Can't run st-example-image-qt QT examples on a custom board based on STM32MP153C with RGB panel

[NBhat.1]

I'm trying to run QT examples on a build created using st-example-image-qt (Ecosystem v2.1) on our custom board. We have a simple RGB display 800x480 resolution, so I modified the cursor.json on the board as follows

{

 "device": "/dev/dri/card0",

 "outputs": [

   { "name": "DPI1", "mode": "800x480", "size": "800x480" }

 ],

 "hwcursor": false

But when I try to run any QT example I get the following error

root@stm32mp1-midmark:/usr/share# psplash-drm-quit

root@stm32mp1-midmark:/usr/share# export QT_QPA_EGLFS_ALWAYS_SET_MODE="1"

root@stm32mp1-midmark:/usr/share# examples/opengl/hellowindow/hellowindow

[   1] Failed to open device: No such file or directory, Try again...

[   2] Failed to open device: No such file or directory, Try again...

[   3] Failed to open device: No such file or directory, Try again...

[   4] Failed to open device: No such file or directory, Try again...

[   5] _OpenDevice(1086): FATAL: Failed to open device, errno=No such file or directory.

[   6] Failed to open device: No such file or directory, Try again...

[   7] Failed to open device: No such file or directory, Try again...

[   8] Failed to open device: No such file or directory, Try again...

[   9] Failed to open device: No such file or directory, Try again...

[  10] _OpenDevice(1086): FATAL: Failed to open device, errno=No such file or directory.

root@stm32mp1-midmark:/usr/share#

What do I need to do to run QT examples on a simple RGB panel?

Thanks.

[Olivier GALLIEN]

Hi @NBhat.1​ ,

Same issue has already been enter by our local FAE.

We will first answer by this thread.

Olivier

[Olivier GALLIEN · Accepted solution]

Hi,

For reference for anyone interested.

Issue was due to dependances of QT with GPU ... not present on MP153.

To make it work, follow the sequence in :

https://wiki.st.com/stm32mpu/wiki/How_to_build_and_use_an_SDK_for_QT#QT_image_and_SDK_with_EGLFS

but DO NOT ACCEPT EULA !!!

Without EULA the vivante driver and the associated libraries are not built.

The "mesa" package is installed in place of vivante's stuff.

Mesa is able to deal with GPU-less devices.

The example

/usr/share/examples/opengl/hellowindow/hellowindow

works fine. Slow because fully SW emulated, but it works!

Olivier

[danfly09]

In my case it seems Qt is trying to run on /dev/fb0 which is not defined, instead of /dev/dri/card0

Any ideas?

[bgate.1]

seems that your default platform is linuxfb

QT_QPA_PLATFORM=eglfs

[joshd]

Would this also be relevant to the stm32mp151 as well?