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/lib/stack.c

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/*
* Copyright (c) 2015 Andreas Bießmann <andreas@biessmann.org>
*
* Copyright (c) 2011 The Chromium OS Authors.
* (C) Copyright 2002-2006
* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
*
* (C) Copyright 2002
* Sysgo Real-Time Solutions, GmbH <www.elinos.com>
* Marius Groeger <mgroeger@sysgo.de>
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
DECLARE_GLOBAL_DATA_PTR;
int arch_reserve_stacks(void)
{
#ifdef CONFIG_SPL_BUILD
gd->start_addr_sp -= 128; /* leave 32 words for abort-stack */
gd->irq_sp = gd->start_addr_sp;
#else
/* setup stack pointer for exceptions */
gd->irq_sp = gd->start_addr_sp;
# if !defined(CONFIG_ARM64)
/* leave 3 words for abort-stack, plus 1 for alignment */
gd->start_addr_sp -= 16;
# endif
#endif
return 0;
}