On Fri, Jul 17, 2009 at 09:00:07AM +0800, liu.yaojin@zte.com.cn wrote: > forget it ,because i have the same problem,and nobody answer. To get an answer, it usually helps: 1) to use a recent kernel 2) to use a vanilla kernel If this is not possible for you, you should ask the makers of your kernel. Regards, Wolfram -- Pengutronix e.K. | Wolfram Sang | Industrial Linux Solutions | http://www.pengutronix.de/ | Peiner Str. 6-8, 31137 Hildesheim, Germany | Phone: +49-5121-206917-5064 | Amtsgericht Hildesheim, HRA 2686 | Fax: +49-5121-206917-5555 |