Allow specifying rknn soc in config

[mikenorgate]

Describe what you are trying to accomplish and why in non technical terms
When running in Kubernetes on rockchip hardware there is a requirement to run in privileged mode to allow access to the /proc/device-tree/compatible file. In privileged mode Kubernetes doesn't pass the memory limits through to the container meaning /sys/fs/cgroup/memory.max isn't available, this makes the memory usage statistics wrong but also impacts other processes that use this data to track available system memory

Describe the solution you'd like
Ability to pass the value of /proc/device-tree/compatible via some other means, maybe in config or an env varialbe

Describe alternatives you've considered
Looked at using

securityContext:
          procMount: Unmasked

but that requires hostUsers: false which requires enabling a feature gate and configuring support in containerd

[NickM-27]

can you not just copy the value of that file somewhere else, and map it from that file to /proc/device-tree/complatible in the container?

[mikenorgate]

Unfortunately not, Kubernetes takes full control of /proc and can't map anything there

[NickM-27]

@MarcA711 let me know what you think on this

[MarcA711]

AFAIK, this file is required by Rockchip's Toolkit for neural networks. Without this file, the Toolkit will throw an exception.

So even if we remove this line, the code will fail

frigate/frigate/detectors/plugins/rknn.py

Line 78 in 5fc030c

with open("/proc/device-tree/compatible") as file:

I will check if this is still true for the current version of the Toolkit. Maybe this was changed.

Perhaps once we switch to the new open source driver in the mainline kernel this limitation will be gone.