Checkpoint | Description |
A2 | Takes 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. |
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|
A4 | Initialize runtime language module. Display boot option popup menu. |
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A7 | Displays the system configuration screen if enabled. Initialize the CPU’s before |
| boot, which includes the programming of the MTRR’s. |
|
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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 for Int 19 boot. Init MP tables. |
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AC | End of POST initialization of chipset registers. |
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|
B1 | Save system context for ACPI. Prepare CPU for OS boot including final |
| MTRR values. |
|
|
00 | Passes control to OS Loader (typically INT19h). |
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