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From: Andy Fleming <afleming@freescale.com>
Subject: Re: [PATCH 2/8] Add uli1575 pci-bridge sector to MPC8641HPCN dts file.
Date: Thu, 7 Jun 2007 11:21:41 -0500
To: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: "linuxppc-dev@ozlabs.org" <linuxppc-dev@ozlabs.org>
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On Jun 6, 2007, at 02:09, Benjamin Herrenschmidt wrote:

> On Mon, 2007-06-04 at 15:31 -0700, Randy Vinson wrote:
>> Actually, that's not strictly true. If a card containing a P2P bridge
>> is
>> installed into PCI slot 4, the i8259 will end up on a bus that is not
>> numbered bus 1. I've often wondered how something like that is  
>> handled
>> in the DTS.
>
> The bus number shouldn't matter as long as low IO cycles are properly
> forwarded to it.

Right.  Unless there's an interrupt mapping, which has to include the  
bus number in the filter.  When that happens, parsing the interrupt  
map for the i8259's mapping fails because its address doesn't match.

Andy