2 Troubleshooting Procedures | 2.4 System Board Troubleshooting |
Table 2-4 Debug port (Boot mode) error status (1/8)
D port status | Inspection items | Details |
|
|
|
| Permission of A20 and Clear of |
|
| software reset bit |
|
| Prohibition of APIC |
|
|
|
|
| Initialization of MCHM |
|
|
|
|
| Initialization of ICHM |
|
|
|
|
| Initialization of Super I/O |
|
|
|
|
| Initialization of debug port |
|
|
|
|
| Dummy read of 3rd Bus data |
|
F000h | PIT CH0 initialization (for |
|
| HOLD_ON) |
|
| BIOS rewrite factor flag |
|
| initialization |
|
| CHECK SUM CHECK | Transition to protected mode |
|
| Boot block checksum (skip when returned |
|
| to S3) (halts when error) |
|
| Checksum other than boot block (skip |
|
| when returned to S3) |
|
|
|
F001h | EC/KBC rewrite check | Key input |
| If “rewrite” is requested, go to | Check of Tilde key, Tab key if a key is |
| “BIOS rewrite process”. | |
| pressed | |
| Transition of process to System | |
|
| |
| BIOS IRT when returned to S3) |
|
F002h | BIOS rewrite request check |
|
| BIOS rewrite request check if |
|
| Checksum check error occurred |
|
| on except Boot Block or rewrite |
|
| is required by user. “BIOS |
|
| rewrite process”. |
|
F003h | Transits to System BIOS IRT |
|
|
|
|
BIOS rewrite |
|
|
|
|
|
| Initialization of ICHM. D31 |
|
|
|
|
| DRAM configuration |
|
|
|
|
| Permission of cache (L1 cache |
|
| only) |
|
| Memory clear |
|
|
|
|
| Transition to real mode and copy |
|
| of BIOS to RAM |
|
QOSMIO G20 Maintenance Manual | [CONFIDENTIAL] |
