diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 0000000..ef0a528
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,4 @@
+[submodule "zephyr"]
+	path = zephyr
+	url = https://github.com/olofk/zephyr
+	branch = serv
diff --git a/zephyr b/zephyr
new file mode 160000
index 0000000..5847aef
--- /dev/null
+++ b/zephyr
@@ -0,0 +1 @@
+Subproject commit 5847aef27d562c449292e98a3e94e3c9967afffd