Message-ID: <7425061BF9693F4F8C74BA48F43856900DD5AD@AUSXMPS310.aus.amer.dell.com>
From: Robert_Hentosh@Dell.com
To: m.knoblauch@TeraPort.de, robert@exchange.dell.com
Cc: linux-kernel@vger.kernel.org
Subject: RE: [PATCH] reboot=bios is invalidating cache incorrectly
Date: Tue, 23 Apr 2002 15:02:47 -0500
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Sender: linux-kernel-owner@vger.kernel.org


> -----Original Message-----
> From: Martin Knoblauch [mailto:Martin.Knoblauch@TeraPort.de]
> Sent: Tuesday, April 23, 2002 8:51 AM
> Subject: Re: [PATCH] reboot=bios is invalidating cache incorrectly
> 
> 
> > [PATCH] reboot=bios is invalidating cache incorrectly
> > 
> > 
> > This patch applies cleanly to 2.4.18 and 2.5.8. It probably 
> also works
> > with all 2.2.x, 2.4.x and 2.5.x kernels.
> > 
> > This fixes a long standing bug that prevented reliable 
> reboots on some
> > platforms.
> > 
> Robert,
> 
>  care to specify which platforms? :-) I ask because I am experiencing
> reboot hangs between BISO and lilo on Tyan 2462 boards. Apparently
> others see similar things.
> 

Martin,

I only have extensive experience with Dell's Server platforms.  But because
of the nature of the error, it can happen on any platform using reboot=bios.

On the platforms I was debugging.. invalidating the cache left a bunch of
ADD's in memory followed by a JMP to itself.  So you would see the message
"rebooting system" but then you would never get a blank screen and BIOS
posting (the reboot vector was never called).

- Robert
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