Ecc Single-Bit And Multiple-Bit Errors - HP D7171A - NetServer - LPr Installation Manual

Chapter 3
Standard BIOS Error Messages
Several different situations generate visual or auditory error messages which
appear in the Event Log Report Utility:
No memory board detected. If a memory board is not installed, the
system generates 11 beeps and halts.
Memory board detected, but no DIMMs found. If no DIMMs are
installed on the board, you will hear three beeps and the system hangs.
Mixed DIMM sizes. HP will not support DIMMs of varying sizes. If
these are mixed in a single bank, the system continues to run, and
memory downsizing occurs. Appropriate POST error codes will be
generated. After the first boot, the errors will not be displayed.
Mixed DIMM speed. HP only supports DIMMs running at 100 MHz
(Megahertz). Should you mix DIMMs of different speeds in the same
bank, the system detects this error. No message appears, but the system
may run unreliably.
ECC (Error Checking and Correction) Single-Bit Errors. These errors
may be detected in POST as in run-time. Appropriate POST error codes
will be generated.
ECC (Error Checking and Correction) Multiple-Bit Errors. Such
errors may be detected during POST as well as run-time. Multiple Bit
Errors are not corrected.
NOTE
Memory downsizing will occur during POST if ECC errors
occur. In this case, you will see error codes #310, 311, 312
and/or 313.

ECC Single-Bit and Multiple-Bit Errors

Two types of errors may occur during boot-up or runtime operation:
ECC Single-bit errors, which are divided into two types. The memory
controller corrects "soft" single-bit errors without any effect on the system.
NOTE
Once an error is corrected, a System Management Interrupt
(SMI) occurs without impacting system operation.
26
Troubleshooting