Custom OS

[z4v4l]

Dang it. I was hoping I wouldn't need to write a driver for anything. Was kinda hoping I could use my own self-coded bootloader that comes with my OS. I guess I won't be using the Pinebook then

That's funny. How did you write your "custom" OS for it then? Did you test or write it without testing?
If you don't wish to use u-boot, you can replace it with your "self-coded" bootloader. Just expose it for Boot ROM code the way it expects.
Admit it, your OS does exist only in your fantasies yet?