1 files changed, 3 insertions, 1 deletions
diff --git a/Makefile b/Makefile
index f558ca1..c2824e5 100644
--- a/Makefile
+++ b/Makefile
@@ -3,6 +3,7 @@ MAKEFLAGS += --no-builtin-variables
 .SUFFIXES:
 
 PROGRAM ?= led
+FLASH_OPTS ?=
 
 all: $(PROGRAM).fs
 
@@ -29,8 +30,9 @@ tangnano9k.cst:
 %.fs: %.pnr.json
 	gowin_pack -d GW1N-9C -o $@ $<
 
+# flash: -f
 flash: led.fs
-	openFPGALoader -b tangnano9k -f led.fs
+	openFPGALoader -b tangnano9k  $(FLASH_OPTS) led.fs
 
 clean:
 	rm -rf *.json *.fs *.svg *.log