HP LH4r HP Netserver LXr Pro8 Memory Board - Page 30
ECC Single-Bit and Multiple-Bit Errors
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Chapter 3 Troubleshooting 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