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/include/timer.h

@@ -0,0 +1,91 @@
+/*
+ * Copyright (C) 2015 Thomas Chou <thomas@wytron.com.tw>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#ifndef _TIMER_H_
+#define _TIMER_H_
+
+/*
+ * dm_timer_init - initialize a timer for time keeping. On success
+ * initializes gd->timer so that lib/timer can use it for future
+ * referrence.
+ *
+ * @return - 0 on success or error number
+ */
+int dm_timer_init(void);
+
+/*
+ * timer_conv_64 - convert 32-bit counter value to 64-bit
+ *
+ * @count: 32-bit counter value
+ * @return: 64-bit counter value
+ */
+u64 timer_conv_64(u32 count);
+
+/*
+ * Get the current timer count
+ *
+ * @dev: The timer device
+ * @count: pointer that returns the current timer count
+ * @return: 0 if OK, -ve on error
+ */
+int timer_get_count(struct udevice *dev, u64 *count);
+
+/*
+ * Get the timer input clock frequency
+ *
+ * @dev: The timer device
+ * @return: the timer input clock frequency
+ */
+unsigned long timer_get_rate(struct udevice *dev);
+
+/*
+ * struct timer_ops - Driver model timer operations
+ *
+ * The uclass interface is implemented by all timer devices which use
+ * driver model.
+ */
+struct timer_ops {
+	/*
+	 * Get the current timer count
+	 *
+	 * @dev: The timer device
+	 * @count: pointer that returns the current 64-bit timer count
+	 * @return: 0 if OK, -ve on error
+	 */
+	int (*get_count)(struct udevice *dev, u64 *count);
+};
+
+/*
+ * struct timer_dev_priv - information about a device used by the uclass
+ *
+ * @clock_rate: the timer input clock frequency
+ */
+struct timer_dev_priv {
+	unsigned long clock_rate;
+};
+
+/**
+ * timer_early_get_count() - Implement timer_get_count() before driver model
+ *
+ * If CONFIG_TIMER_EARLY is enabled, this function wil be called to return
+ * the current timer value before the proper driver model timer is ready.
+ * It should be implemented by one of the timer values. This is mostly useful
+ * for tracing.
+ */
+u64 timer_early_get_count(void);
+
+/**
+ * timer_early_get_rate() - Get the timer rate before driver model
+ *
+ * If CONFIG_TIMER_EARLY is enabled, this function wil be called to return
+ * the current timer rate in Hz before the proper driver model timer is ready.
+ * It should be implemented by one of the timer values. This is mostly useful
+ * for tracing. This corresponds to the clock_rate value in struct
+ * timer_dev_priv.
+ */
+unsigned long timer_early_get_rate(void);
+
+#endif	/* _TIMER_H_ */