Thread:Beagleboard talk:MicroSD As Extra Storage/Hangs on A5A

The suggested uEnv.txt:

mmcdev=1 bootpart=1:2 mmcroot=/dev/mmcblk1p2 ro optargs=quiet

hangs for ever on my A5A. The blue LED next to the 5V socket comes on and stays on, but nothing else happens. No HDMI output, so no error messages. I've tried with two microSD cards on two BBBs.