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| Checkpoint | Description |
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| 11h | Reserved |
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| 12h | Use walking 1’s algorithm to check out interface in CMOS |
|
|
| circuitry. Also set |
|
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| check for override. |
|
| 13h | Reserved |
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| 14h | Program chipset default values into chipset. Chipset |
|
|
| default values are MODBINable by OEM customers. |
|
| 15h | Reserved |
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| 16h | Initial onboard clock generator if |
|
|
| Early_Init_Onboard_Generator is defined. See also POST |
|
|
| 26h. |
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| 17h | Reserved |
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| 18h | Detect CPU information including brand, SMI type (Cyrix or |
|
|
| Intel) and CPU level (586 or 686). |
|
| 19h | Reserved |
|
| 1Ah | Reserved |
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| 1Bh | Initial interrupts vector table. If no special specified, all H/ |
|
|
| W interrupts are directed to SPURIOUS_INT_HDLR & S/ |
|
|
| W interrupts to SPURIOUS_soft_HDLR. |
|
| 1Ch | Reserved |
|
| 1Dh | Initial EARLY_PM_INIT switch |
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| 1Eh | Reserved |
|
| 1Fh | Load keyboard matrix (notebook platform) |
|
| 20h | Reserved |
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| 21h | HPM Initialization (notebook platform) |
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| 22h | Reserved |
|
| 23h | 1. Check validity of RTC value: |
|
|
| e.g. a value of 5Ah is an invalid value for RTC minute. |
|
|
| 2. Load CMOS settings into BIOS stack. If Smos check- |
|
|
| sum fails, use default value instead. |
|
| 24h | Prepare BIOS resource map for PCI & PnP use. If ESCD |
|
|
| is valid, take into consideration of the ESCD’s legacy infor- |
|
|
| mation. |
|
| 25h | Early PCI Initialization: |
|
|
| • Enumerate PCI bus number |
|
|
| • Assign memory & I/O resource |
|
|
| • Search for a valid VGA device & VGA BIOS, and put it |
|
|
| into C000:0 |
|
| 26h | 1. If Early_Init_Onboard_Generator is not defined |
|
|
| Onboard clock generator initialization. Disable respec- |
|
|
| tive clock resource to empty PCI & DIMM slots. |
|
|
| 2. Init onboard PWM |
|
|
| 3. Init onboard H/W monitor devices |
|
| 27h | Initialize INT 09 buffer |
|
| 28h | Reserved |
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|
64 | Chapter 4 |