usb 1-1: device descriptor read64, error -62

不知道动了什么，内核启动的时候忽然打印出下面的错误信息：

usb 1-1: new full speed USB device using s3c2410-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 and address 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 and address 4 usb 1-1: device not accepting address 4, error -62 usb 1-1: new full speed USB device using s3c2410-ohci and address 5 usb 1-1: device not accepting address 5, error -62

 

在网上查了下说是UPLLCON赋值的问题。

 

试了些办法，最终延长了MPLLCON寄存器赋值和UPLLCON寄存器赋值之间延迟后解决了错误。

 

具体修改了以下代码： vi uboot1.1.4/board/fl2440/fl2440.c

修改board_init函数以下语句:         clk_power->MPLLCON = ((M_MDIV << 12) + (M_PDIV << 4) + M_SDIV);

        /* some delay between MPLL and UPLL */         delay (4000);                 /* configure UPLL */        clk_power->UPLLCON = ((U_M_MDIV << 12) + (U_M_PDIV << 4) + U_M_SDIV); 将其改为：         clk_power->MPLLCON = ((M_MDIV << 12) + (M_PDIV << 4) + M_SDIV);

        /* some delay between MPLL and UPLL */         delay (4000);

 

        delay (4000);                 /* configure UPLL */         clk_power->UPLLCON = ((U_M_MDIV << 12) + (U_M_PDIV << 4) + U_M_SDIV);

 

也就是多加一个delay (4000);