relay: add buffer-only channels; useful for early logging

[safe/jmp/linux-2.6] / Documentation / kernel-parameters.txt

diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index 18d793e..e7bea3e 100644 (file)
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -87,7 +87,8 @@ parameter is applicable:
        SH      SuperH architecture is enabled.
        SMP     The kernel is an SMP kernel.
        SPARC   Sparc architecture is enabled.
        SH      SuperH architecture is enabled.
        SMP     The kernel is an SMP kernel.
        SPARC   Sparc architecture is enabled.

-       SWSUSP  Software suspend is enabled.
+       SWSUSP  Software suspend (hibernation) is enabled.
+       SUSPEND System suspend states are enabled.

        TS      Appropriate touchscreen support is enabled.
        USB     USB support is enabled.
        USBHID  USB Human Interface Device support is enabled.
        TS      Appropriate touchscreen support is enabled.
        USB     USB support is enabled.
        USBHID  USB Human Interface Device support is enabled.


@@ -147,10 +148,12 @@ and is between 256 and 4096 characters. It is defined in the file
                        default: 0
 
        acpi_sleep=     [HW,ACPI] Sleep options
                        default: 0
 
        acpi_sleep=     [HW,ACPI] Sleep options

-                       Format: { s3_bios, s3_mode, s3_beep, old_ordering }
+                       Format: { s3_bios, s3_mode, s3_beep, s4_nohwsig, old_ordering }

                        See Documentation/power/video.txt for s3_bios and s3_mode.
                        s3_beep is for debugging; it makes the PC's speaker beep
                        as soon as the kernel's real-mode entry point is called.
                        See Documentation/power/video.txt for s3_bios and s3_mode.
                        s3_beep is for debugging; it makes the PC's speaker beep
                        as soon as the kernel's real-mode entry point is called.

+                       s4_nohwsig prevents ACPI hardware signature from being
+                       used during resume from hibernation.

                        old_ordering causes the ACPI 1.0 ordering of the _PTS
                        control method, wrt putting devices into low power
                        states, to be enforced (the ACPI 2.0 ordering of _PTS is
                        old_ordering causes the ACPI 1.0 ordering of the _PTS
                        control method, wrt putting devices into low power
                        states, to be enforced (the ACPI 2.0 ordering of _PTS is


@@ -275,6 +278,17 @@ and is between 256 and 4096 characters. It is defined in the file
        aic79xx=        [HW,SCSI]
                        See Documentation/scsi/aic79xx.txt.
 
        aic79xx=        [HW,SCSI]
                        See Documentation/scsi/aic79xx.txt.
 

+       amd_iommu=      [HW,X86-84]
+                       Pass parameters to the AMD IOMMU driver in the system.
+                       Possible values are:
+                       isolate - enable device isolation (each device, as far
+                                 as possible, will get its own protection
+                                 domain)
+       amd_iommu_size= [HW,X86-64]
+                       Define the size of the aperture for the AMD IOMMU
+                       driver. Possible values are:
+                       '32M', '64M' (default), '128M', '256M', '512M', '1G'
+

        amijoy.map=     [HW,JOY] Amiga joystick support
                        Map of devices attached to JOY0DAT and JOY1DAT
                        Format: <a>,<b>
        amijoy.map=     [HW,JOY] Amiga joystick support
                        Map of devices attached to JOY0DAT and JOY1DAT
                        Format: <a>,<b>


@@ -299,7 +313,7 @@ and is between 256 and 4096 characters. It is defined in the file
                        when initialising the APIC and IO-APIC components.
 
        apm=            [APM] Advanced Power Management
                        when initialising the APIC and IO-APIC components.
 
        apm=            [APM] Advanced Power Management

-                       See header of arch/i386/kernel/apm.c.
+                       See header of arch/x86/kernel/apm_32.c.

