2 Troubleshooting Procedures
2-20 [CONFIDENTIAL] TECRA S3 Maintenance Manual (960-532)
Table 2-4 Printer port LED boot mode status (1/9)
LED Status Test item Contents
Permissio n of A20 a nd cle ar of soft war e
reset bit
Prohibition of APIC
Initialization of MCH, ICH
Initialization of Super I/O
Initializ ation of debug port (For models
supporting de bug p ort )
Dummy read of 3rd Bus data
Setting of printer por t (For mod els
supporting print er port)
B0h PIT CH0 initialization (for HOLD_ON)
BIOS rewrite factor flag initialization
CHECK SUM CHECK Transiti on to pr otected mode
Boot block checksum (s kipped when
returned from S3)
Halts when err or occur s
Checksum other than boot block (skipped
when returned from S3)
B1h EC/KBC rewrite check If “rewrite” is requested, go to “BIOS rewrite
process”.
B2h Initialization of SC HLT at L ED=B3H or B4, when error occurs
Key input (skipped when returned from
S3) When a k ey is pressed, check if it is Ti lde
key or Tab key. (skipped when returned from
S3)
B5h Enables CPU cache
B6h Security check
BIOS rewri te request check If Checksum check error occurred on except
Boot Block or rewrite is required by user, go
to “BIOS rewrite proc ess”.
B7h Transits to System BIOS IRT
BIOS rewrite process
Initialization of ICH. D31
DRAM configuration
Permission of cach e ( L1 cache only)
Memory clear
Transition to real mode and copy of BIOS
to RAM