用的是am3517处理器，是北京瑞泰（TI的代理商）的ICETEK-AM3517-KB-EZ。关于usb接鼠标要接个HUB才能用，而不能直接在USB接口直接插鼠标。而想周立功的开发板上的鼠标不需要接HUB，可以直接接在USB口上使用。如果直接接鼠标，提示错误：
hub 1-0:1.0: Cannot enable port 1. Maybe the USB cable is bad?
hub 1-0:1.0: Cannot enable port 1. Maybe the USB cable is bad?
hub 1-0:1.0: Cannot enable port 1. Maybe the USB cable is bad?
hub 1-0:1.0: Cannot enable port 1. Maybe the USB cable is bad?
hub 1-0:1.0: unable to enumerate USB device on port 1
