thanks! David, I have solved the problem! Ola, Ola ,Ola ......^O^ --- David Woodhouse wrote: >it'll be controlled by a GPIO pin somewhere. That would be board-specific. it doesnt controlled by a GPIO,but just like that, its be controlled by a TC(traffic controller), no introduction about it in the document. But finally I beat the problem. thank you for your help very much! Jim Zeus(survivor from the problem) _____________________________________________________________ Want a new web-based email account ? ---> http://www.firstlinux.net _____________________________________________________________ Run a small business? Then you need professional email like you@yourbiz.com from Everyone.net http://www.everyone.net?tag