Re: [PATCH] [POWERPC] 85xx: Add basic Uniprocessor MPC8572 DS port

Kumar Gala
2007-09-11T17:56:36Z

On Sep 11, 2007, at 12:48 PM, Scott Wood wrote:

> Olof Johansson wrote:
>> On Tue, Sep 11, 2007 at 12:21:30PM -0500, Scott Wood wrote:
>>> Olof Johansson wrote:
>>>> On Tue, Sep 11, 2007 at 11:00:28AM -0500, Kumar Gala wrote:
>>>>> well the ifdefs are orthogonal. We don't have a way of knowing
>>>>> primary from the device tree today.
>>>> How about something like "fsl,primary-phb" in the bus device
>>>> node? I don't
>>>> know, maybe it's already been discussed and turned down for some
>>>> reason.
>>> It's more of a Linux issue than anything to do with the hardware.
>>
>> That doesn't stop firmware from telling linux which bus is the
>> primary
>> one on the system to help out.
>
> The entire notion of a "primary" PCI bus is due to a Linux flaw.
>
> If we did put it in the device tree, it should be something like
> "linux,primary-phb". But since Linux can tell from the node's
> children,
> there doesn't seem to be much point.

Once someone rights code to do this I'm happy to change over. I took
this model of explicitly knowing the primary PHB from the pmac code.

- k