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| Diagnostic LED Decoder |
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Check |
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G=Green, R=Red, A+Amber | Description | |||||
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D2 | R | R | G | R | Disable CACHE beforfe | |
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| memory detection. | |
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| Execute full memory sizing | |
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| module. Verify that flate | |
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| mode is enabled. | |
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D3 | R | R | G | A | Disable CACHE before | |
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| memory detection. | |
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| Execute full memory sizing | |
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| module. Verify that flat | |
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| mode is enabled. | |
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D4 | R | A | OFF | R | Test base 512KB memory. | |
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| Adjust policies and cache | |
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| first 8MB. | |
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D5 | R | A | OFF | A | Bootblock code is copied | |
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| from ROM to lower system | |
memory and control is given to it. BIOS now executes out of RAM.
D6 | R | A | G | R | Both key sequence and |
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| OEM specific method is |
checked to determine if BIOS recovery is forced. Main BIOS checksum is tested. If BIOS recovery is necessary, control flows to checkpoint E0. See Bootblock Recovery Code Checkpoints section of document for more information.
