Andrei Borzenkov writes:
Create ESP partition (with correct GUID) and format it as FAT; mount it as /boot/efi run "grub2-install --target=x86_64-efi"; it will return an error that it could not update firmware settings. Verify that /boot/efi/EFI/opensuse/grubx64.efi is present; if not, manually copy /boot/grub2/x86_64-efi/core.img as this file
Thanks for the answer, but... Way over my head, this would be my first UEFI install. The install system is empty, so I need to partition the disk. GPT is the order, how do I tell the non-UEFI booted installer to create a GPT? Then I need an EFI partition, how big should these by, BTW? The rest of the disk is something the installer should take care of, I hope.
Disable secure boot. On reboot you will need to manually select file to boot in your firmware menu (grubx64.efi on ESP). If this is not possible - find EFI shell; put it on USB stick as \EFI\BOOT\BOOTX64.EFI and try to boot from USB stick. If it is successful, you are in shell environment where you can manually load grub.
The BIOS seems good enough to find UEFI bootables.
If booting will be successful, you will need to go into yast and reconfigure bootloader. I advice first setting "no bootloader" and save. The select correct one. Changing bootloader on the fly never worked correctly in the past.
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