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If all is well you should get a /dev/video0 device, and "v4l2-ctl --list-devices" will tell you that it is provided by Unicam.
After connecting all the cables, power on the Raspberry Pi, the C779/C790 indicator light is normally green, and after opening the Raspberry Pi terminal, enter the following command:
pi@raspberrypi:~ $ ls /dev/video0
/dev/video0
<pre>
pi@raspberrypi:~ $ ls /dev/video0/dev/video0pi@raspberrypigeekworm:~ $ v4l2-ctl --list-devices
bcm2835-codec-decode (platform:bcm2835-codec):
/dev/video10
/dev/video12
/dev/video18
/dev/media1video31
bcm2835-isp (platform:bcm2835-isp):
/dev/video15
/dev/video16
/dev/video20
/dev/video21
/dev/video22
/dev/video23
/dev/media0
/dev/media2
unicam (platform:fe801000.csi):
/dev/video0
/dev/video1media4 rpi-hevc-dec (platform:rpi-hevc-dec): /dev/video19 /dev/media3 bcm2835-codec (vchiq:bcm2835-codec): /dev/media2media1
</pre>