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2.4 System Board Troubleshooting 2 Troubleshooting Procedures
Table 2-3 D port status (1/9)
D port
status
Inspection items Details
Enabling address line A20 and Clearing a
software reset bit
Prohibition of APIC
Initializing MCHM
Initializing ICHM
Initializing Super I/O
Initializing debug port
Dummy read of 3
rd
Bus data
Setting of printer port (Only for the model supporting PRT)
F000H BTBK_START
Initializing the CH0 of a PIT (For HOLD_ON)
Initializing flags determining whether BIOS
is rewritten
CHECK SUM CHECK Switching to protected mode
Examining the checksum of Boot Block
(Skip when returned to S3)
HLT when check sum error
Examining the checksum other than Boot
Block
F001H BTBK_CALC_CHKSUM_END
EC/KBC rewrite check BIOS rewrite when “rewrite” is requested
Transition of the process to System BIOS IRT
when returned to S3
Key input
When inputting key, [
],
[
],
[TAB] key check
F002H BTBK_INI_SC_START
Initializing security controller
F003H BTBK_INI_SC_ERR
F004H BTBK_SC_HW_FAILURE
F005H BTBK_INI_KBC_END
Checking whether BIOS rewrite is
requested
CheckSum error except Boot Block
when rewrite is requested by user
Transition to BIOS rewrite
F006H BTBK_ENTER_CHK_BIOS_SIGN
BIOS signature check
Satellite A50S/TECRA A3X Maintenance Manual (960-534) [CONFIDENTIAL] 2-19