How to ''disabled'' node UART3

[ThinhNguyen_FE]

Dear NXP Team, 

We are developing in iMX8MP Eval Kit. 

and now, if we want to "disabled" node UART3 of iMX8MP. Where will i find to access .dts and modify. 

we are using Yocto to build.

After modifying, how to re- compile and re-build the image ? 

How can I view the u-boot call to which .dtb ? 

Regards, 

Thinh

[ThinhNguyen_FE]

Dear Dhruvit, 

Thank so much. 

Brgs, 

Thinh 

[Dhruvit]

Hi @ThinhNguyen_FE,

I hope you are doing well.

If there are no further issues, can I mark this case as close ?

Thanks & Regards,
Dhruvit Vasavada

[Dhruvit]

Hi @ThinhNguyen_FE,

I hope you are doing well.

One can disable uart3 in the device as below(at /arch/arm64/boot/dts/freescale
/imx8mp-evk.dts in linux-imx).

&uart3 {
        pinctrl-names = "default";
        pinctrl-0 = <&pinctrl_uart3>;
        assigned-clocks = <&clk IMX8MP_CLK_UART3>;
        assigned-clock-parents = <&clk IMX8MP_SYS_PLL1_80M>;
        fsl,uart-has-rtscts;
-       status = "okay";
+      status = "disabled"; 
};

Please create a patch after the above change & move that patch to /sources/meta-imx/meta-bsp/recipes-bsp/u-boot/u-boot-imx folder in yocto source.

and make below change in u-boot-imx_2022.04.bb

FILESEXTRAPATHS:prepend := "${THISDIR}/${PN}:"
SRC_URI += " file://<patch name>.patch "

after that, one can run bitbake command again to build the image.

How can I view the u-boot call to which .dtb? 
[Ans]: one can use the below command.
          => printenv fdtfile

Thanks & Regards,
Dhruvit Vasavada