Multi-processor system for selecting a processor which has successfully written it's ID into write-once register after system reset as the boot-strap processor

TLDR: Bootstrap processor selection as discussed by the authors employs system logic having a memory-mapped sticky register, e.g. write-once, register, multiple processors, and a firmware routine through which the processors may store values to and load values from the sticky register.

Abstract: A bootstrap processor selection mechanism for a computer system employs system logic having a memory-mapped sticky, e.g. write-once, register, multiple processors, and a firmware routine through which the processors may store values to and load values from the sticky register. When a reset event is detected, the processors vie for access to the sticky register, using the firmware routine. The first processor that successfully stores its associated processor ID to the sticky register, locks the register against subsequent store operations by the remaining processors. Each processor loads the value stored in the sticky register and compares it with its processor ID to determine whether it is the bootstrap processor.