Toshiba PORTEGE M300 Maintenance Manual page 72

2 Troubleshooting Procedures
D port status
(F007h)
F008h Transition to RAM BIOS from ROM BIOS
F009h Saving of key scan code
Setting of TASK_1ms_TSC
Display message in navigation panel
Key input
Reading of
CHGBIOSA.EXE/CHGFIRMA.EXE
FDC RESET
Setting of parameters for 2HD (1.44MB),
Setting of transmission rate
Reading of first sector, If it is the data of
1.44MB (2HD), the media type is definite
Setting of parameters for 2DD (720KB),
Setting of transmission rate
Retrieval of "CHGBIOSA.EXE " from the
root directory.
Calculates the directory start header and
sector.
Reading one sector of the root directory.
Retrieval the entry of "CHGBIOSA.EXE "
and "CHGFIRMA.EXE " from the sector
read.
Reading of EXE header of
"CHGBIOSA.EXE " and "CHGFIRMA.EXE "
Execution of "CHGBIOSA.EXE " and
"CHGFIRMA.EXE "
F100h Initialization of PIT channel 1
F101h DRAM type & check size
Checking DRAM size
If DRAM size is "0", the program halt
Stack field test of SM-RAM
PORTEGE M300 Maintenance Manual (960-504)
Table 2-4 Debug port error status (2/7)
Inspection items
2.4 System Board Troubleshooting
Details
Releasing of BIOS write-protection
Enables the I/O space of SMBus
Permission of SMBus accesses
Configuration of DRAM
Permission of cache (only for L1 cache)
MEMEORY CLEAR
(EC/KBC UPDATE,
BIOS UPDATE/DAMEGED)
Key input when error
Setting "30?s" to the refresh interval
Only when cold booting
Program halt when it's not used as stack
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