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/misc/syscon_sandbox.c

@@ -0,0 +1,27 @@
+/*
+ * Copyright (c) 2015 Google, Inc
+ * Written by Simon Glass <sjg@chromium.org>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <errno.h>
+#include <syscon.h>
+#include <asm/test.h>
+#include <dm/lists.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+static const struct udevice_id sandbox_syscon_ids[] = {
+	{ .compatible = "sandbox,syscon0", .data = SYSCON0 },
+	{ .compatible = "sandbox,syscon1", .data = SYSCON1 },
+	{ }
+};
+
+U_BOOT_DRIVER(sandbox_syscon) = {
+	.name	= "sandbox_syscon",
+	.id	= UCLASS_SYSCON,
+	.of_match = sandbox_syscon_ids,
+};