linux-kernel - Re: should RTS init in serial core be tied to CRTSCTS

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Message-ID: <57354eff0703080623r2f7f88c3r7ddf6381061cbd73@mail.gmail.com>
Date:	Thu, 8 Mar 2007 15:23:49 +0100
From:	"Oleksiy Kebkal" <kebkal@...il.com>
To:	"Robin Getz" <rgetz@...ckfin.uclinux.org>,
	"Oleksiy Kebkal" <kebkal@...il.com>,
	"Krzysztof Halasa" <khc@...waw.pl>,
	"Mike Frysinger" <vapier.adi@...il.com>,
	"Linux Kernel Mailing List" <linux-kernel@...r.kernel.org>,
	linux-serial@...r.kernel.org
Subject: Re: should RTS init in serial core be tied to CRTSCTS

2007/3/8, Russell King <rmk+lkml@....linux.org.uk>:
> On Thu, Mar 08, 2007 at 08:44:31AM -0500, Robin Getz wrote:
> > On Wed 7 Mar 2007 16:30, Oleksiy Kebkal pondered:
> > > 2007/3/7, Robin Getz <rgetz@...ckfin.uclinux.org>:
> > > > Right - so the question is where to manage the default state? I was
> > > > thinking in the resource might be a good idea, but there isn't really a
> > > > good place for it. (You could re-use some bits if flags, but I think that
> > > > would not be a good idea).
> > >
> > > /proc/tty/driver/uartN/settings?
> > >
> >
> > That would let you change things are run time, but the problem is at boot
> > time. A default setting needs to be set, so when things initialize, and proc
> > does not exist yet, it is still set properly...
>
> I disagree.  "proc does not exist yet" - the only time that applies is
> long before userspace as active.
>
> As I've said already, having a console on the same port as your application
> program is just asking for trouble.  All bets are off - the kernel _will_
> corrupt your data stream in random places.
>
> Don't do it - it will _NEVER_ be reliable.
>
> Never, ever, mix kernel consoles with application serial ports.

Ok. I understand now one of the sources of misunderstanding. I don't
want to mix console and application serial port. It was a question,
Myke Frisinger initially asked. I would switch on/off console
depending on some external control action if possible...

The other problem is how to open serial port with correct settings
_after_ booting. In this case /proc could be applicable, isn't it?

-Oleksiy
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