x86: add noclflush option

[linux-2.6-omap-h63xx.git] / Documentation / kernel-parameters.txt

diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index 33121d6c827c6e5fcc85d72b1f5ee5f166b743a2..040e30a33b7c5582451f95dd233d6c4692d1fe91 100644 (file)
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -34,6 +34,7 @@ parameter is applicable:
        ALSA    ALSA sound support is enabled.
        APIC    APIC support is enabled.
        APM     Advanced Power Management support is enabled.
        ALSA    ALSA sound support is enabled.
        APIC    APIC support is enabled.
        APM     Advanced Power Management support is enabled.

+       AVR32   AVR32 architecture is enabled.

        AX25    Appropriate AX.25 support is enabled.
        BLACKFIN Blackfin architecture is enabled.
        DRM     Direct Rendering Management support is enabled.
        AX25    Appropriate AX.25 support is enabled.
        BLACKFIN Blackfin architecture is enabled.
        DRM     Direct Rendering Management support is enabled.


@@ -369,7 +370,8 @@ and is between 256 and 4096 characters. It is defined in the file
                        configured.  Potentially dangerous and should only be
                        used if you are entirely sure of the consequences.
 
                        configured.  Potentially dangerous and should only be
                        used if you are entirely sure of the consequences.
 

-       chandev=        [HW,NET] Generic channel device initialisation
+       ccw_timeout_log [S390]
+                       See Documentation/s390/CommonIO for details.

 
        checkreqprot    [SELINUX] Set initial checkreqprot flag value.
                        Format: { "0" | "1" }
 
        checkreqprot    [SELINUX] Set initial checkreqprot flag value.
                        Format: { "0" | "1" }


@@ -381,6 +383,12 @@ and is between 256 and 4096 characters. It is defined in the file
                        Value can be changed at runtime via
                                /selinux/checkreqprot.
 
                        Value can be changed at runtime via
                                /selinux/checkreqprot.
 

+       cio_ignore=     [S390]
+                       See Documentation/s390/CommonIO for details.
+
+       cio_msg=        [S390]
+                       See Documentation/s390/CommonIO for details.
+

        clock=          [BUGS=X86-32, HW] gettimeofday clocksource override.
                        [Deprecated]
                        Forces specified clocksource (if available) to be used
        clock=          [BUGS=X86-32, HW] gettimeofday clocksource override.
                        [Deprecated]
                        Forces specified clocksource (if available) to be used


@@ -408,8 +416,8 @@ and is between 256 and 4096 characters. It is defined in the file
                        [SPARC64] tick
                        [X86-64] hpet,tsc
 
                        [SPARC64] tick
                        [X86-64] hpet,tsc
 

-       code_bytes      [IA32] How many bytes of object code to print in an
-                       oops report.
+       code_bytes      [IA32/X86_64] How many bytes of object code to print
+                       in an oops report.

                        Range: 0 - 8192
                        Default: 64
 
                        Range: 0 - 8192
                        Default: 64
 


@@ -527,29 +535,30 @@ and is between 256 and 4096 characters. It is defined in the file
                        Format: <area>[,<node>]
                        See also Documentation/networking/decnet.txt.
 
                        Format: <area>[,<node>]
                        See also Documentation/networking/decnet.txt.
 

-       default_blu=    [VT]
+       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.
 
                        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.
 

-       default_grn=    [VT]
+       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.
 
                        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.
 

-       default_red=    [VT]
+       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.
 
                        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.
 

-       default_utf8=   [VT]
+       vt.default_utf8=
+                       [VT]

                        Format=<0|1>
                        Set system-wide default UTF-8 mode for all tty's.
                        Format=<0|1>
                        Set system-wide default UTF-8 mode for all tty's.

-                       Default is 0 and by setting to 1, it enables UTF-8
-                       mode for all newly opened or allocated terminals.
+                       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.
 
        dhash_entries=  [KNL]
                        Set number of hash buckets for dentry cache.


@@ -561,6 +570,12 @@ and is between 256 and 4096 characters. It is defined in the file
                        See drivers/char/README.epca and
                        Documentation/digiepca.txt.
 
                        See drivers/char/README.epca and
                        Documentation/digiepca.txt.
 

+       disable_mtrr_trim [X86-64, Intel 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]
        dmasound=       [HW,OSS] Sound subsystem buffers
 
        dscc4.setup=    [NET]


@@ -651,6 +666,10 @@ and is between 256 and 4096 characters. It is defined in the file
 
        gamma=          [HW,DRM]
 
 
        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.
 
        gdth=           [HW,SCSI]
                        See header of drivers/scsi/gdth.c.
 


@@ -785,6 +804,16 @@ and is between 256 and 4096 characters. It is defined in the file
                        for translation below 32 bit and if not available
                        then look in the higher range.
 
                        for translation below 32 bit and if not available
                        then look in the higher range.
 

+       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.
        io7=            [HW] IO7 for Marvel based alpha systems
                        See comment before marvel_specify_io7 in
                        arch/alpha/kernel/core_marvel.c.


@@ -882,6 +911,14 @@ and is between 256 and 4096 characters. It is defined in the file
        lapic_timer_c2_ok       [X86-32,x86-64,APIC] trust the local apic timer in
                        C2 power state.
 
        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.noacpi   [LIBATA] Disables use of ACPI in libata suspend/resume
                        when set.
                        Format: <int>


@@ -1114,6 +1151,10 @@ and is between 256 and 4096 characters. It is defined in the file
                        of returning the full 64-bit number.
                        The default is to return 64-bit inode numbers.
 
                        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] Debugging features for SMP kernels
 
        no387           [BUGS=X86-32] Tells the kernel to use the 387 maths
        nmi_watchdog=   [KNL,BUGS=X86-32] Debugging features for SMP kernels
 
        no387           [BUGS=X86-32] Tells the kernel to use the 387 maths


@@ -1138,6 +1179,8 @@ and is between 256 and 4096 characters. It is defined in the file
 
        nodisconnect    [HW,SCSI,M68K] Disables SCSI disconnects.
 
 
        nodisconnect    [HW,SCSI,M68K] Disables SCSI disconnects.
 

+       noefi           [X86-32,X86-64] Disable EFI runtime services support.
+

        noexec          [IA-64]
 
        noexec          [X86-32,X86-64]
        noexec          [IA-64]
 
        noexec          [X86-32,X86-64]


@@ -1148,6 +1191,8 @@ and is between 256 and 4096 characters. It is defined in the file
                        register save and restore. The kernel will only save
                        legacy floating-point registers on task switch.
 
                        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]
 
        no-hlt          [BUGS=X86-32] Tells the kernel that the hlt
        nohlt           [BUGS=ARM]
 
        no-hlt          [BUGS=X86-32] Tells the kernel that the hlt


@@ -1584,7 +1629,13 @@ and is between 256 and 4096 characters. It is defined in the file
                        Format: <vendor>:<model>:<flags>
                        (flags are integer value)
 
                        Format: <vendor>:<model>:<flags>
                        (flags are integer value)
 

-       scsi_logging=   [SCSI]
+       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,
 
        scsi_mod.scan=  [SCSI] sync (default) scans SCSI busses as they are
                        discovered.  async scans them in kernel threads,


@@ -1951,6 +2002,11 @@ and is between 256 and 4096 characters. It is defined in the file
                        vdso=1: enable VDSO (default)
                        vdso=0: disable VDSO mapping
 
                        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
 
        vector=         [IA-64,SMP]
                        vector=percpu: enable percpu vector domain