hi terry >hi, > >I use the ARM926ejs, it need set the I/O as input, output or other >status. Also it need read the I/O port.And "all IO is memory mapped". >In u-boot how to support this, where to configure it, or it need write >by myself. > In convention u-boot do it in cpu/<you cpu id>/start.S best regards 蔡栋 caidong at kedacom.com 2005-11-29