From PI spec vol2: Prior to invoking any UEFI drivers, applications, or connecting consoles, the platform should signal the event EFI_END_OF_DXE_EVENT_GUID Contributed-under: TianoCore Contribution Agreement 1.0 Signed-off-by: Cinnamon Shia <cinnamon.shia@hpe.com> Reviewed-by: Ruiyu Ni <ruiyu.ni@intel.com>