diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 0000000..47c5be8
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,6 @@
+[submodule "pigweed"]
+	path = pigweed
+	url = ../pigweed
+[submodule "zephyr"]
+	path = zephyr
+	url = ../../third_party/github/zephyrproject-rtos/zephyr
diff --git a/pigweed b/pigweed
new file mode 160000
index 0000000..dca0050
--- /dev/null
+++ b/pigweed
@@ -0,0 +1 @@
+Subproject commit dca0050abe79b85b5bbce45b0b6c3815b241bb59
diff --git a/zephyr b/zephyr
new file mode 160000
index 0000000..7f6b762
--- /dev/null
+++ b/zephyr
@@ -0,0 +1 @@
+Subproject commit 7f6b762a734b793a031103e12bbce865645d4f90