 
        arcrimi=        [HW,NET] ARCnet - "RIM I" (entirely mem-mapped) cards
                        Format: <io>,<irq>,<nodeID>
 
        arcrimi=        [HW,NET] ARCnet - "RIM I" (entirely mem-mapped) cards
                        Format: <io>,<irq>,<nodeID>


@@ -564,6 +578,8 @@ and is between 256 and 4096 characters. It is defined in the file
 
        debug_objects   [KNL] Enable object debugging
 
 
        debug_objects   [KNL] Enable object debugging
 

+       debugpat        [X86] Enable PAT debugging
+

        decnet.addr=    [HW,NET]
                        Format: <area>[,<node>]
                        See also Documentation/networking/decnet.txt.
        decnet.addr=    [HW,NET]
                        Format: <area>[,<node>]
                        See also Documentation/networking/decnet.txt.


@@ -603,6 +619,29 @@ 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_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
        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


@@ -642,7 +681,7 @@ and is between 256 and 4096 characters. It is defined in the file
 
        elanfreq=       [X86-32]
                        See comment before function elanfreq_setup() in
 
        elanfreq=       [X86-32]
                        See comment before function elanfreq_setup() in

-                       arch/i386/kernel/cpu/cpufreq/elanfreq.c.
+                       arch/x86/kernel/cpu/cpufreq/elanfreq.c.

 
        elevator=       [IOSCHED]
                        Format: {"anticipatory" | "cfq" | "deadline" | "noop"}
 
        elevator=       [IOSCHED]
                        Format: {"anticipatory" | "cfq" | "deadline" | "noop"}


@@ -726,9 +765,6 @@ and is between 256 and 4096 characters. It is defined in the file
        hd=             [EIDE] (E)IDE hard drive subsystem geometry
                        Format: <cyl>,<head>,<sect>
 
        hd=             [EIDE] (E)IDE hard drive subsystem geometry
                        Format: <cyl>,<head>,<sect>
 

-       hd?=            [HW] (E)IDE subsystem
-       hd?lun=         See Documentation/ide/ide.txt.
-

        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
        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


@@ -741,8 +777,22 @@ and is between 256 and 4096 characters. It is defined in the file
        hisax=          [HW,ISDN]
                        See Documentation/isdn/README.HiSax.
 
        hisax=          [HW,ISDN]
                        See Documentation/isdn/README.HiSax.
 

-       hugepages=      [HW,X86-32,IA-64] Maximal number of HugeTLB pages.
-       hugepagesz=     [HW,IA-64,PPC] The size of the HugeTLB pages.
+       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.

 
        i8042.direct    [HW] Put keyboard port into non-translated mode
        i8042.dumbkbd   [HW] Pretend that controller can only read data from
 
        i8042.direct    [HW] Put keyboard port into non-translated mode
        i8042.dumbkbd   [HW] Pretend that controller can only read data from


@@ -789,7 +839,7 @@ and is between 256 and 4096 characters. It is defined in the file
                        See Documentation/ide/ide.txt.
 
        idle=           [X86]
                        See Documentation/ide/ide.txt.
 
        idle=           [X86]

-                       Format: idle=poll or idle=mwait
+                       Format: idle=poll or idle=mwait, idle=halt, idle=nomwait

                        Poll forces a polling idle loop that can slightly improves the performance
                        of waking up a idle CPU, but will use a lot of power and make the system
                        run hot. Not recommended.
                        Poll forces a polling idle loop that can slightly improves the performance
                        of waking up a idle CPU, but will use a lot of power and make the system
                        run hot. Not recommended.


@@ -797,6 +847,9 @@ and is between 256 and 4096 characters. It is defined in the file
                        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.
                        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.
 
        ide-pci-generic.all-generic-ide [HW] (E)IDE subsystem
                        Claim all unknown PCI IDE storage controllers.


