关于国嵌的视频教程实验手册有usb设备驱动之u盘，一步一步按照实验书册配置内核，可是启动内核和NFS文件系统后，插入u盘提示
Processing /etc/profile... Done
插上U盘错误提示：
# usb 1-1: new full speed USB device using s3c2410-ohci and address 6
usb 1-1: device descriptor read/64, error -62
usb 1-1: device descriptor read/64, error -62
usb 1-1: new full speed USB device using s3c2410-ohci and address 7
usb 1-1: device descriptor read/64, error -62
usb 1-1: device descriptor read/64, error -62
usb 1-1: new full speed USB device using s3c2410-ohci and address 8
usb 1-1: device not accepting address 8, error -62
usb 1-1: new full speed USB device using s3c2410-ohci and address 9
usb 1-1: device not accepting address 9, error -62
hub 1-0:1.0: unable to enumerate USB device on port 1
请问是怎么回事？我用的是国嵌提供的实验内核，手册上没有关于程序代码的修改只有内核的可视化配置而已
