No eglfs or linuxfb on Beaglebone Black

Ketank16

So, I successfully compiled Qt for Beaglebone Black and I specified no eglfs in the configure options as per many guides here on Qt forum.

So, when I run my project over SSH, I get following error.

qt.qpa.plugin: Could not find the Qt platform plugin "eglfs" in "/home/debian/Qt5ForBBB/plugins/platforms"
This application failed to start because no Qt platform plugin could be initialized. Reinstalling the application may fix this problem.

Available platform plugins are: linuxfb (from /home/debian/Qt5ForBBB/plugins/platforms), minimal (from /home/debian/Qt5ForBBB/plugins/platforms), offscreen (from /home/debian/Qt5ForBBB/plugins/platforms), vnc (from /home/debian/Qt5ForBBB/plugins/platforms).

Aborted

If I specify -platform linuxfb while running, I get another big error.

Unable to figure out framebuffer device. Specify it manually.
linuxfb: Failed to initialize screen
Device discovery cannot open device "/dev/input/event0"
Device discovery cannot open device "/dev/input/event0"
Device discovery cannot open device "/dev/input/event0"
no screens available, assuming 24-bit color
QFontDatabase: Cannot find font directory /home/ketan/Qt5ForBBB/lib/fonts.
Note that Qt no longer ships fonts. Deploy some (from https://dejavu-fonts.github.io/ for example) or switch to fontconfig.
QFontDatabase: Cannot find font directory /home/ketan/Qt5ForBBB/lib/fonts.
Note that Qt no longer ships fonts. Deploy some (from https://dejavu-fonts.github.io/ for example) or switch to fontconfig.
QFontDatabase: Cannot find font directory /home/ketan/Qt5ForBBB/lib/fonts.
Note that Qt no longer ships fonts. Deploy some (from https://dejavu-fonts.github.io/ for example) or switch to fontconfig.
QFontDatabase: Cannot find font directory /home/ketan/Qt5ForBBB/lib/fonts.
Note that Qt no longer ships fonts. Deploy some (from https://dejavu-fonts.github.io/ for example) or switch to fontconfig.
QFontDatabase: Cannot find font directory /home/ketan/Qt5ForBBB/lib/fonts.
Note that Qt no longer ships fonts. Deploy some (from https://dejavu-fonts.github.io/ for example) or switch to fontconfig.
Cannot create window: no screens available
Aborted

There is no fb device in /dev directory of beaglebone, so I cannot specify it in the command itself.
Any leads in this topic would be greatly appreciated as I haven't ever worked on Qt before.

Ketank16

Thanks, I solved it by exporting QPA_PLATFORM_PATH.

Pablo J. Rogina

@ketank16 said in No eglfs or linuxfb on Beaglebone Black:

There is no fb device in /dev directory of beaglebone, so I cannot specify it in the command itself.

It looks like you need to be able to provide a fb device in your board before willing Qt to use it.
Have you already asked in Beaglebone forum(s) about having fb device(s) in the board?

Ketank16

Thanks, I solved it by exporting QPA_PLATFORM_PATH.