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/drivers/watchdog/bcm2835_wdt.c

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/*
* Watchdog driver for Broadcom BCM2835
*
* Copyright (C) 2017 Paolo Pisati <p.pisati@gmail.com>
*
* SPDX-License-Identifier: GPL-2.0
*/
#include <common.h>
#include <efi_loader.h>
#include <asm/io.h>
#include <asm/arch/wdog.h>
#define SECS_TO_WDOG_TICKS(x) ((x) << 16)
#define MAX_TIMEOUT 0xf /* ~15s */
static __efi_runtime_data bool enabled = true;
extern void reset_cpu(ulong ticks);
void hw_watchdog_reset(void)
{
if (enabled)
reset_cpu(SECS_TO_WDOG_TICKS(MAX_TIMEOUT));
}
void hw_watchdog_init(void)
{
hw_watchdog_reset();
}
void __efi_runtime hw_watchdog_disable(void)
{
enabled = false;
}