POST Code (Hex) | POST Routine Description |
|
|
2Dh | 1 Initialize |
| 2 Put information on screen display, including Award title, CPU type, CPU speed, |
| full screen logo. |
|
|
2Eh | Reserved |
|
|
2Fh | Reserved |
|
|
30h | Reserved |
|
|
31h | Reserved |
|
|
32h | Reserved |
|
|
33h | Reset keyboard if Early_Reset_KB is defined e.g. Winbond 977 series Super I/O |
| chips. See also POST 63h. |
|
|
34h | Reserved |
|
|
35h | Test DMA Channel 0 |
|
|
36h | Reserved |
|
|
37h | Test DMA Channel 1 |
|
|
38h | Reserved |
|
|
39h | Test DMA page registers |
|
|
3Ah | Reserved |
|
|
3Bh | Reserved |
|
|
3Ch | Test 8254 |
|
|
3Dh | Reserved |
|
|
3Eh | Test 8259 interrupt mask bits for channel 1 |
|
|
3Fh | Reserved |
|
|
40h | Test 8259 interrupt mask bits for channel 2 |
|
|
41h | Reserved |
|
|
42h | Reserved |
|
|
43h | Test 8259 functionality |
|
|
44h | Reserved |
|
|
45h | Reserved |
|
|
46h | Reserved |
|
|
47h | Initialize EISA slot |
|
|
48h | Reserved |
|
|
49h | 1 Calculate total memory by testing the last double word of each 64K page. |
| 2 Program write allocation for AMD K5 CPU. |
|
|
4Ah | Reserved |
|
|
4Bh | Reserved |
|
|
4Ch | Reserved |
|
|
4Dh | Reserved |
|
|
4Eh | 1 Program MTRR of M1 CPU |
| 2 Initialize L2 cache for P6 class CPU & program CPU with proper cacheable |
| range |
| 3 Initialize the APIC for P6 class CPU |
| 4 On MP platform, adjust the cacheable range to smaller one in case the |
| cacheable ranges between each CPU are not identical |
|
|
4Fh | Reserved |
|
|
50h | Initialize the USB Keyboard & Mouse |
|
|
Chapter 4 | 63 |
