honestly:
Thank you so much for trying, this. I also thought about it, but i miss some background in microelectronics,
I am more into programming.
It's really great someone tries this.
But:
Other people trying to do the same, or who would like to get into it, would really profit from you marking spots*(soldering points) on the photos you uploaded.
You should also write a bit more into the readme
and write a documentation.
F.I. about what that other board is that you hook up SEGAs allwinner-board to.
Or your thoughts and a document you update, whenever you make some progress.
*(DOCUMENTATION.md)
If you would do that, maybe other people could contribute to that hack.