Specify little-endian, and then use the “Standard size” from the chart. 

Enhance python tool.
The default being native size (and alignment) means by default the standard sizes are not used, which might cause different behavior on difference compiler.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: "Yao, Jiewen" <jiewen.yao@intel.com>
Reviewed-by: "Andrew Fish" <afish@apple.com>


git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@16476 6f19259b-4bc3-4df7-8a09-765794883524
diff --git a/IntelFspPkg/Tools/GenCfgOpt.py b/IntelFspPkg/Tools/GenCfgOpt.py
index 78b330a..555099b 100644
--- a/IntelFspPkg/Tools/GenCfgOpt.py
+++ b/IntelFspPkg/Tools/GenCfgOpt.py
@@ -614,8 +614,8 @@
 

                 BinFd = open(BinFile, "rb")

                 IdStr    = BinFd.read(0x08)

-                ImageId  = struct.unpack('Q', IdStr)

-                ImageRev = struct.unpack('I', BinFd.read(0x04))

+                ImageId  = struct.unpack('<Q', IdStr)

+                ImageRev = struct.unpack('<I', BinFd.read(0x04))

                 BinFd.close()

 

                 HeaderFd.write("#define VPD_IMAGE_ID    0x%016X        /* '%s' */\n" % (ImageId[0], IdStr))