[Balloon] Most recent known good for FPGA

It seems that the FPGA balloon gets a bit less attention than the CLPD version
and Wookey warned me off trying the latest a few days back. I tried something
older but that fails to build.

What's the most recent version of svn that:
* Supports FPGA.
* Has an FPGA binary file so there is no need to play with Xilinx tools
* Builds, boots and does healthy things?

Thanks

Charles