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
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
|
/*
* This file is part of the coreboot project.
*
* Copyright (C) 2013 Google Inc.
* Copyright (C) 2015 Intel Corp.
* Copyright (C) 2017 Matt DeVillier
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <console/console.h>
#include <gpio.h>
#include <soc/gpio.h>
#include <mainboard/google/cyan/spd/spd_util.h>
/*
* Usage of RAMID straps
*
* RAMID1 - Single/Dual channel configuration
* 0 - Dual channel, 1 - Single channel
*
* Combination of RAMID3, RAMID2, RAMID0 - Index of SPD table
* Index 0 - Samsung K4E8E304EE-EGCE 1600MHz 23nm
* Index 1 - Samsung K4E8E324EB-EGCF 1866MHz 20nm
*/
uint8_t get_ramid(void)
{
gpio_t spd_gpios[] = {
GP_SW_80, /* SATA_GP3,RAMID0 */
GP_SE_02, /* MF_PLT_CLK1, RAMID2 */
GP_SW_64, /* I2C3_SDA RAMID3 */
GP_SW_67, /* I2C3_SCL,RAMID1 */
};
return gpio_base2_value(spd_gpios, ARRAY_SIZE(spd_gpios));
}
int get_variant_spd_index(int ram_id, int *dual)
{
int spd_index = ram_id & 0x7;
/* Determine if single or dual channel memory system */
/* RAMID3 is deterministic for celes */
*dual = ((ram_id > 3) & 0x1) ? 0 : 1;
/* Display the RAM type */
printk(BIOS_DEBUG, dual ? "4GiB " : "2GiB ");
switch (spd_index) {
case 0:
printk(BIOS_DEBUG, "Samsung K4E8E304EE-EGCE\n");
break;
case 1:
printk(BIOS_DEBUG, "Samsung K4E8E324EB-EGCF\n");
break;
}
return spd_index;
}
|
