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Enabling UART3 for serial communication on i.MX8M Mini Evk

Question asked by Abhijit Thorat on Jun 14, 2019
Latest reply on Jun 25, 2019 by Abhijit Thorat

I am using Android pie (android_p9.0.0_1.0.0-ga_image_8mmevk) on i.MX8M Mini EVK

I want use UART for my Application development.

As per document IMX8MMEVKHUG.pdf UART3 can be accessible from Expansion header(J1103) (Pin No.7, 8, 9, 10, 11)

Can you please guide me how to enable UART3 on i.MX8M Mini EVK and how to use it to send and receive data?


I think /dev/ttymxc2 is for UART3

But when I try to configure it I get following error:

stty -F /dev/ttymxc2 115200 raw -echo

stty: /dev/ttymxc2: Permission denied


Why I am getting such kind of error?

Is there any way to enable UART without compiling any other source code or kernel code. Please help me to solve this issue.


Attached IMX8MMEVKHUG.pdf and boot logs for reference.