linux-kernel - Re: drivers/pci/probe.c patch in 2.6.20.4 causes 'cannot adjust BAR0 (not I/O)' on NVidia MCP51

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Date:	Mon, 26 Mar 2007 05:08:03 +0200
From:	Adrian Bunk <bunk@...sta.de>
To:	"Kevin P. Fleming" <lkml@...leming.us>
Cc:	Alan Cox <alan@...rguk.ukuu.org.uk>, Greg KH <greg@...ah.com>,
	Jan Beulich <jbeulich@...ell.com>, Alan Cox <alan@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Bartlomiej Zolnierkiewicz <bzolnier@...il.com>,
	linux-kernel@...r.kernel.org
Subject: Re: drivers/pci/probe.c patch in 2.6.20.4 causes 'cannot adjust BAR0 (not I/O)' on NVidia MCP51

On Sun, Mar 25, 2007 at 07:25:46PM -0700, Kevin P. Fleming wrote:
> Adrian Bunk wrote:
> > It also adds PCI_BASE_ADDRESS_SPACE_IO to the flags which it didn't 
> > without the patch.
> 
> As an experiment I modified 2.6.20.4 to _only_ remove that value from
> the combined value for the flags and it did not help in any noticeable
> way. I can reliably boot and operate the machine with the original patch
> reversed, though.

OK thanks, then it's something else.

I see only one more thing that might make any difference:
Perhaps we are not seeing the problematic operation due to the different 
loglevel?

Please change in the third printk() the patch adds the KERN_INFO to 
KERN_WARNING.

If you get a "...trying to change BAR..." before it hangs, remove the 
pci_write_config_dword() line - this should then fix it.

cu
Adrian

-- 

       "Is there not promise of rain?" Ling Tan asked suddenly out
        of the darkness. There had been need of rain for many days.
       "Only a promise," Lao Er said.
                                       Pearl S. Buck - Dragon Seed

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