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/mkimage.h

@@ -0,0 +1,49 @@
+/*
+ * (C) Copyright 2000-2004
+ * DENX Software Engineering
+ * Wolfgang Denk, wd@denx.de
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#ifndef _MKIIMAGE_H_
+#define _MKIIMAGE_H_
+
+#include "os_support.h"
+#include <errno.h>
+#include <fcntl.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/stat.h>
+#include <time.h>
+#include <unistd.h>
+#include <u-boot/sha1.h>
+#include "fdt_host.h"
+#include "imagetool.h"
+
+#undef MKIMAGE_DEBUG
+
+#ifdef MKIMAGE_DEBUG
+#define debug(fmt,args...)	printf (fmt ,##args)
+#else
+#define debug(fmt,args...)
+#endif /* MKIMAGE_DEBUG */
+
+static inline void *map_sysmem(ulong paddr, unsigned long len)
+{
+	return (void *)(uintptr_t)paddr;
+}
+
+static inline ulong map_to_sysmem(void *ptr)
+{
+	return (ulong)(uintptr_t)ptr;
+}
+
+#define MKIMAGE_TMPFILE_SUFFIX		".tmp"
+#define MKIMAGE_MAX_TMPFILE_LEN		256
+#define MKIMAGE_DEFAULT_DTC_OPTIONS	"-I dts -O dtb -p 500"
+#define MKIMAGE_MAX_DTC_CMDLINE_LEN	512
+#define MKIMAGE_DTC			"dtc"   /* assume dtc is in $PATH */
+
+#endif /* _MKIIMAGE_H_ */