Service manual

1
All CPUs execute their on-board self-tests at the beginning of the power-
up tests. On the STF line of the self-test display, a plus sign (+) is shown
for every module whose self-test passes (see Section 3.6).
2
The boot processor is determined as described in Section 3.4. On the
first BPD line, the letter B corresponds to the processor selected as
boot processor. Because the processors have not yet completed their
power-up tests, the designated processor may later be disqualified from
being boot processor. For this reason, the BPD line appears twice in
the self-test display.
3
The boot processor tests all memory modules and then prints the results
of self-test, lines NODE, TYP, STF, and BPD on the self-test display.
The boot processor then signals all CPUs to start running the extended
test.
4
All CPUs execute an extended test using the memories. On the ETF
line of the self-test display, a plus sign (+) is shown for every module
that passes extended test.
5
If all CPUs pass the extended test, the original boot processor selection
is still valid. Lines STF and ETF would be identical for all the
processors.
The yellow LED is lit on all processor modules that pass both power-up
tests. On the secondary processors, the red LED next to the yellow one
is also lit. On the boot processor, this red LED is off (see Figure 3–7).
If the original boot processor fails the extended test (indicated by a
minus sign (–) on line ETF), a new boot processor is selected. On the
second BPD line, the letter B corresponds to the processor finally
selected as boot processor.
<REFERENCE>(xyp) Scalar Processor 3–13