I have the prototype of my DSP board for the Raspberry Pi running. Not all features have been tested yet, but the analog output is already working. If everything is working, the board can be used as a sound card for the Raspberry (2 channel in, 2 channel out) our as a standalone pass-trough DSP.
Programming the DSP is done from the Raspberry Pi. There is still a lot of work to do on the software side. But the basic functionality to upload a program to the DSP is already working.
The software can be found here:
More information about the product on my web site: