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/gdb/error.h

@@ -0,0 +1,14 @@
+/*
+ * (C) Copyright 2000
+ * Murray Jensen <Murray.Jensen@csiro.au>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <stdarg.h>
+
+extern char *pname;
+
+extern void Warning(char *, ...);
+extern void Error(char *, ...);
+extern void Perror(char *, ...);