[PATCH 09/15] [POWERPC] 86xx: Add uli1575 pci-bridge sector to MPC8641HPCN dts file.

[Kumar Gala]

On Jun 27, 2007, at 4:21 PM, Segher Boessenkool wrote:

>>>>>>> -		ranges = <0 f8000000 00100000>;
>>>>>>> -		reg = <f8000000 00100000>;	// CCSRBAR 1M
>>>>>>> +		ranges = <00001000 f8001000 000ff000
>>>>>>> +		reg = <f8000000 00001000>;	// CCSRBAR
>
>>> There is "BAR" in the name, so it is a movable range?  Where
>>> is the base address set?
>>
>> in a MMIO register in the space itself.
>
> Oh, *great* design.</sarcasm>

its not that bad ;)

>>> What is the relationship between (in the example) the address
>>> ranges x'f800_0000+1000 and x'f800_1000+ff000?
>>
>> uugh, not sure what that's all about.
>
> Reading back I see that the CCSR region is 1MB, and only the
> first 4kB are for this PHB.  What is the rest of this range
> used for -- devices on this PCI bus, other SoC devices, ...?

No, the first 4kB are SOC/platform level config registers (high level  
window setup, CCSR location, etc).

The PHB registers are somewhere in the middle (0x8000, I think).  All  
the children devices (enet, PHBs, etc) live in the 1M block.

I think my original idea was the reg property on the SOC node was for  
the first 4k block that held the SOC config registers.  I think what  
Wade did is correct since the reg property on the SOC node isnt going  
to get translated through the ranges property and that they should be  
mutually exclusive.

- k