Method and service and computer program code for broadcast of interface group bring-up in a multiprocessor computer system having multiple nodes

A service for use in a computer system initiation, comprising the steps of calibration of interfaces in a computer system that has multiple interfaces across multiple chips and nodes by

• performing with hardware of said computer system a hardware initialization
• by setting scan latches group assignments for interfaces in said computer system to be calibrated establishing a plurality of broadcast groups, each group assignment becoming after group assignment an identification of said interfaces as part of a specific one of said plurality of broadcast groups, and
• once said broadcast groups are established, during initialization sending calibration commands to the interfaces using pre-existing hardware to a selected combination of said groups in parallel for performing reads and writes as part of a broadcast group.

A computer system media for storage of and providing program code for execution by said computer system for calibration of interfaces in a computer system that has multiple interfaces across multiple chips and nodes, comprising:

• a code set for establishing the setting of scan latches group assignments for interfaces in said computer system to be calibrated establishing a plurality of broadcast groups, each group assignment becoming after group assignment an identification of said interfaces as part of a specific one of said plurality of broadcast groups whereby
• once said broadcast groups are established, during initialization the program code establishes paths in said computer system for sending calibration commands to the interfaces using pre-existing hardware to a selected combination of said groups in parallel for performing reads and writes as part of a boardcast group.