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Bus Blaster JTAG debugger / Re: FTDI 2232 high speed programmer debugger (JTAG/SPI/I2C/UART)
http://randomprojects.org/wiki/Floss-JTAG
It is also being used by the Openpilot project as their main device JTAG interface:
http://wiki.openpilot.org/Floss-JTAG
They are already compatible with OpenOCD, and the second interface is wired as a high-speed serial port. I'm using it at 4Mbps to communicate with some
sensors we are developing at the University where I work.
The board was designed in EAGLE and it is also available here:
$ git clone git://github.com/esden/floss-jtag.git
It might be worth looking at it for ideas, or to extend it to become the Bus-Buster.