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AM335x平台linux系统启动完毕后,使用串口4登录并在板上运行HelloWorld程序,无任何打印输出



  1、目前在AM335x平台上运行HelloWorld程序时,终端4界面上无任何打印输出,打印使用的函数是printf,如果直接在命令行输入命令echo "hello world"  > /dev/ttyS4 , 终端界面上有hello world输出,请高手指点这是啥原因??我们平台只有串口4作为调试串口