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>
 
/*
 * 0b0000 - 4GiB total - 2 x 2GiB Samsung K4B4G1646Q-HYK0 1600MHz
 * 0b0001 - 4GiB total - 2 x 2GiB Hynix  H5TC4G63CFR-PBA 1600MHz
 * 0b0010 - 2GiB total - 1 x 2GiB Samsung K4B4G1646Q-HYK0 1600MHz
 * 0b0011 - 2GiB total - 1 x 2GiB Hynix  H5TC4G63CFR-PBA 1600MHz
 * 0b0100 - 4GiB total - 2 x 2GiB Samsung K4B4G1646E-BYK0 1600MHz
 * 0b0101 - 4GiB total - 2 x 2GiB Micron MT41K256M16TW-107 1600MHz
 * 0b0110 - 2GiB total - 1 x 2GiB Samsung K4B4G1646E-BYK0 1600MHz
 * 0b0111 - 2GiB total - 1 x 2GiB Micron MT41K256M16TW-107 1600MHz
 */
 
int get_variant_spd_index(int ram_id, int *dual)
{
        /* Determine if single or dual channel memory system */
        /* RAMID1 is deterministic for cyan */
        *dual = ((ram_id >> 1) & 0x1) ? 0 : 1;
 
        /* Display the RAM type */
        switch (ram_id) {
        case 0:
                printk(BIOS_DEBUG, "4GiB Samsung K4B4G1646Q-HYK0 1600MHz\n");
                break;
        case 1:
                printk(BIOS_DEBUG, "4GiB Hynix  H5TC4G63CFR-PBA 1600MHz\n");
                break;
        case 2:
                printk(BIOS_DEBUG, "2GiB Samsung K4B4G1646Q-HYK0 1600MHz\n");
                break;
        case 3:
                printk(BIOS_DEBUG, "2GiB Hynix  H5TC4G63CFR-PBA 1600MHz\n");
                break;
        case 4:
                printk(BIOS_DEBUG, "4GiB Samsung K4B4G1646E-BYK0 1600MHz\n");
                break;
        case 5:
                printk(BIOS_DEBUG, "4GiB Micron MT41K256M16TW-107 1600MHz\n");
                break;
        case 6:
                printk(BIOS_DEBUG, "2GiB Samsung K4B4G1646E-BYK0 1600MHz\n");
                break;
        case 7:
                printk(BIOS_DEBUG, "2GiB Micron MT41K256M16TW-107 1600MHz\n");
                break;
        }
 
        /* 1:1 mapping between ram_id and spd_index for cyan */
        return ram_id;
}