[beagleboard] Looking for overview info on BeagleBoard SDR projects

I'm interested in experimenting with SDR on the BeagleBoard, and
rather than just jump in and start compiling stuff, I like to take an
organized approach. I've looked at the Beagle SDR (AKA OpenSDR)
project page, and the BeagleBrick, GNU Radio, and USRP project pages.
I'm finding lots of nitty-gritty details, source code packages, and
project status information; so far, so good. I also understand basic
principles of SDR, and what an SCA framework is and does (having built
one).

What I would like to find for *any* SDR implementation on the
BeagleBoard, but cannot seem to locate, is a top-level description of
what the SDR architecture looks like -- what specific frequency ranges
and voice/data modes are handled; what is the module breakdown; what
functions are allocated to the Linux CPU, the TI DSP core, and
external hardware; and what is the data flow through these modules.
Once I understand those, I'll be able to make sense of the source code
packages and, if I'm lucky, be able to build something that does what
I want it to. (At which point I may be able to give back by writing
some introductory material that embodies the info I was looking for so
the next guy to come along has it easier).

Can anyone point me to this kind of information for any BeagleBoard
SDR project?

Thanks, Steve