Hi,

> I want to implement a GSM Mobile stack with USRP as RF Frontend.

Well, I am currently working on that. I don't stick on a specific SDR
device like mentioned one.

> Is it possible to build the DSP part of osmocommbb in a different
> TI DSP board other than calypso.

In case of SDR, DSP part should be done on computer side, like
OsmoTRX does. And some low-level GSM L1 part is already
implemented and could be used by MS implementation too.

If you would like to cooperate me in this direction,
have a look at:

https://github.com/axilirator/osmocom-bb

Right now I am doing some code refactoring, and further
commits will be posted at http://gerrit.osmocom.org/

With best regards,
Vadim Yanitskiy.