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/scripts/gcc-stack-usage.sh

@@ -0,0 +1,18 @@
+#!/bin/sh
+# Test for gcc '-fstack-usage' support
+# Copyright (C) 2013, Masahiro Yamada <yamada.m@jp.panasonic.com>
+#
+# SPDX-License-Identifier:	GPL-2.0+
+#
+
+TMP="$$"
+
+cat <<END | $@ -Werror -fstack-usage -x c - -c -o $TMP >/dev/null 2>&1 \
+							&& echo "y"
+int main(void)
+{
+	return 0;
+}
+END
+
+rm -f $TMP $TMP.su