I wish. Currently the BKDG (Bios and Kernel Developers Guide) is still only available under NDA.
The public stuff is comprised of the 17h documents on here:
https://developer.amd.com/resources/developer-guides-manuals/
Which Includes the Registers reference, the Processor Programming Reference and Software optimization guide. Some prior documents still apply such as for the PSP.
Some reverse engineered stuff on the Ryzen Pipeline here:
http://agner.org/optimize/microarchitecture.pdf
And whatever I’ve previously dumped here:
And probably a good deal more stuff I’m forgetting about.
But no errata spec/BKDG.
Most of the errata (atleast the fixed ones) are currently best found by looking at the linux kernel.