grub2.02 can boot the linux kernel with 64-bit boot protocol

Hi All, I use the grub2.02 to boot the 64-bit kernel of Kernel 3.16.0. The grub2.02 use the 32-bit boot protocol and the grub is also 32-bit. But I see that grub can use the 64-bit boot protocol in the Documents/x86/boot.txt. So I want to know how to realize

Can the grub2.02 improve the limit of initrd size in 64-bit system?

Hi All, environment : X86-64 , kernel 3.16.0(64-bit support),grub2.02 I compile the grub2.02 by default. And the grub boots the linux kernel with 32-bit boot protocol.(Documents/X86/boot.txt) I want to use the initrd as big as possible, but it is limited as follows. But when I make a