debug版本開機後不出uartlog

kernel/kernel/printk.c

inline void mt_disable_uart()
{   
    if(mt_need_uart_console == 0){                                                      
        printk("<< printk console disable >>\n");                                       
        printk_disable_uart = 0;//1  //modified by sunjinbiao on 20140627 temp
    }else{                                                                              
        printk("<< printk console can't be disabled >>\n");                             
    }   
}