Hi,
I assume you're trying to get at the Blackfin code (not the FPGA side of things, thus?). I have an old DS1102, I believe they were based on the same cores with different peripherals, though.
The easy way used to be ICEbear JTAG (discontinued), you might get lucky with other FT2232H based solutions and lots of messy hacking around OpenOCD or urjtag.