-ifclass -o CENTOS SLC && exit 0
-if ifclass -o I386 AMD64 ; then
- ifclass -o GRUB_PC GRUB_EFI ||echo GRUB_PC
+ifclass -o GRUB_PC GRUB_EFI && exit 0
+
+if [ -d /sys/firmware/efi ]; then
+ echo GRUB_EFI
+elif ifclass -o I386 AMD64 ; then
+ echo GRUB_PC