Warning W228 - The CPU has not been validated for MP (multi-processor) usage, like running in this MP system. While it may work in MP mode, it may not support certain functions required for proper MP operation or have different timings or voltage requirements. MP CPUs need to pass more stringent tests, thus a CPU not validated for MP usage may fail in boundary cases.
Fix: Double-check if this is a MP certified CPU, if not attempt to swap it for a MP certified one.
For more information, please see the (FAQ).