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/arch/arm/cpu/arm1176/bcm2835/reset.c

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/*
* (C) Copyright 2012 Stephen Warren
*
* See file CREDITS for list of people who contributed to this
* project.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* version 2 as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <common.h>
#include <asm/io.h>
#include <asm/arch/wdog.h>
#define RESET_TIMEOUT 10
void reset_cpu(ulong addr)
{
struct bcm2835_wdog_regs *regs =
(struct bcm2835_wdog_regs *)BCM2835_WDOG_PHYSADDR;
uint32_t rstc;
rstc = readl(&regs->rstc);
rstc &= ~BCM2835_WDOG_RSTC_WRCFG_MASK;
rstc |= BCM2835_WDOG_RSTC_WRCFG_FULL_RESET;
writel(BCM2835_WDOG_PASSWORD | RESET_TIMEOUT, &regs->wdog);
writel(BCM2835_WDOG_PASSWORD | rstc, &regs->rstc);
}