Last week the 3mdeb firmware consulting firm released the first open-source firmware for a modern AMD Ryzen AM5 platform with their work to port AMD openSIL and Coreboot in their downstream Dasharo flavor to an MSI desktop ATX motherboard.
Now that it's working out well, 3mdeb is working to upstream their AM5 platform support and Phoenix SoC support into upstream AMD openSIL as well as Coreboot...