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/cpu/blackfin/watchdog.c

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/*
* watchdog.c - driver for Blackfin on-chip watchdog
*
* Copyright (c) 2007-2008 Analog Devices Inc.
*
* Licensed under the GPL-2 or later.
*/
#include <common.h>
#include <watchdog.h>
#include <asm/blackfin.h>
#ifdef CONFIG_HW_WATCHDOG
void hw_watchdog_reset(void)
{
bfin_write_WDOG_STAT(0);
}
void hw_watchdog_init(void)
{
bfin_write_WDOG_CNT(5 * get_sclk()); /* 5 second timeout */
hw_watchdog_reset();
bfin_write_WDOG_CTL(0x0);
}
#endif