AMD’s push to modernize its firmware stack with OpenSIL—an open-source alternative to the aging AGESA—has taken a significant step forward, with experimental support now extending to consumer AM5 platforms. While still in a proof-of-concept phase, the milestone marks progress toward broader adoption beyond server-grade EPYC processors like the 9005-series Turin.
The latest breakthrough comes from 3mdeb, a Polish open-source consulting firm, which has adapted OpenSIL to run on MSI’s PRO B850-P, a mainstream AM5 motherboard. Unlike server SKUs, desktop AM5 platforms introduce added complexity—particularly in how the Platform Security Processor (PSP) handles CPU families. In server chips, each CPU variant typically requires its own PSP directory, but desktop designs consolidate multiple families into a single directory, demanding new parsing logic.
Key Milestones and Remaining Hurdles
- Basic Boot Achieved: The current build successfully initializes the system, though it remains far from production-ready.
- Desktop vs. Mobile Distinction: Next steps involve refining Coreboot to differentiate between mobile and desktop Phoenix SoCs, addressing architectural differences in memory controllers and power states.
- PSP Directory Challenges: The team acknowledges that desktop PSP directories are more intricate, requiring robust methods to identify supported CPUs—an area still under active development.
- Not for Production: Emphasized as a proof-of-concept, the project is not yet optimized for end-user deployment.
For context, OpenSIL’s server adoption began with AMD’s EPYC Turin (Zen 5) in 2025, but consumer AM5 support has lagged due to the architectural gaps highlighted by 3mdeb. The firm’s work builds on prior experiments, including a Gigabyte MZ33-AR1 port funded by the NLnet Foundation, which demonstrated SEV-SNP attestation—a security feature critical for virtualization workloads.
Looking ahead, the team plans to expand OpenSIL’s desktop capabilities, though widespread adoption hinges on resolving PSP directory ambiguities and ensuring stability across diverse AM5 chipsets. Until then, enthusiasts and developers are advised to monitor updates, as the project remains in flux.
Note: This development does not affect current Ryzen 9000X3D, 9950X3D, or 9850X3D CPUs, nor does it alter AMD’s roadmap for Zen 6 (2 nm CCDs/3 nm I/O) or upcoming GPU releases like the RX 9070 series.
