FlexPRET may be run on an FPGA. Each supported FPGA board has its own folder. Currently, the only supported board is the Zedboard. Refer to the README.md there for getting started.
To create an FPGA bitstream, first run make fpga in the top-level directory. This will generate an FpgaTop.v file based on the Chisel code. The makefile system here will pick up that file.