Owner`s manual

Each processor has an image of the console program and boot code in ROM,
but there is only one console terminal and a single system control panel.
One processor is designated as the boot processor (or primary processor) and
becomes the primary communicator to the console program. The signals
from the console terminal and system control panel are bused on the XMI
and are driven by the boot processor.
At power-up or initialization of the system, the console program in each
processor begins parallel execution. Each processor performs self-test and
then checks with the otherprocessorsto determine which processor becomes
the boot processor. The boot processor is the processor with the lowest node
ID number, passing self-test, that is eligible to become the boot processor
(see Section 5.18.2).
Once the boot processor has been determined, all other processors on the
system become secondary processors. The console programs in secondary
processors wait for commands from the boot processor.
Booting 4–11