BBB: DDR3 is now initialized, next step is initializing MMC interface.

[Ed Sutter]

http://www.umonfw.com/docs/umon_user_manual.pdf
See chapter 16
>>> Also, you can use the "MT" command to just let the board loop on the memory
>>> space testing it for a while.  That should just run cleanly until you stop
>>> it.
>> That is definitely handy.  I'll be looking into the "mt" command" that
>> way I can test the DDR3 memory even further.
>>
> Is there a document with all the available commands? It would seem to
> be a handy self-contained reference manual.