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/fdt_host.h

@@ -0,0 +1,16 @@
+/*
+ * (C) Copyright 2008 Semihalf
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#ifndef __FDT_HOST_H__
+#define __FDT_HOST_H__
+
+/* Make sure to include u-boot version of libfdt include files */
+#include "../include/libfdt.h"
+#include "../include/fdt_support.h"
+
+int fit_check_sign(const void *working_fdt, const void *key);
+
+#endif /* __FDT_HOST_H__ */