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/dm-demo.h

@@ -0,0 +1,40 @@
+/*
+ * Copyright (c) 2013 Google, Inc
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#ifndef __DM_DEMO_H
+#define __DM_DEMO_H
+
+#include <dm.h>
+
+/**
+ * struct dm_demo_pdata - configuration data for demo instance
+ *
+ * @colour: Color of the demo
+ * @sides: Numbers of sides
+ * @default_char: Default ASCII character to output (65 = 'A')
+ */
+struct dm_demo_pdata {
+	const char *colour;
+	int sides;
+	int default_char;
+};
+
+struct demo_ops {
+	int (*hello)(struct udevice *dev, int ch);
+	int (*status)(struct udevice *dev, int *status);
+	int (*set_light)(struct udevice *dev, int light);
+	int (*get_light)(struct udevice *dev);
+};
+
+int demo_hello(struct udevice *dev, int ch);
+int demo_status(struct udevice *dev, int *status);
+int demo_set_light(struct udevice *dev, int light);
+int demo_get_light(struct udevice *dev);
+int demo_list(void);
+
+int demo_parse_dt(struct udevice *dev);
+
+#endif