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/include/tables_csum.h

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/* SPDX-License-Identifier: GPL-2.0+ */
/*
* Copyright (C) 2015, Bin Meng <bmeng.cn@gmail.com>
*/
#ifndef _TABLES_CSUM_H_
#define _TABLES_CSUM_H_
static inline 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;
}
#endif