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Check

Description

point

 

EB

Disable ATAPI hardware. Jump back to checkpoint E9.

 

 

EF

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

 

 

E9 or

Determine information about root directory of recovery media.

EA

 

 

 

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 correct

 

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.

 

 

FFThe 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.

DIM code checkpoints

The Device Initialization Manager (DIM) gets control at various times during BIOS POST to initialize different system buses. The following table describes the main checkpoints where the DIM module is accessed.

Checkpoint

Description

 

 

2A

Initialize different buses and perform the following functions:

 

■

Reset, Detect, and Disable (function 0) — Disables all device

 

 

nodes, PCI devices, and PnP ISA cards. It also assigns PCI

 

 

bus numbers.

 

■

Static Device Initialization (function 1) — Initializes all static

 

 

devices that include manual configured onboard

 

 

peripherals, memory and I/O decode windows in PCI-PCI

 

 

bridges, and noncompliant PCI devices. Static resources

 

 

are also reserved.

 

■

Boot Output Device Initialization (function 2) — Searches

 

 

for and initializes any PnP, PCI, or AGP video devices.

38

Initialize different buses and perform the following functions:

 

■

Boot Input Device INitialization (function 3) — Searches for

 

 

and configures PCI input devices and detects if system has

 

 

standard keyboard controller.

 

■

IPL Device Initialization (function 4) — Searches for and

 

 

configures all PnP and PCI boot devices.

 

■

General Device Initialization (function 5) — Configures all

 

 

onboard peripherals that are set to an automatic

 

 

configuration and configures all remaining PnP and PCI

 

 

devices.

 

 

 

77