diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 0000000..aff091e
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,9 @@
+[submodule "gd"]
+	path = gd
+	url = https://github.com/Godzil/gd1.git
+[submodule "j0/firmware"]
+	path = j0/firmware
+	url = https://github.com/Godzil/gd1-sdk.git
+[submodule "fpga/textmode"]
+	path = fpga/textmode
+	url = https://github.com/Godzil/gd-textmode.git
diff --git a/fpga/textmode b/fpga/textmode
new file mode 160000
index 0000000..cb1f25e
--- /dev/null
+++ b/fpga/textmode
@@ -0,0 +1 @@
+Subproject commit cb1f25e1b585764f8c25c28fb598403633df8d24
diff --git a/gd b/gd
new file mode 160000
index 0000000..b5e4f0a
--- /dev/null
+++ b/gd
@@ -0,0 +1 @@
+Subproject commit b5e4f0a05348034005bfc7e80d7c073d70ddb5a9
diff --git a/j0/firmware b/j0/firmware
new file mode 160000
index 0000000..a6d60f5
--- /dev/null
+++ b/j0/firmware
@@ -0,0 +1 @@
+Subproject commit a6d60f56015018fe37759c0daa4497621b9dbd06