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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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200001eb14
Applies on top of the previous patch:
x86 boot: add code to add BIOS provided EFI memory entries to kernel
Instead of always adding EFI memory map entries (if present) to the
memory map after initially finding either E820 BIOS memory map entries
and/or kernel command line memmap entries, -instead- only add such
additional EFI memory map entries if the kernel boot option:
add_efi_memmap
is specified.
Requiring this 'add_efi_memmap' option is backward compatible with
kernels that didn't load such additional EFI memory map entries in
the first place, and it doesn't override a configuration that tries
to replace all E820 or EFI BIOS memory map entries with ones given
entirely on the kernel command line.
Signed-off-by: Paul Jackson <pj@sgi.com>
Cc: "Yinghai Lu" <yhlu.kernel@gmail.com>
Cc: "Jack Steiner" <steiner@sgi.com>
Cc: "Mike Travis" <travis@sgi.com>
Cc: "Huang
Cc: Ying" <ying.huang@intel.com>
Cc: "Andi Kleen" <andi@firstfloor.org>
Cc: "Andrew Morton" <akpm@linux-foundation.org>
Cc: Paul Jackson <pj@sgi.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
43 lines
1.7 KiB
Plaintext
43 lines
1.7 KiB
Plaintext
General note on [U]EFI x86_64 support
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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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- If the EFI memory map has additional entries not in the E820 map,
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you can include those entries in the kernels memory map of available
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physical RAM by using the following kernel command line parameter.
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add_efi_memmap include EFI memory map of available physical RAM
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