diff --git a/README b/README
index cf3867d..246ae2b 100644
--- a/README
+++ b/README
@@ -858,9 +858,13 @@
 		MPC5200 USB requires additional defines:
 			CONFIG_USB_CLOCK
 				for 528 MHz Clock: 0x0001bbbb
+			CONFIG_PSC3_USB
+				for USB on PSC3
 			CONFIG_USB_CONFIG
 				for differential drivers: 0x00001000
 				for single ended drivers: 0x00005000
+				for differential drivers on PSC3: 0x00000100
+				for single ended drivers on PSC3: 0x00004100
 			CONFIG_SYS_USB_EVENT_POLL
 				May be defined to allow interrupt polling
 				instead of using asynchronous interrupts
diff --git a/cpu/mpc5xxx/usb.c b/cpu/mpc5xxx/usb.c
index 8f2b66a..bec7da3 100644
--- a/cpu/mpc5xxx/usb.c
+++ b/cpu/mpc5xxx/usb.c
@@ -32,9 +32,13 @@
 	/* Set the USB Clock						     */
 	*(vu_long *)MPC5XXX_CDM_48_FDC = CONFIG_USB_CLOCK;
 
+#ifdef CONFIG_PSC3_USB /* USB is using the alternate configuration */
+	/* remove all PSC3 USB bits first before ORing in ours */
+	*(vu_long *)MPC5XXX_GPS_PORT_CONFIG &= ~0x00804f00;
+#else
 	/* remove all USB bits first before ORing in ours */
 	*(vu_long *)MPC5XXX_GPS_PORT_CONFIG &= ~0x00807000;
-
+#endif
 	/* Activate USB port						     */
 	*(vu_long *)MPC5XXX_GPS_PORT_CONFIG |= CONFIG_USB_CONFIG;
 
diff --git a/cpu/mpc5xxx/usb_ohci.c b/cpu/mpc5xxx/usb_ohci.c
index 61a4e3f..66a4af8 100644
--- a/cpu/mpc5xxx/usb_ohci.c
+++ b/cpu/mpc5xxx/usb_ohci.c
@@ -1576,9 +1576,13 @@
 	/* Set the USB Clock						     */
 	*(vu_long *)MPC5XXX_CDM_48_FDC = CONFIG_USB_CLOCK;
 
+#ifdef CONFIG_PSC3_USB /* USB is using the alternate configuration */
+	/* remove all PSC3 USB bits first before ORing in ours */
+	*(vu_long *)MPC5XXX_GPS_PORT_CONFIG &= ~0x00804f00;
+#else
 	/* remove all USB bits first before ORing in ours */
 	*(vu_long *)MPC5XXX_GPS_PORT_CONFIG &= ~0x00807000;
-
+#endif
 	/* Activate USB port						     */
 	*(vu_long *)MPC5XXX_GPS_PORT_CONFIG |= CONFIG_USB_CONFIG;