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Re: No /dev/video0 on Pi 4 with CSI camera


oregano@disroot.org dijo [Wed, Jan 06, 2021 at 09:09:09AM +0000]:
> > I'm experimenting with a Raspberry Pi 4 Model B and can't seem to get
> > V4L to expose a /dev/video0 device when using the standard CSI camera
> > module. Raspbian on the same device seems to expose one correctly. I'm
> > using the 20200707_raspi_4 image.
> I was having similar problems with an early Pi 1, Model B+. The following exposed a /dev/video0 device for me. Maybe it works for a Pi4 too.

I was very happy to see this message! Still...

> Installed raspi_0w image.
> Added start_x=1 in /boot/firmware/config.txt
> Installed v4l-utils, v4l2ucp, v4l-conf.
> Installed a bunch of python stuff...
> No joy.
> Upgraded system to debian testing (to get the bcm2835_v4l2 module, from the staging directory).
> Reboot.
> Changed /boot/firmware/config.txt again, because it was overwritten during upgrade to testing: start_x=1 ; Also added gpu_mem=128 but not sure if this is needed.
> Reboot
> Magic! /dev/video0 now exists.
> Haven't captured a picture yet, but this looks promising:
> # v4l2-ctl --info

No luck yet :-( I tried this on a RPi4, and while /dev/vide0 exists,
any attempts to use it ends up with a dead camera grabbing program :-(

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