Dimm Failure; Openboot Prom On-Board Diagnostics - Sun Microsystems Sun Blade 100 Service Manual

a. With the negative probe of the DVM placed on a connector ground (Gnd) pin,
position the positive probe on each power pin.
See Section B.1 "Power Supply Connectors" on page B-1.
b. Verify voltage and signal availability as listed in
6. After you finish testing the power supply, remove the wrist strap, replace the
system cover, and power on the system as described in Chapter 9 "Finishing
Component Replacement."
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.
TABLE 4-2
DIMM Slot
DIMM0 (U2)
DIMM1 (U3)
DIMM2 (U4)
DIMM3 (U5)
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 4-6
Section 4.6.2 "Watch-Net and Watch-Net-All Diagnostics" on page 4-6
Section 4.6.3 "Probe-IDE Diagnostic" on page 4-8
Section 4.6.4 "Test device alias, device path, -All Diagnostic" on page 4-8
DIMM Physical Memory Address
Physical Address Range
0 to 512MB (0 to 0.5GB)
512MB to 1024MB (0.5GB to 1GB)
1024MB to 1536MB (1GB to 1.5GB)
1536MB to 2048MB (1.5GB to 2GB)
on page B-2.
TABLE B-1
DIMM Starting Address (Hex)
0X 00000000
0X 20000000
0X 40000000
0X 60000000
Chapter 4 Troubleshooting Procedures 4-5