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    SubjectRe: [PATCH 08/18] PCI, powerpc: Register busn_res for root buses
    On Mon, 2012-04-02 at 05:19 -0500, Milton Miller wrote:
    > In the POWER3 era we had several boxes that split the pci bus number
    > space across domains and RTAS used the bus number to find the correct
    > PHB. This contineed to the first RS64 boxes. By S80 and RS64-III
    > it was obvious that we didn't have enough numbers to continue this
    > ilusion and we added the presently used RTAS calls that take the pci
    > domain as well as bus, device, and function numbers.
    > The bus numbers split across pci domains started with the F50
    > F50 chrp 32 bit platforms.

    Ok, so old CHRPs would have a split as well...

    I think the best is to honor the bus-range property of the PHB as min &
    max values, and if we feel a need to allow the kernel to assign busses
    beyond that, we can always quirk the appropriate platform code.


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