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Android 11, Tinker Board S R2, TTL Uart

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I want to use Uart in GPIO with Tinker Board S R2.

But, below url, there are information aboutTinker Board 2 Series.



In Tinker Board S R2, Where is 'config.txt' ? 

I make it in /dtoverlay/config.txt, but i think it doesn't working.


How to use GPIO port in Tinker Board S R2? 

How can I use 'config.txt' file?



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