Toshiba S4 manual Exioromcheck

2.4 System Board Troubleshooting 2 Troubleshooting Procedures

Table 2-4 Printer port LED boot mode status (8/9)

LED Status	Test item	Contents
(1Eh)	(In the case of “Boot”)	Check of key input during IRT (waiting for KBC
		initialization completion)
		Input of password (waiting for HDD initialization
		completion)
		I/O LOCK Processing (For models supporting I/O LOCK)
		TPM Initialization (model supporting TPM)
1Fh	EX_IO_ROM_CHECK	(Check of option I/O ROM)
20h	PRE_BOOT_SETUP	Saving of value in 40:00h (For SIO saving/restoring)
		Setting of font address for resume password
		Setting of repeat parameter for USB KB
		Acquisition of keys pressed during IRT
		Storing of T_SHADOW_RAM_SIZE
		Update of system resource before boot
		Rewriting of memory map data of INT15h E820h
		function
		Waiting for AC-Link initialization completion (For models
		supporting AC-Link)
		Updating of table for DMI
		Copy of ACPI table to top of expansion memory
		Waiting for writing of PSC version to BIOS completion
		Waiting for clock generator setting completion
		When error occurred, halts at LED=21H
		Waiting for serial port initialization completion (For
		models supporting SIO)
		Cancel of NMI Mask
		Taking out TIT check sum
		Clear of the IRT flag on Runtime side
		Update of check sum on Runtime side
		Hibernation branch (For models supporting BIOS
		Hibernation)
		Initialization of Bluetooth (For models supporting
		Bluetooth)
		Check of existence of object maintenance cards
		Prohibition of unused PC cards
		Setting Wakeup status data for ACPI

TECRA S3 Maintenance Manual (960-532) [CONFIDENTIAL] 2-27