From: Vojtech Pavlik <vojtech@suse.cz>
To: john stultz <johnstul@us.ibm.com>
Cc: greg kh <greg@kroah.com>, lkml <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH] x445 usb legacy fix
Date: Tue, 20 Jul 2004 07:02:43 +0200 [thread overview]
Message-ID: <20040720050243.GC313@ucw.cz> (raw)
In-Reply-To: <1090286508.1388.434.camel@cog.beaverton.ibm.com>
On Mon, Jul 19, 2004 at 06:21:49PM -0700, john stultz wrote:
> Greg, All,
> Apparently there is an issue w/ the IBM x440/x445's BIOS's USB Legacy
> support. Due to the delay in issuing SMI's across the IOAPICs, its
> possible for I/O to ports 60/64 to cause register corruption.
>
> The solution is to disable the BIOS's USB Legacy support early in boot
> (via PCI quirks) for x440/x445 systems.
>
> This is the same method posted to lkml here (Originally written by
> Vojtech): http://www.ussg.iu.edu/hypermail/linux/kernel/0405.3/1712.html
>
> (Use the following link for the raw mbox email)
> http://lkml.org/lkml/mbox/2004/5/31/97
>
> While Greg was cautious that this method couldn't always be used, I've
> created a patch that applies on top of Vojtech's that creates a boot
> option which allows you to specify "no-usb-legacy". Additionally this
> patch enables the "no-usb-legacy" option by default for x440/x445
> systems.
>
> Please consider for inclusion (along with the patch linked to above)
> into your tree.
I think we'll go with the original patch that disables it
unconditionally, right, Greg?
--
Vojtech Pavlik
SuSE Labs, SuSE CR
prev parent reply other threads:[~2004-07-20 5:01 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-07-20 1:21 [PATCH] x445 usb legacy fix john stultz
2004-07-20 5:02 ` Vojtech Pavlik [this message]
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