spd_util.c

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/* SPDX-License-Identifier: GPL-2.0-only */
 
#include <console/console.h>
#include <mainboard/google/cyan/spd/spd_util.h>
 
/*
 * RAMID3 -1: Dual channel SKU, 0: Single channel SKU
 * 0b0010 - 2GiB total - 1 x 2GiB Micron  EDF8132A3MA-GD-F-R    1600MHz
 * 0b0011 - 2GiB total - 1 x 2GiB Micron  MT52L256M32D1PF-107WT 1866MHz
 * 0b0100 - 2GiB total - 1 x 2GiB Samsung K4E8E304EE-EGCE       1600MHz
 * 0b0101 - 2GiB total - 1 x 2GiB Samsung K4E8E324EB-EGCF       1866MHz
 *
 * 0b1010 - 4GiB total - 2 x 2GiB Micron  EDF8132A3MA-GD-F-R    1600MHz
 * 0b1011 - 4GiB total - 2 x 2GiB Micron  MT52L256M32D1PF-107WT 1866MHz
 * 0b1100 - 4GiB total - 2 x 2GiB Samsung K4E8E304EE-EGCE       1600MHz
 * 0b1101 - 4GiB total - 2 x 2GiB Samsung K4E8E324EB-EGCF       1866MHz
 */
 
int get_variant_spd_index(int ram_id, int *dual)
{
        int spd_index = ram_id & 0x03;
 
        /* Determine if single or dual channel memory system */
        /* RAMID3 is deterministic for terra */
        *dual = ((ram_id >> 3) & 0x1) ? 1 : 0;
 
        /* Display the RAM type */
        printk(BIOS_DEBUG, *dual ? "4GiB " : "2GiB ");
        switch (spd_index) {
        case 0:
                printk(BIOS_DEBUG, "Samsung K4E8E304EE-EGCE 1600MHz\n");
                break;
        case 1:
                printk(BIOS_DEBUG, "Samsung K4E8E324EB-EGCF 1866MHz\n");
                break;
        case 2:
                printk(BIOS_DEBUG, "Micron EDF8132A3MA-GD-F-R 1600MHz\n");
                break;
        case 3:
                printk(BIOS_DEBUG, "Micron MT52L256M32D1PF-107WT 1866MHz\n");
                break;
        }
 
        return spd_index;
}