wimboot using grub2 on EFI

[sherpya]

Hi,
I'm an happy user of wimboot from grub2 on my usb stick, I can start windows 10 setup, dart even with files withing an iso file.
Unfortunately I'm unable to make it work in efi:

• load16 does not work (looks like it does not execute any code at all)
• chainloading snponly.efi stops when I call boot with "no such device" (in efi_image.c)
• chainloading wimboot will map each file at the root of the usb stick, the same result of chainloading bootmgr.efi, so I have no advantages over it
• loadefi says wimboot has invalid signature
  

Right now I'm using qemu with OVMF

If you need additional info just let me known