Problem with Pi 3+ compute module

[g40]

Thank you for the work here - extremely useful.

I've got a Pi Foundation branded OV5647 module attached to the CAM1 connector on the Pi3 IO board. GPIO pins and device tree blob set up as per https://www.raspberrypi.org/documentation/hardware/computemodule/cmio-camera.md. There is a /dev/video0 entry.

I can guess at the problem here but am unwilling to risk damage - hence the question. Any thoughts much appreciated.

:~/src/raspiraw$ sudo ./camera_i2c
setting GPIO for board revsion: a02100
Failed: don't know how to set GPIO for this board!

~/src/raspiraw$ uname -a
Linux pi-com 5.4.72-v7+ #1356 SMP Thu Oct 22 13:56:54 BST 2020 armv7l GNU/Linux

:~/src/raspiraw$ lsmod
Module                  Size  Used by
sha256_generic         16384  0
libsha256              20480  1 sha256_generic
cfg80211              692224  0
rfkill                 28672  2 cfg80211
8021q                  32768  0
garp                   16384  1 8021q
stp                    16384  1 garp
llc                    16384  2 garp,stp
asix                   36864  0
raspberrypi_hwmon      16384  0
i2c_bcm2835            16384  0
bcm2835_codec          36864  0
bcm2835_v4l2           49152  0
bcm2835_isp            32768  0
v4l2_mem2mem           32768  1 bcm2835_codec
bcm2835_mmal_vchiq     28672  3 bcm2835_isp,bcm2835_codec,bcm2835_v4l2
snd_bcm2835            28672  1
videobuf2_dma_contig    20480  2 bcm2835_isp,bcm2835_codec
videobuf2_vmalloc      16384  1 bcm2835_v4l2
videobuf2_memops       16384  2 videobuf2_dma_contig,videobuf2_vmalloc
videobuf2_v4l2         28672  4 bcm2835_isp,bcm2835_codec,bcm2835_v4l2,v4l2_mem2mem
videobuf2_common       57344  5 bcm2835_isp,bcm2835_codec,bcm2835_v4l2,v4l2_mem2mem,videobuf2_v4l2
snd_pcm                98304  1 snd_bcm2835
snd_timer              32768  1 snd_pcm
videodev              237568  6 bcm2835_isp,bcm2835_codec,videobuf2_common,bcm2835_v4l2,v4l2_mem2mem,videobuf2_v4l2
snd                    73728  5 snd_timer,snd_bcm2835,snd_pcm
vc_sm_cma              32768  2 bcm2835_isp,bcm2835_mmal_vchiq
mc                     40960  6 bcm2835_isp,bcm2835_codec,videobuf2_common,videodev,v4l2_mem2mem,videobuf2_v4l2
fixed                  16384  0
uio_pdrv_genirq        16384  0
uio                    20480  1 uio_pdrv_genirq
i2c_dev                20480  0
ip_tables              28672  0
x_tables               32768  1 ip_tables
ipv6                  466944  32