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/sandbox/include/asm/gpio.h

@@ -0,0 +1,85 @@
+/*
+ * This is the interface to the sandbox GPIO driver for test code which
+ * wants to change the GPIO values reported to U-Boot.
+ *
+ * Copyright (c) 2011 The Chromium OS Authors.
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#ifndef __ASM_SANDBOX_GPIO_H
+#define __ASM_SANDBOX_GPIO_H
+
+/*
+ * We use the generic interface, and add a back-channel.
+ *
+ * The back-channel functions are declared in this file. They should not be used
+ * except in test code.
+ *
+ * Test code can, for example, call sandbox_gpio_set_value() to set the value of
+ * a simulated GPIO. From then on, normal code in U-Boot will see this new
+ * value when it calls gpio_get_value().
+ *
+ * NOTE: DO NOT use the functions in this file except in test code!
+ */
+#include <asm-generic/gpio.h>
+
+/**
+ * Return the simulated value of a GPIO (used only in sandbox test code)
+ *
+ * @param dev		device to use
+ * @param offset	GPIO offset within bank
+ * @return -1 on error, 0 if GPIO is low, >0 if high
+ */
+int sandbox_gpio_get_value(struct udevice *dev, unsigned int offset);
+
+/**
+ * Set the simulated value of a GPIO (used only in sandbox test code)
+ *
+ * @param dev		device to use
+ * @param offset	GPIO offset within bank
+ * @param value		value to set (0 for low, non-zero for high)
+ * @return -1 on error, 0 if ok
+ */
+int sandbox_gpio_set_value(struct udevice *dev, unsigned int offset, int value);
+
+/**
+ * Set or reset the simulated open drain mode of a GPIO (used only in sandbox
+ * test code)
+ *
+ * @param gp	GPIO number
+ * @param value	value to set (0 for enabled open drain mode, non-zero for
+ * 		disabled)
+ * @return -1 on error, 0 if ok
+ */
+int sandbox_gpio_set_open_drain(struct udevice *dev, unsigned offset, int value);
+
+/**
+ * Return the state of the simulated open drain mode of a GPIO (used only in
+ * sandbox test code)
+ *
+ * @param gp	GPIO number
+ * @return -1 on error, 0 if GPIO is input, >0 if output
+ */
+int sandbox_gpio_get_open_drain(struct udevice *dev, unsigned offset);
+
+/**
+ * Return the simulated direction of a GPIO (used only in sandbox test code)
+ *
+ * @param dev		device to use
+ * @param offset	GPIO offset within bank
+ * @return -1 on error, 0 if GPIO is input, >0 if output
+ */
+int sandbox_gpio_get_direction(struct udevice *dev, unsigned int offset);
+
+/**
+ * Set the simulated direction of a GPIO (used only in sandbox test code)
+ *
+ * @param dev		device to use
+ * @param offset	GPIO offset within bank
+ * @param output 	0 to set as input, 1 to set as output
+ * @return -1 on error, 0 if ok
+ */
+int sandbox_gpio_set_direction(struct udevice *dev, unsigned int offset,
+			       int output);
+
+#endif