Device control and configuration

An article comprising:

• a storage medium having stored thereon instructions that when executed by a machine result in the following:
• controlling, at least in part, by a first device, whether a first signal line of a second device is coupled to a bus, and whether a second signal line of a third device is coupled to the bus;
• and
• after the first and second signal lines are coupled to the bus, supplying from the first device to the second and third devices, via the first and second signal lines, one or more signals that, after being received by the second and third devices, permit, at least in part, at least one of control and configuration by the first device of the second and third devices;
• a first circuit card comprising the first device, a second circuit card comprising the second device, the first device being coupled to the second device and to the third device via a mechanism that permits the first device to control whether the signals lines are coupled to the bus, the mechanism also permitting the first device to receive one or more interrupt signals from at least one of the second device and the third device, the one or more signals comprising Initialization Device Select (IDSEL) signals.

A system comprising:

• a circuit board including a bus, a first bus interface, a second bus interface, and at least one input/output (I/O) device;
• and
• a first device and a second device capable of being coupled to the bus via the first interface and the second interface, respectively, and when the first device and the second device are coupled to the bus via the first interface and the second interfaces, the first device is capable of controlling, at least in part, whether a first signal line of the second device is coupled to the bus and whether a second signal line of the at least one I/O device is coupled to the bus, and after the first and second signal lines are coupled to the bus, the first device is also capable of supplying to the second device and to the at least one I/O device, via the first and second signal lines, one or more signals that, after being received by the second device and by the at least one I/O device, permit, at least in part, at least one of control and configuration by the first device of the second device and the at least one I/O device;
• a first circuit card comprising the first device, a second circuit card comprising the second device, the first device being coupled to the second device and to the I/O device via a mechanism that permits the first device to control whether the signals lines are coupled to the bus, the mechanism also permitting the first device to receive one or more interrupt signals from at least one of the second device and the I/O device, the one or more signals comprising Initialization Device Select (IDSEL) signals.