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/xtensa/lib/relocate.c

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/*
* Copyright (C) 2016 Cadence Design Systems Inc.
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <relocate.h>
#include <asm/sections.h>
#include <asm/string.h>
int clear_bss(void)
{
size_t len = (size_t)&__bss_end - (size_t)&__bss_start;
memset((void *)&__bss_start, 0x00, len);
return 0;
}