I used the Plasma RPI4 image, made with manjaro-arm-installer and booted it to finished the installation. I then built the kernel with RHEL8 that came with it to save time, and copied that over. Then booted on the rpi4 and installed grub with –removable, then built a new initramfs and ran grub-mkconfig. Finally, moved the drive to the server, and it booted right up.
Edit: I did make a couple of small modifications to manjaro-arm-installer, to make a gpt partition table rather than mbr for the “rpi4” and the boot partition to be formatted as fat32. I also used gparted to re-flag the partition as esp+boot.
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