lkml.org 
[lkml]   [2007]   [Mar]   [8]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: should RTS init in serial core be tied to CRTSCTS
On Thu, Mar 08, 2007 at 03:23:49PM +0100, Oleksiy Kebkal wrote:
> 2007/3/8, Russell King <rmk+lkml@arm.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@blackfin.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's not a misunderstanding if you realise that email is threaded and
you _follow_ the individual threads. Robin has a similar concern to
you but _additionally_ wants something that you don't.

So really to remove the "confusion" from this discussion you should
avoid trying to correct replies to Robin's emails.

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

Doubt it with todays opinions about /proc contents. Probably more
appropriate in sysfs, if someone can be bothered to do the work
required to properly integrate tty and sysfs.

Don't look at me; I'm not doing very much with serial anymore.

--
Russell King
Linux kernel 2.6 ARM Linux - http://www.arm.linux.org.uk/
maintainer of:
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2007-03-08 15:31    [from the cache]
©2003-2011 Jasper Spaans