Actually, I wonder if the tomthul one will work that way.
Yes, it's 4M or 8M, but it's non-autoconfig.
I map my RAM with a command that specifies the address space.
So possibly you could use that to MAP just the first 2M at that space (I believe that is where it sits),
(If so, I wonder if it's possible to disable autoconfig on Kipper2ks board??)
The more I think about it tho, the more I have my doubts, as the other memory is still there. So when the ACA autoconfigs it's memory, they might both have RAM there.. So, unless you could actually disable the extra RAM (so it's not connected at all), it might not work???