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SE7221BK1-E Technical Product Specification
D3
If memory sizing module not executed, start memory refresh and do memory sizing in
Bootblock code. Do additional chipset initialization. Re-enable CACHE. Verify that flat
mode is enabled.
D4
Test base 512KB memory. Adjust policies and cache first 8MB. Set stack.
D5
Bootblock code is copied from ROM to lower system memory and control is given to it.
BIOS now executes out of RAM.
D6
Both key sequence and OEM specific method is checked to determine if BIOS recovery
is forced. Main BIOS checksum is tested. If BIOS recovery is necessary, control flows
to checkpoint E0. See Bootblock Recovery Code Checkpoints section of document for
more information.
D7
Restore CPUID value back into register. The Bootblock-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.
9.7.3.3 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 Bootblock recovery
portion of the BIOS:
Checkpoint
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.
E9 or EA
Determine information about root directory of recovery media.
F0
Search for pre-defined recovery file name in root directory.
F1
Recovery file not found.
Table 74. Bootblock Recovery Code Checkpoints
Description
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