blob: c8b73ff56cf8874f9a518f099da639aaee77ecbe (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
|
/*
* 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 <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;
}
|
