Verdin iMX8M-Plus and custom DTB integration into yocto

Technical Support
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1

Hello,

We have a project with Verdin iMX8M-Plus and we use Toradex reference yocto minimal image with BSP5.x. I already customized the image for the desired recipes and works fine for us.

Recently I customized imx8mp-verdin-wifi-dahlia.dts in the linux kernel code and created our own dts by copying it imx8mp-verdin-wifi-custom.dts. It is compiled and I have corresponding dtb file. I can use this new dtb file by doing:

  1. Copy compiled device tree file imx8mp-verdin-wifi-custom.dtb to the boot partition in the SDCard
  2. Delete overlay folder and overlay.txt file
  3. Reboot the device
  4. Enter into U-boot (press any button in 1 sec)
  5. setenv fdt_board custom
  6. saveenv
  7. reset

But I don’t want to follow these steps manually. What I want in Toradex yocto is that:

  1. Disable all overlays
  2. Use directly imx8mp-verdin-wifi-custom.dts that I will put in yocto folders (I prefer not to put this in kernel since kernel codes are in the toradex repository)

Any guidance about how to do that?

Thank you.

2

Hi @Fide ,

in the kernel configuration under the section “Boot options” you can see the following:

Use appended device tree blob to zImage (EXPERIMENTAL)

After this is enabled you can follow these steps from the NXP forum.

Can you give this a try and let us know if it worked as intended?

Best Regards
Kevin