2.4 System Board Troubleshooting | 2 Troubleshooting Procedures |
Table
D port status | Inspection items | Details |
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Boot block | Permission of A20 and Clear of |
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| software reset bit |
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| Prohibition of APIC |
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| Initialization of MCH and ICH |
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|
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| Initialization of Super I/O |
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|
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| Initialization of debug port |
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|
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| Dummy read of 3rd Bus data |
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|
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|
F000H | Only PIT CH0 initialization |
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| (for HOLD_ON) |
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| BIOS rewrite factor flag initialization |
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|
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| CHECK SUM CHECK | Transition to protected mode |
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|
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| Boot block checksum (skip when returned to S3) |
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| (halts when error) |
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|
|
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| Checksum other than boot block (skip when |
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| returned to S3) |
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|
|
F001H | EC/KBC rewrite check | If “rewrite” is requested, go to “BIOS rewrite process” |
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| |
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|
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| Transition to system BIOS IRT（when |
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| returned to S3) |
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|
|
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| Key input |
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|
|
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| When a key is pressed, check if it is |
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| Tilde key or Tab key |
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F002H | Initialization of SC |
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|
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|
F005H |
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|
|
|
|
F006H |
| If Checksum check error occurred on except |
| BIOS rewrite request check | Boot Block or rewrite is required by user, go to |
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| “BIOS rewrite process”. |
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|
|
F007H | BIOS signature check |
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|
|
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F008H | Transits to System BIOS IRT |
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|
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| BIOS rewrite process | Initialization of ICHM. D31 |
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| DRAM configuration |
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|
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| Permission of cache (L1 cache only) |
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|
|
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| Memory clear |
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|
|
F009H |
| Transition to real mode and copy of BIOS to |
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| RAM |
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|
PORTEGE R500 Maintenance Manual |
