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Only ttymxc0 and ttymxc1 are checked in the list, is this normal?

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My tinker edge t board has two UARTs, ttymxc0 and ttymcx1.
If you don't see ttymxc2 in the get start documentation, it says to do sudo apt-get dist-upgrade. However, ttymxc2 is not visible even after rebooting after sudo apt-get dist-upgrade.
When ttymxc0 and ttymxc1 are opened for UART communication, communication is not possible, so I want to know what to do to enable uart communication.


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