QUnder what circumstances does the Macintosh generate a Type 1 cycle? For machines with a single PCI bus, it seems they are never generated.
AAll of Apple's PCI PowerMac CPUs support hierarchical PCI buses. Depending on the PCI bus environment, the PPC host to PCI bridge (Bandit chip) will generate Configuration Type 0 commands to select a device on the PCI bus where the cycle is being run, and Configuration Type 1 commands to select devices behind a PCI-to-PCI bridge. (Multi-Function PCI cards, for example, use a PCI-to-PCI bridge.)