This seems like a legitimate configuration. I don’t know that it should be considered an error. A warning, maybe. This is also what the build report is perfect for finding. Did you check the PCD build report when debugging? - Bret From: Lin, Derek (HPS SW) via groups.io Sent: Sunday, April 5, 2020 7:55 PM To: devel@edk2.groups.io Subject: [EXTERNAL] [edk2-devel] Basetools fail without error message due to PCD type differs in architecture. We've found a Basetool issue. When a PCD is FixAtBuild at IA32 and Dynamic is at X64, there is no error message in this situation and it's very difficult to find the root cause. Here's example to see the issue: https://github.com/howdou/edk2/commit/333c5f33adc652308355ec100f7f385d552392fa I think it is not allowed to have FixAtBuild at IA32 and Dynamic at X64. BaseTool should have an error message for this.