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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>
39 lines
1.4 KiB
Plaintext
39 lines
1.4 KiB
Plaintext
General note on [U]EFI x86_64 support
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-------------------------------------
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The nomenclature EFI and UEFI are used interchangeably in this document.
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Although the tools below are _not_ needed for building the kernel,
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the needed bootloader support and associated tools for x86_64 platforms
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with EFI firmware and specifications are listed below.
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1. UEFI specification: http://www.uefi.org
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2. Booting Linux kernel on UEFI x86_64 platform requires bootloader
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support. Elilo with x86_64 support can be used.
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3. x86_64 platform with EFI/UEFI firmware.
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Mechanics:
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---------
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- Build the kernel with the following configuration.
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CONFIG_FB_EFI=y
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CONFIG_FRAMEBUFFER_CONSOLE=y
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If EFI runtime services are expected, the following configuration should
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be selected.
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CONFIG_EFI=y
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CONFIG_EFI_VARS=y or m # optional
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- Create a VFAT partition on the disk
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- Copy the following to the VFAT partition:
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elilo bootloader with x86_64 support, elilo configuration file,
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kernel image built in first step and corresponding
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initrd. Instructions on building elilo and its dependencies
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can be found in the elilo sourceforge project.
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- Boot to EFI shell and invoke elilo choosing the kernel image built
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in first step.
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- If some or all EFI runtime services don't work, you can try following
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kernel command line parameters to turn off some or all EFI runtime
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services.
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noefi turn off all EFI runtime services
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reboot_type=k turn off EFI reboot runtime service
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