Toshiba r500 manual PIT test Cold boot only and initialization

2.4 System Board Troubleshooting 2 Troubleshooting Procedures

Table 2-5 Debug port (Boot mode) error status (5/10)

D port status	Inspection items		Details
F106H			PIT test (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) HLT, when the time is out
			Test of PIT channel 2
			(Check whether the speaker gate works normally)
	Initialization of devices	which
			CPU clock measurement
	need initialization before PCI bus
	initialization		Check of parameter block A
			Permission of SMI except auto-off function
			Control of excess of rated input power
			Battery discharging current control (1CmA)
			AC adapter rated over current control
			Dividing procedures for time measuring by IRT
			Setting for clock generator
			CPU Initialization
			Judgment of CPU type
			Check of supporting Geyserville
			Make CPU clock High
			Graphics Aperture Size setup
F107H	Saving memory configuration to
	buffer
	Reading of EC version
	Update of flash ROM type
	Judging of destination (Japan or
	other than Japan) based on DMI
	data
	CMOS default setting check		Sets default setting if bad battery or bad checksum
			(ROM, CMOS) is detected
	ACPI table initialization
	(for execution of option ROM)

PORTEGE R500 Maintenance Manual (960-634) [CONFIDENTIAL] 2-23