Toshiba QOSMIO F10 Maintenance Manual page 68

2.4 System Board Troubleshooting
Table 2-4 Debug port (Boot mode) error status (1/9)
D port status
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
Setting of printer port (for models
supporting printer)
PIT CH0 initialization (for
F000h
HOLD_ON)
BIOS rewrite factor flag
initialization
CHECK SUM CHECK
EC/KBC rewrite check
F001h
Transition of process to System
BIOS IRT when returned to S3
Key input
BIOS rewrite request check
F002h
Transits to System BIOS IRT.
F003h
BIOS rewrite process
2-20
Inspection items
rd
Bus data
2 Troubleshooting Procedures
Details
Transition to protected mode
Boot block checksum (skipped when
returned to S3)
Halts when error occurs
Checksum other than boot block (skip
when returned to S3)
If "rewrite" is requested, go to "BIOS rewrite
process".
When a key is pressed, check if it is Tilde
key or Tab key.
If Checksum check error occurred on
except Boot Block or rewrite is required by
user, go to "BIOS rewrite process".
Initialization of ICHM. D31
DRAM configuration
Permission of cache (L1 cache only)
Memory clear
Transition to real mode and copy of BIOS
to RAM
QOSMIO F10 Maintenance Manual (960-498)