I´ve just compilled uefi edk/edk2 duet (both) booted up my linux drive and it seems the 4gb ram "bug" is there too, so it's not related to iboot..

edit:

i´ve just found if i use acpipatcher.efi in modules and i add a couple of fake .aml tables the bug is gone, lol dirty but it works





btw: very nice work guys, congrats , sorry if i didnt say it in my previous post