Follow-up Comment #3, bug #36077 (project grub): Your memory map is very weird: the whole of real mode memory is occupied by boot services data. Such memory according to specification can be overwritten without any problem and GRUB previously followed it but it was discovered that some EFI implementations improperly declare runtime services memory as boot services so we've changed to not overwriting them. But Linux can't be loaded without real mode memory, attached patch overwrites boot services memory if it doesn't find anythong better
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