Service manual

Power-Up 2-19
Example 2–1 shows the SCM monitor display for a four QBB system with eight
CPUs. Auxiliary power is applied to the system when the AC circuit breakers
are put in the On position.
Refer to Example 2–1.
When power is applied, an eligible SCM with the lowest csb node ID
number connected to the OCP and running from its application image
becomes master of the CSB. It checks its EEPROM and self-test, restores
environment variables (EVs), and sets up data structures and CSB
communication channels.
The SCM polls all addresses on the CSB.
The state of the OCP is ignored until after the SCM maps the system. The
time that the SCM ignores the OCP has a default of 12 seconds.
The modem port is polled. Had there been a modem attached, data
describing its configuration would have been displayed. See the
AlphaServer GS80/160/320 User’s Guide or Firmware Reference Manual.
Two PCIs are found, one at CSB node 10 (PBP0), and the other at node 11
(PBP1). Both have two power supplies PS1 and PS2 and both have a single
remote I/O riser (IOR0).
Node 40, the hierarchical switch, is added to the CSB and cables
connecting it to global ports 0, 1, 2, and 3 are found. In this example only
one of the two possible H-switch power supplies is present.
Information messages connecting nodes 30, 31, 32, and 33 to the CSB are
displayed indicating the presence of four QBBs.
Continued on next page