mini2440內核編譯的USB問題，出現usb 1-1: device descriptor read/64的解決方法

插入USB設備，如U盤，讀卡器等時出現：

[root@Nision=W]#usb 1-1: new full speed USB device usings3c2410-ohci and address 2

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 andaddress 3

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 andaddress 4

usb 1-1: device not accepting address 4, error -62

usb 1-1: new full speed USB device using s3c2410-ohci andaddress 5

usb 1-1: device not accepting address 5, error -62

hub 1-0:1.0: unable to enumerate USB device on port 1

無論如何配置內核都無法解決，後發現是UPLLCON的問題，找到的解決辦法：

修改drivers/usb/host/ohci-s3c2410.c

添加頭文件：

#include<mach/regs-clock.h>

在函數s3c2410_start_hc中添加：

unsigned long upllvalue = (0x78<< 12) | (0x02<< 4) | (0x03);

while (upllvalue != __raw_readl(S3C2410_UPLLCON)) {

__raw_writel(upllvalue, S3C2410_UPLLCON);

mdelay(1);

}

在這裏，S3C2410_UPLLCON的值爲0xF4100008。