Checkpoint | Description |
|
|
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 USB |
|
|
51h | Reserved |
|
|
52h | Test all memory (clear all extended memory to 0) |
|
|
53h | Reserved |
|
|
54h | Reserved |
|
|
55h | Display number of processors |
|
|
56h | Reserved |
|
|
57h | 1. Display PnP logo |
| 2. Early ISA PnP initialization |
|
|
58h | Reserved |
|
|
59h | Initialize the combined Trend |
|
|
5Ah | Reserved |
|
|
5Bh | (Optional Feature) Show message for entering AWDFLASH.EXE from FDD (optional) |
|
|
5Ch | Reserved |
|
|
5Dh | 1. Initialize Init_Onboard_Super_IO switch. |
| 2. Initialize Init_Onboard_AUDIO switch. |
|
|
5Eh | Reserved |
|
|
5Fh | Reserved |
|
|
60h | Okay to enter Setup utility; i.e. not until this POST stage can users enter the CMOS setup |
| utility. |
|
|
61h | Reserved |
|
|
62h | Reserved |
|
|
63h | Reserved |
|
|
64h | Reserved |
|
|
65h | Initialize PS/2 Mouse |
|
|
66h | Reserved |
|
|
67h | Prepare memory size information for function call: INT 15h ax=E820h |
|
|
68h | Reserved |
|
|
37 | Chapter 4 |
