Toshiba Portege M500, Maintenance Manual

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2 Troubleshooting Procedures 2.4 System Board Troubleshooting
2-24 [CONFIDENTIAL] PORTÉGÉ M500 Maintenance Manual (960-559)
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)
(F007H)
Memory clear
BTBK_INI_MEM_END
F008H
Transition to real mode and copy of
BIOS to RAM
BTBK_CHG_RAM_BIOS
F009H
Saving key scan code
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)
F00AH
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
F00BH
Reading CHGBIOSA.EXE /
CHGFIRMA.EXE
Execution of “CHGBIOSA.EXE” and
“CHGFIRMA.EXE”