Acer Altos G310 manual Bootblock Recovery Codes, Pmm

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Checkpoint Code	Description
D7	Restore CPUID value back into register. The Boot-
	block-Runtime interface module is moved to system
	memory and control is given to it. Determine
	whether to execute serial flash.
D8	The Runtime module is uncompressed into memory.
	CPUID information is stored in memory.
D9	Store the Uncompressed pointer for future use in
	PMM.
	Copying Main BIOS into memory. Leaves all RAM
	below 1MB Read-Write including E000 and F000
	shadow areas but closing SMRAM.
DA	Restore CPUID value back into register. Give control
	to BIOS POST (ExecutePOSTKernel).

Bootblock Recovery Codes

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.

Checkpoint Code	Description
E0	Initialize the floppy controller in the super I/O. Some
	interrupt vectors are initialized. DMA controller is ini-
	tialized 8259 interrupt controller is initialized. L1
	cache is enabled.
E9	Set up floppy controller and data. Attempt to read
	from floppy.
EA	Enable ATAPI hardware. Attempt to read from ARMD
	and ATAPI CDROM.
EB	Disable ATAPI hardware. Jump back to checkpoint E9.