[Buildroot] EGLFS Could Not Find DRM Device!

[Peter Seiderer]

Hello Scott,

On Wed, 18 Aug 2021 20:28:12 +0000, Scott Bartolett <SBartolett at thorlabs.com> wrote:

> Yes I have the BR2_PACKAGE_RPI_FIRMWARE_INSTALL_DTB_OVERLAYS enabled and rpi-firmware/overlays entry in genimage.  If I search the buildroot output folder I find this:
>
> ./output/images/rpi-firmware/overlays/vc4-kms-v3d.dtbo
> ./output/images/rpi-firmware/overlays/vc4-kms-v3d-pi4.dtbo
> ./output/build/rpi-firmware-1a46874494146f470d7a61b0b6f4f15a07dd8b35/boot/overlays/vc4-kms-v3d.dtbo
> ./output/build/rpi-firmware-1a46874494146f470d7a61b0b6f4f15a07dd8b35/boot/overlays/vc4-kms-v3d-pi4.dtbo
>
> But I do not find those files anywhere on the target machine.  I am using a root file system overlay.  Might that be my problem?

The overlays are stored in the first/boot partition (vfat one where the dtb files,
config.txt and cmdline.txt, bootcode.bin and start.elf and fixup.dat and zimage
are found) and not on the second/root (ext4 one with the complte root file system)
partition of the SD card...

Regards,
Peter

>
> I appreciate your help with this.
>
> Scott
>
>
> -----Original Message-----
> From: Peter Seiderer [mailto:ps.report at gmx.net]
> Sent: Wednesday, August 18, 2021 12:11 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 Wed, 18 Aug 2021 13:08:28 +0000, Scott Bartolett <SBartolett at thorlabs.com> wrote:
>
> > 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.
>
> The buildroot config option is name BR2_PACKAGE_RPI_FIRMWARE_INSTALL_DTB_OVERLAYS,
> do not forget to do a full re-build of the rpi-firmware package after enabling...
>
> For inclusion of the overlay files to the target/SD-card boot/first partition check/add the 'rpi-firmware/overlays' entry in the genimage file (see e.g.
> board/raspberrypi3/genimage-raspberrypi3.cfg for an example)...
>
> Regards,
> Peter
>
> >
> > 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%2Fgith
> > ub.com%2Fraspberrypi%2Ffirmware%2Fblob%2Fmaster%2Fboot%2Foverlays%2FRE
> > ADME&data=04%7C01%7CSBartolett%40thorlabs.com%7C2be70acef94f4fd7a6
> > 6e08d96262d8bf%7C411510044224448aa787d4279c1f087d%7C0%7C0%7C6376489989
> > 66807962%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiL
> > CJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=TRayRYYU6JoOopJfA9zspOI
> > n%2FGObRgfP2zYF2bS%2BCEA%3D&reserved=0
> >
> > >
> > > Thanks,
> > > Scott
> > >
> >
>