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/image-sparse.h

@@ -0,0 +1,40 @@
+/*
+ * Copyright 2014 Broadcom Corporation.
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <part.h>
+#include <sparse_format.h>
+
+#define ROUNDUP(x, y)	(((x) + ((y) - 1)) & ~((y) - 1))
+
+struct sparse_storage {
+	lbaint_t	blksz;
+	lbaint_t	start;
+	lbaint_t	size;
+	void		*priv;
+
+	lbaint_t	(*write)(struct sparse_storage *info,
+				 lbaint_t blk,
+				 lbaint_t blkcnt,
+				 const void *buffer);
+
+	lbaint_t	(*reserve)(struct sparse_storage *info,
+				 lbaint_t blk,
+				 lbaint_t blkcnt);
+};
+
+static inline int is_sparse_image(void *buf)
+{
+	sparse_header_t *s_header = (sparse_header_t *)buf;
+
+	if ((le32_to_cpu(s_header->magic) == SPARSE_HEADER_MAGIC) &&
+	    (le16_to_cpu(s_header->major_version) == 1))
+		return 1;
+
+	return 0;
+}
+
+void write_sparse_image(struct sparse_storage *info, const char *part_name,
+			void *data, unsigned sz);