@rose Seems like stem works on riscv64 (with u-boot 2025.01), where poking around made me land again in u-boot's eficonfig which spawns a menu allowing to set kernel/initrd/…
One thing to watch out is unlike how it behave with extlinux.conf u-boot doesn't seems to override the default bootargs with what's in the EFI section, so you need to setenv -f bootargs before using load + bootefi
btw I think it would make sense for stem to point to graft-kernel and vice-versa.
@rose Haven't tried rootloader yet, in fact I wonder how does it works filesystem support wise? (As the /boot I made is ext4, didn't plan for EFI at all with that board)