MSI PRO B850-P coreboot port: PCIe and USB descriptors and Phoenix OpenSIL

Published at March 6, 2026 · Michał Żygowski ·  17 min read

Continuing the journey of porting MSI PRO B850-P to coreboot. This post covers the port configuration phase: USB and PCIe MPIO descriptors derived from hardware topology discovery. It also describes the integration of Phoenix OpenSIL as a Proof of Concept and the challenges encountered compared to the Genoa and Turin platforms....

Categories: firmware