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| Appendix |
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| checksum fails, use default value instead. |
| 3. | Prepare BIOS resource map for PCI & PnP use. If |
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| ESCD is valid, take into consideration of the ESCD’s |
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| legacy information. |
| 4. | Onboard clock generator initialization. Disable |
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| respective clock resource to empty PCI & DIMM |
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| slots. |
| 5. | Early PCI initialization: |
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| - Enumerate PCI bus number |
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| - Assign memory & I/O resource |
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| - Search for a valid VGA device & VGA BIOS, and |
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| put it into C000:0. |
24h | Reserved | |
25h | Reserved | |
26h | Reserved | |
27h | Initialize INT 09 buffer | |
28h | Reserved | |
29h | 1. | Program CPU internal MTRR (P6 & PII) for |
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| memory address. |
| 2. | Initialize the APIC for Pentium class CPU. |
| 3. | Program early chipset according to CMOS setup. |
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| Example: onboard IDE controller. |
| 4. | Measure CPU speed. |
| 5. | Invoke video BIOS. |
2Ah | Reserved | |
2Bh | Reserved | |
2Ch | Reserved | |
2Dh | 1. | Initialize |
| 2. | Put information on screen display, including Award |
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| title, CPU type, CPU speed …. |
2Eh | Reserved | |
2Fh | Reserved | |
30h | Reserved | |
31h | Reserved | |
32h | Reserved | |
33h | Reset keyboard except Winbond 977 series Super I/O | |
| chips. | |