Re: ohci1394 problem (MMIO broken) (was 2.6.25-rc6-git6: Reportedregressions from 2.6.24)

[Benjamin Herrenschmidt]

On Wed, 2008-03-26 at 13:14 +0300, Ivan Kokshaysky wrote:
> 
> Yeah, it's resource issue for sure. The 00:1e.0 is a transparent
> bridge,
> so I blame commit 8fa5913d54f3b1e09948e6a0db34da887e05ff1f
> (PCI: remove transparent bridge sizing). It's wrong for two reasons:
> - we cannot ignore standard windows of a transparent bridge as they
>   always positive decode, so they are potential source of address
> conflicts;
> - that patch just broke whole bridge setup logic in unpredictable way.

The root of the problem is again HW vendors getting wild I think...

Some bridges are fully transparent, some have explicit decode windows
but are also transparent for whatever else and we definitely don't deal
with it.

Ben.


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