Index: hal/halx86/generic/dma.c
===================================================================
--- hal/halx86/generic/dma.c	(revision 68317)
+++ hal/halx86/generic/dma.c	(working copy)
@@ -142,14 +142,17 @@
     HalpDmaOperations.FreeMapRegisters = (PFREE_MAP_REGISTERS)IoFreeMapRegisters;
     HalpDmaOperations.MapTransfer = (PMAP_TRANSFER)IoMapTransfer;
 
-    /*
-     * Check if Extended DMA is available. We're just going to do a random
-     * read and write.
-     */
-    WRITE_PORT_UCHAR((PUCHAR)FIELD_OFFSET(EISA_CONTROL, DmaController2Pages.Channel2), 0x2A);
-    if (READ_PORT_UCHAR((PUCHAR)FIELD_OFFSET(EISA_CONTROL, DmaController2Pages.Channel2)) == 0x2A)
+    if (HalpBusType == MACHINE_TYPE_EISA)
     {
-        HalpEisaDma = TRUE;
+        /*
+        * Check if Extended DMA is available. We're just going to do a random
+        * read and write.
+        */
+        WRITE_PORT_UCHAR((PUCHAR)FIELD_OFFSET(EISA_CONTROL, DmaController2Pages.Channel2), 0x2A);
+        if (READ_PORT_UCHAR((PUCHAR)FIELD_OFFSET(EISA_CONTROL, DmaController2Pages.Channel2)) == 0x2A)
+        {
+            HalpEisaDma = TRUE;
+        }
     }
 
     /*