When I use the newest XhciDxe driver in Phytium Platform( ARM) ,&nbsp; I found if clearing &ldquo;Input Context&rdquo;&nbsp;in XhcEvaluateContext64(), the usb KB doesn't work, and mark the&nbsp; code&nbsp;&nbsp;&nbsp;ZeroMem (InputContext, sizeof (INPUT_CONTEXT_64)); &nbsp;it works.&nbsp;<br />I viewed the code again, maybe change the ZeroMem (InputContext, sizeof (INPUT_CONTEXT_64)); to ZeroMem (InputContext, sizeof (INPUT_CONTRL_CONTEXT_64)); is more resonable.&nbsp; Because when clearing the INPUT_CONTEXT_64, the Slot context and the endpoint context are cleared too. But according the xHCI Spec section 6.2.2&nbsp;<br />Note：Unless otherwise stated: As Input, all fields of the Slot Context shall be initialized to the appropriate value by software before issuing a command.<br />And I test again, just clear INPUT_CONTRL_CONTEXT_64 is OK.<br />