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

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Message-ID: <57354eff0703070538l1a4ed170q6eb8dd8bbf7aadf0@mail.gmail.com>
Date:	Wed, 7 Mar 2007 14:38:25 +0100
From:	"Oleksiy Kebkal" <kebkal@...il.com>
To:	"Krzysztof Halasa" <khc@...waw.pl>
Cc:	"Robin Getz" <rgetz@...ckfin.uclinux.org>,
	"Mike Frysinger" <vapier.adi@...il.com>, rmk@....linux.org.uk,
	"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

2007/3/7, Krzysztof Halasa <khc@...waw.pl>:
> Robin Getz <rgetz@...ckfin.uclinux.org> writes:
>
> > It is useful on (broken) legacy serial equipment, where RTS should be
> > completely under the applications control.
> >
> > Glitches on RTS aren't acceptable, and confuse some devices.
>
> Does that mean you can't use TIOCMSET, TIOCM_RTS etc?

No. It is possible to use TIOCMSET only after open syscall. Between
open and ioctl syscals RTS will be asserted. Sometimes it is not
acceptable behaviour.

-Oleksiy
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