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/netgear/dgnd3700v2/dgnd3700v2.c

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// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (C) 2018 Álvaro Fernández Rojas <noltari@gmail.com>
*/
#include <common.h>
#include <asm/io.h>
#define GPIO_BASE_6362 0x10000080
#define GPIO_MODE_6362_REG 0x18
#define GPIO_MODE_6362_SERIAL_LED_DATA BIT(2)
#define GPIO_MODE_6362_SERIAL_LED_CLK BIT(3)
#ifdef CONFIG_BOARD_EARLY_INIT_F
int board_early_init_f(void)
{
void __iomem *gpio_regs = map_physmem(GPIO_BASE_6362, 0, MAP_NOCACHE);
/* Enable Serial LEDs */
setbits_be32(gpio_regs + GPIO_MODE_6362_REG,
GPIO_MODE_6362_SERIAL_LED_DATA |
GPIO_MODE_6362_SERIAL_LED_CLK);
return 0;
}
#endif