fpga: x400: zbx: Improve Lattice make flow

Original-commit: fa8559bb0f334d80e08798d415117cedf86be923

tools/make/diamond_design_builder.mak

@@ -31,7 +31,10 @@ BUILD_DIAMOND_DESIGN = \
 	cp $(TOOLS_DIR)/scripts/dmd_design_build.tcl $(4)/build.tcl; \
 	cd $(4); \
 	echo "BUILDER: Implementating design..."; \
-	pnmainc build.tcl > $(1)_log.txt ; \
+	$(DIAMOND_EXE) build.tcl > $(1)_log.txt ; \
+	echo "BUILDER: Parsing reports..."; \
+	grep "Cumulative negative slack: 0 (0+0)" impl1/$(1)_impl1.twr ; \
+		if [ $$? -ne 0 ]; then exit 1; fi; \
 	echo "BUILDER: Generating bitfile..."; \
 	ddtcmd -oft -svfsingle -if $(5)/$(1)_$(5).jed			 	\
 		-dev $(2) -op "FLASH Erase,Program,Verify" -revd	\