x86_64 EFI runtime service support: document for EFI runtime services
PATCH 3/4 x86_64 EFI runtime service support: document for EFI runtime services
This patch adds document for EFI x86_64 runtime services support.
---
boot-options.txt | 11 ++++++++++- uefi.txt | 9 +++++++++ 2 files changed, 19 insertions(+), 1 deletion(-)
Signed-off-by Chandramouli Narayanan <[email protected]>
Signed-off-by Huang Ying <[email protected]>
Documentation/x86_64/boot-options.txt +10 -1
@@ -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 +303,10 @@ newfallback: use new unwinder but fall back to old if it gets stuck (default) +EFI + + noefi Disable EFI support + + efi_time=on Enable EFI time runtime service + Miscellaneous
Documentation/x86_64/uefi.txt +9 -0
@@ -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 +31,8 @@ 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