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/include/asm/arch-hi6220/gpio.h

@@ -0,0 +1,27 @@
+/*
+ * Copyright (C) 2015 Linaro
+ * Peter Griffin <peter.griffin@linaro.org>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#ifndef _HI6220_GPIO_H_
+#define _HI6220_GPIO_H_
+
+#define HI6220_GPIO_BASE(bank)	(((bank < 4) ? 0xf8011000 : \
+				0xf7020000 - 0x4000) + (0x1000 * bank))
+
+#define HI6220_GPIO_PER_BANK	8
+#define HI6220_GPIO_DIR		0x400
+
+struct gpio_bank {
+	u8 *base;	/* address of registers in physical memory */
+};
+
+/* Information about a GPIO bank */
+struct hikey_gpio_platdata {
+	int bank_index;
+	ulong base;     /* address of registers in physical memory */
+};
+
+#endif /* _HI6220_GPIO_H_ */