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General Rules for System Configuration
D-3
D
D.1.3 Selecting the System Master Board
Note – The system master board must have the highest-revision PROM set.
Also, if your system has OBP patches stored in NVRAM, these must be erased
before assigning a board having different revision PROM set as system master.
This is required because OBP patches are PROM-version specific. Use the
set-
default nvramrc
command at the OPB
ok
prompt to erase patches before
powering down the system for board reassignment.
Determine which board is the candidate to become the system master. Before
installing a given board:
1. Determine the dash-revision level of Boot PROMs installed on the board.
The level is expressed by the last two digits in the part number, as in:
525-xxxx-yy where “yy” conveys the dash-revision level.
2. Likewise, examine other system boards installed (or to be installed) in the
card cage to determine the dash-revision level of PROMs on these boards.
3. Identify the board to be system master:
If a board has a higher dash-revision level Boot PROM than the others, it
must be the system master.
If two or three have higher levels, than one from that pool of boards must be
the system master.
4. Install the candidate-board into slot 0 as system master.
Boot PROMs may be hidden because they reside beneath the SBus card in slot
0, if installed. See Figure D-1. Remove the SBus card as required to expose the
OBP for examination to determine the OBP revision level.