diff --git a/gateware/rtl/Makefile b/gateware/rtl/Makefile
index e0e97ea..702d664 100644
--- a/gateware/rtl/Makefile
+++ b/gateware/rtl/Makefile
@@ -3,11 +3,10 @@
 # For license terms, refer to the files in `doc/copying` in the Upsilon
 # source distribution.
 
-all:
-	echo "dummy"
+all: make_spi
 
-#make_spi:
-#	cd spi && make codegen
+make_spi:
+	cd spi && make codegen
 
 
 #make_bram:
diff --git a/gateware/rtl/spi/Makefile b/gateware/rtl/spi/Makefile
new file mode 100644
index 0000000..38fee98
--- /dev/null
+++ b/gateware/rtl/spi/Makefile
@@ -0,0 +1,7 @@
+include ../common.makefile
+.PHONY: codegen
+
+codegen: spi_master_preprocessed.v
+
+clean:
+	rm spi_master_preprocessed.v