unable to enumerate USB device on port 1

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友善mini2440 烧写uboot文件后，通过U盘少侠内核文件，

Please press Enter to activate this console.

[root@FriendlyARM /]# 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

解决方法：用超级终端通过JLink链接，重启开发板后终端上出现系统启动倒计时 5，4,3,2.。。。在倒计时前完成之前按回车键进入u_boot命令系统下，开始使用U盘进行内核文件的烧写。

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