How to compile Overlays with Device Tree

I’m trying to add a custom overlay to an existing device tree.

I’ve followed the tutorial to the letter, but now after configuring the kernel up with make nconf, I’d like to compile the device tree using the changes from the overlay. Now there’s one slight problem and that is, that I don’t see an option for adding an overlay, or at least I don’t know how to compile it/use it in a kernel.

Should I append the overlay to the .dts file, that’ll be compiled into the .dtb or should I compile it on it’s own and copy it somewhere the compilation process will take note of it?

This is my current overlay file:


#include <imx6dl-pinfunc.h>

/ {
  compatible = "toradex,colibri_imx6dl", "fsl,imx6dl";
  // EIM_A21
  fragment@0 {
    target = <&pwm2>;
    __overlay__ { status = "disabled"; };

  // SD4_CLK
  // SD4_CMD
  fragment@1 {
     target = <&uart3>;
     __overlay__ { status = "disabled"; };

  // SD1_DAT1
  // SD1_DAT2
  fragment@2 {
     target = <&usdhc1>;
     __overlay__ { status = "disabled"; };

  // Enable backlight pwm
  fragment@3 {
     target = <&pwm1>;
     __overlay__ { status = "enabled"; };

  fragment@4 {
    target = <&iomuxc>;
    __overlay__ {
      pinctrl-names = "default";
       pinctrl-0 = <&pinctrl_test>;

       pinctrl_test: gpiomuxgrp {
         fsl,pins = <
         MX6QDL_PAD_EIM_A21__GPIO2_IO17    0x1b0b0
         MX6QDL_PAD_SD4_CLK__GPIO7_IO10        0x1b0b0
         MX6QDL_PAD_SD4_CMD__GPIO7_IO09        0x1b0b0
         MX6QDL_PAD_SD1_DAT2__GPIO1_IO19    0x1b0b0
         MX6QDL_PAD_EIM_D23__GPIO3_IO23    0x1b0b0
         MX6QDL_PAD_NANDF_D7__GPIO2_IO07    0x1b0b0
         MX6QDL_PAD_SD1_DAT1__GPIO1_IO17    0x1b0b0
         MX6QDL_PAD_SD1_CLK__GPIO1_IO20        0x1b0b0
         MX6QDL_PAD_EIM_D25__GPIO3_IO25    0x1b0b0

So far device tree overlays are only used/supported in Torizon and in the regular Embedded Linux BSP no such integration has been done as of yet, sorry.

Sorry, misread the answer, I read it as “…are only used/supported in Torizon and in the regular Embedded Linux BSP…”.

Thanks for your help!

You are welcome.

Best regards,