Index: linux-2.6.21-rc1/drivers/ide/pci/siimage.c
===================================================================
--- linux-2.6.21-rc1.orig/drivers/ide/pci/siimage.c	2007-02-26 04:43:04.000000000 +0100
+++ linux-2.6.21-rc1/drivers/ide/pci/siimage.c	2007-02-26 04:45:01.000000000 +0100
@@ -50,6 +50,7 @@
 	switch(pdev->device)
 	{
 		case PCI_DEVICE_ID_SII_3112:
+		case PCI_DEVICE_ID_SII_3512:
 		case PCI_DEVICE_ID_SII_1210SA:
 			return 1;
 		case PCI_DEVICE_ID_SII_680:
@@ -1050,7 +1051,8 @@
 static ide_pci_device_t siimage_chipsets[] __devinitdata = {
 	/* 0 */ DECLARE_SII_DEV("SiI680"),
 	/* 1 */ DECLARE_SII_DEV("SiI3112 Serial ATA"),
-	/* 2 */ DECLARE_SII_DEV("Adaptec AAR-1210SA")
+	/* 2 */ DECLARE_SII_DEV("Adaptec AAR-1210SA"),
+	/* 3 */ DECLARE_SII_DEV("SiI3512 Serial ATA")
 };
 
 /**
@@ -1072,6 +1074,7 @@
 #ifdef CONFIG_BLK_DEV_IDE_SATA
 	{ PCI_VENDOR_ID_CMD, PCI_DEVICE_ID_SII_3112, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 1},
 	{ PCI_VENDOR_ID_CMD, PCI_DEVICE_ID_SII_1210SA, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 2},
+	{ PCI_VENDOR_ID_CMD, PCI_DEVICE_ID_SII_3512, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 3},
 #endif
 	{ 0, },
 };
Index: linux-2.6.21-rc1/include/linux/pci_ids.h
===================================================================
--- linux-2.6.21-rc1.orig/include/linux/pci_ids.h	2007-02-26 04:43:04.000000000 +0100
+++ linux-2.6.21-rc1/include/linux/pci_ids.h	2007-02-26 04:46:14.000000000 +0100
@@ -932,6 +932,7 @@
 #define PCI_DEVICE_ID_SII_680		0x0680
 #define PCI_DEVICE_ID_SII_3112		0x3112
 #define PCI_DEVICE_ID_SII_1210SA	0x0240
+#define PCI_DEVICE_ID_SII_3512		0x3512
 
 
 #define PCI_VENDOR_ID_BROOKTREE		0x109e