Hi Chiranjeevi,
You could refer to Chapter 46 “Universal Asynchronous Receiver/Transmitter (UART) Driver” of the “i.MX 6 Linux Reference Manual” document (IMX6LXRM).
Additionally, you could take a look at the following Community document:
How-To use UART7/8 on i.MX6UL
Hope this will be useful for you.
Best regards!
/Carlos
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