Commit:     9ad65e4748f55e3159283d7fa9d54fb30c086113
Parent:     de18c850af701ac9512b7239e88fa45e4c168771
Author:     Huang, Ying <[EMAIL PROTECTED]>
AuthorDate: Wed Jan 30 13:31:19 2008 +0100
Committer:  Ingo Molnar <[EMAIL PROTECTED]>
CommitDate: Wed Jan 30 13:31:19 2008 +0100

    x86: EFI runtime service support: document for EFI runtime services
    This patch adds document for EFI x86_64 runtime services support.
    Signed-off-by: Chandramouli Narayanan <[EMAIL PROTECTED]>
    Signed-off-by: Huang Ying <[EMAIL PROTECTED]>
    Cc: Andi Kleen <[EMAIL PROTECTED]>
    Signed-off-by: Andrew Morton <[EMAIL PROTECTED]>
    Signed-off-by: Ingo Molnar <[EMAIL PROTECTED]>
    Signed-off-by: Thomas Gleixner <[EMAIL PROTECTED]>
 Documentation/x86_64/boot-options.txt |    9 ++++++++-
 Documentation/x86_64/uefi.txt         |    9 +++++++++
 2 files changed, 17 insertions(+), 1 deletions(-)

diff --git a/Documentation/x86_64/boot-options.txt 
index d7a3332..638bf46 100644
--- a/Documentation/x86_64/boot-options.txt
+++ b/Documentation/x86_64/boot-options.txt
@@ -110,7 +110,7 @@ Idle loop
-   reboot=b[ios] | t[riple] | k[bd] | a[cpi] [, [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
@@ -119,6 +119,9 @@ Rebooting
    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.
@@ -303,4 +306,8 @@ Debugging
                newfallback: use new unwinder but fall back to old if it gets
                        stuck (default)
+  noefi                Disable EFI support
diff --git a/Documentation/x86_64/uefi.txt b/Documentation/x86_64/uefi.txt
index 91a98ed..7d77120 100644
--- a/Documentation/x86_64/uefi.txt
+++ b/Documentation/x86_64/uefi.txt
@@ -19,6 +19,10 @@ Mechanics:
 - Build the kernel with the following configuration.
+  If EFI runtime services are expected, the following configuration should
+  be selected.
+       CONFIG_EFI=y
+       CONFIG_EFI_VARS=y or m          # optional
 - Create a VFAT partition on the disk
 - Copy the following to the VFAT partition:
        elilo bootloader with x86_64 support, elilo configuration file,
@@ -27,3 +31,8 @@ Mechanics:
        can be found in the elilo sourceforge project.
 - Boot to EFI shell and invoke elilo choosing the kernel image built
   in first step.
+- If some or all EFI runtime services don't work, you can try following
+  kernel command line parameters to turn off some or all EFI runtime
+  services.
+       noefi           turn off all EFI runtime services
+       reboot_type=k   turn off EFI reboot runtime service
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