diff --git a/Ubiquitous/XiZi_AIoT/services/drivers/usb/components/port/xhci/usb_hc_xhci.c b/Ubiquitous/XiZi_AIoT/services/drivers/usb/components/port/xhci/usb_hc_xhci.c
index 51057192c..e23726388 100644
--- a/Ubiquitous/XiZi_AIoT/services/drivers/usb/components/port/xhci/usb_hc_xhci.c
+++ b/Ubiquitous/XiZi_AIoT/services/drivers/usb/components/port/xhci/usb_hc_xhci.c
@@ -535,4 +535,21 @@ void USBH_IRQHandler(void *param)
 	writel (runtime, xhci->run + XHCI_RUN_IR_IMAN ( 0 ));
 
     (void)xhci_event_process(xhci);
-}
\ No newline at end of file
+}
+
+
+/* 
+ * Functions for xHCI drivers. These functions are called by USB core.
+ */
+int xhci_usb_hc_init(uint32_t id){
+    return 0;
+}
+
+
+
+uint16_t xhci_usbh_get_frame_number(void){
+    return 0;
+}
+
+
+