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58 lines
1.8 KiB
58 lines
1.8 KiB
.. SPDX-License-Identifier: GPL-2.0 |
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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 |
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turn off all EFI runtime services |
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reboot_type=k |
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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 |
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include EFI memory map of available physical RAM
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