OKAY. What happens when I connect these?
Well, I'd pick up some old RAM and try the same thing you did.
But before that I'll just try it without cables, but with an up-to-date kernel.
I have an Asus Pro WS X570 that I would like to try this with.
What contacts did you connect?
I found something else yesterday.
In the "AMD Generic Encapsulated Software Architecture (AGESA™) Interface Specification" from the year 2017 describes something interesting.
Otherwise, you can also read through the error handling starting from chapter 3.1.3...
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