diff --git a/.gitignore b/.gitignore
index 5febf4e..8fa2d56 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,4 @@
+/core_platform
 /core_software
 /linux_driver_stack
 /vela
diff --git a/externals.json b/externals.json
index e9dfc4f..b79c418 100644
--- a/externals.json
+++ b/externals.json
@@ -25,6 +25,16 @@
             "revision": "develop"
         },
         {
+            "path": "core_software/rtos/freertos",
+            "fetchurl": "https://github.com/aws/amazon-freertos.git",
+            "revision": "master"
+        },
+        {
+            "path": "core_software/rtos/freertos/freertos_kernel",
+            "fetchurl": "https://github.com/FreeRTOS/FreeRTOS-Kernel.git",
+            "revision": "master"
+        },
+        {
             "path": "core_software/tensorflow",
             "fetchurl": "https://github.com/tensorflow/tensorflow",
             "revision": "master"