
D6
Both key sequence and OEM specific method is checked to determine if BIOS recovery is
forced. If BIOS recovery is necessary, control flows to checkpoint E0. See
Boot block
Recovery Code Checkpoints
section of document for more information.
D7
Restore CPUID value back into register. The Boot block-Runtime interface module is
moved to system 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 Read-Write including E000 and F000 shadow areas
but closing SMRAM.
DA
Restore CPUID value back into register. Give control to BIOS POST
(ExecutePOSTKernel). See
POST Code Checkpoints
section of document for more
information.
DC
System is waking from ACPI S3 state
E1-E8
EC-EE
OEM memory detection/configuration error. This range is reserved for chipset vendors &
system manufacturers. The error associated with this value may be different from one
platform to the next.
Table B-2 Boot block Recovery Code Checkpoints
The Boot block 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 Boot block recovery portion of the BIOS:
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.
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