myxal bethencsoft A10 should work in theory. I have no devices with it, so I didn't prepare anything. A1000 seems easy to support, but mainline DT is missing display related nodes. If anyone of you can provide me patch which would enable video output, I'll prepare test images.
Note, A10 has limited memory throughput. It may have troubles pushing full HD image out.
I don't know if I can help you. I have some linux distributions images with video output working, but I am not sure if it can help you.
Surely you already know them anyway.