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SMRR range size and alignment should follow the rules like MTRR: a. The minimum range size is 4 KBytes and the base address of the range must be on at least a 4-KByte boundary. b. For ranges greater than 4 KBytes, each range must be of length 2^n and its base address must be aligned on a 2^n boundary, where n is a value equal to or greater than 12. The base-address alignment value cannot be less than its length. Thus, it could meet "Address_Within_Range AND PhysMask = PhysBase AND PhysMask". Cc: Jeff Fan <jeff.fan@intel.com> Cc: Jiewen Yao <jiewen.yao@intel.com> Cc: Feng Tian <feng.tian@intel.com> Contributed-under: TianoCore Contribution Agreement 1.0 Signed-off-by: Michael Kinney <michael.d.kinney@intel.com> Reviewed-by: Jeff Fan <jeff.fan@intel.com> Reviewed-by: Jiewen Yao <jiewen.yao@intel.com> Acked-by: Laszlo Ersek <lersek@redhat.com>