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/drivers/demo/demo-uclass.c

@@ -0,0 +1,79 @@
+/*
+ * Copyright (c) 2013 Google, Inc
+ *
+ * (C) Copyright 2012
+ * Pavel Herrmann <morpheus.ibis@gmail.com>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <dm-demo.h>
+#include <errno.h>
+#include <fdtdec.h>
+#include <malloc.h>
+#include <asm/io.h>
+#include <linux/list.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+UCLASS_DRIVER(demo) = {
+	.name		= "demo",
+	.id		= UCLASS_DEMO,
+};
+
+int demo_hello(struct udevice *dev, int ch)
+{
+	const struct demo_ops *ops = device_get_ops(dev);
+
+	if (!ops->hello)
+		return -ENOSYS;
+
+	return ops->hello(dev, ch);
+}
+
+int demo_status(struct udevice *dev, int *status)
+{
+	const struct demo_ops *ops = device_get_ops(dev);
+
+	if (!ops->status)
+		return -ENOSYS;
+
+	return ops->status(dev, status);
+}
+
+int demo_get_light(struct udevice *dev)
+{
+	const struct demo_ops *ops = device_get_ops(dev);
+
+	if (!ops->get_light)
+		return -ENOSYS;
+
+	return ops->get_light(dev);
+}
+
+int demo_set_light(struct udevice *dev, int light)
+{
+	const struct demo_ops *ops = device_get_ops(dev);
+
+	if (!ops->set_light)
+		return -ENOSYS;
+
+	return ops->set_light(dev, light);
+}
+
+int demo_parse_dt(struct udevice *dev)
+{
+	struct dm_demo_pdata *pdata = dev_get_platdata(dev);
+	int dn = dev->of_offset;
+
+	pdata->sides = fdtdec_get_int(gd->fdt_blob, dn, "sides", 0);
+	pdata->colour = fdt_getprop(gd->fdt_blob, dn, "colour", NULL);
+	if (!pdata->sides || !pdata->colour) {
+		debug("%s: Invalid device tree data\n", __func__);
+		return -EINVAL;
+	}
+
+	return 0;
+}