Merge branch 'from-tomtucker' into for-2.6.26

[safe/jmp/linux-2.6] / Documentation / x86_64 / boot-options.txt

diff --git a/Documentation/x86_64/boot-options.txt b/Documentation/x86_64/boot-options.txt
index 7500aad..b0c7b6c 100644 (file)
--- a/Documentation/x86_64/boot-options.txt
+++ b/Documentation/x86_64/boot-options.txt
@@ -14,9 +14,11 @@ Machine check
    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
+               0: always panic on uncorrected errors, log corrected errors
+               1: panic or SIGBUS on uncorrected errors, log corrected errors
+               2: SIGBUS or log uncorrected errors, log corrected errors
+               3: never panic or SIGBUS, log all errors (for testing only)
+               Default is 1
                Can be also set using sysfs which is preferable.
 
    nomce (for compatibility with i386): same as mce=off
@@ -108,12 +110,18 @@ Idle loop
 
 Rebooting
 
-   reboot=b[ios] | t[riple] | k[bd] [, [w]arm | [c]old]
+   reboot=b[ios] | t[riple] | k[bd] | a[cpi] | e[fi] [, [w]arm | [c]old]
    bios          Use the CPU reboot vector for warm reset
    warm   Don't set the cold reboot flag
    cold   Set the cold reboot flag
    triple Force a triple fault (init)
    kbd    Use the keyboard controller. cold reset (default)
+   acpi   Use the ACPI RESET_REG in the FADT. If ACPI is not configured or the
+          ACPI reset does not work, the reboot path attempts the reset using
+          the keyboard controller.
+   efi    Use efi reset_system runtime service. If EFI is not configured or the
+          EFI reset does not work, the reboot path attempts the reset using
+          the keyboard controller.
 
    Using warm reset will be much faster especially on big memory
    systems because the BIOS will not go through the memory check.
@@ -134,12 +142,6 @@ Non Executable Mappings
 
 SMP
 
-  nosmp        Only use a single CPU
-
-  maxcpus=NUMBER only use upto NUMBER CPUs
-
-  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)
 
@@ -153,9 +155,15 @@ NUMA
                If a number, fakes CMDLINE nodes and ignores NUMA setup of the
                actual machine.  Otherwise, system memory is configured
                depending on the sizes and coefficients listed.  For example:
-                       numa=fake=2*512,1024,4*256
-               gives two 512M nodes, a 1024M node, and four 256M nodes.  The
-               remaining system RAM is allocated to an additional node.
+                       numa=fake=2*512,1024,4*256,*128
+               gives two 512M nodes, a 1024M node, four 256M nodes, and the
+               rest split into 128M chunks.  If the last character of CMDLINE
+               is a *, the remaining memory is divided up equally among its
+               coefficient:
+                       numa=fake=2*512,2*
+               gives two 512M nodes and the rest split into two nodes.
+               Otherwise, the remaining system RAM is allocated to an
+               additional node.
 
   numa=hotadd=percent
                Only allow hotadd memory to preallocate page structures upto
@@ -299,3 +307,8 @@ Debugging
                        stuck (default)
 
 Miscellaneous
+
+       nogbpages
+               Do not use GB pages for kernel direct mappings.
+       gbpages
+               Use GB pages for kernel direct mappings.