diff --git a/src/soc/intel/baytrail/acpi.c b/src/soc/intel/baytrail/acpi.c
index 84d125a19a..b50b12e07d 100644
--- a/src/soc/intel/baytrail/acpi.c
+++ b/src/soc/intel/baytrail/acpi.c
@@ -56,3 +56,10 @@ void acpi_create_intel_hpet(acpi_hpet_t * hpet)
 	header->checksum =
 	    acpi_checksum((void *) hpet, sizeof(acpi_hpet_t));
 }
+
+unsigned long acpi_fill_mcfg(unsigned long current)
+{
+	current += acpi_create_mcfg_mmconfig((acpi_mcfg_mmconfig_t *)current,
+					     MCFG_BASE_ADDRESS, 0, 0, 255);
+	return current;
+}
diff --git a/src/soc/intel/baytrail/placeholders.c b/src/soc/intel/baytrail/placeholders.c
index 5267927876..b10b7e69f8 100644
--- a/src/soc/intel/baytrail/placeholders.c
+++ b/src/soc/intel/baytrail/placeholders.c
@@ -7,8 +7,6 @@
 
 void generate_cpu_entries(void) {}
 
-unsigned long acpi_fill_mcfg(unsigned long current) { return current; }
-
 void smm_init(void) {}
 
 /* Rmodules don't like weak symbols. */