From: "Bart Van Assche" <bart.vanassche@gmail.com>
To: "Frantisek Rysanek" <Frantisek.Rysanek@post.cz>
Cc: linux-kernel@vger.kernel.org
Subject: Re: What pokes the ISA IO port of 0x211 ?
Date: Mon, 21 Apr 2008 17:51:01 +0200 [thread overview]
Message-ID: <e2e108260804210851j5cd86901r37f65190fac8a024@mail.gmail.com> (raw)
In-Reply-To: <480C92C9.18283.A24BB91B@localhost>
On Mon, Apr 21, 2008 at 1:12 PM, Frantisek Rysanek
<Frantisek.Rysanek@post.cz> wrote:
> I'm dealing with an embedded PC motherboard that contains some custom
> circuitry (GPIO), accessible via an ISA IO range between 0x200 and
> 0x218.
>
> There's an interesting issue with this in recent Linux (tried
> 2.6.22.6 and 2.6.24.2): something probes IO port 0x211 on boot, which
> happens to be an add-on buzzer control port - effectively the kernel
> boot launches an accoustic alarm :-)
>
> Any ideas what this could be?
Did you already have a look at /proc/ioports ? This file should
contain every range of ISA bus address in use by any kernel component.
Bart.
next prev parent reply other threads:[~2008-04-21 15:51 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-04-21 11:12 Frantisek Rysanek
2008-04-21 15:51 ` Bart Van Assche [this message]
2008-04-21 17:40 ` H. Peter Anvin
2008-04-21 20:05 ` Rene Herman
2008-04-21 20:34 ` Rene Herman
2008-04-23 12:19 ` Frantisek Rysanek
2008-04-23 13:56 ` Rene Herman
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