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/usb_mass_storage.h

@@ -0,0 +1,33 @@
+/*
+ * Copyright (C) 2011 Samsung Electrnoics
+ * Lukasz Majewski <l.majewski@samsung.com>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#ifndef __USB_MASS_STORAGE_H__
+#define __USB_MASS_STORAGE_H__
+
+#define SECTOR_SIZE		0x200
+#include <part.h>
+#include <linux/usb/composite.h>
+
+/* Wait at maximum 60 seconds for cable connection */
+#define UMS_CABLE_READY_TIMEOUT	60
+
+struct ums {
+	int (*read_sector)(struct ums *ums_dev,
+			   ulong start, lbaint_t blkcnt, void *buf);
+	int (*write_sector)(struct ums *ums_dev,
+			    ulong start, lbaint_t blkcnt, const void *buf);
+	unsigned int start_sector;
+	unsigned int num_sectors;
+	const char *name;
+	struct blk_desc block_dev;
+};
+
+int fsg_init(struct ums *ums_devs, int count);
+void fsg_cleanup(void);
+int fsg_main_thread(void *);
+int fsg_add(struct usb_configuration *c);
+#endif /* __USB_MASS_STORAGE_H__ */