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>
 
/* We use RAM_ID3 to indicate dual channel config.
 *
 * 0b0000 - 2GiB total - 1 x 2GiB Samsung K4E8E304EE-EGCF 1600MHz
 * 0b0001 - 2GiB total - 1 x 2GiB Hynix H9CCNNN8GTMLAR-NUD 1600MHz
 * 0b0010 - 2GiB total - 1 x 2GiB Micron EDF8132A3MA-JD-F 1600MHz
 * 0b0011 - 2GiB total - 1 x 2GiB Samsung K4E8E324EB-EGCF 1600MHz
 *
 * 0b1000 - 4GiB total - 2 x 2GiB Samsung K4E8E304EE-EGCF 1600MHz
 * 0b1001 - 4GiB total - 2 x 2GiB Hynix H9CCNNN8GTMLAR-NUD 1600MHz
 * 0b1010 - 4GiB total - 2 x 2GiB Micron EDF8132A3MA-JD-F 1600MHz
 * 0b1011 - 4GiB total - 2 x 2GiB Samsung K4E8E324EB-EGCF 1600MHz
 *
 */
 
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 ultima */
        *dual = !!(ram_id & (1<<3));
 
        /* Display the RAM type */
        printk(BIOS_DEBUG, *dual ? "4GiB " : "2GiB ");
        switch (spd_index) {
        case 0:
                printk(BIOS_DEBUG, "Samsung K4E8E304EE-EGCF\n");
                break;
        case 1:
                printk(BIOS_DEBUG, "Hynix H9CCNNN8GTMLAR-NUD\n");
                break;
        case 2:
                printk(BIOS_DEBUG, "Micron EDF8132A3MA-JD-F\n");
                break;
        case 3:
                printk(BIOS_DEBUG, "Samsung K4E8E324EB-EGCF\n");
                break;
        }
 
        return spd_index;
}