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/cmd/fastboot.c

@@ -0,0 +1,69 @@
+/*
+ * Copyright 2008 - 2009 Windriver, <www.windriver.com>
+ * Author: Tom Rix <Tom.Rix@windriver.com>
+ *
+ * (C) Copyright 2014 Linaro, Ltd.
+ * Rob Herring <robh@kernel.org>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+#include <common.h>
+#include <command.h>
+#include <console.h>
+#include <g_dnl.h>
+#include <usb.h>
+
+static int do_fastboot(cmd_tbl_t *cmdtp, int flag, int argc, char *const argv[])
+{
+	int controller_index;
+	char *usb_controller;
+	int ret;
+
+	if (argc < 2)
+		return CMD_RET_USAGE;
+
+	usb_controller = argv[1];
+	controller_index = simple_strtoul(usb_controller, NULL, 0);
+
+	ret = board_usb_init(controller_index, USB_INIT_DEVICE);
+	if (ret) {
+		error("USB init failed: %d", ret);
+		return CMD_RET_FAILURE;
+	}
+
+	g_dnl_clear_detach();
+	ret = g_dnl_register("usb_dnl_fastboot");
+	if (ret)
+		return ret;
+
+	if (!g_dnl_board_usb_cable_connected()) {
+		puts("\rUSB cable not detected.\n" \
+		     "Command exit.\n");
+		ret = CMD_RET_FAILURE;
+		goto exit;
+	}
+
+	while (1) {
+		if (g_dnl_detach())
+			break;
+		if (ctrlc())
+			break;
+		usb_gadget_handle_interrupts(controller_index);
+	}
+
+	ret = CMD_RET_SUCCESS;
+
+exit:
+	g_dnl_unregister();
+	g_dnl_clear_detach();
+	board_usb_cleanup(controller_index, USB_INIT_DEVICE);
+
+	return ret;
+}
+
+U_BOOT_CMD(
+	fastboot, 2, 1, do_fastboot,
+	"use USB Fastboot protocol",
+	"<USB_controller>\n"
+	"    - run as a fastboot usb device"
+);