upstream u-boot with additional patches for our devices/boards: https://lists.denx.de/pipermail/u-boot/2017-March/282789.html (AXP crashes) ; Gbit ethernet patch for some LIME2 revisions ; with SPI flash support
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u-boot/board/st/stm32f429-discovery/led.c

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/*
* (C) Copyright 2015
* Kamil Lulko, <kamil.lulko@gmail.com>
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <asm-generic/gpio.h>
void coloured_LED_init(void)
{
gpio_direction_output(CONFIG_RED_LED, 0);
gpio_direction_output(CONFIG_GREEN_LED, 0);
}
void red_led_off(void)
{
gpio_set_value(CONFIG_RED_LED, 0);
}
void green_led_off(void)
{
gpio_set_value(CONFIG_GREEN_LED, 0);
}
void red_led_on(void)
{
gpio_set_value(CONFIG_RED_LED, 1);
}
void green_led_on(void)
{
gpio_set_value(CONFIG_GREEN_LED, 1);
}