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/tools/os_support.h

@@ -0,0 +1,23 @@
+/*
+ * Copyright 2009 Extreme Engineering Solutions, Inc.
+ *
+ * SPDX-License-Identifier:	LGPL-2.0+
+ */
+
+#ifndef __OS_SUPPORT_H_
+#define __OS_SUPPORT_H_
+
+#include "compiler.h"
+
+/*
+ * Include additional files required for supporting different operating systems
+ */
+#ifdef __MINGW32__
+#include "mingw_support.h"
+#endif
+
+#if defined(__APPLE__) && __DARWIN_C_LEVEL < 200809L
+#include "getline.h"
+#endif
+
+#endif /* __OS_SUPPORT_H_ */