grub2 support for x86_64 and aarch64
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xCAT 2.17 enables grub2 boot support for x86_64 and aarch64 but does not ship the necessary grub2 binaries for both architectures.
If you want to use grub2 for x86_64 or aarch64 you need to download the binaries from some EL OS repository.

#. Download files from an BaseOS EL repository mirror

        For EL these files are named ``grubx64.efi`` (x86_64) and ``grubaa64.efi`` (aarch64) and usually in ``BaseOS/<arch>/os/EFI/BOOT``.
        For very recent hardware you might need to use a newer grub version. Therefore, it's recommended to use a binary from the latest operationg system release available.
        You can use Red Hat Enterprise Linux, AlmaLinux, Rocky Linux or even Fedora repositories to download the grub files.

#. Copy downloaded files to ``/tftpboot/boot/grub2``:

        * x86_64: ``/tftpboot/boot/grub2/grub2.aarch64``
        * aarch64: ``/tftpboot/boot/grub2/grub2.x86_64``