diff --git a/src/southbridge/amd/sb700/sb700_ide.c b/src/southbridge/amd/sb700/sb700_ide.c
index 88d634bebb..4652ca2539 100644
--- a/src/southbridge/amd/sb700/sb700_ide.c
+++ b/src/southbridge/amd/sb700/sb700_ide.c
@@ -51,10 +51,13 @@ static void ide_init(struct device *dev)
 
 	/* set ide as primary, if you want to boot from IDE, you'd better set it
 	 * in $vendor/$mainboard/devicetree.cb */
+	 
+	
 	if (conf->boot_switch_sata_ide == 1) {
-		byte = pci_read_config8(dev, 0xAD);
+		struct device *sm_dev = dev_find_slot(0, PCI_DEVFN(0x14, 0));
+		byte = pci_read_config8(sm_dev, 0xAD);
 		byte |= 1 << 4;
-		pci_write_config8(dev, 0xAD, byte);
+		pci_write_config8(sm_dev, 0xAD, byte);
 	}
 
 #if CONFIG_PCI_ROM_RUN == 1