27
Checkpoint Code | Description |
|
|
D7 | Restore CPUID value back into register. The Boot- |
| |
| memory and control is given to it. Determine |
| whether to execute serial flash. |
|
|
D8 | The Runtime module is uncompressed into memory. |
| CPUID information is stored in memory. |
|
|
D9 | Store the Uncompressed pointer for future use in |
| PMM. |
| Copying Main BIOS into memory. Leaves all RAM |
| below 1MB |
| shadow areas but closing SMRAM. |
|
|
DA | Restore CPUID value back into register. Give control |
| to BIOS POST (ExecutePOSTKernel). |
|
|
Bootblock Recovery Codes
The Bootblock recovery code gets control when the BIOS determines that a BIOS recovery needs to occur because the user has forced the update or the BIOS checksum is corrupt. The following table describes the type of checkpoints that may occur during the Bootblock recovery portion of the BIOS.
Checkpoint Code | Description |
|
|
E0 | Initialize the floppy controller in the super I/O. Some |
| interrupt vectors are initialized. DMA controller is ini- |
| tialized 8259 interrupt controller is initialized. L1 |
| cache is enabled. |
|
|
E9 | Set up floppy controller and data. Attempt to read |
| from floppy. |
|
|
EA | Enable ATAPI hardware. Attempt to read from ARMD |
| and ATAPI CDROM. |
|
|
EB | Disable ATAPI hardware. Jump back to checkpoint E9. |
|
|