On 8/30/21 12:20 AM, Hans de Goede wrote:
For the grub bit I think you just need a menu entry with a
chainloader
line in there, similar to how booting Windows in a multi-boot setup works.
Among other things, I've tried
insmod chain
chainloader /<path>/pcmemtest.efi
When that menuentry is selected, GRUB2 will immediately return to its
list. I've never dual-booted Windows on a UEFI system, so I don't know
if there's more to it than that.