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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 provides the diagnostic LED codes for these checkpoints and describes
the type of checkpoints that may occur during the Bootblock recovery portion of the BIOS:
D6 R O G R 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 ROGORestore 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 O R Off R The Runtime module is uncompressed into memory. CPUID
information is stored in memory.
D9 O R Off O Store the Uncompressed pointer for future use in PMM. Copying
Main BIOS into memory. Leaves all RAM below 1 MB
Read-Write, including E000 and F000 shadow areas, but closing
SMRAM.
DA O R G R Restore CPUID value back into register. Give control to BIOS
POST (ExecutePOSTKernel). See “POST code checkpoints” on
page 128 for more information.
E1-E8
EC-EE
----OEM memory detection/configuration error. This range is
reserved for chipset vendors and system manufacturers. The
error associated with this value may be different from one
platform to the next.
Check
point
Diagnostic LED decoder
G=Green, R=Red, O=Orange
Description
E0 RRROffInitialize 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 O R R G Set up floppy controller and data. Attempt to read from floppy.
EA O R O Off Enable ATAPI hardware. Attempt to read from ARMD and ATAPI
CDROM.
EB O R O G Disable ATAPI hardware. Jump back to checkpoint E9.
Check
point
Diagnostic LED decoder
G=Green, R=Red, O=Orange
Description
8510522.book Page 132 Wednesday, March 16, 2005 11:19 AM