avionic design with actual uboot and tooling

submodule of avionic design uboot bootloader and with included tools to
get you started , read readme.md and readme-tk1-loader.md

u-boot/test/py/tests/test_unknown_cmd.py

@@ -0,0 +1,14 @@
+# Copyright (c) 2015 Stephen Warren
+# Copyright (c) 2016, NVIDIA CORPORATION. All rights reserved.
+#
+# SPDX-License-Identifier: GPL-2.0
+
+def test_unknown_command(u_boot_console):
+    """Test that executing an unknown command causes U-Boot to print an
+    error."""
+
+    # The "unknown command" error is actively expected here,
+    # so error detection for it is disabled.
+    with u_boot_console.disable_check('unknown_command'):
+        response = u_boot_console.run_command('non_existent_cmd')
+    assert('Unknown command \'non_existent_cmd\' - try \'help\'' in response)