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/*
* Copyright 2008 Freescale Semiconductor, Inc.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* Version 2 as published by the Free Software Foundation.
*/
#include <common.h>
#include <crc.h>
#include <ddr_spd.h>
uint32_t ddr2_spd_checksum_pass(const struct ddr2_spd_eeprom_s *spd)
{
uint32_t i, cksum = 0;
const uint8_t *buf = (const uint8_t *)spd;
uint8_t rev, spd_cksum;
rev = spd->spd_rev;
spd_cksum = spd->cksum;
/* Rev 1.X or less supported by this code */
if (rev >= 0x20)
goto error;
/*
* The checksum is calculated on the first 64 bytes
* of the SPD as per JEDEC specification.
*/
for (i = 0; i < 63; i++)
cksum += *buf++;
cksum &= 0xFF;
if (cksum != spd_cksum)
goto error;
return 0;
error:
return 1;
}
uint32_t ddr3_spd_checksum_pass(const struct ddr3_spd_eeprom_s *spd)
{
char crc_lsb, crc_msb;
int csum16, len;
/*
* SPD byte0[7] - CRC coverage
* 0 = CRC covers bytes 0~125
* 1 = CRC covers bytes 0~116
*/
len = !(spd->info_size_crc & 0x80) ? 126 : 117;
csum16 = cyg_crc16((char *)spd, len);
crc_lsb = (char) (csum16 & 0xff);
crc_msb = (char) (csum16 >> 8);
if (spd->crc[0] != crc_lsb || spd->crc[1] != crc_msb)
return 1;
return 0;
}
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