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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| Setting of printer port |
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|
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F000H | BTBK_START |
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|
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| 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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| 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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|
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F001H | BTBK_CALC_CHKSUM_END |
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|
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| EC/KBC rewrite check | If “rewrite” is requested, go to “BIOS rewrite |
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| process” |
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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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|
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F002H | BTBK_INI_SC_START |
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|
|
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| Initialization of SC |
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F003H | BTBK_INI_SC_ERR |
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F004H | BTBK_SC_HW_FAILURE |
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|
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F005H | BTBK_INI_KBC_END |
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|
|
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| BIOS rewrite request check | If Checksum check error occurred on except |
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| Boot Block or rewrite is required by user, go to |
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| “BIOS rewrite process”. |
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|
|
F006H | BTBK_ENTER_CHK_BIOS_SIGN |
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|
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| BIOS signature check |
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F007H | BTBK_ENTER_SYSTEM_BIOS |
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|
|
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| Transits to System BIOS IRT |
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|
|
|
| BIOS rewrite process | Initialization of ICHM. D31 |
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|
|
PORTÉGÉ M500 Maintenance Manual | [CONFIDENTIAL] |
