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If IOMMU is enabled, the legacy BIOS need allow the legacy memory access by the legacy device. The legacy memory is below 1M memory and HighPmm memory. Cc: Star Zeng <star.zeng@intel.com> Contributed-under: TianoCore Contribution Agreement 1.1 Signed-off-by: Jiewen Yao <jiewen.yao@intel.com> Reviewed-by: Star Zeng <star.zeng@intel.com>