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/block/sata_sandbox.c

@@ -0,0 +1,33 @@
+/*
+ * Copyright (C) 2015 Google, Inc
+ * Written by Simon Glass <sjg@chromium.org>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+
+int init_sata(int dev)
+{
+	return 0;
+}
+
+int reset_sata(int dev)
+{
+	return 0;
+}
+
+int scan_sata(int dev)
+{
+	return 0;
+}
+
+ulong sata_read(int dev, ulong blknr, lbaint_t blkcnt, void *buffer)
+{
+	return 0;
+}
+
+ulong sata_write(int dev, ulong blknr, lbaint_t blkcnt, const void *buffer)
+{
+	return 0;
+}