Gah, I've found the issue.
Based on the investigation in this thread
https://www.raspberrypi.org/forums/viewtopic.php?f=98=174347=25#p1120478
I narrowed it down to dtparam=i2c_arm=on preventing the secondary camera
from being detected.
After commenting out dtparam=i2c_arm=on from
On the Raspberry Pi OS side:
$ vcgencmd version
Aug 19 2020 17:41:31
Copyright (c) 2012 Broadcom
version e90cba19a98a0d1f2ef086b9cafcbca00778f094 (clean) (release) (start_x)
$ uname -a
Linux raspberrypi 5.4.51-v7+ #1333 SMP Mon Aug 10 16:45:19 BST 2020 armv7l
GNU/Linux
$ vcgencmd get_camera
Vincent, could you pls help triage and remedy this?
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https://bugs.launchpad.net/bugs/1904306
Title:
bcm2835-v4l2 does not detect/expose the second camera on RPi Compute
Module 3+ in
