no DRI card's dev file in rpi-5.4.y

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Assessment

Difficulty
4/5
Estimated time
3-5 days
Newbie friendliness
25/100
Issue type
Bug
Clarity
Needs clarification
Activity status
Stale
Tech stack
c, linux
Domain
computer-graphics, embedded-iot, operating-systems

Research direction

Start with conf/machine/raspberrypi3.conf and the reported VC4DTBO setting, then reproduce the Linux 5.4.29-v7 behavior using kmscube. Compare the image with and without vc4-fkms-v3d; done means /dev/dri/card0 is present and kmscube initializes its EGL surface successfully.

Written by the indexing model from the issue text.

Description

Hi,
In meta-raspberrypi we forcely switched linux-raspberrypi version to 5.4 from 4.19.

In generated image, under /dev directory there is no /dri/card0 device file. Also while try to launch "kmscube" we got below error,

Error:
drmGetDevice2 failed: No such file or directory
could not open drm device
failed to initialize legacy DRM

Later we added VC4DTBO ?= "vc4-fkms-v3d" in conf/machine/raspberrypi3.conf file.

Now /dri/card0 is created in our image. But while try to launch "kmscube" we got,

Error:
Using display 0xbf81f8 with EGL version 1.4
failed to create egl surface
failed to initialize EGL

Note:
Platform : Raspberrypi3
Kernel version : Linux raspberrypi3 5.4.29-v7

Dominant language
C
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