Update seed and builder image version

Author: ataffanel

.github/workflows/CI.yml

@@ -14,4 +14,4 @@ jobs:
     steps:
     - uses: actions/checkout@v2
     - name: Check and build
-      run: docker run --rm -v ${PWD}:/module bitcraze/fpga-builder:2 tools/build/build
+      run: docker run --rm -v ${PWD}:/module bitcraze/fpga-builder:3 tools/build/build

Makefile

@@ -1,6 +1,6 @@
 PROJ = lighthouse
 
-VERSION ?=
+VERSION ?= 6
 
 PIN_DEF = lighthouse4_revB.pcf
 DEVICE = up5k
@@ -17,7 +17,7 @@ $(PROJ).json: LighthouseTopLevel.v
 	yosys -p 'read_verilog LighthouseTopLevel.v; read_verilog  blackboxes.v; synth_ice40 -top LighthouseTopLevel; write_json $@'
 
 %.asc: %.json $(PIN_DEF)
-	nextpnr-ice40 --seed 0 --up5k --package sg48 --json $< --asc $@ --pcf $(PIN_DEF)
+	nextpnr-ice40 --seed 16 --up5k --package sg48 --json $< --asc $@ --pcf $(PIN_DEF) --freq 24
 	python3 tools/update_bitstream_comment.py $@ "$(VERSION)"
 
 %.bin: %.asc