[tbot] [PATCH] tbot: Provide login_delay parameter for Linux board

[Stefano Babic]

Hallo Harald,

On 05/03/19 07:29, Harald Seiler wrote:
> Hello Lukasz,
> 
> thank you for your patches!  The first one is perfect, I'll apply it asap.
> With the second one I'm not quite happy:  I tried to keep the use of timeouts
> to an absolute minimum in tbot to A) make it as fast as possible and B) as
> robust as possible.  Timeouts introduce unnecessary delays and can break easily
> if they were not set with enough tolerance (which makes things very sloow).

Well, they should just be configurable and skipped if not required.

> 
> Now I am completely aware of the issue you try to solve here as I have fought
> this exact problem myself in the past.  My current best bet for a solution would
> be calling `sysctl kernel.printk 1 1 1 1` at the start of each board session to
> at least keep the kernel from clobbering the console.


This is not a generic solution - it changes the product and it is a fix
just in case output is coming from kernel. There are a lot of cases
where customer's application is just printing to the console at the
start up. A delay lets us to configure it on project basis, and dropping
kernel output does not help.

> 
> But this is of course not implemented yet (mainly because of portability concerns)
> so I am willing to settle with your patch for now.
> 

Best regards,
Stefano

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