on MS Office and similar
+                       keyboards
+
+       atkbd.softraw=  [HW] Choose between synthetic and real raw mode
+                       Format: <bool> (0 = real, 1 = synthetic (default))

        
        atkbd.softrepeat=
                        [HW] Use software keyboard repeat
        
        atkbd.softrepeat=
                        [HW] Use software keyboard repeat


@@ -311,8 +320,24 @@ running once the system is up.
        condev=         [HW,S390] console device
        conmode=
  
        condev=         [HW,S390] console device
        conmode=
  

-       console=        [KNL] Output console
-                       Console device and comm spec (speed, control, parity).
+       console=        [KNL] Output console device and options.
+
+               tty<n>  Use the virtual console device <n>.
+
+               ttyS<n>[,options]
+                       Use the specified serial port.  The options are of
+                       the form "bbbbpn", where "bbbb" is the baud rate,
+                       "p" is parity ("n", "o", or "e"), and "n" is bits.
+                       Default is "9600n8".
+
+                       See also Documentation/serial-console.txt.
+
+               uart,io,<addr>[,options]
+               uart,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.

 
        cpcihp_generic= [HW,PCI] Generic port I/O CompactPCI driver
                        Format: <first_slot>,<last_slot>,<port>,<enum_bit>[,<debug>]
 
        cpcihp_generic= [HW,PCI] Generic port I/O CompactPCI driver
                        Format: <first_slot>,<last_slot>,<port>,<enum_bit>[,<debug>]


@@ -391,10 +416,14 @@ running once the system is up.
 
        edb=            [HW,PS2]
 
 
        edb=            [HW,PS2]
 

+       edd=            [EDD]
+                       Format: {"of[f]" | "sk[ipmbr]"}
+                       See comment in arch/i386/boot/edd.S
+

        eicon=          [HW,ISDN] 
                        Format: <id>,<membase>,<irq>
 
        eicon=          [HW,ISDN] 
                        Format: <id>,<membase>,<irq>
 

-       eisa_irq_edge=  [PARISC]
+       eisa_irq_edge=  [PARISC,HW]

                        See header of drivers/parisc/eisa.c.
 
        elanfreq=       [IA-32]
                        See header of drivers/parisc/eisa.c.
 
        elanfreq=       [IA-32]


@@ -403,7 +432,8 @@ running once the system is up.
 
        elevator=       [IOSCHED]
                        Format: {"as"|"cfq"|"deadline"|"noop"}
 
        elevator=       [IOSCHED]
                        Format: {"as"|"cfq"|"deadline"|"noop"}

-                       See Documentation/as-iosched.txt for details
+                       See Documentation/block/as-iosched.txt
+                       and Documentation/block/deadline-iosched.txt for details.

 
        es1370=         [HW,OSS]
                        Format: <lineout>[,<micbias>]
 
        es1370=         [HW,OSS]
                        Format: <lineout>[,<micbias>]


@@ -456,6 +486,10 @@ running once the system is up.
  
        gvp11=          [HW,SCSI]
 
  
        gvp11=          [HW,SCSI]
 

+       hashdist=       [KNL,NUMA] Large hashes allocated during boot
+                       are distributed across NUMA nodes.  Defaults on
+                       for IA-64, off otherwise.
+

        hcl=            [IA-64] SGI's Hardware Graph compatibility layer
 
        hd=             [EIDE] (E)IDE hard drive subsystem geometry
        hcl=            [IA-64] SGI's Hardware Graph compatibility layer
 
        hd=             [EIDE] (E)IDE hard drive subsystem geometry


@@ -480,6 +514,8 @@ running once the system is up.
        i8042.dumbkbd   [HW] Pretend that controlled can only read data from
                             keyboard and can not control its state
                             (Don't attempt to blink the leds)
        i8042.dumbkbd   [HW] Pretend that controlled can only read data from
                             keyboard and can not control its state
                             (Don't attempt to blink the leds)

+       i8042.noacpi    [HW] Don't use ACPI to discover KBD/AUX controller
+                            settings

        i8042.noaux     [HW] Don't check for auxiliary (== mouse) port
        i8042.nomux     [HW] Don't check presence of an active multiplexing
                             controller
        i8042.noaux     [HW] Don't check for auxiliary (== mouse) port
        i8042.nomux     [HW] Don't check presence of an active multiplexing
                             controller


@@ -488,16 +524,26 @@ running once the system is up.
 
        i810=           [HW,DRM]
 
 
        i810=           [HW,DRM]
 

