I don't think so - at least according to their site, the J2 build chain uses Xilinx ISE: http://0pf.org/j-core.html http://0pf.org/j-core.html . The only fully

I don't think so - at least according to their site, the J2 build chain uses Xilinx ISE: http://0pf.org/j-core.html http://0pf.org/j-core.html . The only fully open FPGA toolchain I'm aware of targets Lattice/SiliconBLUE iCE40: https://github.com/cseed/arachne-pnr https://github.com/cseed/arachne-pnr