diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 0000000..ac37741
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,6 @@
+[submodule "rocket-chip"]
+	path = rocket-chip
+	url = git@github.com:ucb-bar/rocket-chip.git
+[submodule "sifive-blocks"]
+	path = sifive-blocks
+	url = git@github.com:sifive/sifive-blocks.git
diff --git a/rocket-chip b/rocket-chip
new file mode 160000
index 0000000..4146f6a
--- /dev/null
+++ b/rocket-chip
@@ -0,0 +1 @@
+Subproject commit 4146f6a792277297bd80d4b6f1b6f2b3cb0f31d7
diff --git a/sifive-blocks b/sifive-blocks
new file mode 160000
index 0000000..7916ef5
--- /dev/null
+++ b/sifive-blocks
@@ -0,0 +1 @@
+Subproject commit 7916ef5249c72a3a84c599d123760f4d716de58a