2 Troubleshooting Procedures
PORTEGE R300 Maintenance Manual (960-591) [CONFIDENTIAL] 2-25
Table 2-4-1 Debug port (Boot mode) error status (1/9)
D port status Inspection items Details
Permission of A20 and Clear of
software reset bit
Prohibition of APIC
Initialization of MCH and ICH
Initialization of Super I/O
Initialization of debug port
Dummy read of 3rd Bus data
Boot block
Setting of printer port
BTBK_START
Only PIT CH0 initialization
(for HOLD_ON)
BIOS rewrite factor flag initialization
Transition to protected mode
Boot block checksum (skip when returned to S3)
(halts when error)
F000H
CHECK SUM CHECK
Checksum other than boot block (skip when
returned to S3)
BTBK_CALC_CHKSUM_END
EC/KBC rewrite check
If “rewrite” is requested, go to “BIOS rewrite process”
Key input
F001H
When a key is pressed, check if it is
Tilde key or Tab key
BTBK_INI_SC_START F002H
Initialization of SC
F003H
BTBK_INI_SC_ERR
F004H
BTBK_SC_HW_FAILURE
F005H
Enables CPU cache
BTBk_INT_TPM
F006
BIOS rewrite request check If Checksum check error occurred on except
Boot Block or rewrite is required by user, go to
“BIOS rewrite process”.
BTBK_ENTER_CHK_BIOS_SIGN F007
BIOS signature check
BTBK_ENTER_SYSTEM_BIOS
Transits to System BIOS IRT
F008H
BIOS rewrite process Initialization of ICHM. D31
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