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/arch/arm/mach-zynq/include/mach/gpio.h

@@ -0,0 +1,11 @@
+/*
+ * Copyright (c) 2013 Xilinx, Inc.
+ * Copyright (c) 2015 DAVE Embedded Systems
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#ifndef _ZYNQ_GPIO_H
+#define _ZYNQ_GPIO_H
+
+#endif /* _ZYNQ_GPIO_H */