Toshiba PORTEGE R300, Maintenance Manual

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2 Troubleshooting Procedures
2-26 [CONFIDENTIAL] PORTEGE R300 Maintenance Manual (960-591)
Table 2-4 Debug port (Boot mode) error status (2/10)
D port status Inspection items Details
DRAM configuration
Permission of cache (L1 cache only)
(F008H)
Memory clear
BTBK_INI_MEM_END
F009H
Transition to real mode and copy of
BIOS to RAM
BTBK_CHG_RAM_BIOS
Saving key scan code
F00AH
A setup of TASK_1 second_TSC
BTBK_INI_VGA_END
Controlling fan
Permission of system speaker
Releasing mute
Initializing sound items
(for BEEP)
Making the volume max (model that can control volume)
F00BH
When request BIOS, EC/KBC
rewriting
Blinks green (cycle:2s, on:1s, off:1s)
BTBK_CANT_UPDATE_BIOS
When BIOS renewal is prohibited Blinks orange (cycle: 2s(On:1s,Off:1s))
Prohibition of USB
BEEP
Key input
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.
Directory start header and calculates the sector
Read 1 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
F00CH
Reading CHGBIOSA.EXE /
CHGFIRMA.EXE
Execution of “CHGBIOSA.EXE” and
“CHGFIRMA.EXE”