A while ago (around the freeze of FC29) grub2-efi on top of Uboot was proposed as the (potentially) default setup for armhfp too. Unfortunately (IMHO) it did not materialize and I'm searching for the game-breaker.
On buggzilla found a few hints, " we have at least a grub2 <-> kernel bug" (1) among them, they did not make the holdup clear to me.
My investigation so-far:
* It works pretty good with a close to upstream build grub, not with the default gub2 packages. Which makes me believe loading an arm32 kernel as an Portable Executable instead of grub's LoadImage() and StartImage() services may be a game-stopper. NOTE : I understand this is necessary for chain loading efi stubs for secure-boot. IMO this is not the pursued goal here.
* Since kernel patch "efi: libstub/arm: account for firmware reserved memory at the base of RAM" (2) it works on RPI's too (given a "custom" build grub2)
All feedback is appreciated,