Bus Enumeration: How a System Finds Its Devices
Enumeration is the start-up walk in which the system asks a bus what is plugged into it, and each device answers with an identity and a list of the resources it needs. The result is a list of devices the operating system can match drivers against, which is why plugging in a card is usually enough to make it work. Buses that cannot be asked, like the wiring inside a phone chip, need the device list supplied some other way.
Questions this Concept answers
- Why do the buses inside a system-on-chip need their device list supplied from somewhere else?
PCI Bus Enumeration Explained-Free Linux Device Drivers Training Online
PCI bus enumeration is the start-up walk in which software asks the bus what is plugged in. Starting at the root complex, it checks each slot's header type: an endpoint is a leaf, while a bridge gets…