Chapter 4 Troubleshooting Procedures 4-5
4.5 DIMM Failure
At times, the operating environment, diagnostic program, or POST might not
display a DIMM location (U number) as part of a memory error message. In this
situation, the only available information is a physical memory address and failing
byte (or bit). The following table lists physical memory addresses that can be used to
locate a defective DIMM. For more information on POST diagnostics, see Section 3.1,
“POST Overview” on page 3-1.
4.6 OpenBoot PROM On-Board Diagnostics
The following sections describe the OpenBoot PROM on-board diagnostics. To
execute the OpenBoot PROM on-board diagnostics, the system must be at the ok
prompt. The OpenBoot PROM on-board diagnostics are described as follows:
■ Section 4.6.1, “Watch-Clock Diagnostic” on page 4-5
■ Section 4.6.2, “Watch-Net and Watch-Net-All Diagnostics” on page 4-6
■ Section 4.6.3, “Probe-IDE Diagnostic” on page 4-7
4.6.1 Watch-Clock Diagnostic
The watch-clock diagnostic reads a register in the NVRAM/TOD chip and displays
the result as a seconds counter. During normal operation, the seconds counter
repeatedly increments from 0 to 59 until interrupted by pressing any key on the Sun
TABLE 4-2 DIMM Physical Memory Address
DIMM Slot Physical Address Range DIMM Starting Address (Hex)
DIMM0 (U2)
DIMM1 (U3)
0 to 512MB (0 to 0.5GB)
512MB to 1024MB (0.5GB to 1GB)
0X00000000
0X40000000
DIMM2 (U4)
DIMM3 (U5)
1024MB to 1536MB (1GB to 1.5GB)
1536MB to 2048MB (1.5GB to 2GB)
0X80000000
0XC0000000
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