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2.4 System Board Troubleshooting
2 Troubleshooting Procedures
Satellite A50/TECRA A2 Maintenance Manual (960-478)
2-21
Table 2-3 D port status (1/9)
D port
status
Inspection items
Details
Enabling address line A20 and Clearing a software reset bit
Prohibition of APIC
Initializing MCHM
Initializing ICHM
Initializing Super I/O
Initializing debug port
Dummy read of 3
rd
Bus data
Setting of printer port (Only for the model supporting PRT)
F000h
Start
Initializing the CH0 of a PIT (For HOLD_ON)
Initializing flags determining whether BIOS is rewritten
CHECK SUM CHECK
Switching to protected mode
Examining the checksum of Boot Block
(Skip when returned to S3)
Examining the checksum of other data in a flash memory
(Skip when returned to S3)
F001h
Initializing a KBC (1)
EC/KBC rewrite check
BIOS rewrite when “rewrite” is requested
Transition of the process to System BIOS IRT when
returned to S3
Key input
When inputting key, [
], [
],
[TAB] key check
F002h
Checking whether BIOS
rewrite is requested
Checking whether BIOS rewrite is requested
CheckSum error except Boot Block
when rewrite is requested by user
Transition to BIOS rewrite
F003h
BIOS rewrite
Transition to System BIOS IRT
Initializing ICHM.D31
DRAM Configuration
Enabling L1 cache
Clearing memory
Transferring to real mode and copy BIOS to RAM
Summary of Contents for Tecra A2 Series
Page 10: ...x Satellite A50 TECRA A2 Maintenance Manual 960 478 ...
Page 11: ...Chapter 1 Hardware Overview ...
Page 49: ...Chapter 2 Troubleshooting Procedures ...
Page 50: ...2 Troubleshooting Procedures 2 ii Satellite A50 TECRA A2 Maintenance Manual 960 478 2 ...
Page 54: ...2 Troubleshooting Procedures 2 vi Satellite A50 TECRA A2 Maintenance Manual 960 478 ...
Page 105: ...Chapter 3 Tests and Diagnostics ...
Page 106: ...3 Tests and Diagnostics 3 ii Satellite A50 TECRA A2 Maintenance Manual 960 478 3 ...
Page 197: ...Chapter 4 Replacement Procedures ...
Page 198: ...4 Replacement Procedures 4 ii Satellite A50 TECRA A2 Maintenance Manual 960 478 4 ...
Page 204: ...4 Replacement Procedures 4 viii Satellite A50 TECRA A2 Maintenance Manual 960 478 ...
Page 271: ...Appendices ...
Page 272: ...Appendices App ii Satellite A50 TECRA A2 Maintenance Manual 960 478 ...
Page 290: ...Appendices Apx B Board Layout B 6 Satellite A50 TECRA A2 Maintenance Manual 960 478 ...
Page 332: ...Appendices Apx E Key Layout E 2 Satellite A50 TECRA A2 Maintenance Manual 960 478 ...
Page 334: ...Appendices Apx F Wiring Diagrams F 2 Satellite A50 TECRA A2 Maintenance Manual 960 478 ...
Page 336: ...Appendices Apx G BIOS KBC EC Update G 2 Satellite A50 TECRA A2 Maintenance Manual 960 478 ...
Page 338: ...Appendices Apx H Reliability H 2 Satellite A50 TECRA A2 Maintenance Manual 960 478 ...