diff --git a/kernel/busses/i2c-sis645.c b/kernel/busses/i2c-sis645.c
index baf786e1..73c73c95 100644
--- a/kernel/busses/i2c-sis645.c
+++ b/kernel/busses/i2c-sis645.c
@@ -50,21 +50,31 @@
 
 #define DRV_NAME "i2c-sis645"
 
-/* SiS645DX north bridge */
+/* SiS645DX north bridge (defined in 2.4.21) */
 #ifndef PCI_DEVICE_ID_SI_646
 #define PCI_DEVICE_ID_SI_646 0x0646
 #endif
 
-/* SiS648 north bridge */
+/* SiS648 north bridge (defined in 2.4.21) */
 #ifndef PCI_DEVICE_ID_SI_648
 #define PCI_DEVICE_ID_SI_648 0x0648
 #endif
 
-/* SiS651 north bridge */
+/* SiS650 north bridge (defined in 2.4.19) */
+#ifndef PCI_DEVICE_ID_SI_650
+#define PCI_DEVICE_ID_SI_650 0x0650
+#endif
+
+/* SiS651 north bridge (defined in 2.4.21)*/
 #ifndef PCI_DEVICE_ID_SI_651
 #define PCI_DEVICE_ID_SI_651 0x0651
 #endif
 
+/* SiS746 north bridge (defined in 2.4.21) */
+#ifndef PCI_DEVICE_ID_SI_746
+#define PCI_DEVICE_ID_SI_746 0x0746
+#endif
+
 /* SiS85C503/5513 (LPC Bridge) */
 #ifndef PCI_DEVICE_ID_SI_LPC
 #define PCI_DEVICE_ID_SI_LPC 0x0018
@@ -85,7 +95,10 @@
 #define PCI_DEVICE_ID_SI_963 0x0963
 #endif
 
+/* SMBus ID */
+#ifndef PCI_DEVICE_ID_SI_SMBUS
 #define PCI_DEVICE_ID_SI_SMBUS 0x16
+#endif
 
 /* base address register in PCI config space */
 #define SIS645_BAR 0x04