diff -ruN linux-2.6.23-rc3.orig/Documentation/i2c/busses/i2c-piix4 linux-2.6.23-rc3/Documentation/i2c/busses/i2c-piix4
--- linux-2.6.23-rc3.orig/Documentation/i2c/busses/i2c-piix4	2007-08-13 12:25:24.000000000 +0800
+++ linux-2.6.23-rc3/Documentation/i2c/busses/i2c-piix4	2007-08-15 08:58:54.000000000 +0800
@@ -6,7 +6,7 @@
     Datasheet: Publicly available at the Intel website
   * ServerWorks OSB4, CSB5, CSB6 and HT-1000 southbridges
     Datasheet: Only available via NDA from ServerWorks
-  * ATI IXP200, IXP300, IXP400, SB600 and SB700 southbridges
+  * ATI IXP200, IXP300, IXP400, SB600, SB700 and SB800 southbridges
     Datasheet: Not publicly available
   * Standard Microsystems (SMSC) SLC90E66 (Victory66) southbridge
     Datasheet: Publicly available at the SMSC website http://www.smsc.com
diff -ruN linux-2.6.23-rc3.orig/drivers/i2c/busses/i2c-piix4.c linux-2.6.23-rc3/drivers/i2c/busses/i2c-piix4.c
--- linux-2.6.23-rc3.orig/drivers/i2c/busses/i2c-piix4.c	2007-08-13 12:25:24.000000000 +0800
+++ linux-2.6.23-rc3/drivers/i2c/busses/i2c-piix4.c	2007-08-15 09:00:30.000000000 +0800
@@ -23,7 +23,7 @@
    Supports:
 	Intel PIIX4, 440MX
 	Serverworks OSB4, CSB5, CSB6, HT-1000
-	ATI IXP200, IXP300, IXP400, SB600, SB700
+	ATI IXP200, IXP300, IXP400, SB600, SB700, SB800
 	SMSC Victory66
 
    Note: we assume there can only be one device, with one SMBus interface.
@@ -397,9 +397,7 @@
 	  .driver_data = 0 },
 	{ PCI_DEVICE(PCI_VENDOR_ID_ATI, PCI_DEVICE_ID_ATI_IXP400_SMBUS),
 	  .driver_data = 0 },
-	{ PCI_DEVICE(PCI_VENDOR_ID_ATI, PCI_DEVICE_ID_ATI_IXP600_SMBUS),
-	  .driver_data = 0 },
-	{ PCI_DEVICE(PCI_VENDOR_ID_ATI, PCI_DEVICE_ID_ATI_IXP700_SMBUS),
+	{ PCI_DEVICE(PCI_VENDOR_ID_ATI, PCI_DEVICE_ID_ATI_SBX00_SMBUS),
 	  .driver_data = 0 },
 	{ PCI_DEVICE(PCI_VENDOR_ID_SERVERWORKS, PCI_DEVICE_ID_SERVERWORKS_OSB4),
 	  .driver_data = 0 },
diff -ruN linux-2.6.23-rc3.orig/drivers/i2c/busses/Kconfig linux-2.6.23-rc3/drivers/i2c/busses/Kconfig
--- linux-2.6.23-rc3.orig/drivers/i2c/busses/Kconfig	2007-08-13 12:25:24.000000000 +0800
+++ linux-2.6.23-rc3/drivers/i2c/busses/Kconfig	2007-08-15 08:59:48.000000000 +0800
@@ -208,6 +208,7 @@
 	    ATI IXP400
 	    ATI SB600
 	    ATI SB700
+	    ATI SB800
 	    Serverworks OSB4
 	    Serverworks CSB5
 	    Serverworks CSB6
diff -ruN linux-2.6.23-rc3.orig/include/linux/pci_ids.h linux-2.6.23-rc3/include/linux/pci_ids.h
--- linux-2.6.23-rc3.orig/include/linux/pci_ids.h	2007-08-13 12:25:24.000000000 +0800
+++ linux-2.6.23-rc3/include/linux/pci_ids.h	2007-08-15 09:00:40.000000000 +0800
@@ -371,10 +371,9 @@
 #define PCI_DEVICE_ID_ATI_IXP400_SATA   0x4379
 #define PCI_DEVICE_ID_ATI_IXP400_SATA2	0x437a
 #define PCI_DEVICE_ID_ATI_IXP600_SATA	0x4380
-#define PCI_DEVICE_ID_ATI_IXP600_SMBUS	0x4385
+#define PCI_DEVICE_ID_ATI_SBX00_SMBUS	0x4385
 #define PCI_DEVICE_ID_ATI_IXP600_IDE	0x438c
 #define PCI_DEVICE_ID_ATI_IXP700_SATA	0x4390
-#define PCI_DEVICE_ID_ATI_IXP700_SMBUS	0x4395
 #define PCI_DEVICE_ID_ATI_IXP700_IDE	0x439c
 
 #define PCI_VENDOR_ID_VLSI		0x1004