X-Git-Url: http://git.onelab.eu/?a=blobdiff_plain;f=Documentation%2Fx86_64%2Fboot-options.txt;h=1921353259aeeca2ab07f4ced32a8cd0f3edc559;hb=987b0145d94eecf292d8b301228356f44611ab7c;hp=d12607071491e8cbd48371c010e398a0c4b6b94f;hpb=433e2af4175021d339b067f6e7ee0a4e4c4f7e2d;p=linux-2.6.git

diff --git a/Documentation/x86_64/boot-options.txt b/Documentation/x86_64/boot-options.txt
index d12607071..192135325 100644
--- a/Documentation/x86_64/boot-options.txt
+++ b/Documentation/x86_64/boot-options.txt
@@ -6,6 +6,18 @@ only the AMD64 specific ones are listed here.
 Machine check
 
    mce=off disable machine check
+   mce=bootlog Enable logging of machine checks left over from booting.
+               Disabled by default on AMD because some BIOS leave bogus ones.
+               If your BIOS doesn't do that it's a good idea to enable though
+               to make sure you log even machine check events that result
+               in a reboot. On Intel systems it is enabled by default.
+   mce=nobootlog
+		Disable boot machine check logging.
+   mce=tolerancelevel (number)
+		0: always panic, 1: panic if deadlock possible,
+		2: try to avoid panic, 3: never panic or exit (for testing)
+		default is 1
+		Can be also set using sysfs which is preferable.
 
    nomce (for compatibility with i386): same as mce=off
 
@@ -14,8 +26,6 @@ Machine check
 APICs
 
    apic		 Use IO-APIC. Default
-		 Unless you have an NVidia or VIA/Uniprocessor board.
-		Then it defaults to off.
 
    noapic	 Don't use the IO-APIC.
 
@@ -25,6 +35,27 @@ APICs
 
    pirq=...	 See Documentation/i386/IO-APIC.txt
 
+   noapictimer	 Don't set up the APIC timer
+
+   no_timer_check Don't check the IO-APIC timer. This can work around
+		 problems with incorrect timer initialization on some boards.
+
+   apicmaintimer Run time keeping from the local APIC timer instead
+                 of using the PIT/HPET interrupt for this. This is useful
+                 when the PIT/HPET interrupts are unreliable.
+
+   noapicmaintimer  Don't do time keeping using the APIC timer.
+		 Useful when this option was auto selected, but doesn't work.
+
+   apicpmtimer
+		 Do APIC timer calibration using the pmtimer. Implies
+		 apicmaintimer. Useful when your PIT timer is totally
+		 broken.
+
+   disable_8254_timer / enable_8254_timer
+		 Enable interrupt 0 timer routing over the 8254 in addition to over
+	         the IO-APIC. The kernel tries to set a sensible default.
+
 Early Console
 
    syntax: earlyprintk=vga
@@ -44,7 +75,7 @@ Timing
   notsc
   Don't use the CPU time stamp counter to read the wall time.
   This can be used to work around timing problems on multiprocessor systems
-  with not properly synchronized CPUs. Only useful with a SMP kernel
+  with not properly synchronized CPUs.
 
   report_lost_ticks
   Report when timer interrupts are lost because some code turned off
@@ -61,6 +92,9 @@ Timing
   This is useful when you use a panic=... timeout and need the box
   quickly up again.
 
+  nohpet
+  Don't use the HPET timer.
+
 Idle loop
 
   idle=poll
@@ -68,13 +102,16 @@ Idle loop
   event. This will make the CPUs eat a lot more power, but may be useful
   to get slightly better performance in multiprocessor benchmarks. It also
   makes some profiling using performance counters more accurate.
+  Please note that on systems with MONITOR/MWAIT support (like Intel EM64T
+  CPUs) this option has no performance advantage over the normal idle loop.
+  It may also interact badly with hyperthreading.
 
 Rebooting
 
    reboot=b[ios] | t[riple] | k[bd] [, [w]arm | [c]old]
    bios	  Use the CPU reboto vector for warm reset
    warm   Don't set the cold reboot flag
-   cold   Set the cold reboto flag
+   cold   Set the cold reboot flag
    triple Force a triple fault (init)
    kbd    Use the keyboard controller. cold reset (default)
 
@@ -83,6 +120,11 @@ Rebooting
    Disadvantage is that not all hardware will be completely reinitialized
    on reboot so there may be boot problems on some systems.
 
+   reboot=force
+
+   Don't stop other CPUs on reboot. This can make reboot more reliable
+   in some cases.
+
 Non Executable Mappings
 
   noexec=on|off
@@ -98,10 +140,16 @@ SMP
 
   cpumask=MASK   only use cpus with bits set in mask
 
+  additional_cpus=NUM Allow NUM more CPUs for hotplug
+		 (defaults are specified by the BIOS, see Documentation/x86_64/cpu-hotplug-spec)
+
 NUMA
 
   numa=off	Only set up a single NUMA node spanning all memory.
 
+  numa=noacpi   Don't parse the SRAT table for NUMA setup
+
+  numa=fake=X   Fake X nodes and ignore NUMA setup of the actual machine.
 
 ACPI
 
@@ -110,6 +158,12 @@ ACPI
 		interpreter
   acpi=force	Force ACPI on (currently not needed)
 
+  acpi=strict   Disable out of spec ACPI workarounds.
+
+  acpi_sci={edge,level,high,low}  Set up ACPI SCI interrupt.
+
+  acpi=noirq	Don't route interrupts
+
 PCI
 
   pci=off	Don't use PCI
@@ -119,6 +173,7 @@ PCI
   pci=assign-busses    Assign busses
   pci=irqmask=MASK	       Set PCI interrupt mask to MASK
   pci=lastbus=NUMBER	       Scan upto NUMBER busses, no matter what the mptable says.
+  pci=noacpi		Don't use ACPI to set up PCI interrupt routing.
 
 IOMMU
 
@@ -144,3 +199,21 @@ IOMMU
 
   pages  Prereserve that many 128K pages for the software IO bounce buffering.
   force  Force all IO through the software TLB.
+
+Debugging
+
+  oops=panic Always panic on oopses. Default is to just kill the process,
+	     but there is a small probability of deadlocking the machine.
+	     This will also cause panics on machine check exceptions.
+	     Useful together with panic=30 to trigger a reboot.
+
+  kstack=N   Print that many words from the kernel stack in oops dumps.
+
+  pagefaulttrace Dump all page faults. Only useful for extreme debugging
+		and will create a lot of output.
+
+Misc
+
+  noreplacement  Don't replace instructions with more appropriate ones
+		 for the CPU. This may be useful on asymmetric MP systems
+		 where some CPU have less capabilities than the others.