Bootblock Recovery Code Checkpoints - ROHS EmETXe-i9652 User Manual

BIOS

3.9.2 Bootblock Recovery Code Checkpoints

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 :
(Note)
Checkpoint
Initialize the floppy controller in the super I/O. Some interrupt
E0 vectors are initialized. DMA controller is initialized. 8259
interrupt controller is initialized. L1 cache is enabled.
E9 Set up floppy controller and data. Attempt to read from floppy.
Enable ATAPI hardware. Attempt to read from ARMD and
EA
ATAPI CDROM.
EB Disable ATAPI hardware. Jump back to checkpoint E9.
EF Read error occurred on media. Jump back to checkpoint EB.
F0 Search for pre-defined recovery file name in root directory.
F1 Recovery file not found.
Start reading FAT table and analyze FAT to find the clusters
F2
occupied by the recovery file.
F3 Start reading the recovery file cluster by cluster.
F5 Disable L1 cache.
Check the validity of the recovery file configuration to the
FA
current configuration of the flash part.
Make flash write enabled through chipset and OEM specific
FB method. Detect proper flash part. Verify that the found flash
part size equals the recovery file size.
F4 The recovery file size does not equal the found flash part size.
Description
- 57 -