Chapter 7 Power-On Self-Test 7-19
At address 00000000.00000000, there was a test pattern mis-match. A string of
a5a6a5a5 was observed when a string of a5a5a5a5 was expected.
The second error message identified where the fault was located:
The DIMM in slot DIMM0 was at fault. Several other error messages were displayed,
and a summary was provided:
The DIMM in slot DIMM0 should be replaced. Because memory works in pairs, POST
disables both slots DIMM0 and DIMM1. POST returns system status and control back
to the OpenBoot PROM which then displays messages regarding the results of POST.
For example:
Because of the error, two DIMM slots have been disabled (bank0), so only half of
the original memory (2048/4096MB) is available for use.
Note – If only two DIMMs were installed and this set of errors occurred, the system
would have beeped 3 times and powered off.
0>ERROR: TEST = Probe and Setup Memory
0>H/W under test = CPU0: Bank 0 DIMM0 side 0, Motherboard
0>Repair Instructions: Replace items in order listed by ’H/W under
test’ above
0>MSG = Pin 72 failed on CPU0: Bank 0 DIMM0 side 0, Motherboard
0>END_ERROR
0>ERROR:
0> POST toplevel status has the following failures:
0> CPU0: Bank 0 DIMM0 side 0, Motherboard
0> CPU0: Bank 1 DIMM0 side 1, Motherboard
0>END_ERROR
Power On Selftest Failed.
CPU: 0 cause: CPU0: Bank 0 DIMM0 side 0, Motherboard
ERROR: CPU0 has 2048/4096MB of memory disabled
ERROR: POST failed
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