litex-boards/litex_boards/targets/lambdaconcept_ecpix5.py --build \
     --cpu-type rocket --cpu-variant fulld --sys-clk-freq 50e6 \
     --with-ethernet --with-sdcard \
     --nextpnr-seed $RANDOM --nextpnr-timingstrict \
     [ --yosys-abc9 --yosys-nowidelut ]