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2.4 System Board Troubleshooting 2 Troubleshooting Procedures
TECRA A8 /Satellite Pro A120 Maintenance Manual (960-573) [CONFIDENTIAL] 2-25
[Intel chipset model]
Table 2-4-1 Debug port (Boot mode) error status (1/9)
D port status Inspection items Details
Permission of A20 line and clear of
software reset bit
Prohibition of APIC
Initialization of MCH and ICH
Initialization of Super I/O
Initialization of debug port
Dummy read of 3rd Bus data
Initialization of only PIT CH0
Boot block
Setting of printer port (only for models
supporting printer port)
(only for models supporting Super IO)
Only PIT CH0 initialization (for HOLD_ON)
CHECK SUM CHECK
Transition to protect mode
F000
(only for models supporting Super IO
or not)
Boot block checksum (skip when returned to S3)
(halts when error)
Checksum other than boot block (skip when
returned to S3)
F001 EC/KBC rewrite check If “rewrite” is requested, go to “BIOS rewrite
process”
Initialization of SC F002
Key input (skip when returned to S3) When a key pressed ,check the key (skip when
returned to S3)
F005
Enables CPU cache
Security check
F006
BIOS rewrite request check If Checksum check error occurred on except
Boot Block or rewrite is required by user, go to
“BIOS rewrite process”.
Transits to System BIOS IRT
Initialization of ICHM. D31
Configuration of DRAM
Permission of cache (L1 cache only)
F007
BIOS rewrite process
Memory clear
F008 Transition to real mode and copy of
BIOS to RAM