Re: [Buildroot] EGLFS Could Not Find DRM Device!

Hello Scott,

On Wed, 18 Aug 2021 20:28:12 +0000, Scott Bartolett [off-list ref] 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@gmx.net]
Sent: Wednesday, August 18, 2021 12:11 PM
To: Scott Bartolett <redacted>
Cc: buildroot@busybox.net
Subject: Re: [Buildroot] EGLFS Could Not Find DRM Device!

Hello Scott,

On Wed, 18 Aug 2021 13:08:28 +0000, Scott Bartolett [off-list ref] wrote:

quoted

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

quoted

Thanks,
Scott


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

Hello Scott,

On Tue, 17 Aug 2021 17:47:49 +0000, Scott Bartolett [off-list ref] wrote:

quoted

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

quoted

Thanks,
Scott

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