if ! search --file --set root /Part-__DISK__-__PART__; then
    search --file --set root /EFI/Part-__DISK__-__PART__/Boot/ogloader.efi
fi
search --file --set rootEFI /EFI/Part-__DISK__-__PART__/Boot/ogloader.efi
chainloader ($rootEFI)/EFI/Part-__DISK__-__PART__/Boot/ogloader.efi
boot