diff --git a/.gitmodules b/.gitmodules
index 7735bc2d03..d2d8dd2783 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -11,3 +11,7 @@
 [submodule "lib/berkeley-db-1.xx"]
 	path = lib/berkeley-db-1.xx
 	url = https://github.com/pfalcon/berkeley-db-1.xx
+[submodule "lib/stm32lib"]
+	path = lib/stm32lib
+	url = https://github.com/micropython/stm32lib
+	branch = work-F4-1.13.1+F7-1.5.0+L4-1.3.0
diff --git a/lib/stm32lib b/lib/stm32lib
new file mode 160000
index 0000000000..f8a1dd8cee
--- /dev/null
+++ b/lib/stm32lib
@@ -0,0 +1 @@
+Subproject commit f8a1dd8ceeef1004cf8c964816af6a8530611451