GNU GRUB is a multiboot boot loader.  It was derived from GRUB, the GRand
Unified Bootloader, which was originally designed and implemented by Erich
Stefan Boleyn.

This port builds the GRUB x86_64-efi boot modules, allowing grub-install
or grub-mkrescue to install with EFI support.

WWW: http://www.gnu.org/software/grub/