3-6 Sun Ultra 45 and Ultra 25 Workstations Service and Diagnostics Manual • May 2006
3.2.2 OpenBoot PROM Memory Message
During workstation startup, OpenBoot PROM checks for DIMM type and DIMM
manufacturer.
TABLE 3-1 shows some checks and the actions taken by the OpenBoot
PROM.
Note – If you only have one DIMM pair installed and those DIMMs have different
architectures, the OpenBoot PROM displays a message, and powers off.
Each CPU has four memory slots. The two blue slots make up physical bank 0 and
the two black slots make up physical bank 1 (
FIGURE 3-4).
If a problem is found, OpenBoot PROM references memory by bank, for example:
The preceding message means that each of the two DIMMs in the bank 0 slots comes
from a different manufacturer. The workstation still attempts to use the DIMMs.
This message means that each of the two DIMMs in the black slots has a different
internal memory layout. The workstation does not use the DIMMs.
The workstation must have at least one functional pair of DIMMs to display a
message. A workstation with more than one pair of DIMMs might display more than
one message.
TABLE 3-1 OpenBoot PROM Memory Checks and Actions
Check Message Action Taken by System
Wrong DIMM type
NOTICE - CPUx Banky DIMMs
are incorrect type.
A message is displayed and the
workstation powers off.
DIMMs in a pair have
different architecture
NOTICE - CPUx Banky DIMMs
have different
architectures and will not
be used.
Workstation does not use dissimilar
DIMMs. A message is displayed and the
workstation continues to boot; the
workstation attempts to use the DIMM
pair.
DIMMs in a pair are from
different manufacturers
NOTICE - CPUx Banky DIMMs
are from different
vendors.
Workstation uses DIMMs from different
manufacturers. A message is displayed
and the workstation continues to boot.
NOTICE - CPU0 Bank 0 DIMMS are from different vendors.
NOTICE - CPU0 Bank 1 DIMMs have different architectures and will
not be used.
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