bob prohaska  wrote:
> Computer Nerd Kev  wrote:
>> bob prohaska  wrote:
>>>
>>> It looks as if the logic of the green status LED has been inverted:
>>> On the 3b+ the LED was off when idle, flashing when active. The 4
>>> seems to idle with the green LED on, it blinks off when active.
>>>
>>> Is that the whole story? I poked around a little on the Web and
>>> didn't find any mention, except for flash codes that signal POST
>>> failures.
>>
>> Look in the file /boot/overlays/README. Well I might as well just
>> copy the potentially relevent bits here, but I may have missed some:
>
> Is there a command to read back what's actually in use? I've not
> modified the defaults in any intentional way, but it does seem
> that the behavior I see is inverted compared to other observations.

I don't know of such a command, but I'd be interested to hear if
there is one.

There is a lot of info here, though I don't know whether your answer
is in there or not:
https://www.raspberrypi.org/documentation/configuration/device-tree.md

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