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From: John Baldwin <jhb@freebsd.org>
To: Baptiste Daroussin <bapt@freebsd.org>
Date: Wed, 28 Mar 2012 14:38:42 -0400
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	(bigwig.baldwin.cx); Wed, 28 Mar 2012 14:43:08 -0400 (EDT)
Cc: freebsd-current@freebsd.org
Subject: Re: No disks usable on a P5NE MB (aka regession is r219737)
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On Tuesday, November 15, 2011 6:12:53 pm Baptiste Daroussin wrote:
> On Tue, Nov 15, 2011 at 12:46:41PM -0500, John Baldwin wrote:
> [...]
> > and
> > > 10 remove that block :
> > > http://people.freebsd.org/~bapt/workaround-to-boot-p5ne.diff
> > 
> > Yeah, the problem is that NVIDIA chipsets seem to have really odd behavior in 
> > that once you turn MSI mapping on for a given node in the HyperTransport tree 
> > it expects all child devices to only use MSI and not INTx.  Linux has a lot of 
> > quirk code to try to handle this by only turning on the mapping window when 
> > MSI is enabled for a given device.  However, it has lots of hacks to try to 
> > find the right Host-PCI Bridge that a given device is a child of.  I'm mostly 
> > tempted to just disable MSI on NVIDIA chipsets that have these issues rather 
> > than adding the same number of quirks.  However I haven't really had time to 
> > sit down and look at this.
> > 
> 
> Thanks for reply, if you can do some testing for you if you want.

Please try http://www.FreeBSD.org/~jhb/patches/hostb_htmsi.patch

-- 
John Baldwin