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ASRock H55 Extreme3 Motherboard
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2.8 Dr. Debug
2.8 Dr. Debug
2.8 Dr. Debug
2.8 Dr. Debug
2.8 Dr. Debug
Dr. Debug is used to provide code information, which makes troubleshooting even
easier. Please see the diagrams below for reading the Dr. Debug codes.
The Bootblock initialization code sets up the chipset, memory and other
components before system memory is available. The following table describes the
type of checkpoints that may occur during the bootblock initialization portion of the
BIOS:
Checkpoint
Description
Before D1
Early chipset initialization is done. Early super I/O initialization is done
including RTC and keyboard controller. NMI is disabled.
D1
Perform keyboard controller BAT test. Check if waking up from power
management suspend state. Save power-on CPUID value in scratch
CMOS.
D0
Go to flat mode with 4GB limit and GA20 enabled. Verify the bootblock
checksum.
D2
Disable CACHE before memory detection. Execute full memory sizing
module. Verify that flat mode is enabled.
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.
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).
Содержание SH55 EXTREME3 -
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