optools/sys/BootSync/prep.txt

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PREPARATION:
0.) Comment out all /boot mounts in /etc/fstab and umount /boot if mounted as a separate mountpoint.
You want to use *the /boot on your / mount*.
1.) Prepare each target partition (partitions/part below) as an ESP
(https://wiki.archlinux.org/index.php/EFI_system_partition#Format_the_partition).
2.) Install GRUB2 to *each ESP*. See sample.config.xml for context for the below examples.
grub-install \
--boot-directory=/mnt/boot1 \
--bootloader-id=Arch \
--efi-directory=/mnt/boot1/ \
--target=x86_64-efi \
--no-nvram \
--recheck
grub-install \
--boot-directory=/mnt/boot1 \
--bootloader-id="Arch (Fallback)" \
--efi-directory=/mnt/boot1/ \
--target=x86_64-efi \
--no-nvram \
--recheck
grub-install \
--boot-directory=/mnt/boot2 \
--bootloader-id=Arch \
--efi-directory=/mnt/boot2/ \
--target=x86_64-efi \
--no-nvram \
--recheck
grub-install \
--boot-directory=/mnt/boot2 \
--bootloader-id="Arch (Fallback)" \
--efi-directory=/mnt/boot2/ \
--target=x86_64-efi \
--no-nvram \
--recheck
3.) Prepare the ESPs. See sample.config.xml for context for the below examples.
efibootmgr \
--create \
--disk /dev/sdd \
--part 1 \
--loader /EFI/Arch/grubx64.efi \
--label "Arch (Fallback)"
efibootmgr \
--create \
--disk /dev/sdb \
--part 1 \
--loader /EFI/Arch/grubx64.efi \
--label "Arch"