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@@ -29,3 +29,20 @@ ACTION=="add", SUBSYSTEM=="tty", ATTRS{idVendor}=="10c4", ATTRS{idProduct}=="ea6
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# check permissions of /dev/zwave-dongle
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$ sudo docker run --device /dev/zwave-dongle:/dev/zwave-dongle …
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```
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+
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+## mount `/proc/device-tree`
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+
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+required by `Adafruit-DHT`:
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+https://github.com/adafruit/Adafruit_Python_DHT/blob/a609d7dcfb2b8208b88498c54a5c099e55159636/source/Raspberry_Pi_2/pi_2_mmio.c#L43
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+
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+`/proc/device-tree` is a symlink to `/sys/firmware/devicetree/base`.
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+
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+However, `docker run -v /sys/firmware/devicetree/base:/sys/firmware/devicetree/base:ro …` is ineffective.
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+
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+Evil workaround:
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+```sh
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+# start container without explicitly mounting devicetree
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+$ sudo docker run --name home_assistant …
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+# umount shadowing tmpfs
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+$ sudo nsenter --target $(sudo docker inspect --format={{.State.Pid}} home_assistant) --mount umount /sys/firmware
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+```
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