|
|
|
|
| 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 Keyboard & Mouse |
|
| 51h | Reserved |
|
| 52h | Test all memory (clear all extended memory to 0) |
|
| 53h | Clear password according to H/W jumper (Optional) |
|
| 54h | Reserved |
|
| 55h | Display number of processors |
|
| 56h | Reserved |
|
| 57h | 1. Display PnP logo |
|
|
| 2. Early ISA PnP initialization - Assign CSN to every ISA |
|
|
| PnP device |
|
| 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 |
|
|
| 2. Initialize Init_Onboard_AUDIO |
|
| 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 | Reset keyboard if Early_Reset_KB is not defined. |
|
| 64h | Reserved |
|
| 65h | Initialize PS/2 Mouse |
|
| 66h | Reserved |
|
| 67h | Prepare memory size information for function call: |
|
|
| INT 15h ax=E820h |
|
| 68h | Reserved |
|
| 69h | Turn on L2 cache |
|
| 6Ah | Reserved |
|
|
|
|
|
66 | Chapter 4 |
