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2 Troubleshooting Procedures 2.4 System Board Troubleshooting
2-22 [CONFIDENTIAL] QOSMIO F30 Maintenance Manual (960-555)
Table 2-4 Debug port (Boot mode) error status (1/10)
D port status Inspection items Details
Permission of A20 and Clear of
software reset bit
Prohibition of APIC
Initialization of MCH and ICH
Initialization of Super I/O (For
models supporting Super I/O)
Initialization of debug port (For
models supporting debug port)
Dummy read of 3
rd
Bus data
Boot block
Setting of printer port (For models
supporting printer port)
Only PIT CH0 initialization
(for HOLD_ON)
BIOS rewrite factor flag
initialization
Transition to protected mode
Boot block checksum (skip when returned
to S3) (halts when error)
F000h
CHECK SUM CHECK
Checksum other than boot block (skip
when returned to S3)
F001h
EC/KBC rewrite check
If “rewrite” is requested, go to “BIOS rewrite
process”.
Initialization of SC
HLT at DPORT=F003H or F004H, when
error occurs
F002h
Key input (skipped when returned
from S3)
When a key is pressed, check if it is Tilde
key or Tab key. (skipped when returned
from S3)
F005h
Enables CPU cache
Security check
F006h
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
DRAM configuration
Permission of cache (L1 cache only)
Memory clear
F007
BIOS rewrite process
Transition to real mode and copy of BIOS
to RAM