Boot2Qt 6.4 Deployment Error: drmModeGetResources failed & QML "Constants" issues

Weber01

Hello everyone,
I am working with a Variscite DART-MX8M-PLUS SoM on its custom carrier board. I have installed the Boot2Qt image provided by Variscite (based on Yocto Kirkstone), which provides Qt 6.4.
I successfully built the SDK/Toolchain and configured Qt Creator for remote deployment. I created a default project using Qt Design Studio, opened it in Qt Creator, and tried to deploy it to the target.

The Problem:

When deploying from Qt Creator, the application fails to start with the following EGLFS/DRM error:

QML debugging is enabled. Only use this in a safe environment.
drmModeGetResources failed (Operation not supported)
no screens available, assuming 24-bit color
Cannot create window: no screens available

headingHardware Setup:

Display connected via HDMI.
Expected DRM device: /dev/dri/card0 (checked via ls /dev/dri/).

Troubleshooting attempts:

Checked for conflicting display servers (Weston/Wayland). systemctl and ps show no display managers running (only standard services like dbus, connman, bluetooth, etc.).
I tried enforcing the KMS configuration by exporting
QT_QPA_EGLFS_KMS_CONFIG.
Created file /tmp/config.json:

{ "device": "/dev/dri/card0", "outputs": [ { "name": "HDMI-A-1", "mode": "1920x1080" } ] }

Current Status:

Via Qt Creator: The error persists (drmModeGetResources failed).
Via Serial Terminal (Manual run): If I run the executable manually from the terminal (SSH/Serial), EGLFS seems to initialize (no DRM error), but the screen remains black and the app crashes with QML errors regarding the Qt Design Studio generated code:

qrc:/qt/qml/TestContent/Screen01.ui.qml:48: ReferenceError: Constants is not defined 
qrc:/qt/qml/TestContent/Screen01.ui.qml:55: ReferenceError: Constants is not defined

It seems like the "Constants" singleton file generated by Design Studio is not being linked or loaded correctly in this Boot2Qt environment.

My Questions:

Why does drmModeGetResources fail when deployed via Qt Creator but seemingly passes when run manually?
Does the Qt Creator runner environment lack specific environment variables?
How can I properly fix the ReferenceError: Constants is not defined in a CMake-based Boot2Qt deployment without manually hardcoding values in the QML files?

Any help is appreciated!

LawrenceLee

Imports in QML match the module URI exactly. Once the module is properly deployed, the error disappears.
https://forum.qt.io/topic/162691/mediaplayer-videooutput-sigsegv-gst_v4l2_object_fill_format_list msn games