Worked on the microsoft/mu_plus repository to enhance platform safety and cross-compatibility for hardware port I/O by developing a runtime gating feature flag for hardware port writes. This feature, implemented in C for embedded systems and firmware development, introduced a new PCD to control runtime behavior, ensuring that boot-time serial output is preserved while allowing safe OS-runtime operation on platforms where serial calls after ExitBootServices are unsafe. The approach maintained default behavior for existing platforms, enabled targeted support without breaking changes, and provided clear documentation for integration, laying the foundation for more robust OS runtime logging across architectures like ARM64.