Acer Altos G520 - Manual (Page 181)

171
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
Description G=Green, R=Red, A=Amber
MSB LSB
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.
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