kprince

I don't have this board yet, but I have done ethernet driver development in the past. You really want to make sure that your setup is valid. I suggest switching out the ethernet cable and switch. A lot of these embedded PHY's are quirky (that is why linux kernel is filled with vendor specific phy drivers) and different switches can cause issues. Another potential problem is a bad cable.

I am trying to understand both kernel and userland setup here -- and how it differs from mainline linux/debian/ubuntu/yocto/buildroot.

Do you guys have any developer documentation? It seems like you could use help mainlining things, but it is hard to tell where to start