EFI System and /boot are often the same partition, but they don't have to be, GRUB can boot a kernel and initramfs off most common linux filesystems (and less c

EFI System and /boot are often the same partition, but they don't have to be, GRUB can boot a kernel and initramfs off most common linux filesystems (and less common ones like xfs, hfs and reiser), it can even decrypt a LUKS partition.