From Adélie Linux

GRUB 2 is a bootloader for multiple architectures. It can be useful on x86_64 machines where elilo and syslinux fail to boot in UEFI mode.


Ensure you are chrooted correctly into /target before continuing.

Mount your bootstrap partition (HFS formatted, if on Macintosh) at /boot/grub. Run grub-mkconfig to create a configuration file suitable for your system, then run grub-install /boot/grub. Ignore any errors about PReP partitions. Then use grub-macbless /boot/grub/grub to bless the partition correctly, allowing it to be chosen for boot. You then need to install a suitable ofboot.b file; simply curl -o /boot/grub/ofboot.b to ensure this file is installed properly. This should allow you to boot from the disk.