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

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