Interesting. I'm currently having great fun learning systems programming on the Allwinner A64, and never considered the option of building a board with one, assuming they are still available. Are you documentating your project somewhere?

I'm not but I totally could!

Feel free to drop me a line - my email is firstname@website, where both can be found on my GitHub profile (same username as HN).

And yes, the A64 is still available! https://www.lcsc.com/product-detail/C3036453.html