Configuration Accesses: Reaching All Devices
The process of HyperTransport device configuration depends on software being able to access the 256 byte configuration space of each function in each device on each bus in the system. Configuration cycles originate at the CPU that executes the configuration software; the cycles then move in the direction of the target. This section compares the PCI and HyperTransport methods used to reach the configuration space of a device which may reside on a bus many levels deep in the topology.
Implied in plug-and-play address assignment on buses such as PCI and HyperTransport is the fact that until it is discovered and assigned an address range by low-level software, a device can't claim normal memory or I/O ...
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