+       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>]]]
 
        ibmmcascsi=     [HW,MCA,SCSI] IBM MicroChannel SCSI adapter
                        See Documentation/mca.txt.
 
        icn=            [HW,ISDN]
                        Format: <io>[,<membase>[,<icn_id>[,<icn_id2>]]]
 

+       ide=            [HW] (E)IDE subsystem
+                       Format: ide=nodma or ide=doubler or ide=reverse
+                       See Documentation/ide.txt.
+

        ide?=           [HW] (E)IDE subsystem
        ide?=           [HW] (E)IDE subsystem

-                       Config (iomem/irq), tuning or debugging
-                       (serialize,reset,no{dma,tune,probe}) or chipset
-                       specific parameters.
+                       Format: ide?=noprobe or chipset specific parameters.

                        See Documentation/ide.txt.
        
        idebus=         [HW] (E)IDE subsystem - VLB/PCI bus speed
                        See Documentation/ide.txt.
        
        idebus=         [HW] (E)IDE subsystem - VLB/PCI bus speed


@@ -545,11 +591,13 @@ running once the system is up.
                        Format: <RDP>, <reset>, <pci_scan>, <verbosity>
 
        isolcpus=       [KNL,SMP] Isolate CPUs from the general scheduler.
                        Format: <RDP>, <reset>, <pci_scan>, <verbosity>
 
        isolcpus=       [KNL,SMP] Isolate CPUs from the general scheduler.

-                       Format: <cpu number>, ..., <cpu number>
+                       Format: <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. The only way to move a process onto or off
                        an "isolated" CPU is via the CPU affinity syscalls.
                        This option can be used to specify one or more CPUs
                        to isolate from the general SMP balancing and scheduling
                        algorithms. The only way to move a process onto or off
                        an "isolated" CPU is via the CPU affinity syscalls.

+                       <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
 
                        This option is the preferred way to isolate CPUs. The
                        alternative - manually setting the CPU mask of all tasks


@@ -629,7 +677,11 @@ running once the system is up.
 
        mac53c9x=       [HW,SCSI]
                        Format: <num_esps>,<disconnect>,<nosync>,<can_queue>,<cmd_per_lun>,<sg_tablesize>,<hostid>,<use_tags>
 
        mac53c9x=       [HW,SCSI]
                        Format: <num_esps>,<disconnect>,<nosync>,<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
+

        mad16=          [HW,OSS]
                        Format: <io>,<irq>,<dma>,<dma16>,<mpu_io>,<mpu_irq>,<joystick>
 
        mad16=          [HW,OSS]
                        Format: <io>,<irq>,<dma>,<dma16>,<mpu_io>,<mpu_irq>,<joystick>
 


@@ -643,9 +695,10 @@ running once the system is up.
        maxcpus=        [SMP] Maximum number of processors that an SMP kernel
                        should make use of
 
        maxcpus=        [SMP] Maximum number of processors that an SMP kernel
                        should make use of
 

-       max_scsi_luns=  [SCSI]
+       max_luns=       [SCSI] Maximum number of LUNs to probe
+                       Should be between 1 and 2^32-1.

 
 

-       max_scsi_report_luns=
+       max_report_luns=

                        [SCSI] Maximum number of LUNs received
                        Should be between 1 and 16384.
 
                        [SCSI] Maximum number of LUNs received
                        Should be between 1 and 16384.
 


@@ -670,6 +723,9 @@ running once the system is up.
        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.
        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.

+                       [IA-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=IA-32] Disable usage of 4MB pages for kernel
                        memory.
 
        mem=nopentium   [BUGS=IA-32] Disable usage of 4MB pages for kernel
                        memory.


@@ -692,7 +748,7 @@ running once the system is up.
                        [KNL,ACPI] Mark specific memory as reserved.
                        Region of memory to be used, from ss to ss+nn.
 
                        [KNL,ACPI] Mark specific memory as reserved.
                        Region of memory to be used, from ss to ss+nn.
 

-       meye=           [HW] Set MotionEye Camera parameters
+       meye.*=         [HW] Set MotionEye Camera parameters

                        See Documentation/video4linux/meye.txt.
 
        mga=            [HW,DRM]
                        See Documentation/video4linux/meye.txt.
 
        mga=            [HW,DRM]


@@ -754,8 +810,8 @@ running once the system is up.
 
        noalign         [KNL,ARM] 
  
 
        noalign         [KNL,ARM] 
  

-       noapic          [SMP,APIC] Tells the kernel not to make use of any
-                       APIC that may be present on the system.
+       noapic          [SMP,APIC] Tells the kernel to not make use of any
+                       IOAPICs that may be present in the system.

 
        noasync         [HW,M68K] Disables async and sync negotiation for
                        all devices.
 
        noasync         [HW,M68K] Disables async and sync negotiation for
                        all devices.


