System BIOS
The BIOS performs memory detection and configuration with the following steps:
1.Program the buffer strength control registers based on SPD data and the DIMM slots that are populated.
2.Determine the common CAS latency that can be supported by the DIMMs.
3.Determine the memory size for each DIMM and program the GMCH accordingly.
4.Enable refresh.
8.3.4Boot Error Codes
The BIOS provides visual and audible indications of a failed system boot by using the system’s power LED and the system board speaker. The error conditions are listed in the following table.
Table
Boot Error Codes
Visual (power LED) | Audible (speaker) | Meaning |
|
|
|
Blinks red 2 times @ 1 Hz | 2 beeps | Processor thermal shut down. Check air flow, fan |
|
| operation, and CPU heat sink. |
|
|
|
Blinks red 3 times @ 1 Hz | 3 beeps | Processor not installed. Install or reseat CPU. |
|
|
|
Blinks red 4 times @ 1 Hz | None | Power failure (power supply is overloaded). Check |
|
| storage devices, expansion cards and/or system |
|
| board (CPU power connector P3). |
|
|
|
Blinks red 5 times @ 1 Hz | 5 beeps | |
|
| incorrectly seated DIMM. |
|
|
|
Blinks red 6 times @ 1 Hz | 6 beeps | |
|
| integrated graphics, check/replace system board. |
|
| On system with graphics card, check/replace |
|
| graphics card. |
|
|
|
Blinks red 7 times @ 1 Hz | 7 beeps | PCA failure. Check/replace system board. |
|
|
|
Blinks red 8 times @ 1 Hz | 8 beeps | Invalid ROM (checksum error). Reflash ROM using |
|
| CD or replace system board. |
|
|
|
Blinks red 9 times @ 1 Hz | 9 beeps | System powers on but fails to boot. Check power |
|
| supply, CPU, system board. |
|
|
|
Blinks red 10 times @ 1 Hz | 10 beeps | Bad option card. |
NOTE: Audible indications occur only for the five cycles of the error indication. Visual indications occur indefinitely until power is removed or until error is corrected.
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