Hi @dj5 - we open sourced AMD openSIL for AMD 4th Gen EPYC CPU (code named Genoa), that you may find at https://github.com/openSIL. Our open source partners plan to open source host firmwares based on UEFI and coreboot that can integrate openSIL for AMD CRB based on Genoa CPU in the very near future.
Please reach out to me at raj.kapoor@amd.com with specifics and we can potentially look into integrating you into our list of development/contributing partners.
Please also note, Genoa is not a POR intercept of the AMD openSIL that was recently open-sourced and is meant only for evaluation of openSIL as a future intercept. For details, please refer to the OCP presentation that you may find here - https://drive.google.com/file/d/1Y__J0OwVZ_gx54dGeDW4mxtc1dmRoG32/view.