diff --git a/.gitmodules b/.gitmodules
index 87f8700b5..7391a785b 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -1,3 +1,6 @@
 [submodule "tools/mspsim"]
 	path = tools/mspsim
 	url = https://github.com/contiki-os/mspsim.git
+[submodule "tools/cc2538-bsl"]
+	path = tools/cc2538-bsl
+	url = https://github.com/JelmerT/cc2538-bsl.git
diff --git a/tools/cc2538-bsl b/tools/cc2538-bsl
new file mode 160000
index 000000000..1223bfe03
--- /dev/null
+++ b/tools/cc2538-bsl
@@ -0,0 +1 @@
+Subproject commit 1223bfe03cdb31c439f1a51593808cdabc1939d2