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The first 48 bytes contain the microcode update header. DataSize must be a multiple of DWORDs. TotalSize is always a multiple of 1024. Both size of CPU_MICROCODE_EXTENDED_TABLE_HEADER and CPU_MICROCODE_EXTENDED_TABLE are multiple of DWORDs. So (ExtendedTableLength & 0x3)!=0 should be (ExtendedTableLength & 0x3)==0. Cc: Jiewen Yao <jiewen.yao@intel.com> Cc: Rangasai V Chaganty <rangasai.v.chaganty@intel.com> Contributed-under: TianoCore Contribution Agreement 1.1 Signed-off-by: Star Zeng <star.zeng@intel.com> Reviewed-by: Jiewen Yao <jiewen.yao@intel.com> Reviewed-by: Rangasai V Chaganty <rangasai.v.chaganty@intel.com>