Since technically GRUB is requesting the initrd file, I tried to rule it out as a possible cause by seeing if the initial payload that UEFI downloads directly would time out if it was the same size. I did this by padding my grubnetaa64.efi binary to be the same size as the installer initrd.
Since technically GRUB is requesting the initrd file, I tried to rule it out as a possible cause by seeing if the initial payload that UEFI downloads directly would time out if it was the same size. I did this by padding my grubnetaa64.efi binary to be the same size as the installer initrd.
mv grubnetaa64.efi grubnetaa64. efi.orig efi.orig of=grubnetaa64 conv=notrunc
cp casper/initrd grubnetaa64.efi
dd if=grubnetaa64.
This did *not* timeout. So unfortunately we can't obviously rule out GRUB as a factor.