could not find qtplatfom plugin eglfs

[jsulm]

@Asha said in could not find qtplatfom plugin eglfs:

linuxfb, minimal, offscreen, vnc

Looks like you did not build eglfs support when building Qt

[Asha]

@jsulm
but other platforms like linuxfb and vnc both are enabled while building qt,

And I exported linuxfb in my device...

one more ,while building I tried with -eglfs option also but got the error like

ERROR: 'eglfs' already enabled...

[jsulm]

@Asha What do you actually want to use? eglfs? linuxfb? ...?
Adding -eglfs is not going to help as it is already activated, but your Qt build does not support it.

[Asha]

@jsulm I just want to run one simple application in my device, by using anyone..

[jsulm]

@Asha Well, I think I already mentioned this once: you have to know what your device actually uses. Is it X11, eglfs, linuxfb, ...?

[Asha]

@jsulm

can you please tell me more about X11,or any link..what exactly it will do?

[jsulm]

@Asha Google knows https://en.wikipedia.org/wiki/X_Window_System

[Asha]

@jsulm It means first i need to find which backend is running on my device ,based on that I need to cross compile the qt?

[jsulm]

@Asha said in could not find qtplatfom plugin eglfs:

i need to find which backend is running on my device

yes

[Asha]

@jsulm after finding ,again i need to build ,cross compiled qt?

[jsulm]

@Asha If you did not cross compile needed platform plug-in then yes

[Asha]

@jsulm Hi,

I flashed my board with debian image...any idea which plugin is running on that image...

I got the answer ,we are using linux backend...

[Asha]

for eglfs plugin ,which packages are required and how to install those?

[jsulm]

@Asha Please take a look at https://doc.qt.io/qt-5/embedded-linux.html
"we are using linux backend" - which one?

[Asha]

@jsulm I asked,which backend is running on board?

got the ans:linux

shall I ask more about backend or any link?

[jsulm]

@Asha We know from the beginning that the OS is Linux. Linux is an operating system supporting different technologies for graphics, like: X11, directfb, eglfs, ...
These technologies is what is called "backends" in Qt.

[Asha]

@jsulm Hi ,Thank you for you guide...

I found which plugin is running on my board,
That is eglfs only,

with this link https://doc.qt.io/qt-5/embedded-linux.html

for beagleboneboard my build directory is Qt5,

I got the information in the folder below

cd /home/beagle/Qt5/mkspecs/devices/linux-beagleboard-g++/qmake.conf

in qmake.conf file

QT_QPA_DEFAULT_PLATFORM = eglfs

so now,how to proceed next?

can i change the QT_QPA_DEFAULT_PLATFORM in that file ?

or need to configure with eglfs only?

[jsulm]

@Asha What did configure say about eglfs? Was it activated?

[Asha]

@jsulm I gone through this link,https://doc.qt.io/qt-5.12/embedded-linux.html

please go through the selected paragraph in the below screenshot,
in the mentioned the path i got it(dont no its currect or not just guessed)

[Asha]

how to proceed next?