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To enable GPU passthru, BAR2 allocation had problems when the allocation is above the 4GB memory.This change is to accomodate the 256MB aperture allocation in BAR2 to a more managable address. v2: changed the MEMBASE64 address instead of increasing the mem_size. Signed-off-by: Anitha Chrisanthus <anitha.chrisanthus@intel.com> Reviewed-by: Gong Zhipeng <zhipeng.gong@intel.com>