Chainloading grub2 pxe efi file

[NiKiZe]

I think your issue could be solved by enabling the "EFI downgrade" option see the commit at http://git.ipxe.org/ipxe.git/commitdiff/a15c0d7

If that solves your issue you might want to contact the Grub people and try to get them to make a fix on their end.

But there is no need to use Grub since you can have both menu and loading of kernel directly from ipxe, grub does not give any benefit IMHO