Verdin iMX8MP: not HDMI on custom image

ToradexAI · September 23, 2024, 8:34pm

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It looks like you’re encountering an issue with Weston failing to start on your custom image for the Verdin iMX8M Plus module. The error message indicates that the wayland-backend.so module cannot be found, which is likely causing the compositor backend to fail.

Here are a few steps to troubleshoot and resolve the issue:

Check Weston Configuration:
Ensure that your weston.ini configuration file is correctly set up. The file should be located at /etc/xdg/weston/weston.ini. Verify that the [core] section is properly configured to use the correct backend.
Verify Weston Installation:
Make sure that all necessary Weston packages are installed. Specifically, check if the libweston-10 package is installed, as it contains the wayland-backend.so module.
```
opkg list-installed | grep weston
```
If the package is missing, you can add it to your image by modifying your Yocto recipe:
```
CORE_IMAGE_EXTRA_INSTALL += "weston libweston-10"
```
Device Tree Overlays:
You mentioned that the overlays are being applied correctly. Double-check that the HDMI-related overlays are correctly specified and applied. The relevant overlays for HDMI on the Verdin iMX8M Plus should include verdin-imx8mp_hdmi_overlay.dtbo and verdin-imx8mp_dsi-to-hdmi_overlay.dtbo.
Kernel Modules:
Ensure that the necessary kernel modules for HDMI are loaded. You can check the loaded modules using:
```
lsmod
```
If any required modules are missing, you may need to include them in your kernel configuration.
Logs and Debugging:
Check the system logs for more detailed error messages that might provide additional clues. You can use dmesg and journalctl to inspect the logs:
```
dmesg | grep drm
journalctl -xe
```
Weston Command Line:
When running Weston from the console, try specifying the backend explicitly:
```
/usr/bin/weston --backend=drm-backend.so --modules=systemd-notify.so
```
This can help ensure that Weston is using the correct backend.

Yocto Recipe:
Review your Yocto recipe to ensure that all necessary dependencies and configurations are included. Here is a simplified example of what your recipe might look like:

DESCRIPTION = "My image"
LICENSE = "MIT"

inherit core-image features_check populate_sdk_qt6

CONFLICT_DISTRO_FEATURES = "directfb"

IMAGE_FEATURES += " \
    splash \
    package-management \
    ssh-server-openssh \
    hwcodecs \
    ${@bb.utils.contains('DISTRO_FEATURES', 'wayland', 'weston', \
       bb.utils.contains('DISTRO_FEATURES', 'x11', 'x11-base x11-sato', '', d), d)} \
"

CORE_IMAGE_EXTRA_INSTALL += " \
        packagegroup-core-full-cmdline \
        ${@bb.utils.contains('DISTRO_FEATURES', 'x11 wayland', 'weston-xwayland', '', d)} \
        fbgrab \
        libgpiod \
        libgpiod-tools \
        rsync \
        weston \
        libweston-10 \
"

CORE_IMAGE_EXTRA_INSTALL:mx8-generic-bsp += " \
        packagegroup-fsl-gstreamer1.0 \
        packagegroup-fsl-gstreamer1.0-full \
"

systemd_disable_vt () {
    rm ${IMAGE_ROOTFS}${sysconfdir}/systemd/system/getty.target.wants/getty@tty*.service
}

# Install fonts
QT6_FONTS = " \
    ttf-dejavu-mathtexgyre \
    ttf-dejavu-sans \
    ttf-dejavu-sans-condensed \
    ttf-dejavu-sans-mono \
    ttf-dejavu-serif \
    ttf-dejavu-serif-condensed \
"

QT6_IMAGE_INSTALL = " \
    ${QT6_FONTS} \
    ${@bb.utils.contains('DISTRO_FEATURES', 'wayland', 'qtwayland qtwayland-plugins', '', d)} \
"

IMAGE_INSTALL += " \
    ${QT6_IMAGE_INSTALL} \
    packagegroup-tdx-cli \
    packagegroup-tdx-graphical \
    chrony \
    aqt6app \
"

IMAGE_PREPROCESS_COMMAND:append = " ${@ 'systemd_disable_vt;' if bb.utils.contains('DISTRO_FEATURES', 'systemd', True, False, d) and

Please, also check if these links can help you solve your problem:

HDMI Display in clone mode not working on imx8m plus.