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From: Segher Boessenkool <segher@kernel.crashing.org>
Subject: Re: [PATCH 09/15] [POWERPC] 86xx: Add uli1575 pci-bridge sector to
	MPC8641HPCN dts file.
Date: Wed, 27 Jun 2007 22:39:14 +0200
To: Andy Fleming <afleming@freescale.com>
Cc: linuxppc-dev@ozlabs.org
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>> -		ranges = <0 f8000000 00100000>;
>> -		reg = <f8000000 00100000>;	// CCSRBAR 1M
>> +		ranges = <00001000 f8001000 000ff000
> [...]
>> +		reg = <f8000000 00001000>;	// CCSRBAR
>
> This can't be right, and I suspect it will break any kernel access to
> the first 0x1000 bytes of the CCSR_BAR space.  reg should actually
> describe the register space of the SOC.  If ranges needs to specify
> that, too, they should be able to be redundant.  But this looks like
> a big hack, to me.  Am I missing something?

"reg" and "ranges" can never overlap really.

Is this the special case where the PHB is visible in
PCI configuration space?

Or, please explain what CCSR_BAR is...


Segher