70 | Setup Init | Display setup message and enable setup |
|
| functions Detect if mouse is present, |
|
| initialize mouse, install interrupt |
|
| vectors. Special treatment to PS2 |
|
| Mouse port |
|
| ACPI |
71 | Setup Cache | Initialize cache controller. |
| Controller |
|
72 | Install FDD | Enter setup check and auto- |
|
| configuration check up |
|
| Initialize floppy disk drive |
|
| controller and any drives. |
|
| Install FDD and setup BIOS data area |
|
| parameters |
73 | Install HDD | Initialize hard drive controller and |
|
| any drives. |
IDE device detection and install Initialize any serial and parallel ports (also game port).
74Detect & Initialize Initialize math coprocessor. Math Coprocessor
75HDD Check for Write HDD check out protection
76Reserved
77Display POST error Check POST error and display them and ask for user intervention Ask password security (optional).
78CMOS and Option ROM Write all CMOS values back to RAM and
| Init | clear screen. |
|
| Enable parity checker |
|
| Enable NMI, Enable cache before boot. |
|
| Initialize any option ROMs present |
|
| from C8000h to EFFFFh. |
|
| NOTE: When FSCAN option is enabled, |
|
| ROMs initialize from C8000h to |
|
| F7FFFh. |
79 | Reserved |
|
7A | Reserved |
|
7B | Reserved |
|
7C | Reserved |
|
7D | Boot Medium | Read and store boot partition head and |
| detection | cylinders values in RAM |
|
|
|
7E | Final Init | Final init for last micro details |
|
| before boot |
|
|
|
7F | Special KBC patch | Set system speed for boot |
|
| Setup NumLock status according to Setup |
|
|
|
80 | Boot Attempt | Set low stack Boot via INT 19h. |
FF | Boot |
|
|
|
|
S4 POST Codes
| Code(hex) | Name | Description |
| |
| 5A | Early Chipset Init | Early Initialized the super IO |
|
|
|
|
|
|
|
|
|
|
| 56 |
|
|
