Add prototype rotor firmware skeleton

.gitmodules

@@ -1,3 +1,24 @@
 [submodule "prototype/dbg-connect"]
 	path = prototype/dbg-connect
-	url = git@git.jaseg.net:sjandrakei/pub/dbg-connect.git
+	url = https://git.jaseg.de/dbg-connect.git
+    branch = master
+
+[submodule "prototype/fw/upstream/cmsis-core"]
+	path = prototype/fw/upstream/cmsis-core
+	url = https://github.com/STMicroelectronics/cmsis_core
+    branch = master
+
+[submodule "prototype/fw/upstream/cmsis-device-f3"]
+	path = prototype/fw/upstream/cmsis-device-f3
+	url = https://github.com/STMicroelectronics/cmsis_device_f3
+    branch = master
+
+[submodule "prototype/fw/upstream/tinyprintf"]
+	path = prototype/fw/upstream/tinyprintf
+	url = https://github.com/cjlano/tinyprintf
+    branch = master
+
+[submodule "prototype/fw/upstream/stm32square"]
+	path = prototype/fw/upstream/stm32square
+	url = https://gitlab.com/neinseg/stm32square
+	branch = release