This still feels like a poor idea. It is as if the manufacturer of the boards don't really know where the serial port is mapped or where the USB is, but 3 month

This still feels like a poor idea. It is as if the manufacturer of the boards don't really know where the serial port is mapped or where the USB is, but 3 months later someone will fix a DTB that allows you to find it. Noone would accept an x86 pc to not know itself well enough to hand you a list of its parts, but for some reason having to find the right mix of kernel, u-boot and DTB is considered "fine" for ARM boards, which I don't really understand.