Yocto Qt5 GUI App not running on RPi3

[aashishqt]

Hi All,

I have build a "rpi-test-image" using Yocto dunfell with the meta-openembedded, meta-raspberrypi, meta-qt5 layers and following settings in my local.conf file

MACHINE ?= "raspberrypi3"

IMAGE_INSTALL_append = " qt3d qt5-plugin-generic-vboxtouch qtbase qtcharts qtconnectivity qtdatavis3d qtdeclarative qtgraphicaleffects qtimageformats qtlocation qtmultimedia qtquickcontrols2 qtquickcontrols qtscript qtsensors qtserialport qtsvg qtsystems qttools qttranslations qtvirtualkeyboard qtwebchannel qtwebkit qtwebsockets qtxmlpatterns openssh-sftp-server gdb gdbserver"

Now I setup meta-toolchain-qt5 and using Qt creator I created a very basic Qt Quick Application (compat) with the following settings,

in .pro file;

Default rules for deployment.

target.path=/home/root
INSTALLS += target

QMAKE_LFLAGS=--sysroot=/opt/poky/sdk_rpi/sysroots/cortexa7t2hf-neon-vfpv4-poky-linux-gnueabi

Now when I run this app in my RPi3 the GUI does not pop-up, I am getting the following error,


then I exported the following environment variables,
export QT_QPA_PLATFORMTHEME=qt5ct
export DISPLAY=:0.0
export XDG_SESSION_TYPE=x11
export QT_QPA_PLATFORM=offscreen
export XDG_RUNTIME_DIR=/var/volatile/tmp/runtime-root

then I got the following error,

I think it is OpenGL error, please tell me how to solve this problem, I am in a great need of it.
Thanks

[Ronel_qtmaster]

@aashishqt i think your image does not have the window manager of xcb, that is probably why you don't see the gui.Try to build a core-image-sato and test again with -platform xcb

Moreover Try to add eglfs plugin and linuxfb in your build to test.Forget about offscreen only try with eglfs, xcb, linuxfb or vnc

[aashishqt]

@Ronel_qtmaster Great thanks I built core-image-sato and used QT_QPA_PLATFORM=xcb and I got the GUI. Thanks

Now I want to know that how to add eglfs plugin and linuxfb in my build.

[Ronel_qtmaster]

@aashishqt You're welcome
to enable eglfs, in your local.conf add
DISTRO_FEATURES_remove = "X11 wayland"
then in qtbase_%.bbappend add
PACKAGECONFIG_append = " eglfs"

qtbase_%.bbappend is found in meta-qt5 under recipes-qt, qt5 folder.