[Buildroot] EGLFS Could Not Find DRM Device!

Peter Seiderer ps.report at gmx.net
Tue Aug 17 18:10:14 UTC 2021


Hello Scott,

On Tue, 17 Aug 2021 17:47:49 +0000, Scott Bartolett <SBartolett at thorlabs.com> wrote:

> Hi all,
>
> I'm trying to run a Qt5 application on a Raspberry Pi running buildroot.  The application runs fine when I use the platform plugin linuxfb.  But when I try to use eglfs I'm getting the error that the DRM Device is not found.  I see this error message mentioned often when doing a search, but so far have not found any solution that works for me.  I've selected:
> BR2_PACKAGE_MESA3D_GALLIUM_DRIVER_V3D
> BR2_PACKAGE_MESA3D_GALLIUM_DRIVER_VC4
> BR2_PACKAGE_MESA3D_GALLIUM_DRIVER_KMSRO
> BR2_PACKAGE_MESA3D_OPENGL_ES
> BR2_PACKAGE_QT5BASE_OPENGL_ES2
> BR2_PACKAGE_QT5BASE_EGLFS
>
> Does anyone have any suggestions?

Edit the config.txt file on the first/boot partition on the SD card and
add (for RPi4):

	dtoverlay=vc4-kms-v3d-pi4

or (for Rpi3,...):

	dtoverlay=vc4-kms-v3d

See [1] for details...

Regards,
Peter

[1] https://github.com/raspberrypi/firmware/blob/master/boot/overlays/README

>
> Thanks,
> Scott
>



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