I managed, this week-end, finally relativly easily to add full hardware acceleration support on Cubieboard2. I used the current stage (beta) of linux-sunxi kernel, and followed step by step kernel compilation tutorial on linux-sunxi.org wiki. I slightly improved documentation, in the case of AllWinner A20.
Focus that created the system image I used to these modification also made an article about this, inspirated by some of my recommandations, and now, The modified image is available from the download area of cubieboard.org. You can still continue to read this article to understand how to for another distribution. I myself needed to apply some of this rules for my version of (l/x)ubuntu 13.10