2 Troubleshooting Procedures 2.4 System Board Troubleshooting Table 2-4 Debug port (Boot mode) error status (3/8) D port status Inspection items Details
Checking DRAM type and size
(at cold boot)
When unsupported memory connected, beeps
and halts.
(When DRAM size = o, it halts.)
F101h
Testing the stack area of SM-
RAM (When it can not be used, halts.)
Configuring cache memory
Permission of L1/L2 cache
memory
Checking the access of a
CMOS (Only in Cold Boot) (When error detected, it halts.)
Examining the battery level of
CMOS
Checksum check of CMOS
Initializing data in CMOS (1)
Setting up IRT status (Setting of boot status and IRT busy flag, The
rest bit is 0)
F102h
Storing the size of DRAM
When a CMOS error is detected, no resume
occurs.
If “resume status code” is not set, no resume
occurs.
Branch of resuming
(only in Cold Boot)
Resume error check
S3 recovery error (ICH)
Resume error F17AH
SM-RAM checksum check
Resume error F173H
Memory configuration change check
Resume error F173H
Checksum check of system BIOS RAM area
Resume error F179H
Checksum check of expansion memory
Resume error F176H
Checksum check of PnP RAM
Resume error F177H
To resume process (RESUME_MAIN)
Returns the CPU clock to “Low”
Prohibition of all SMI
Clears resume status
F103h
Resume error process
Return to ROM
QOSMIO G20 Maintenance Manual (960-511) [CONFIDENTIAL] 2-23