I was able to successfully merge overlayfs v13 support to sunxi kernel 3.4.75 (ported from 3.4.0-rc7) for my new cubieboard2.
If you own a development board based on Allwinner Socs (A10, A10s, A12, A13, A20), just give it a shot:
- https://github.com/x-drum/linux-sunxi/tree/sunxi-3.4-ovl13 (tree)
- https://github.com/x-drum/linux-sunxi/releases/tag/3.4.75-ovl13 (download)
Update: bumped to the 3.4.79 release https://github.com/x-drum/linux-sunxi/releases/tag/3.4.79-ovl13