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Powering Up the System
In general when the system is plugged in and the circuit breakers on the power
distribution unit(s) are in the on position, the display on the console will be the
MBM> prompt.
When the key switch on the cabinet door or tower OCP is put into the on position
power up will begin and its progress traced on the console screen and on the
OCP display.
Basically what happens is that the microprocessors on the internal LAN go
through a process of self discovery, form a group, and select a leader or primary
MBM that controls testing and the power-up sequence. Once the server
management micros on the LAN form their group, are stable, and the power to
the system is on, SROM tests are run on the CPUs.
There are two SROM tests, one that gets the results of the CPUs power on self
test (POST) which tests the internal caches of the EV7 chip, and one that tests
the chip’s internal Bcache.
With the results of the SROM tests, the server management firmware is able to
build a map of the system.
Once that is done, XSROM tests are run.
XSROM tests are grouped as follows:
• memory (8)
• I/O (8)
• Router (6)
• Interrupts (7)
If tests fail, a new grid is formed that conforms to routing rules and the system is
re-tested. Once the tests complete, pass, and the environment variable
autoconnect is set, the SRM Console gets loaded. The SRM continues to test
and probe until it has a complete view of the system’s configuration and
condition. Once that is accomplished, either the system will boot the operating
system or remain running the console as is the case in the example.
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