diff -cur ata.ORG/ata-chipset.c ata/ata-chipset.c
--- ata.ORG/ata-chipset.c	2007-11-09 10:12:31.000000000 +0900
+++ ata/ata-chipset.c	2007-11-15 15:27:54.000000000 +0900
@@ -1255,6 +1255,8 @@
      { ATA_ATI_IXP300_S1, 0x00, SIIMEMIO, 0, ATA_SA150, "IXP300" },
      { ATA_ATI_IXP400_S1, 0x00, SIIMEMIO, 0, ATA_SA150, "IXP400" },
      { ATA_ATI_IXP400_S2, 0x00, SIIMEMIO, 0, ATA_SA150, "IXP400" },
+     { ATA_ATI_IXP600,    0x00, 0,        0, ATA_UDMA6, "IXP600" }, 
+     { ATA_ATI_IXP600_S1, 0x00, 0,        0, ATA_SA300, "IXP600" }, 
      { 0, 0, 0, 0, 0, 0}};
     char buffer[64];
 
@@ -1282,7 +1284,20 @@
     if (ata_setup_interrupt(dev))
 	return ENXIO;
 
-    ctlr->setmode = ata_ati_setmode;
+    /* ATI IXP SB600 Serial ATA is actually an AHCI compatible controller */ 
+    if (ctlr->chip->chipid == ATA_ATI_IXP600_S1) { 
+	ctlr->r_type2 = SYS_RES_MEMORY; 
+	ctlr->r_rid2 = PCIR_BAR(5); 
+	if ((ctlr->r_res2 = bus_alloc_resource_any(dev, ctlr->r_type2, 
+				   &ctlr->r_rid2, RF_ACTIVE))) { 
+	return ata_ahci_chipinit(dev); 
+	} 
+	else 
+	  return ENXIO; 
+    } 
+    else 
+	ctlr->setmode = ata_ati_setmode; 
+
     return 0;
 }
 
diff -cur ata.ORG/ata-pci.h ata/ata-pci.h
--- ata.ORG/ata-pci.h	2007-11-09 10:12:31.000000000 +0900
+++ ata/ata-pci.h	2007-11-15 15:23:00.000000000 +0900
@@ -103,6 +103,8 @@
 #define ATA_ATI_IXP300_S1       0x436e1002
 #define ATA_ATI_IXP400_S1       0x43791002
 #define ATA_ATI_IXP400_S2       0x437a1002
+#define ATA_ATI_IXP600_S1       0x43801002 
+#define ATA_ATI_IXP600          0x438c1002 
 
 #define ATA_CENATEK_ID          0x16ca
 #define ATA_CENATEK_ROCKET      0x000116ca