Did you update your yocto linux? You can also try posting a little bit more terminal log. I don't see a "Mounting /home" step while booting the latest linux distribution with my hardware configuration.
Sorry, but I have the normal, small factor, breakout board so I can not follow your problem.
The solution is to reset the bootargs_mode in U-Boot and re-flash the OS.
1. Boot with the serial console connected and hit a key at the "Hit any key to stop autoboot:" prompt
2. boot > setenv bootargs_mode flash
3. boot > saveenv
Saving Environment to MMC...
Writing to MMC(0)... done
4. boot > reset
You then can use the flashall.sh script to reload the OS