Source for the ASP firmware is at https://github.com/amd/AMD-ASPFW.

It has a number of gaps, but it is mostly there. It doesn't build, it doesn't have source for some of the service calls iirc (SVC_.*), and the AGESA source isn't open (though a replacement is in progress, openSIL).

The blog post describes the analysis of PSP blobs on Gigabyte. MZ33-AR1. The analysis covers various aspects of stitching AMD firmware BIOS images and how support for stitching Turin blobs was developed in coreboot.

This is a ridiculously cool blogpost. Thanks for sharing. Lots of detail.

Since you've looked at the firmware there quite a lot would you be able to share if you noticed if ES/QS CPUs have different configurations in the firmware or if it's just a matter of duplicating and renaming so that they're recognized?