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2.4 System board Troubleshooting 2 Troubleshooting
TECRA M4 Maintenance Manual (960-521) [CONFIDENTIAL] 2-25
Table 2-3 Debug port (Boot mode) error status (4/10)
D port status Inspection items Details
(F103h)
Resume error check
S3 recovery error (ICH) Resume error 7AH
SM-RAM checksum check Resume error 73H
Memory configuration change check
Resume error 73H
Checksum check of system BIOS RAM area
Resume error 79H
Checksum check of expansion memory
Resume error 76H
Checksum check of PnP RAM
Resume error 77H
To resume process (RESUME_MAIN)
Returns the CPU clock to “Low”
Prohibition of all SMIs
Clears resume status
To resume error process
Returns to ROM
Forwards the area of C0000h to EFFFFh to PCI
(prohibition of DRAM)
Sets resume error request
Copying ROM/RAM of
system BIOS
Halts, when error occurred
F105h SMRAM initialization
Check if CPU corresponds
to Hyper Threading
Initialization of APIC
WakeUp factor check
SMRAM base rewriting
and CPU state map
saving for BIOS
Permission of SMI based
on ASMI