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

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Message-ID: <20070308134800.GA30023@flint.arm.linux.org.uk>
Date:	Thu, 8 Mar 2007 13:48:00 +0000
From:	Russell King <rmk+lkml@....linux.org.uk>
To:	Robin Getz <rgetz@...ckfin.uclinux.org>
Cc:	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

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.

-- 
Russell King
 Linux kernel    2.6 ARM Linux   - http://www.arm.linux.org.uk/
 maintainer of:
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