[Buildroot] EGLFS Could Not Find DRM Device!

Scott Bartolett SBartolett at thorlabs.com
Wed Aug 18 13:08:28 UTC 2021


Hi Peter,

On a raspbian install I find the file vc4-kms-v3d.dtbo.  However on the buildroot install, I do not find any files that match vc4-kms-v3d*.   I've searched for and enabled additional items in the buildroot config that might be related, but nothing has helped yet.

Thanks,
Scott


-----Original Message-----
From: Peter Seiderer [mailto:ps.report at gmx.net] 
Sent: Tuesday, August 17, 2021 2:10 PM
To: Scott Bartolett <SBartolett at thorlabs.com>
Cc: buildroot at busybox.net
Subject: Re: [Buildroot] EGLFS Could Not Find DRM Device!

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://nam02.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2Fraspberrypi%2Ffirmware%2Fblob%2Fmaster%2Fboot%2Foverlays%2FREADME&data=04%7C01%7CSBartolett%40thorlabs.com%7C919da371d81c4cb2c6b308d961aa4771%7C411510044224448aa787d4279c1f087d%7C0%7C0%7C637648206254285944%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=QZiffVLIgJEx40pM6%2BtT7y9teGDYDYaqrl8T%2Fz861rM%3D&reserved=0

>
> Thanks,
> Scott
>



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