@@ -769,14 +825,12 @@ running once the system is up.
 
        noexec          [IA-64]
 
 
        noexec          [IA-64]
 

-       noexec          [i386]
+       noexec          [i386, x86_64]

                        noexec=on: enable non-executable mappings (default)
                        noexec=off: disable nn-executable mappings
 
        nofxsr          [BUGS=IA-32]
 
                        noexec=on: enable non-executable mappings (default)
                        noexec=off: disable nn-executable mappings
 
        nofxsr          [BUGS=IA-32]
 

-       nohighio        [BUGS=IA-32] Disable highmem block I/O.
-

        nohlt           [BUGS=ARM]
  
        no-hlt          [BUGS=IA-32] Tells the kernel that the hlt
        nohlt           [BUGS=ARM]
  
        no-hlt          [BUGS=IA-32] Tells the kernel that the hlt


@@ -842,6 +896,13 @@ running once the system is up.
        panic=          [KNL] Kernel behaviour on panic
                        Format: <timeout>
 
        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=0       [HW,PPT]        Specify parallel ports. 0 disables.
        parport=auto                    Use 'auto' to force the driver to use
        parport=0xBBB[,IRQ[,DMA]]       any IRQ/DMA settings detected (the
        parport=0       [HW,PPT]        Specify parallel ports. 0 disables.
        parport=auto                    Use 'auto' to force the driver to use
        parport=0xBBB[,IRQ[,DMA]]       any IRQ/DMA settings detected (the


@@ -857,6 +918,16 @@ running once the system is up.
                                        order they are specified on the command
                                        line, starting with parport0.
 
                                        order they are specified on the command
                                        line, starting with parport0.
 

+       parport_init_mode=
+                       [HW,PPT]        Configure VIA parallel port to
+                                       operate in 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>
  
        pas2=           [HW,OSS]
                        Format: <io>,<irq>,<dma>,<dma16>,<sb_io>,<sb_irq>,<sb_dma>,<sb_dma16>
  


@@ -912,6 +983,10 @@ running once the system is up.
                                        enabled.
                noacpi                  [IA-32] Do not use ACPI for IRQ routing
                                        or for PCI scanning.
                                        enabled.
                noacpi                  [IA-32] Do not use ACPI for IRQ routing
                                        or for PCI scanning.

+               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.

 
                firmware                [ARM] Do not re-enumerate the bus but
                                        instead just use the configuration
 
                firmware                [ARM] Do not re-enumerate the bus but
                                        instead just use the configuration


@@ -925,6 +1000,11 @@ running once the system is up.
        pd.             [PARIDE]
                        See Documentation/paride.txt.
 
        pd.             [PARIDE]
                        See Documentation/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/paride.txt.
 
        pf.             [PARIDE]
                        See Documentation/paride.txt.
 


@@ -938,6 +1018,9 @@ running once the system is up.
                        Format: { parport<nr> | timid | 0 }
                        See also Documentation/parport.txt.
 
                        Format: { parport<nr> | timid | 0 }
                        See also Documentation/parport.txt.
 

+       pnpacpi=        [ACPI]
+                       { off }
+

        pnpbios=        [ISAPNP]
                        { on | off | curr | res | no-curr | no-res }
 
        pnpbios=        [ISAPNP]
                        { on | off | curr | res | no-curr | no-res }
 


@@ -960,6 +1043,10 @@ running once the system is up.
                        (param: profile step/bucket size as a power of 2 for
                                statistical time based profiling)
 
                        (param: profile step/bucket size as a power of 2 for
                                statistical time based profiling)
 

+       processor.max_cstate=   [HW, ACPI]
+                       Limit processor to maximum C-state
+                       max_cstate=9 overrides any DMI blacklist limit.
+

        prompt_ramdisk= [RAM] List of RAM disks to prompt for floppy disk
                        before loading.
                        See Documentation/ramdisk.txt.
        prompt_ramdisk= [RAM] List of RAM disks to prompt for floppy disk
                        before loading.
                        See Documentation/ramdisk.txt.


@@ -1001,10 +1088,6 @@ running once the system is up.
                        New name for the ramdisk parameter.
                        See Documentation/ramdisk.txt.
 
                        New name for the ramdisk parameter.
                        See Documentation/ramdisk.txt.
 

