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
Date: Tue, 12 Nov 2002 14:33:06 +0000 [thread overview]
Message-ID: <20021112143306.A14369@flint.arm.linux.org.uk> (raw)
In-Reply-To: <3DD106FA.5060809@walrond.org>; from andrew@walrond.org on Tue, Nov 12, 2002 at 01:49:46PM +0000
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
prev parent reply other threads:[~2002-11-12 14:26 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-10-24 19:48 2.5.44 serial driver bug with asus pr-dls m/b Andrew Walrond
2002-10-24 19:58 ` Andrew Walrond
2002-11-03 13:58 ` Russell King
2002-11-06 21:30 ` Andrew Walrond
2002-11-12 11:43 ` Andrew Walrond
2002-11-12 12:12 ` Andrew Walrond
2002-11-12 12:52 ` Andrew Walrond
[not found] ` <3DD106FA.5060809@walrond.org>
2002-11-12 14:33 ` Russell King [this message]
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