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

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Message-Id: <200703081832.29274.rgetz@blackfin.uclinux.org>
Date:	Thu, 8 Mar 2007 18:32:29 -0500
From:	Robin Getz <rgetz@...ckfin.uclinux.org>
To:	"Russell King" <rmk+lkml@....linux.org.uk>
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 8 Mar 2007 15:40, Russell King pondered:
> On Thu, Mar 08, 2007 at 03:23:39PM -0500, Robin Getz wrote:
> > Right - We both agree - And setting console=/dev/null in the bootargs
> > still does not help.
>
> Ok, good.
>
> > When the kernel initializes the UART Port, it asserts RTS - which
> > confuses the host it is attached to (in this case, the Linux system
> > is the serial peripheral).
>
> ... which occurs /after/ userspace is up and running, when sysfs is
> available.  So putting it in sysfs is reasonable.

Hmm - maybe I don't understand things then.

Today - RTS gets asserted when serial_core calls uart_startup(), which is 
pretty early in the boot process (unless it is loaded as a module - which I'm 
not doing).

-Robin
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