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2.4 System Board Troubleshooting 2 Troubleshooting Procedures
Table 2-4 Debug port (Boot mode) error status (4/8)
D port status Inspection items Details
Forwards the area of C0000h to EFFFFh to
PCI (prohibition of DRAM)
Sets resume error request
Copying ROM/RAM of system
BIOS
(When error occurred, it halts.)
SMRAM initialization
WakeUp factor check
SMRAM base rewriting and
CPU state map saving for
BIOS
F104h
Permission of SMI based on
ASMI
F105h
Initialization of devices which
need initialization before PCI
bus initialization
PIT test (at Cold boot only) and initialization
Setting of test pattern to channel 0 of PIT#0
Check whether the set test pattern can be
read.
Initialization of PIT channel 0
(Setting of timer interruption interval to 55ms)
Initialization of PIT channel 2
(Setting of the sound generator frequency to
664Hz)
Test of PIT channel 1
(Check whether the refresh signal works normally
in 30 micro-s refresh interval)
(The system halts when the time is out.)
Test of PIT channel 2
(Check if the speaker gate works properly.)
CPU clock measurement
Check of parameter block A
Permission of SMI except auto-off function
Control on excess of rated input power
Battery discharge current control (1CmA)
AC adapter rated over current control
Dividing procedures for time measuring by IRT
Setting for clock generator
CPU Initialization
Update of micro code
Judge of CPU type
Geyserville support check
Setting of CPU clock to “high"
Graphics Aperture Size setting
2-24 [CONFIDENTIAL] QOSMIO G20 Maintenance Manual (960-511)