Toshiba QOSMIO F20 User Manual

2 Troubleshooting Procedures 2.4 System Board Troubleshooting
2-20 [CONFIDENTIAL] QOSMIO F20 Maintenance Manual (960-526)
Table 2-4 Debug port (Boot mode) error status (1/9)
D port status Inspection items Details
Permission of A20 and Clear of
software reset bit
Prohibition of APIC
Initialization of MCHM, ICHM
Initialization of Super I/O
Initialization of debug port
Dummy read of 3
rd
Bus data
PIT CH0 initialization
(for HOLD_ON)
BIOS rewrite factor flag
initialization
Transition to protected mode
Boot block checksum (skipped when
returned to S3)
Halts when error occurs
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”.
Transition of process to System
BIOS IRT when returned to S3
Key input
When a key is pressed, check if it is Tilde
key or Tab key.
F002h BIOS rewrite request check
If Checksum check error occurred on
except Boot Block or rewrite is required by
user, go to “BIOS rewrite process”.
F003h
Transits to System BIOS IRT.
Initialization of ICHM. D31
DRAM configuration
Permission of cache (L1 cache only)
Memory clear
BIOS rewrite process
Transition to real mode and copy of BIOS
to RAM

Toshiba QOSMIO F20 Specifications

General

Brand	Toshiba
Model	QOSMIO F20
Category	Laptop
Language	English