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Date: Tue, 12 Nov 2002 14:33:06 +0000
From: Russell King <rmk@arm.linux.org.uk>
To: Andrew Walrond <andrew@walrond.org>
Cc: linux-kernel@vger.kernel.org
Subject: Re: 2.5.44 serial driver bug with asus pr-dls m/b
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In-Reply-To: <3DD106FA.5060809@walrond.org>; from andrew@walrond.org on Tue, Nov 12, 2002 at 01:49:46PM +0000
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On Tue, Nov 12, 2002 at 01:49:46PM +0000, Andrew Walrond wrote:
> Further to the hanging serial output; disabling DEBUG_AUTOCONF in 8250.c 
> removes this problem.
> 
> So the only remaining problem is when remote console=ENABLED, rather 
> than post only, in the bios. If this is a problem at all ?
> 
> I assume that remote console=enabled redirects the interrupt 0x10 
> ?video? requests used to write to the screen and sends the characters to 
> the serial port instead, rather than just the POST messages. Since the 
> 16bit bios is chucked out when the 32bit linux kernel boots, I don't 
> understand why this upsets anything?

Well, it looks like the serial port at 0x3f8 gets unmapped by the bios
when you set remote console=ENABLED.  The debug output you've sent all
points towards there being no physical port at 0x3f8.

-- 
Russell King (rmk@arm.linux.org.uk)                The developer of ARM Linux
             http://www.arm.linux.org.uk/personal/aboutme.html

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