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-rw-r--r--src/soc/intel/skylake/memmap.c6
1 files changed, 4 insertions, 2 deletions
diff --git a/src/soc/intel/skylake/memmap.c b/src/soc/intel/skylake/memmap.c
index 96debfd53f..17dbc320c6 100644
--- a/src/soc/intel/skylake/memmap.c
+++ b/src/soc/intel/skylake/memmap.c
@@ -150,7 +150,8 @@ u32 top_of_32bit_ram(void)
* PRMMR_BASE MSR. The system hangs if PRMRR_BASE MSR is read before
* PRMRR_MASK MSR lock bit is set.
*/
- if (smm_region_start() == 0)
+ top_of_ram = smm_region_start();
+ if (top_of_ram == 0)
return 0;
dev = dev_find_slot(0, PCI_DEVFN(SA_DEV_SLOT_ROOT, 0));
@@ -163,7 +164,8 @@ u32 top_of_32bit_ram(void)
* Refer to Fsp Integration Guide for the memory mapping layout.
*/
prmrr_base = rdmsr(UNCORE_PRMRR_PHYS_BASE_MSR);
- top_of_ram = prmrr_base.lo;
+ if (prmrr_base.lo)
+ top_of_ram = prmrr_base.lo;
if (config->ProbelessTrace)
top_of_ram -= TRACE_MEMORY_SIZE;