path: root/Documentation
diff options
authorHuang, Ying <ying.huang@intel.com>2008-01-30 13:31:19 +0100
committerIngo Molnar <mingo@elte.hu>2008-01-30 13:31:19 +0100
commit9ad65e4748f55e3159283d7fa9d54fb30c086113 (patch)
treec562b13be18497327cc772d52739cddcf369845d /Documentation
parentde18c850af701ac9512b7239e88fa45e4c168771 (diff)
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 <mouli@linux.intel.com> Signed-off-by: Huang Ying <ying.huang@intel.com> Cc: Andi Kleen <ak@suse.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'Documentation')
2 files changed, 17 insertions, 1 deletions
diff --git a/Documentation/x86_64/boot-options.txt b/Documentation/x86_64/boot-options.txt
index d7a33325868..638bf46ca05 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 91a98edfb58..7d77120a518 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_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