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-rw-r--r--src/northbridge/amd/amdmct/mct_ddr3/mct_d.c22
1 files changed, 21 insertions, 1 deletions
diff --git a/src/northbridge/amd/amdmct/mct_ddr3/mct_d.c b/src/northbridge/amd/amdmct/mct_ddr3/mct_d.c
index 9724008fbf..e1c0d4f563 100644
--- a/src/northbridge/amd/amdmct/mct_ddr3/mct_d.c
+++ b/src/northbridge/amd/amdmct/mct_ddr3/mct_d.c
@@ -254,6 +254,10 @@ static uint8_t dct_ddr_voltage_index(struct DCTStatStruc *pDCTstat, uint8_t dct)
uint8_t dimm;
uint8_t ddr_voltage_index = 0;
+ /* If no DIMMs are present on this DCT, report 1.5V operation and skip checking the hardware */
+ if (pDCTstat->DIMMValidDCT[dct] == 0)
+ return 0x1;
+
/* Find current DDR supply voltage for this DCT */
for (dimm = 0; dimm < MAX_DIMMS_SUPPORTED; dimm++) {
if (pDCTstat->DIMMValidDCT[dct] & (1 << dimm))
@@ -2409,6 +2413,7 @@ static void mctAutoInitMCT_D(struct MCTStatStruc *pMCTstat,
*/
u8 Node, NodesWmem;
u32 node_sys_base;
+ uint8_t dimm;
uint8_t nvram;
uint8_t enable_cc6;
uint8_t allow_config_restore;
@@ -2498,10 +2503,25 @@ restartinit:
nvram = 0;
set_option("allow_spd_nvram_cache_restore", &nvram);
-#if IS_ENABLED(DIMM_VOLTAGE_SET_SUPPORT)
+#if IS_ENABLED(CONFIG_DIMM_VOLTAGE_SET_SUPPORT)
printk(BIOS_DEBUG, "%s: DIMMSetVoltage\n", __func__);
DIMMSetVoltages(pMCTstat, pDCTstatA); /* Set the DIMM voltages (mainboard specific) */
#endif
+ if (!IS_ENABLED(CONFIG_DIMM_VOLTAGE_SET_SUPPORT)) {
+ /* Assume 1.5V operation */
+ for (Node = 0; Node < MAX_NODES_SUPPORTED; Node++) {
+ struct DCTStatStruc *pDCTstat;
+ pDCTstat = pDCTstatA + Node;
+
+ if (!pDCTstat->NodePresent)
+ continue;
+
+ for (dimm = 0; dimm < MAX_DIMMS_SUPPORTED; dimm++) {
+ if (pDCTstat->DIMMValid & (1 << dimm))
+ pDCTstat->DimmConfiguredVoltage[dimm] = 0x1;
+ }
+ }
+ }
/* If DIMM configuration has not changed since last boot restore training values */
allow_config_restore = 1;