-       ramdisk_start=  [RAM] Starting block of RAM disk image (so you can
-                       place it after the kernel image on a boot floppy).
-                       See Documentation/ramdisk.txt.
-

        reboot=         [BUGS=IA-32,BUGS=ARM,BUGS=IA-64] Rebooting mode
                        Format: <reboot_mode>[,<reboot_mode2>[,...]]
                        See arch/*/kernel/reboot.c.
        reboot=         [BUGS=IA-32,BUGS=ARM,BUGS=IA-64] Rebooting mode
                        Format: <reboot_mode>[,<reboot_mode2>[,...]]
                        See arch/*/kernel/reboot.c.


@@ -1023,6 +1106,9 @@ running once the system is up.
 
        root=           [KNL] Root filesystem
 
 
        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
        rootflags=      [KNL] Set root filesystem mount option string
 
        rootfstype=     [KNL] Set root filesystem type


@@ -1060,8 +1146,6 @@ running once the system is up.
 
        scsi_logging=   [SCSI]
 
 
        scsi_logging=   [SCSI]
 

-       scsihosts=      [SCSI]
-

        serialnumber    [BUGS=IA-32]
 
        sf16fm=         [HW] SF16FMI radio driver for Linux
        serialnumber    [BUGS=IA-32]
 
        sf16fm=         [HW] SF16FMI radio driver for Linux


@@ -1219,17 +1303,12 @@ running once the system is up.
        sonycd535=      [HW,CD]
                        Format: <io>[,<irq>]
 
        sonycd535=      [HW,CD]
                        Format: <io>[,<irq>]
 

-       sonypi=         [HW] Sony Programmable I/O Control Device driver
-                       Format: <minor>,<verbose>,<fnkeyinit>,<camera>,<compat>,<nojogdial>
+       sonypi.*=       [HW] Sony Programmable I/O Control Device driver
+                       See Documentation/sonypi.txt

 
        specialix=      [HW,SERIAL] Specialix multi-serial port adapter
                        See Documentation/specialix.txt.
 
 
        specialix=      [HW,SERIAL] Specialix multi-serial port adapter
                        See Documentation/specialix.txt.
 

-       speedstep_coppermine=
-                       [HW,IA-32] Take CPU in your notebook as SpeedStep-capable
-                       See comment before function speedstep_setup() in
-                       arch/i386/kernel/cpu/cpufreq/speedstep.c.
-

        spia_io_base=   [HW,MTD]
        spia_fio_base=
        spia_pedr=
        spia_io_base=   [HW,MTD]
        spia_fio_base=
        spia_pedr=


@@ -1244,7 +1323,7 @@ running once the system is up.
        st0x=           [HW,SCSI]
                        See header of drivers/scsi/seagate.c.
 
        st0x=           [HW,SCSI]
                        See header of drivers/scsi/seagate.c.
 

-       sti=            [HW]
+       sti=            [PARISC,HW]

                        Format: <num>
                        Set the STI (builtin display/keyboard on the HP-PARISC
                        machines) console (graphic card) which should be used
                        Format: <num>
                        Set the STI (builtin display/keyboard on the HP-PARISC
                        machines) console (graphic card) which should be used


@@ -1277,12 +1356,13 @@ running once the system is up.
        thash_entries=  [KNL,NET]
                        Set number of hash buckets for TCP connection
 
        thash_entries=  [KNL,NET]
                        Set number of hash buckets for TCP connection
 

-       tipar=          [HW]
-                       See header of drivers/char/tipar.c.
+       tipar.timeout=  [HW,PPT]
+                       Set communications timeout in tenths of a second
+                       (default 15).
+
+       tipar.delay=    [HW,PPT]
+                       Set inter-bit delay in microseconds (default 10).

 
 

-       tiusb=          [HW,USB] Texas Instruments' USB GraphLink (aka SilverLink)
-                       Format: <timeout>
- 

        tmc8xx=         [HW,SCSI]
                        See header of drivers/scsi/seagate.c.
 
        tmc8xx=         [HW,SCSI]
                        See header of drivers/scsi/seagate.c.
 


@@ -1311,6 +1391,8 @@ running once the system is up.
 
        uart6850=       [HW,OSS]
                        Format: <io>,<irq>
 
        uart6850=       [HW,OSS]
                        Format: <io>,<irq>

+
+       usb-handoff     [HW] Enable early USB BIOS -> OS handoff

  
        video=          [FB] Frame buffer configuration
                        See Documentation/fb/modedb.txt.
  
        video=          [FB] Frame buffer configuration
                        See Documentation/fb/modedb.txt.