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driver/ddr/fsl: Add workaround for faulty SPD

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Some UDIMMs have faulty SPD with wrong mapping for DQ[36-39].
Using raw card spec in case this error is detected.

Signed-off-by: York Sun <yorksun@freescale.com>
This commit is contained in:
York Sun 2014-11-14 17:17:50 -08:00
parent 2892ec5f43
commit 789b3447c0
1 changed files with 22 additions and 0 deletions
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22
drivers/ddr/fsl/ddr4_dimm_params.c
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@ -126,6 +126,12 @@ ddr_compute_dimm_parameters(const generic_spd_eeprom_t *spd,
{ {
unsigned int retval; unsigned int retval;
int i; int i;
const u8 udimm_rc_e_dq[18] = {
0x0c, 0x2c, 0x15, 0x35, 0x15, 0x35, 0x0b, 0x2c, 0x15,
0x35, 0x0b, 0x35, 0x0b, 0x2c, 0x0b, 0x35, 0x15, 0x36
};
int spd_error = 0;
u8 *ptr;
if (spd->mem_type) { if (spd->mem_type) {
if (spd->mem_type != SPD_MEMTYPE_DDR4) { if (spd->mem_type != SPD_MEMTYPE_DDR4) {
@ -179,6 +185,22 @@ ddr_compute_dimm_parameters(const generic_spd_eeprom_t *spd,
/* Unbuffered DIMMs */ /* Unbuffered DIMMs */
if (spd->mod_section.unbuffered.addr_mapping & 0x1) if (spd->mod_section.unbuffered.addr_mapping & 0x1)
pdimm->mirrored_dimm = 1; pdimm->mirrored_dimm = 1;
if ((spd->mod_section.unbuffered.mod_height & 0xe0) == 0 &&
(spd->mod_section.unbuffered.ref_raw_card == 0x04)) {
/* Fix SPD error found on DIMMs with raw card E0 */
for (i = 0; i < 18; i++) {
if (spd->mapping[i] == udimm_rc_e_dq[i])
continue;
spd_error = 1;
debug("SPD byte %d: 0x%x, should be 0x%x\n",
60 + i, spd->mapping[i],
udimm_rc_e_dq[i]);
ptr = (u8 *)&spd->mapping[i];
*ptr = udimm_rc_e_dq[i];
}
if (spd_error)
puts("SPD DQ mapping error fixed\n");
}
break; break;
default: default: