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

[Grant Grundler <grundler@parisc-linux.org>]

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