csu3_am335x/board-support/u-boot-2017.01+gitAUTOINC+340fb36f04-g340fb36f04/lib/tables_csum.c

/*
 * Copyright (C) 2015, Bin Meng <bmeng.cn@gmail.com>
 *
 * SPDX-License-Identifier:	GPL-2.0+
 */

#include <common.h>
#include <linux/ctype.h>

u8 table_compute_checksum(void *v, int len)
{
	u8 *bytes = v;
	u8 checksum = 0;
	int i;

	for (i = 0; i < len; i++)
		checksum -= bytes[i];

	return checksum;
}