Yes, your uSD card needs to have a u-boot (msdosfs) boot partition.
When a uSD card is inserted, the boot devices get switched in the bootloader, so your uenv.txt on the external card should be something like this to boot from build in flash.

bootcmd=mmc rescan ; setenv loadaddr 0x82800000; setenv bootargs sd0i:/bsd.umg ; fatload mmc 1 ${loadaddr} bsd.umg ; bootm ${loadaddr} ;
uenvcmd=boot

I can't quite remember maybe it really was ...fatload mmc 0 ${load...

- Ben

On 05/25/14 06:34, Neoklis Kyriazis wrote:
Hi list

I have installed 5.5 on my BB Black but I just can't get it to boot from the 
built-in mmc/flash drive when an uSD card is plugged in. I need this to hold 
large volumes of data (my website and torrent downloads) and it must be plugged 
in to be detected on reboots or power cuts.

I tried some hacks I found by searching but I still have the problem. Any 
suggestions please?

Thanks!

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