o Determine the number of LAWs in a way the is future proof. Only the

    MPC8555(E) has 8 LAWs, so don't make that the default case. Current
    processors have 12 LAWs so use that as the default instead.
o   Determine the target ID of the PCI/PCI-X and PCI-E controllers in
    a way that's more future proof. There's almost a perfect mapping
    from HC register offset to target ID, so use that as the default.
    Handle the MPC8548(E) specially, since it has a non-standard target
    ID for the PCI-E controller. Don't worry about whether the processor
    implements the target ID here, because we should not get called for
    PCI/PCI-X or PCI-E host controllers that don't exist.

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