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我在芯片介绍上看到哪吒板有6个UART串口，我现在想开启其他几个口，但我在哪吒板自带的tina系统的/dev目录下只找到了两个串口设备。我该如何添加其他几个串口设备。
board.dts里面把对应的uart status设置为okay，注意引脚复用。
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