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/rockchip/kylin_rk3036/kylin_rk3036.c

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// SPDX-License-Identifier: GPL-2.0+
/*
* (C) Copyright 2015 Rockchip Electronics Co., Ltd
*/
#include <common.h>
#include <dm.h>
#include <asm/io.h>
#include <asm/arch/uart.h>
#include <asm/arch/sdram_rk3036.h>
#include <asm/gpio.h>
void get_ddr_config(struct rk3036_ddr_config *config)
{
/* K4B4G1646Q config */
config->ddr_type = 3;
config->rank = 1;
config->cs0_row = 15;
config->cs1_row = 15;
/* 8bank */
config->bank = 3;
config->col = 10;
/* 16bit bw */
config->bw = 1;
}
#define FASTBOOT_KEY_GPIO 93
int fastboot_key_pressed(void)
{
gpio_request(FASTBOOT_KEY_GPIO, "fastboot_key");
gpio_direction_input(FASTBOOT_KEY_GPIO);
return !gpio_get_value(FASTBOOT_KEY_GPIO);
}
#define ROCKCHIP_BOOT_MODE_FASTBOOT 0x5242C309
int rk_board_late_init(void)
{
if (fastboot_key_pressed()) {
printf("enter fastboot!\n");
env_set("preboot", "setenv preboot; fastboot usb0");
}
return 0;
}