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| Appendix B: BIOS POST Codes |
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POST Code | Description |
D2h | Unknown interrupt |
D4h | Check Intel Branding string |
D8h | Alert Standard Format initialization |
D9h | Late init for IPMI |
DEh | Log error if |
The following are for boot block in Flash ROM | |
POST Code | Description |
E0h | Initialize the chipset |
E1h | Initialize the bridge |
E2h | Initialize the CPU |
E3h | Initialize system timer |
E4h | Initialize system I/O |
E5h | Check force recovery boot |
E6h | Checksum BIOS ROM |
E7h | Go to BIOS |
E8h | Set Huge Segment |
E9h | Initialize Multi Processor |
EAh | Initialize OEM special code |
EBh | Initialize PIC and DMA |
ECh | Initialize Memory type |
EDh | Initialize Memory size |
EEh | Shadow Boot Block |
EFh | System memory test |
F0h | Initialize interrupt vectors |
F1h | Initialize Run Time Clock |
F2h | Initialize video |
F3h | Initialize System Management Manager |
F4h | Output one beep |
F5h | Clear Huge Segment |
F6h | Boot to Mini DOS |
F7h | Boot to Full DOS |
If the BIOS detects error 2C, 2E, or 30 (base 512K RAM error), it displays an additional