Merge branch 'linus' into release

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

diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index f3a89fac220279bbdf84dbe3bcc2c8da666651f3..fcc48bf722a8f635768912ee421156b37aab44fe 100644 (file)
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -89,7 +89,9 @@ parameter is applicable:
        SPARC   Sparc architecture is enabled.
        SWSUSP  Software suspend (hibernation) is enabled.
        SUSPEND System suspend states are enabled.
        SPARC   Sparc architecture is enabled.
        SWSUSP  Software suspend (hibernation) is enabled.
        SUSPEND System suspend states are enabled.

+       FTRACE  Function tracing enabled.

        TS      Appropriate touchscreen support is enabled.
        TS      Appropriate touchscreen support is enabled.

+       UMS     USB Mass Storage support is enabled.

        USB     USB support is enabled.
        USBHID  USB Human Interface Device support is enabled.
        V4L     Video For Linux support is enabled.
        USB     USB support is enabled.
        USBHID  USB Human Interface Device support is enabled.
        V4L     Video For Linux support is enabled.


@@ -473,8 +475,8 @@ and is between 256 and 4096 characters. It is defined in the file
 
        clearcpuid=BITNUM [X86]
                        Disable CPUID feature X for the kernel. See
 
        clearcpuid=BITNUM [X86]
                        Disable CPUID feature X for the kernel. See

-                       include/asm-x86/cpufeature.h for the valid bit numbers.
-                       Note the Linux specific bits are not necessarily
+                       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
                        stable over kernel options, but the vendor specific
                        ones should be.
                        Also note that user programs calling CPUID directly


@@ -555,6 +557,11 @@ and is between 256 and 4096 characters. It is defined in the file
                        not work reliably with all consoles, but is known
                        to work with serial and VGA consoles.
 
                        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>]
        cpcihp_generic= [HW,PCI] Generic port I/O CompactPCI driver
                        Format:
                        <first_slot>,<last_slot>,<port>,<enum_bit>[,<debug>]


@@ -758,6 +765,14 @@ and is between 256 and 4096 characters. It is defined in the file
                        parameter will force ia64_sal_cache_flush to call
                        ia64_pal_cache_flush instead of SAL_CACHE_FLUSH.
 
                        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)
        gamecon.map[2|3]=
                        [HW,JOY] Multisystem joystick and NES/SNES/PSX pad
                        support via parallel port (up to 5 devices per port)


@@ -819,6 +834,9 @@ and is between 256 and 4096 characters. It is defined in the file
 
        hlt             [BUGS=ARM,SH]
 
 
        hlt             [BUGS=ARM,SH]
 

+       hvc_iucv=       [S390] Number of z/VM IUCV Hypervisor console (HVC)
+                              back-ends. Valid parameters: 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
        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


@@ -908,6 +926,10 @@ and is between 256 and 4096 characters. It is defined in the file
 
        inttest=        [IA64]
 
 
        inttest=        [IA64]
 

+       iomem=          Disable strict checking of access to MMIO memory
+               strict  regions from userspace.
+               relaxed
+

        iommu=          [x86]
                off
                force
        iommu=          [x86]
                off
                force


@@ -1112,6 +1134,8 @@ and is between 256 and 4096 characters. It is defined in the file
                        If there are multiple matching configurations changing
                        the same attribute, the last one is used.
 
                        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.
 
        load_ramdisk=   [RAM] List of ramdisks to load from floppy
                        See Documentation/blockdev/ramdisk.txt.
 


@@ -1403,7 +1427,20 @@ and is between 256 and 4096 characters. It is defined in the file
                        when a NMI is triggered.
                        Format: [state][,regs][,debounce][,die]
 
                        when a NMI is triggered.
                        Format: [state][,regs][,debounce][,die]
 

-       nmi_watchdog=   [KNL,BUGS=X86-32] Debugging features for SMP kernels
+       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
 
        no387           [BUGS=X86-32] Tells the kernel to use the 387 maths
                        emulation library even if a 387 maths coprocessor


@@ -1459,6 +1496,10 @@ and is between 256 and 4096 characters. It is defined in the file
                        instruction doesn't work correctly and not to
                        use it.
 
                        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
        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


@@ -1528,6 +1569,9 @@ and is between 256 and 4096 characters. It is defined in the file
 
        nosoftlockup    [KNL] Disable the soft-lockup detector.
 
 
        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
        nosync          [HW,M68K] Disables sync negotiation for all devices.
 
        notsc           [BUGS=X86-32] Disable Time Stamp Counter


@@ -1547,6 +1591,10 @@ and is between 256 and 4096 characters. It is defined in the file
 
        nr_uarts=       [SERIAL] maximum number of UARTs to be registered.
 
 
        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
        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


@@ -1636,6 +1684,17 @@ and is between 256 and 4096 characters. It is defined in the file
                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.
                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
                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


@@ -1760,10 +1819,10 @@ and is between 256 and 4096 characters. It is defined in the file
                        autoconfiguration.
                        Ranges are in pairs (memory base and size).
 
                        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
+       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=
                        [KNL] debug: print fatal signals


@@ -1851,7 +1910,7 @@ and is between 256 and 4096 characters. It is defined in the file
 
        reboot=         [BUGS=X86-32,BUGS=ARM,BUGS=IA-64] Rebooting mode
                        Format: <reboot_mode>[,<reboot_mode2>[,...]]
 
        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                   
+                       See arch/*/kernel/reboot.c or arch/*/kernel/process.c

 
        relax_domain_level=
                        [KNL, SMP] Set scheduler's default relax_domain_level.
 
        relax_domain_level=
                        [KNL, SMP] Set scheduler's default relax_domain_level.


@@ -2175,6 +2234,9 @@ and is between 256 and 4096 characters. It is defined in the file
        st=             [HW,SCSI] SCSI tape parameters (buffers, etc.)
                        See Documentation/scsi/st.txt.
 
        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
        sti=            [PARISC,HW]
                        Format: <num>
                        Set the STI (builtin display/keyboard on the HP-PARISC


@@ -2260,12 +2322,27 @@ and is between 256 and 4096 characters. It is defined in the file
                        See comment before function dc390_setup() in
                        drivers/scsi/tmscsim.c.
 
                        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>
 
        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:
        turbografx.map[2|3]=    [HW,JOY]
                        TurboGraFX parallel port interface
                        Format:


@@ -2322,6 +2399,41 @@ 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.
 

+       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.
 
        add_efi_memmap  [EFI; x86-32,X86-64] Include EFI memory map in
                        kernel's map of available physical RAM.
 


@@ -2382,8 +2494,8 @@ and is between 256 and 4096 characters. It is defined in the file
                        Format:
                        <irq>,<irq_mask>,<io>,<full_duplex>,<do_sound>,<lockup_hack>[,<irq2>[,<irq3>[,<irq4>]]]
 
                        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
+       norandmaps      Don't use address space randomization.  Equivalent to
+                       echo 0 > /proc/sys/kernel/randomize_va_space

 
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