Commit 9ad65e47 authored by Huang, Ying's avatar Huang, Ying Committed by Ingo Molnar
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x86: EFI runtime service support: document for EFI runtime services

This patch adds document for EFI x86_64 runtime services support.
Signed-off-by: default avatarChandramouli Narayanan <>
Signed-off-by: default avatarHuang Ying <>
Cc: Andi Kleen <>
Signed-off-by: default avatarAndrew Morton <>
Signed-off-by: default avatarIngo Molnar <>
Signed-off-by: default avatarThomas Gleixner <>
parent de18c850
......@@ -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
......@@ -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
noefi turn off all EFI runtime services
reboot_type=k turn off EFI reboot runtime service
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