coreboot
coreboot is an Open Source project aimed at replacing the proprietary BIOS found in most computers.
spd_util.c
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1 /* SPDX-License-Identifier: GPL-2.0-only */
2 
3 #include <console/console.h>
4 #include <mainboard/google/cyan/spd/spd_util.h>
5 
6 /*
7  * 0b0000 - 4GiB total - 2 x 2GiB Samsung K4E8E304EE-EGCE
8  * 0b0001 - 4GiB total - 2 x 2GiB Hynix H9CCNNN8JTBLAR-NUD
9  * 0b0010 - 2GiB total - 1 x 2GiB Samsung K4E8E304EE-EGCE
10  * 0b0011 - 2GiB total - 1 x 2GiB Hynix H9CCNNN8JTBLAR-NUD
11  * 0b0100 - 8GiB total - 2 x 4GiB Samsung K4E8E324EB-EGCF (dual)
12  * 0b0101 - 4GiB total - 2 x 2GiB Micron LPDDR3 MT52L256M32D1PF-107 (dual)
13  * 0b0110 - 4GiB total - 1 x 4GiB Samsung K4E8E324EB-EGCF
14  * 0b0111 - 2GiB total - 1 x 2GiB Micron LPDDR3 MT52L256M32D1PF-107
15  * 0b1000 - 4GiB total - 2 x 2GiB NANYA NT6CL256T32CM-H1 (dual)
16  * 0b1001 - 4GiB total - 2 x 2GiB Hynix H9CCNNN8GTALAR-NUD (dual)
17  * 0b1010 - 2GiB total - 1 x 2GiB NANYA NT6CL256T32CM-H1
18  * 0b1011 - 2GiB total - 1 x 2GiB Hynix H9CCNNN8GTALAR-NUD
19  */
20 
21 int get_variant_spd_index(int ram_id, int *dual)
22 {
23  /* Determine if single or dual channel memory system */
24  /* RAMID1 is deterministic for edgar */
25  *dual = ((ram_id >> 1) & 0x1) ? 0 : 1;
26 
27  /* Display the RAM type */
28  switch (ram_id) {
29  case 0:
30  printk(BIOS_DEBUG, "4GiB Samsung K4E8E304EE-EGCE\n");
31  break;
32  case 1:
33  printk(BIOS_DEBUG, "4GiB Hynix H9CCNNN8JTBLAR-NUD\n");
34  break;
35  case 2:
36  printk(BIOS_DEBUG, "2GiB Samsung K4E8E304EE-EGCE\n");
37  break;
38  case 3:
39  printk(BIOS_DEBUG, "2GiB Hynix H9CCNNN8JTBLAR-NUD\n");
40  break;
41  case 4:
42  printk(BIOS_DEBUG, "4GiB Samsung K4E8E324EB-EGCF\n");
43  break;
44  case 5:
45  printk(BIOS_DEBUG, "4GiB Micron LPDDR3 MT52L256M32D1PF-107\n");
46  break;
47  case 6:
48  printk(BIOS_DEBUG, "2GiB Samsung K4E8E324EB-EGCF\n");
49  break;
50  case 7:
51  printk(BIOS_DEBUG, "2GiB Micron LPDDR3 MT52L256M32D1PF-107\n");
52  break;
53  case 8:
54  printk(BIOS_DEBUG, "4GiB NANYA NT6CL256T32CM-H1\n");
55  break;
56  case 9:
57  printk(BIOS_DEBUG, "4GiB Hynix H9CCNNN8GTALAR-NUD\n");
58  break;
59  case 10:
60  printk(BIOS_DEBUG, "2GiB NANYA NT6CL256T32CM-H1\n");
61  break;
62  case 11:
63  printk(BIOS_DEBUG, "2GiB Hynix H9CCNNN8GTALAR-NUD\n");
64  break;
65  }
66 
67  /* 1:1 mapping between ram_id and spd_index for edgar */
68  return ram_id;
69 }
printk
#define printk(level,...)
Definition: stdlib.h:16
spd_util.h
get_variant_spd_index
int get_variant_spd_index(int ram_id, int *dual)
Definition: spd_util.c:21
BIOS_DEBUG
#define BIOS_DEBUG
BIOS_DEBUG - Verbose output.
Definition: loglevel.h:128