Duo256 UART1/2 Input/Output error

After following the document configured GPIO-0 and GPIO-1 as UART1/2 pins, I wrote some string to it to test if it could work, I got this error

I didn’t use the official buildroot image, but the third party debian
5ee9cd70-27bc-41d8-9b0f-06fccd0ec789
But I want to confirm this board allows user communicating throught this UART port.

我用的官方文档里列出的第三方debian镜像。参照官方文档将GP0和GP1配置为UART后通过命令行直接发送字符串以确认该串口可以正确工作,但是遇到了上面截图里显示的错误信息。考虑到官方文档给出的操作示例就是用的这一对GPIO引脚配置UART,按照常理来说硬件和官方镜像应该允许用户通过这个UART任意通信。那么是否是由于第三方镜像禁止了用户通过该UART进行通信。

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