Hi Jack
in imx6ull.dtsi one can replace compatible = "ti,imx3100q-uart";
with compatible = "fsl,imx6ul-uart"
uart3 example can be found in some third party boards, for example TechNexion imx6ul-pico board
linux/imx6ul-pico.dtsi at tn-imx_4.9.88_2.0.0_ga-test · TechNexion/linux · GitHub
Best regards
igor
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Thanks for your support. I will test the function.