--- src/sys/dev/ata/ata-chipset.c	2007-11-19 20:10:24.000000000 +0100
+++ src/sys/dev/ata/ata-chipset.c	2007-11-19 20:34:51.000000000 +0100
@@ -1788,8 +1788,10 @@
      { ATA_I82801HB_R1,  0, AHCI, 0x00, ATA_SA300, "ICH8" },
      { ATA_I82801HB_AH4, 0, AHCI, 0x00, ATA_SA300, "ICH8" },
      { ATA_I82801HB_AH6, 0, AHCI, 0x00, ATA_SA300, "ICH8" },
-     { ATA_I82801HBM_S1, 0, AHCI, 0x00, ATA_SA300, "ICH8M" },
+     { ATA_I82801HBM_S1, 0,    0, 0x00, ATA_SA150, "ICH8M" },
      { ATA_I82801HBM_S2, 0, AHCI, 0x00, ATA_SA300, "ICH8M" },
+     { ATA_I82801HBM_S3, 0, AHCI, 0x00, ATA_SA300, "ICH8M" },
+     { ATA_I82801HBM,    0,    0, 0x00, ATA_UDMA5, "ICH8M" },
      { ATA_I82801IB_S1,  0, AHCI, 0x00, ATA_SA300, "ICH9" },
      { ATA_I82801IB_S2,  0, AHCI, 0x00, ATA_SA300, "ICH9" },
      { ATA_I82801IB_AH2, 0, AHCI, 0x00, ATA_SA300, "ICH9" },
--- src/sys/dev/ata/ata-pci.h	2007-11-19 20:10:24.000000000 +0100
+++ src/sys/dev/ata/ata-pci.h	2007-11-19 20:34:51.000000000 +0100
@@ -168,8 +168,10 @@
 #define ATA_I82801HB_R1         0x28228086
 #define ATA_I82801HB_AH4        0x28248086
 #define ATA_I82801HB_S2         0x28258086
-#define ATA_I82801HBM_S1        0x28298086
-#define ATA_I82801HBM_S2        0x282a8086
+#define ATA_I82801HBM_S1        0x28288086
+#define ATA_I82801HBM_S2        0x28298086
+#define ATA_I82801HBM_S3        0x282a8086
+#define ATA_I82801HBM           0x28508086
 #define ATA_I82801IB_S1         0x29208086
 #define ATA_I82801IB_AH2        0x29218086
 #define ATA_I82801IB_AH6        0x29228086