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/include/linux/mtd/concat.h

@@ -0,0 +1,24 @@
+/*
+ * MTD device concatenation layer definitions
+ *
+ * Copyright © 2002      Robert Kaiser <rkaiser@sysgo.de>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ *
+ */
+
+#ifndef MTD_CONCAT_H
+#define MTD_CONCAT_H
+
+struct mtd_info *mtd_concat_create(
+    struct mtd_info *subdev[],  /* subdevices to concatenate */
+    int num_devs,               /* number of subdevices      */
+#ifndef __UBOOT__
+    const char *name);          /* name for the new device   */
+#else
+    char *name);          /* name for the new device   */
+#endif
+
+void mtd_concat_destroy(struct mtd_info *mtd);
+
+#endif