I've got a supermicro H8SCM board, although I don't think I've ever tried to boot it, so I don't know its state. I also suspect that it's got a family 10h processor, not a fam15.
I can try to get it set up this weekend, and I can bring it to the conference with me if that would help. Here's the list of boards I've got for future reference: https://www.coreboot.org/User:MartinRoth#Platforms_supported_by_coreboot
I've got very mixed feelings about pushing the changes that we know aren't going to work, especially right before we abandon the boards to a branch. The idea is that the branch should be in a working state, though as mentioned, we have no idea if these boards are currently working. On the other hand, I don't want to get in the way of the progress on the AGESA changes. I guess if we do go ahead and push the changes, document them as well as we can and list what would need to be done to get the boards to a working state (for these changes).
Martin