"AMD Confirms It Won't Opensource EPYC's Platform Security Processor Code" https://hothardware.com/news/amd-confirms-it-will-not-be-ope... (2017)

Dr. Lisa Su gave some hope that something would be done when she said she'd discuss things internally as the result of a recent reddit AMA question. Ultimately, though, it turns out that AMD is not opening up the PSP

https://www.twitch.tv/videos/160097335?t=00h35m35s