On 16/11/2019 23:36, Computer Nerd Kev wrote:
> Tony van der Hoff  wrote:
>> On 16/11/2019 10:34, Tony van der Hoff wrote:
>>> Hi,
>>> I'm using a headless pi1B to control some relays. One of these is
>>> connected to GPIO14 (Pin 8). I'm finding that it jitterss rapidly on
>>> boot, then settles down. I suspect that this behaviour is caused by its
>>> secondary UART function, which I don't use. Is there any way to suppress
it?
>>>
>>
>> Well, I've figured it out for myself. For anyone finding this from a
>> search engibe, it is due to a serial console coming up on boot. To disable:
>>
>> sudo raspi-config -> Interfacing Options -> Serial -> No login Shell ->
>> No enable serial hardware
>
> Or, for those not using the configuration tool, by editing
> /boot/cmdline.txt as described here:
> https://www.raspberrypi.org/documentation/configuration/uart.md
>
> On a related note, those requiring a non-default GPIO state at
> start-up can configure them in /boot/config.txt as described here:
> https://www.raspberrypi.org/documentation/configuration/config-txt/gpio.md
>

Thank you, Kev; That is very useful, especially the second document, of
which I was unaware. It's all quite self-explanatory, except for the Alt
entries. Can you (or anybody) please explain what these are?

Thanks, Tony

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