diff --git a/src/southbridge/amd/agesa/hudson/lpc.c b/src/southbridge/amd/agesa/hudson/lpc.c
index f811302e0c..b80bb6ad35 100644
--- a/src/southbridge/amd/agesa/hudson/lpc.c
+++ b/src/southbridge/amd/agesa/hudson/lpc.c
@@ -320,7 +320,9 @@ static const char *lpc_acpi_name(const struct device *dev)
 
 unsigned long acpi_fill_mcfg(unsigned long current)
 {
-	/* Just a dummy */
+	current += acpi_create_mcfg_mmconfig((acpi_mcfg_mmconfig_t *)current,
+			CONFIG_MMCONF_BASE_ADDRESS, 0, 0, CONFIG_MMCONF_BUS_NUMBER - 1);
+
 	return current;
 }
 
diff --git a/src/southbridge/amd/cimx/sb800/late.c b/src/southbridge/amd/cimx/sb800/late.c
index 15e6d67c0c..9fdf596cbd 100644
--- a/src/southbridge/amd/cimx/sb800/late.c
+++ b/src/southbridge/amd/cimx/sb800/late.c
@@ -123,7 +123,9 @@ static void lpc_init(struct device *dev)
 
 unsigned long acpi_fill_mcfg(unsigned long current)
 {
-	/* Just a dummy */
+	current += acpi_create_mcfg_mmconfig((acpi_mcfg_mmconfig_t *)current,
+			CONFIG_MMCONF_BASE_ADDRESS, 0, 0, CONFIG_MMCONF_BUS_NUMBER - 1);
+
 	return current;
 }