@@ -1170,7 +1223,7 @@ and is between 256 and 4096 characters. It is defined in the file
                                 or
                                 memmap=0x10000$0x18690000
 
                                 or
                                 memmap=0x10000$0x18690000
 

-       memtest=        [KNL,X86_64] Enable memtest
+       memtest=        [KNL,X86] Enable memtest

                        Format: <integer>
                        range: 0,4 : pattern number
                        default : 0 <disable>
                        Format: <integer>
                        range: 0,4 : pattern number
                        default : 0 <disable>


@@ -1189,6 +1242,14 @@ and is between 256 and 4096 characters. It is defined in the file
 
        mga=            [HW,DRM]
 
 
        mga=            [HW,DRM]
 

+       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
        mousedev.tap_time=
                        [MOUSE] Maximum time between finger touching and
                        leaving touchpad surface for touch to be considered


@@ -1212,6 +1273,11 @@ and is between 256 and 4096 characters. It is defined in the file
        mtdparts=       [MTD]
                        See drivers/mtd/cmdlinepart.c.
 
        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')
        mtouchusb.raw_coordinates=
                        [HW] Make the MicroTouch USB driver use raw coordinates
                        ('y', default) or cooked coordinates ('n')


@@ -1238,6 +1304,13 @@ and is between 256 and 4096 characters. It is defined in the file
                        This usage is only documented in each driver source
                        file if at all.
 
                        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.
 
        nfsaddrs=       [NFS]
                        See Documentation/filesystems/nfsroot.txt.
 


@@ -1578,6 +1651,10 @@ and is between 256 and 4096 characters. It is defined in the file
                        Format: { parport<nr> | timid | 0 }
                        See also Documentation/parport.txt.
 
                        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
+

        pnpacpi=        [ACPI]
                        { off }
 
        pnpacpi=        [ACPI]
                        { off }
 


@@ -1686,6 +1763,10 @@ and is between 256 and 4096 characters. It is defined in the file
                        Format: <reboot_mode>[,<reboot_mode2>[,...]]
                        See arch/*/kernel/reboot.c or arch/*/kernel/process.c                   
 
                        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]
        reserve=        [KNL,BUGS] Force the kernel to ignore some iomem area
 
        reservetop=     [X86-32]


@@ -1978,6 +2059,9 @@ and is between 256 and 4096 characters. It is defined in the file
 
        snd-ymfpci=     [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
 
        sonypi.*=       [HW] Sony Programmable I/O Control Device driver
                        See Documentation/sonypi.txt
 


@@ -2042,6 +2126,12 @@ and is between 256 and 4096 characters. It is defined in the file
 
        tdfx=           [HW,DRM]
 
 
        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
 
        thash_entries=  [KNL,NET]
                        Set number of hash buckets for TCP connection
 


@@ -2069,13 +2159,6 @@ and is between 256 and 4096 characters. It is defined in the file
                        <deci-seconds>: poll all this frequency
                        0: no polling (default)
 
                        <deci-seconds>: poll all this frequency
                        0: no polling (default)
 

-       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).
-

        tmscsim=        [HW,SCSI]
                        See comment before function dc390_setup() in
                        drivers/scsi/tmscsim.c.
        tmscsim=        [HW,SCSI]
                        See comment before function dc390_setup() in
                        drivers/scsi/tmscsim.c.


@@ -2109,6 +2192,10 @@ and is between 256 and 4096 characters. It is defined in the file
                        Note that genuine overcurrent events won't be
                        reported either.
 
                        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
        usbcore.autosuspend=
                        [USB] The autosuspend time delay (in seconds) used
                        for newly-detected USB devices (default 2).  This


@@ -2119,6 +2206,9 @@ and is between 256 and 4096 characters. It is defined in the file
        usbhid.mousepoll=
                        [USBHID] The interval which mice are to be polled at.
 
        usbhid.mousepoll=
                        [USBHID] The interval which mice are to be polled at.
 

+       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=           [X86-32,SH,x86-64]
                        vdso=2: enable compat VDSO (default with COMPAT_VDSO)
                        vdso=1: enable VDSO (default)