Toshiba M400 - Portege - Core 2 Duo 1.83 GHz, Maintenance Manual

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2 Troubleshooting 2.4 System board Troubleshooting
2-22 [CONFIDENTIAL] PORTEGE M400 Maintenance Manual (960-541)
Table 2-3 Debug port (Boot mode) error status (2/10)
D port status Inspection items Details
Saving key scan code
Setting TASK_1ms_TSC
Controlling fan
Enabling system speaker
Releasing mute
Initializing sound items
(for BEEP)
Making the volume max
When BIOS, EC/KBC rewriting
is requested
Blinks green (cycle:2s, on:1s, off:1s)
When BIOS ROM is abnormal Blinks orange (cycle:2s, on:1s, off:1s)
When BIOS renewal is
prohibited Blinks 8 second cycle (On:4s, Off:4s) Beeps
30 second and halts D port=F00Bh
Key input Temporary prohibition of USB
Beeps
Waiting for key input
FDC reset
Setting parameters for 2HD(1.44MB)
Reading of first sector, If it is the data of
1.44MB (2HD), the media type is definite
Setting of parameters for 2DD (720KB)
Retrieval of “CHGBIOSA.EXE” from the root
directory
Calculation of directory start head and
sector
Read one sector of the root directory
Retrieval of entry of “CHGBIOSA.EXE”
/“CHGFIRMA.EXE” from the sector read
Reading of EXE header of “CHGBIOSA.EXE”
and “CHGFIRMA.EXE”
Key input when error occurred
F009h
Reading CHGBIOSA.EXE /
CHGFIRMA.EXE
Execution of “CHGBIOSA.EXE” and
“CHGFIRMA.EXE”
F100h Renewal of micro code
(In model supporting HTT)
Prohibition of cache
Permission of L1/L2 cache in
Flash ROM area