Bootblock Recovery Code Checkpoints

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.

NOTE: Checkpoints may differ between different platforms based on system configuration. Checkpoints may change due to vendor requirements, system chipset or option ROMs from add-in PCI devices.

Checkpoint

 

 

Description

 

 

 

 

E0

 

Initialize the floppy controller in the super I/O. Some interrupt vectors are initialized.

 

 

 

 

DMA controller is initialized. 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.

EF

 

Read error occurred on media. Jump back to checkpoint EB.

F0

 

Search for pre-defined recovery file name in root directory.

F1

 

Recovery file not found.

 

F2

 

Start reading FAT table and analyze FAT to find the clusters occupied by the recovery

 

 

file.

 

F3

 

Start reading the recovery file cluster by cluster.

F5

 

Disable L1 cache.

 

FA

 

Check the validity of the recovery file configuration to the current configuration of the

 

 

flash part.

 

FB

 

Make flash write enabled through chipset and OEM specific method. Detect proper

 

 

flash part. Verify that the found flash part size equals the recovery file size.

F4

 

The recovery file size does not equal the found flash part size.

FC

 

Erase the flash part

 

FD

 

Program the flash part.

 

FF

 

The flash has been updated successfully. Make flash write disabled. Disable ATAPI

 

 

 

 

hardware. Restore CPUID value back into register. Give control to F000 ROM at

 

 

F000:FFF0h.

 

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Gateway 5860 manual Bootblock Recovery Code Checkpoints

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