tools/yosys/yosys -p 'synth_ice40 -top worker -blif $@' $<
%.asc: %.pcf %.blif
- tools/arachne-pnr/bin/arachne-pnr -d $(subst hx,,$(subst lp,,$(DEVICE))) -o $@ -p $^ -P tq144
+ tools/arachne-pnr/bin/arachne-pnr -d $(subst hx,,$(subst lp,,$(DEVICE))) -o $@ -p $^ -P tq144 -s 4
%.bin: %.asc
tools/icestorm/icepack/icepack $< $@