Acer G520 series manual Bootblock Recovery Code Checkpoint

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Bootblock Recovery Code Checkpoint

The bootblock recovery code gets control when the BIOS determines that a BIOS recovery needs to occur because the user has forced the update or the BIOS checksum is corrupt. The following table describes the type of checkpoints that may occur during the Bootblock recovery portion of the BIOS:

Check point

Diagnostic LED Decoder

G=Green, R=Red, A=Amber

MSB LSB

Description

E0	R	R	R	OFF	Initialize the floppy
					controller in the super I/O.
					Some interrupt vectors are
					intialized. DMA controller
					is initialized. 8259
					interrupt controller is
					initialized. L1 cache is
					enabled.
E9	A	R	R	OFF	Set up floppy controller
					and data. Attempt to read
					from floppy. Determine
					information about root
					directory of recovery
					media.
EA	A	R	A	OFF	Enable ATAPI hardware.
					Attempt to read from
					ARMD and ATAPI CD-
					ROM. Determine
					information about root
					directory of recovery
					media.
EB	A	R	A	G	Disable ATAPI hardware.
					Jump back to checkpoint
					E9.