@normanherms
I was able to boot and ping the a7s board. I'm unable to ssh though. I don't have a TTL-bridge to setup the password!
PS the build took around 50mins.
EDIT: I was able to hook up a UART TTL bridge and login! bootlog here: https://pastebin.com/9H0gyYAJ
@normanherms great thanks. seems amazing work. I shall try it.
But I have an old 'weak' desktop Might be a showstopper for compiling the image (It's a i5 4570 cpu).
If I can successfully build images, I can volunteer to test too. Thanks.