Heartbeat LED during init script

[Sascha Hauer]

On Thu, Feb 18, 2021 at 09:00:42AM +0100, Marcel Hellwig wrote:
> Hey Sasha,
> 
> I have a slight problem here:
> This is what I think:
> 
> Because the memtest gets called in the init routine, the `ctrl` is
> completly ignored, at least I can't interrupt it nor the LED blinks.

Yes, ctrlc() is allowed only after startup. We could move calling
poller_call() up, before we test if ctrlc is allowed.

> But if I insert `poller_call`, the led blinks, but the memtest is
> painfully slow (like 10x slower at least).

poller_call() takes some time. A solution might be to call poller_call()
just every thousand times or so in memtest loop.

Sascha

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