grub_platforms options

coreboot
Coreboot platform support
efi-32
EFI 32 bit platform support (Old MACs)
efi-64
EFI 64 bit platform support
emu
Emulation platform support
ieee1275
IEEE1275 platform support
loongson
MIPS loongson platform support
multiboot
Multiboot platform support
pc
PC platform support
qemu
QEMU platform support
qemu-mips
QEMU MIPS platform support
uboot
U-Boot platform support
xen
XEN (pvgrub2) platform support
xen-32
Build 32-bit XEN (pvgrub2) platform support on amd64