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Date: Tue, 05 Jun 2007 13:28:46 -0700
From: Randy Vinson <rvinson@mvista.com>
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To: Andy Fleming <afleming@freescale.com>
Subject: Re: [PATCH 2/8] Add uli1575 pci-bridge sector to MPC8641HPCN dts file.
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Andy Fleming wrote:
>>>
>>> I take full responsibility for that.  The CDS is a strange beast, so
>>> I did some strange things in the DTS.
>>>
>>> The i8259 is on a subsidiary bus, and so it's one bus #1.
>> 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.
> 
> *Waves hands distractingly*
> 
> Pay no attention to the man behind the dts!
> 
> Seriously, though, it's quite fragile right now.  We probably need to
> change u-boot to correctly number those things.  And we should probably
> change the dts files for each board to have any soldered-on pci devices.
> 
> Right now, though, we'd settle for being able to *use* those devices
> under a default setting.
I completely agree an all points. As I get more time to work on
DTS-based hardware, I hope to contribute to the solution. Right now, I'm
trying to handle the i8259 cascade interrupt properly in the context of
Real-Time's threaded interrupts.

Randy V.