mirror of
https://github.com/brain-hackers/u-boot-brain
synced 2024-06-09 23:36:03 +09:00
0f2cbe3f5e
Also adds helper functions for DDR1/2 to verify the checksum. Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
62 lines
1.2 KiB
C
62 lines
1.2 KiB
C
/*
|
|
* 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>
|
|
|
|
/* used for ddr1 and ddr2 spd */
|
|
static int
|
|
spd_check(const u8 *buf, u8 spd_rev, u8 spd_cksum)
|
|
{
|
|
unsigned int cksum = 0;
|
|
unsigned int i;
|
|
|
|
/*
|
|
* Check SPD revision supported
|
|
* Rev 1.2 or less supported by this code
|
|
*/
|
|
if (spd_rev > 0x12) {
|
|
printf("SPD revision %02X not supported by this code\n",
|
|
spd_rev);
|
|
return 1;
|
|
}
|
|
|
|
/*
|
|
* Calculate checksum
|
|
*/
|
|
for (i = 0; i < 63; i++) {
|
|
cksum += *buf++;
|
|
}
|
|
cksum &= 0xFF;
|
|
|
|
if (cksum != spd_cksum) {
|
|
printf("SPD checksum unexpected. "
|
|
"Checksum in SPD = %02X, computed SPD = %02X\n",
|
|
spd_cksum, cksum);
|
|
return 1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
unsigned int
|
|
ddr1_spd_check(const ddr1_spd_eeprom_t *spd)
|
|
{
|
|
const u8 *p = (const u8 *)spd;
|
|
|
|
return spd_check(p, spd->spd_rev, spd->cksum);
|
|
}
|
|
|
|
unsigned int
|
|
ddr2_spd_check(const ddr2_spd_eeprom_t *spd)
|
|
{
|
|
const u8 *p = (const u8 *)spd;
|
|
|
|
return spd_check(p, spd->spd_rev, spd->cksum);
|
|
}
|