You don’t have the correct device tree loaded.
By default the build loads the Verdin full sized carrier board device tree. It’s hard coded in the U-BOOT code. The chart found here was somewhat of a myth when I hit this. That was quite a few months ago though.
Start with this thread. It is the most recent I know about.
This conversation is for sound, but also might help.
Ah! Here it is! Jeremias shouldn’t have to walk that plank twice.
Please note the part of the discussion talking about
uEnv.txt
Been a while since I thought about it, but I was horrified to hear that as it leaves the device open to Chameleon attack, or at least I feel it does.
Please note the dates of these message threads if things don’t work for you. I’m sure some things have changed with later releases of the software.