UEFI grub + wimboot

[robinsmidsrod]

Wimboot is not tested with grub, so it's unknown whether it would actually work or not, much less in UEFI mode. Try getting it to work directly with iPXE in EFI mode first, and if that is confirmed to work then you can try to get it to work with EFI grub. Also remember that the initrd stanzas used with wimboot load files into ramdisk and wrap them as cpio archives. It's highly likely that grub doesn't do this (which ipxe does). See http://ipxe.org/cmd/initrd for more details.