u-boot/arch/xtensa/lib/relocate.c

// SPDX-License-Identifier: GPL-2.0+
/*
 * Copyright (C) 2016 Cadence Design Systems Inc.
 */

#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;
}