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看到CM5底板的40P只有两个串口，我们需要用到4个串口，需要修改dts文件，板子出厂装的ubuntu20，自己下载的内核源码5.4.0，只看到很多有rk3288的dts文件，找不到rk3588s-cp4.dts文件。咋办？
@qys2022 github下载coolpi的内核源码。
哦，好的好的，多谢多谢