m.2 coral support

Describe the bug When running in a docker container on a host where the coral is installed as a m.2 device Frigate fails to load. The install instructions appear to have a few extra drivers needed.

I think the differences are gasket-dkms and section 3.

If the user account you’ll be using does not have root permissions, you might need to also add the following udev rule, and then verify that the “apex” group exists and that your user is added to it:

sudo sh -c "echo 'SUBSYSTEM==\"apex\", MODE=\"0660\", GROUP=\"apex\"' >> /etc/udev/rules.d/65-apex.rules"
sudo groupadd apex
sudo adduser $USER apex

Version of frigate 0.8.4

Frigate container logs

frigate    | frigate.edgetpu                INFO    : Attempting to load TPU as usb
frigate    | frigate.edgetpu                INFO    : No EdgeTPU detected.
frigate    | Traceback (most recent call last):
frigate    |   File "/usr/local/lib/python3.8/dist-packages/tflite_runtime/interpreter.py", line 152, in load_delegate
frigate    |     delegate = Delegate(library, options)
frigate    |   File "/usr/local/lib/python3.8/dist-packages/tflite_runtime/interpreter.py", line 111, in __init__
frigate    |     raise ValueError(capture.message)
frigate    | ValueError
frigate    | 
frigate    | During handling of the above exception, another exception occurred:
frigate    | 
frigate    | Traceback (most recent call last):
frigate    |   File "/usr/lib/python3.8/multiprocessing/process.py", line 315, in _bootstrap
frigate    |     self.run()
frigate    |   File "/usr/lib/python3.8/multiprocessing/process.py", line 108, in run
frigate    |     self._target(*self._args, **self._kwargs)
frigate    |   File "/opt/frigate/frigate/edgetpu.py", line 124, in run_detector
frigate    |     object_detector = LocalObjectDetector(tf_device=tf_device, num_threads=num_threads)
frigate    |   File "/opt/frigate/frigate/edgetpu.py", line 63, in __init__
frigate    |     edge_tpu_delegate = load_delegate('libedgetpu.so.1.0', device_config)
frigate    |   File "/usr/local/lib/python3.8/dist-packages/tflite_runtime/interpreter.py", line 154, in load_delegate
frigate    |     raise ValueError('Failed to load delegate from {}\n{}'.format(
frigate    | ValueError: Failed to load delegate from libedgetpu.so.1.0
frigate    | 
frigate    | frigate.watchdog               INFO    : Detection appears to have stopped. Exiting frigate...

[jasonmhite]

@mcristina422 Which version of the Coral m.2 board were you using? The one with a single Coral or the one with two?

I have the dual version and I’m trying to get it working with the Jetson Nano 4Gb as well but I’m not having any luck. I know I can’t use both with the Jetson’s m.2 slot, but I thought it was supposed to still work as a single. I get the dreaded “failed to initialize”… I can’t even get it to work with the SDK example on the host much less Frigate in docker.

[mcristina422]

Ah, oops, you need to define which detector to use. After adding this to my frigate config it works!

detectors:
  coral:
    type: edgetpu
    device: pci