
Check | Diagnostic LED decoder | Description | |||
point | G=Green, R=Red, O=Orange |
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AB | O | Off | O | G | Prepare BBS in Int 19 boot. |
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AC | O | G | R | Off | End of POST initialization of chipset registers. |
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B1 | R | Off | R | O | Save system context for ACPI. |
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00 | Off | Off | Off | Off | Pass control to OS Loader (typically INT19h). |
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- | - | - | - | OEM POST Error. This range is reserved for chipset vendors and | |
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| system manufacturers. The error associated with this value may |
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| be different from one platform to the next. |
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Bootblock initialization code checkpoints
The Bootblock initialization code sets up the chipset, memory and other components before system memory is available. The following table provides the diagnostic LED code for these checkpoints and describes the type of checkpoints that may occur during the bootblock initialization:
Check | Diagnostic LED decoder | Description | |||
point | G=Green, R=Red, O=Orange |
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Before | R | R | Off | O | Early chipset initialization is done. Early super I/O initialization |
D1h |
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| is done, including RTC and keyboard controller, NMI is disabled. |
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D1 | R | R | Off | O | Perform keyboard controller BAT test. Check if waking up from |
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| power management suspend state. Save |
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| in scratch CMOS. |
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D0 | R | R | Off | R | Go to flat mode with 4 GB limit and GA20 enabled. Verify the |
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| bootblock checksum. |
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D2 | R | R | G | R | Disable CACHE before memory detection. Execute full memory |
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| sizing module. Verify that flat mode is enabled. |
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D3 | R | R | G | O | If memory sizing module not executed, start memory refresh and |
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| do memory sizing in Bootblock code. Do additional chipset |
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| initialization. |
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D4 | R | O | Off | R | Test base 512 KB memory. Adjust policies and cache first 8 MB. |
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| Set stack. |
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D5 | R | O | Off | O | Bootblock code is copied from ROM to lower system memory and |
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| control is given to it. BIOS now executes out of RAM. |
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