On 3/8/22 13:59, Ahamed Husni wrote:
Hi everyone,
I am trying to work on a project to port the U-Boot UEFI code to coreboot
as a payload.
I haven't worked with UEFI before except running a basic EFI payload in a
coreboot/u-boot environment. (Serial output:
https://gist.github.com/drac98/6166d29f6c3a2baf2f4e791925ea98d3)
I would like to know how UEFI is implemented in U-Boot. Is UEFI integrated
into u-boot or is it implemented like a payload?
Hello Ahamed,
the UEFI API implementation is an integral part of U-Boot.
Where is the UEFI source code? Is it the following files in the tree
https://source.denx.de/u-boot/custodians/u-boot-efi
lib/
|__ efi/
|__ efi_driver/
|__ efi_loader/
U-Boot can both be run on top of UEFI. This is the code you find in
/lib/efi/. Furthermore UEFI can run as a firmware providing the UEFI
API. This is what you find in /lib/efi_loader/ and /lib/efi_driver/.
You can build U-Boot as payload for coreboot which offers the UEFI API
implementation. See configs/coreboot64_defconfig.
U-Boot runs ARM and RISC-V Linux successfully via UEFI.
What architecture are you looking at?
Simon (on CC) has been working on U-Boot on UEFI and Coreboot while I
have concentrated on the UEFI API implementation in U-Boot.
Best regards
Heinrich
Please help me understand the structure.
Best regards,
Husni.
