Cannot compile Device Tree Overlays from Source Code

Technical Support
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21

Hello @rudhi.tx ,

when I execute the make command from ImageDev/DeviceTree/device-tree-overlays/overlays/ directory, many .dtbo file are created in the same directory.
No dtb file are created in ImageDev/linux/arch/arm/boot/dts/ directory.

The last messages from make command are:
DTC /home/showroom/Dev/Toradex/ImageDev/DeviceTree/device-tree-overlays/overlays/verdin-imx8mm_spidev_overlay.dtbo
DTC /home/showroom/Dev/Toradex/ImageDev/DeviceTree/device-tree-overlays/overlays/verdin-imx8mp_spidev_overlay.dtbo
MODPOST /home/showroom/Dev/Toradex/ImageDev/DeviceTree/device-tree-overlays/overlays/Module.symvers
make[1]: uscita dalla directory «/home/showroom/Dev/Toradex/ImageDev/linux»

The file to use to flash the device tree on Colibri, is a .dtb or a .dtbo ?

22

HI @Massimo,

when I execute the make command from ImageDev/DeviceTree/device-tree-overlays/overlays/ directory, many .dtbo file are created in the same directory.
No dtb file are created in ImageDev/linux/arch/arm/boot/dts/ directory.

You are mixing up device tree overlays with device trees here. As I already told you before, your module (Colibri iMX6ULL 256/512MB) does NOT support overlays. You should be working in the linux/arch/arm/boot/dts directory, and not in the device-tree-overlays/overlays/ directory. You should modify the necessary dts file in linux/arch/arm/boot/dts directory, execute the make command in the linux directory and this should generate the dtb files as I explained earlier.

The file to use to flash the device tree on Colibri, is a .dtb or a .dtbo ?

Since this module does not support overlays, you should be updating the ubi partition with the dtb files.

23

Hi @rudhi.tx ,

now I understood.
But please tell me which are the right dts and dtsi files to use to have display working.

Thanks

24

Hello @Massimo,

What type of display are you using? Also which carrier board do you have?

25

Hello @rudhi.tx
I have an Aster board and a VGA display.

26

Hi @Massimo,

From your other post, I understand that the display stopped working after you added the customizations to change the I2C speed. Is that correct?

27

Hi @rudhi.tx ,

yes it is correct.

28

Hello @Massimo

Could you please send me the dmesg logs from the console with the VGA display connected to the module?

29

Hello @rudhi.tx ,

this is the log.
dmesg.txt (21.5 KB)

30

Hi @Massimo !

Please share your device tree source (the .dts / .dtsi) files you customized.

Best regards,

31

Hi @henrique.tx
here the dts files.

Best regards
dts.zip (35.2 KB)

32

Hi @Massimo !

Thanks for the files.

Could you please explain what are each of the files you shared?

Also, what should I test?

Best regards,

33

Hi @henrique.tx,

  • imx6ull-colibri-elsist-slimline.dts is to change I2c speed
  • the others you can compare with the originals you distrubute to see the differences but are for using CAN bus

Thanks