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Date: Fri, 17 Dec 2004 13:46:46 -0800
From: Greg KH <greg@kroah.com>
To: "Maciej W. Rozycki" <macro@mips.com>
Cc: linux-kernel@vger.kernel.org, Chris Dearman <chris@mips.com>,
       "Maciej W. Rozycki" <macro@linux-mips.org>
Subject: Re: [PATCH] Don't touch BARs of host bridges
Message-ID: <20041217214646.GB22597@kroah.com>
References: <Pine.LNX.4.61.0412092349560.6535@perivale.mips.com>
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On Fri, Dec 10, 2004 at 12:20:40AM +0000, Maciej W. Rozycki wrote:
> Hello,
> 
>  BARs of host bridges often have special meaning and AFAIK are best left 
> to be setup by the firmware or system-specific startup code and kept 
> intact by the generic resource handler.  For example a couple of host 
> bridges used for MIPS processors interpret BARs as target-mode decoders 
> for accessing host memory by PCI masters (which is quite reasonable).  
> For them it's desirable to keep their decoded address range overlapping 
> with the host RAM for simplicity if nothing else (I can imagine running 
> out of address space with lots of memory and 32-bit PCI with no DAC 
> support in the participating devices).
> 
>  This is already the case with the i386 and ppc platform-specific PCI 
> resource allocators.  Please consider the following change for the generic 
> allocator.  Currently we have a pile of hacks implemented for host bridges 
> to be left untouched and I'd be pleased to remove them.

I've applied this to my trees, and it will show up in the next -mm
release, and then on to Linus's tree after 2.6.10 is out.

Oh, and next time, I need a "Signed-off-by:" line as per
Documentation/SubmittingPatches.

thanks,

greg k-h