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AM335X GPIO 时钟配置问题



我在UBOOT中,   

    gpio_request(31, "gpmc_wpn");
    gpio_direction_output(31, 1);

    for(i=0;i<10000;i++)
    {
        gpio_set_value(31,0);
        gpio_set_value(31,1);
    }

测试出: gpio_set_value这条命令执行时间为2.5us左右,请问一下怎么速度这么慢!

我在内核驱动中测试,也是一样速度?

请问如何配置能够,让时钟跑到数据手册上提到的100M,谢谢!