This patch adds document for EFI x86_64 runtime services support.
---
boot-options.txt | 12 +++++++++++-
uefi.txt | 10 ++++++++++
2 files changed, 21 insertions(+), 1 deletion(-)
Signed-off-by: Chandramouli Narayanan <[email protected]>
Signed-off-by: Huang Ying <[email protected]>
Index: linux-2.6.24-rc1/Documentation/x86_64/boot-options.txt
===================================================================
--- linux-2.6.24-rc1.orig/Documentation/x86_64/boot-options.txt 2007-10-25 13:58:14.000000000 +0800
+++ linux-2.6.24-rc1/Documentation/x86_64/boot-options.txt 2007-10-25 13:58:18.000000000 +0800
@@ -110,12 +110,15 @@
Rebooting
- reboot=b[ios] | t[riple] | k[bd] [, [w]arm | [c]old]
+ reboot=b[ios] | t[riple] | k[bd] | 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)
+ 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.
@@ -300,4 +303,11 @@
newfallback: use new unwinder but fall back to old if it gets
stuck (default)
+EFI
+
+ noefi Disable EFI support
+
+ noefi_time Disable EFI time runtime service, programming CMOS
+ hardware directly
+
Miscellaneous
Index: linux-2.6.24-rc1/Documentation/x86_64/uefi.txt
===================================================================
--- linux-2.6.24-rc1.orig/Documentation/x86_64/uefi.txt 2007-10-25 13:58:18.000000000 +0800
+++ linux-2.6.24-rc1/Documentation/x86_64/uefi.txt 2007-10-25 13:58:18.000000000 +0800
@@ -19,6 +19,10 @@
- Build the kernel with the following configuration.
CONFIG_FB_EFI=y
CONFIG_FRAMEBUFFER_CONSOLE=y
+ 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 +31,9 @@
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
+ noefi_time turn off EFI time runtime service
+ reboot_type=k turn off EFI reboot runtime service
-
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