本文主要探讨AXI Uartlite作为console的可行性，目前的结果是不行。
参考的一些链接：
【1】https://support.xilinx.com/s/question/0D52E00006hpYFySAM/petalinux-issues-using-uartlite-serial-port-as-primary-stdinstdout?language=en_US
【2】
https://support.xilinx.com/s/question/0D52E00006hpmEhSAI/petalinux-20182-error-with-uart-lite-device-as-primary-stdinstdout-console?language=en_US
【3】
https://support.xilinx.com/s/question/0D52E00006ihQneSAE/zynq-ultrascale-mpsoc-using-a-axi-uartlite-as-the-linux-console-psuart-are-disabled?language=en_US
By default PS_UART is needed to get the prints from FSBL so disabling PS_UART may not be a good idea and if it is necessary to use AXI UART as a console after booting bitstream will gets programmed then AXI UART will comes into live which can be used as a boot console there onwards so at least one PS USRT is necessary for the initial stage.
这段话的意思简单来说是 系统启动后，bitstream才会被programmed，AXI UART才能被用，所以可以在启动后，通过stty命令设置ttyUL1的属性，使之成为一个console。
但是本文在系统启动后，将AXI UART的属性修改为与PS UART相同，依然不能作为console...于是尝试就到此为止了。最后是为了能与原理图中UART实物电路匹配，PS端UART通过EMIO的方式分配到原理图上标注的引脚，实现了串口功能。
【4】stty的参数
https://blog.csdn.net/qq_34796705/article/details/116013286