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-simple.c

@@ -0,0 +1,48 @@
+/*
+ * 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 <mapmem.h>
+#include <asm/io.h>
+
+static int simple_hello(struct udevice *dev, int ch)
+{
+	const struct dm_demo_pdata *pdata = dev_get_platdata(dev);
+
+	printf("Hello from %08x: %s %d\n", map_to_sysmem(dev), pdata->colour,
+	       pdata->sides);
+
+	return 0;
+}
+
+static const struct demo_ops simple_ops = {
+	.hello = simple_hello,
+};
+
+static int demo_shape_ofdata_to_platdata(struct udevice *dev)
+{
+	/* Parse the data that is common with all demo devices */
+	return demo_parse_dt(dev);
+}
+
+static const struct udevice_id demo_shape_id[] = {
+	{ "demo-simple", 0 },
+	{ },
+};
+
+U_BOOT_DRIVER(demo_simple_drv) = {
+	.name	= "demo_simple_drv",
+	.of_match = demo_shape_id,
+	.id	= UCLASS_DEMO,
+	.ofdata_to_platdata = demo_shape_ofdata_to_platdata,
+	.ops	= &simple_ops,
+	.platdata_auto_alloc_size = sizeof(struct dm_demo_pdata),
+};