Ok,
I got some response from VIA that K8T890CF is quite similar. As I said. There are some changes. Question is what to ask now, because the M2V seems to be not available.
Go for K8M890/VT8237A?
I have following plan. Someone from Coreboot community will also get NDA plus me. I think I'm able to answer most of the questions so I will act as some kind of filter and we shell ask VIA only in trouble.
Lets agree on the chipset first.
Rudolf