efi_handle_dump [a-b-c-d0d1-d3d4d5d6d7] or [a b c d0 d1 d2 d3 d4 d5 d6 d7]
Dump all the efi handle with protocol and devpath
3.10.6. dfu - device firmware update
3.10.8. efiexit - Leave barebox and return to the calling EFI process