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system76-firmware-open/docs/uefi.md
Tim Crawford 8c88ca0252 docs: Add notes about UEFI features 
Document that only UEFI booting is supported, the current status of
Secure Boot, and that the shell and networking are disabled.

Signed-off-by: Tim Crawford <tcrawford@system76.com>
2021-12-21 13:11:09 -07:00

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UEFI

System76 uses EDK2 to implement UEFI.

coreboot is used for Platform Initialization (PI).

Booting

System76 Open Firmware only supports UEFI booting. Legacy BIOS-MBR booting is not supported. \EFI\BOOT\BOOTX64.EFI must exist on the EFI System Partition to be considered valid.

Network functionality is disabled. Native PXE booting is not supported.

Secure Boot

Secure Boot support is currently disabled.

The implementation from 9elements is in development. If building a custom image, the edk2 config SECURE_BOOT_ENABLE can be set to enable support.

There is currently no firmware UI to view or configure Secure Boot.

Shell

The internal UEFI shell is disabled. A separate binary on a bootable drive must be used to access the shell environment.