Toshiba Tecra A8 Maintenance Manual - Page 73

2.4 System Board Troubleshooting 2 Troubleshooting Procedures [Intel chipset model] Table 2-4-1 Debug port (Boot mode) error status (1/9) D port status Inspection items Details Boot block Permission of A20 line and clear of software reset bit Prohibition of APIC Initialization of MCH and ICH Initialization of Super I/O Initialization of debug port Dummy read of 3rd Bus data Initialization of only PIT CH0 F000 F001 F002 F005 Setting of printer port (only for models supporting printer port) (only for models supporting Super IO) (only for models supporting Super IO or not) EC/KBC rewrite check Initialization of SC Key input (skip when returned to S3) Enables CPU cache Only PIT CH0 initialization (for HOLD_ON) CHECK SUM CHECK Transition to protect mode Boot block checksum (skip when returned to S3) (halts when error) Checksum other than boot block (skip when returned to S3) If "rewrite" is requested, go to "BIOS rewrite process" When a key pressed ,check the key (skip when returned to S3) F006 Security check BIOS rewrite request check F007 Transits to System BIOS IRT If Checksum check error occurred on except Boot Block or rewrite is required by user, go to "BIOS rewrite process". BIOS rewrite process Initialization of ICHM. D31 Configuration of DRAM Permission of cache (L1 cache only) F008 Transition to real mode and copy of BIOS to RAM Memory clear TECRA A8 /Satellite Pro A120 Maintenance Manual (960-573) [CONFIDENTIAL] 2-25