Printer port LED boot mode status 1/8 | Toshiba A10 specification

Table 2-3 Printer port LED boot mode status (1/8)

LED Status	Test item	Contents
	Start	Clear of software reset bit
		Prohibition of APIC
		Initialization of MCHM
		Initialization of ICHM
		Initialization of Super I/O
		Initialization of debug port
		Dummy read of 3rd Bus data
B0h	Flash ROM check	PIT CH0 initialization (for HOLD_ON)
		BIOS rewrite factor flag initialization
		CHECK SUM CHECK
		Transition to protected mode
		Boot block checksum (skip when returned to S3)
		The program halts when checksum error occurred.
		Checksum other than boot block (skip when
		returned to S3)
B1h	KBC initialization	EC/KBC rewrite check

		If “rewrite” is requested, go to “BIOS rewrite
		process”.
		Transition of process to System BIOS IRT when
		returned to S3)
		Key input

		Check of Tilde key (	key) and Tab key if a key
		is pressed

B2h	BIOS rewrite request check	BIOS rewrite request check if Checksum check
		error occurred on except Boot Block or rewrite is
		required by user. “BIOS rewrite process”.
B3h	BIOS rewrite (1)	Transits to System BIOS IRT.

		Initialization of ICHM. D31

		DRAM configuration

		Permission of cache (L1 cache only)

		Memory clear

		Transition to real mode and copy of BIOS to RAM

B5h		Saving of key scan code

		Setting of TASK_1ms_TSC

B6h	BIOS rewrite	FAN control

		Sound initialization (for BEEP sound)

		System speaker enable

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