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2.12 Sound Troubleshooting 2 Troubleshooting Procedures
Table 2-3 Printer port LED boot mode status (1/8)
LED Status Test item Message
Register initialization for boot block
Clearing software reset bit
Permitting A20 line
FFh Start
Initialization of special register and Intel chip set
PIT CH0 initialization (for HOLD ON)
BIOS rewrite flag initialization
Checksum check
Transition to protected mode
B0h Flash ROM check
Boot block checksum check (The system halts
when a checksum error is detected.)
Transition to BIOS rewriting when rewrite is
requested
Executing KBC initialization sequence
Enabling keyboard
B1h EC/KBC rewrite check
[Tilde], [TAB] key check
BIOS rewrite request check when check sum error
except for Boot Block is detected, or rewrite is
requested by user
B2h BIOS rewrite check
Transition to BIOS rewrite
System BIOS rewrite
transition to IRT
System BIOS rewrite transition to IRT
Hardware initialization
Setting base for Power Management I/O Space
Enabling BIOS write
Special interrupt control
Disabling BIOS write protect
Enabling SMBus I/O space
Enable SMBus access
Opening work I/O for SDRAM initialization
Setting FDC prohibition
Hardware initialization for each model
PIT CH1 initialization (setting refresh interval to 30
m/s)
B3h
BIOS rewrite process
Initialization of PIT, DMAC, PIC
Satellite A20 Maintenance Manual (960-444) 2-23