Hey I am trying to use the method discussed here: http://electronicsembedded.blogspot.com/2014/10/beaglebone-black-using-sd-card-as-extra.html
I am following the instructions, I have named my SD card ‘BBB_Ext’ and my uEnv.txt looks as follows:
mmcdev=1
bootpart=1:2
mmcroot=/dev/BBB_Ext ro
optargs=quiet
I have also put the following line in the fstab file:
/dev/mmcblk0p1 /media/card auto auto,rw,async,user,nofail 0 0
It remains on with 3 LED and won't boot. It works fine without the SD card in (I can SSH into it no problem).