| CHAPTER 6: Troubleshooting |
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Check | Description |
point |
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A2 | Take care of runtime image preparation for different BIOS modules. Fill the free |
| area in F000h segment with 0FFh. Initializes the Microsoft® IRQ Routing Table. |
| Prepares the runtime language module. Disables the system configuration display, |
| if needed. |
A4 | Initialize runtime language module. |
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A7 | Display the system configuration screen, if enabled. Initialize the CPUs before boot, |
| including the programming of the MTRRs. |
A8 | Prepare CPU for operating system boot, including final MTRR values. |
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A9 | Wait for user input at config display, if needed. |
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AA | Uninstall POST INT1Ch vector and INT09h vector. |
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AB | Prepare BBS in Int 19 boot. |
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AC | End of POST initialization of chipset registers. |
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B1 | Save system context for ACPI. |
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00 | Pass control to OS Loader (typically INT19h). |
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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 | Description |
point |
|
|
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Before | Early chipset initialization is done. Early super I/O initialization is done, including |
D1h | RTC and keyboard controller. NMI is disabled. |
D1 | Perform keyboard controller BAT test. Check if waking up from power management |
| suspend state. Save |
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D0 | Go to flat mode with 4 GB limit and GA20 enabled. Verify the bootblock checksum. |
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D2 | Disable CACHE before memory detection. Execute full memory sizing module. Verify |
| that flat mode is enabled. |
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D3 | If memory sizing module not executed, start memory refresh and do memory sizing |
| in Bootblock code. Do additional chipset initialization. |
| flat mode is enabled. |
D4 | Test base 512 KB memory. Adjust policies and cache first 8 MB. Set stack. |
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D5 | Bootblock code is copied from ROM to lower system memory and control is given |
| to it. BIOS now executes out of RAM. |
D6 | Both key sequence and |
| 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. |
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D7 | Restore CPUID value back into register. The |
| moved to system memory and control is given to it. Determine whether to execute |
| serial flash. |
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