diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 0000000..262c87b
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,3 @@
+[submodule "Common"]
+	path = Common
+	url = ssh://git@git.xajhuang.com:30001/xajhuang/PV1_Comm.git
diff --git a/Common b/Common
new file mode 160000
index 0000000..3ea4321
--- /dev/null
+++ b/Common
@@ -0,0 +1 @@
+Subproject commit 3ea4321784e17f2a1a644da701d32b0067f70fca