linux-kernel - Re: [PATCH] PCI MMConfig: Detect and support the E7520 and the 945G/GZ/P/PL

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Date:	Fri, 1 Dec 2006 01:19:01 +0100
From:	Olivier Galibert <galibert@...ox.com>
To:	Andi Kleen <ak@...e.de>, linux-pci@...ey.karlin.mff.cuni.cz,
	"Hack inc." <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...l.org>
Subject: Re: [PATCH] PCI MMConfig: Detect and support the E7520 and the 945G/GZ/P/PL

On Mon, Nov 27, 2006 at 09:24:06PM +0100, Olivier Galibert wrote:
> On Mon, Nov 27, 2006 at 08:07:48PM +0100, Andi Kleen wrote:
> > Is that with just the code movement patch or your feature patch
> > added too? If the later can you test it with only code movement
> > (and compare against vanilla kernel). at least code movement
> > only should behave exactly the same as unpatched kernel.
> 
> You misread.  Unpatched kernel does not work.  That's why I gave the
> git reference of the kernel too.  Patched kernel does not work either,
> unsurprisingly (bios gives correct tables on that box).

Ok, I'm trying to debug it, and it's a pain.  It's a timing issue,
mmcfg write accesses are too slow for something.  The get_base_addr()
call is enough to slow things down too much, which explains why the
fundamentally simpler x86-64 code works without a hitch.

Finding out what it is too slow for, though, is an interesting
proposition.  It's not entirely obvious it is actually related to the
sata accesses.

  OG.


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