Re: [PATCH] Don't touch BARs of host bridges
From: Greg KH
Date: Fri Dec 17 2004 - 16:49:23 EST
On Fri, Dec 10, 2004 at 12:20:40AM +0000, Maciej W. Rozycki wrote:
> 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
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