Porting U-Boot's UEFI Payload to coreboot

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?

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/

Please help me understand the structure.

Best regards, Husni.