Hi,
RTT is provided by Segger, and there are not additional specific information/guidelines for using it on i.MX RT. So, in this case, you should directly contact Segger for support.
As complementary information, you could take a look at the following link:
https://mcuoneclipse.com/2015/07/07/using-segger-real-time-terminal-rtt-with-eclipse/
Hope this will be useful for you.
Best regards!
/Carlos
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