2.4 System Board Troubleshooting 2 Troubleshooting Procedures 2-24 PORTEGE M300 Maintenance Manual (960-504)
Table 2-4 Debug port error status (3/7)D port status Inspection items Details
F102h Cache configuration
Permission of cache (Only for L1 cache)
CMOS access test
(Only when Cold booting) Program halt when error
COMS battery level check
CMOS Check sum check
CMOS data initialization (1)
IRT status setting Setting “Boot status” and “IRT busy
flag” and “0” to the remaining bits.
Storing of DRAM size
F103h Resume branch check (Only when cold booting)
In the case of CMOS error, no resume
occurs.
If “resume status code” is not set, no
resume occurs.
Resume error check
ICH4-M Power Failure Error (Resume error 7AH)
SM-RAM checksum error (Resume error 73H)
Memory configuration change check (Resume error 73H)
Checksum of system BIOS RAM area (Resume error 79H)
Go go resume process (RESUME_MAIN)
Resume error process
Prohibition of all SMI
Clears resume status
Return to ROM.
Forwards the area of C0000h to EFFFFh
to PCI (Prohibition of DRAM)
Set resume error request
Copying ROM/RAM of system BIOS (Program halt when error)
Resume error process Return CPU clock in low
Prohibition of all SMI
Resume status Clear
Return to ROM
Forwards the area of C0000h to
EFFFFh to PCI