diff --git a/src/chipset/via_apollo.c b/src/chipset/via_apollo.c
index 7c1203c3a..20e2c7f74 100644
--- a/src/chipset/via_apollo.c
+++ b/src/chipset/via_apollo.c
@@ -444,7 +444,7 @@ via_apollo_host_bridge_write(int func, int addr, uint8_t val, void *priv)
                         apollo_smram_map(dev, 0, 0x000a0000, 0x00020000, 0);
                         break;
                 }
-            else
+            else if (dev->id == VIA_595)
                 switch (val & 0x03) {
                     case 0x00:
                         apollo_smram_map(dev, 1, 0x000a0000, 0x00020000, 0);
@@ -468,6 +468,12 @@ via_apollo_host_bridge_write(int func, int addr, uint8_t val, void *priv)
                     default:
                         break;
                 }
+            else {
+                smram_enable(dev->smram, 0x000a0000, 0x000a0000, 0x00020000,
+                             (dev->pci_conf[0x6d] & 0x10) && (dev->pci_conf[0x63] & 0x01),
+                             dev->pci_conf[0x63] & 0x01);
+                flushmmucache();
+            }
             break;
         case 0x65:
             if (dev->id == VIA_585)
@@ -532,6 +538,13 @@ via_apollo_host_bridge_write(int func, int addr, uint8_t val, void *priv)
                 dev->pci_conf[0x6d] = (dev->pci_conf[0x6d] & ~0x7f) | (val & 0x7f);
             else
                 dev->pci_conf[0x6d] = val;
+            if (dev->id == VIA_585) {
+                smram_disable_all();
+                smram_enable(dev->smram, 0x000a0000, 0x000a0000, 0x00020000,
+                             (dev->pci_conf[0x6d] & 0x10) && (dev->pci_conf[0x63] & 0x01),
+                             dev->pci_conf[0x63] & 0x01);
+                flushmmucache();
+            }
             break;
         case 0x6e:
             if ((dev->id == VIA_595) || (dev->id == VIA_694))