- From https://github.com/edk2-porting/edk2-rk3588/releases/tag/v0.9.1
- For example, for `rock-5b_UEFI_Release_v0.9.1.img`
- `UEFI_EDK2_BOARD_ID` is `rock-5b`
- **Important**: this has no effect unless optional extension is enabled
- to test this out:
- make sure to read carefully the instructions at https://github.com/edk2-porting/edk2-rk3588/blob/master/README.md
- suppose you previously built the regular u-boot version with:
- `./compile.sh BOARD=rock-5b BRANCH=legacy RELEASE=jammy`
- now you can build the UEFI version with:
- `./compile.sh BOARD=rock-5b BRANCH=legacy RELEASE=jammy EXT=uefi-edk2-rk3588`
- write the produced image to SD or eMMC and boot it
- use normally, or enter "UMS" mode by selecting that option in the grub menu
- You can write image to eMMC, boot it, enter UMS, write it again to NVMe, reboot, press <ESC> in UEFI and boot from NVMe
- Also works if .img is written to eg USB stick, and UEFI edk2 is separately deployed to SPI flash
- **Important**: make _absolutely_ sure you are able to force Maskrom mode (by shorting pins, pressing buttons, etc) before writing an UEFI image to eMMC; UEFI has no RockUSB ("Loader mode" support) at all. The new "initramfs-usb-gadget-ums" extension hopes to address this, but it is not guaranteed to work.
