linux-kernel - Re: [PATCH] Fix boot-time hang on G31/G33 PC

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Message-ID: <20070828182847.GC32342@colo.lackof.org>
Date:	Tue, 28 Aug 2007 12:28:47 -0600
From:	Grant Grundler <grundler@...isc-linux.org>
To:	Matthew Wilcox <matthew@....cx>
Cc:	linux-pci@...ey.karlin.mff.cuni.cz, linux-kernel@...r.kernel.org,
	Robert Hancock <hancockr@...w.ca>,
	Jesse Barnes <jesse.barnes@...el.com>, Greg KH <greg@...ah.com>
Subject: Re: [PATCH] Fix boot-time hang on G31/G33 PC

On Tue, Aug 28, 2007 at 11:59:08AM -0600, Grant Grundler wrote:
> On Sat, Aug 25, 2007 at 07:55:56PM -0600, Matthew Wilcox wrote:
> > 
> > This patch, loosely based on a patch from Robert Hancock, which was in
> > turn based on a patch from Jesse Barnes, fixes a boot-time hang on my
> > shiny new PC.  The 'conflict' mentioned in the patch in my case happens
> > to be between mmconfig and the graphics card, but it could easily be
> > between any pair of devices if they are left enabled by the BIOS and
> > mappen in the wrong place.
> 
> This issue has come up before:
>     http://www.uwsg.indiana.edu/hypermail/linux/kernel/0212.2/0232.html

Ok...finally found the thread I was looking for:
    http://www.ussg.iu.edu/hypermail/linux/kernel/0212.2/0978.html

or look at the "by Thread" page and search for "disable BAR":
    http://www.ussg.iu.edu/hypermail/linux/kernel/0212.2/index.html

Main difference now is not disabling anything on any sort of Bridge.

Summary: Sizing BARs has never been a very safe operation. We have to
mitigate as best we can and then live with the remaining risks.

cheers,
grant
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