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Chapter 4
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:
Checkpoints may differ between different platforms based on system configuration. Checkpoints
maychange due to vendor requirements, system chipset or option ROMs from add-in PCI devices.
Checkpoint
Description
E0
Initialize the floppy controller in the super I/O. Some interrupt 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.
EA
Enable ATAPI hardware. Attempt to read from ARMD and 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.
F2
Start reading FAT table and analyze FAT to find the clusters occupied by the recovery file.
F3
Start reading the recovery file cluster by cluster.
F5
Disable L1 cache.
FA
Check the validity of the recovery file configuration to the current configuration of the flash
part.
FB
Make flash write enabled through chipset and OEM specific 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.
FC
Erase the flash part
FD
Program the flash part.
FF
The flash has been updated successfully. Make flash write disabled. Disable ATAPI
hardware. Restore CPUID value back into register. Give control to F000 ROM at
F000:FFF0h.
Содержание Aspire M3985
Страница 1: ...Acer Aspire M3985 Service Guide PRINTED IN TAIWAN ...
Страница 13: ...Chapter 1 5 Block Diagram ...
Страница 41: ...Chapter 3 33 Removing the VGA Card 1 Remove the screw that secures the card to the chassis 2 Open PCI Latch ...
Страница 46: ...38 Chapter 3 4 Pull the Pull the optical drive out of the chassis ...
Страница 50: ...42 Chapter 3 7 Lift the power supply module out of the chassis ...
Страница 53: ...Chapter 3 45 3 Lift the board from the chassis 4 Punching in IO Shield then you can remove it ...
Страница 68: ...60 Chapter 3 Reinstalling the Power Supply 1 Install the power supply to chassis 2 Fix the four screws ...
Страница 69: ...Chapter 3 61 Reinstalling the I O Shielding 1 Install I O shielding into chassis ...
Страница 77: ...Chapter 3 69 3 Close the PCI Latch fix the three screws ...
Страница 80: ...72 Chapter 3 3 Connect the cooler cable to the main board connector ...
Страница 82: ...74 Chapter 3 3 Make sure the front bezel retention tabs are securedly fastened to the chassis interior ...
Страница 83: ...Chapter 3 75 Reinstalling the Side Panel 1 Install the side Panel then fix two screws ...
Страница 91: ...83 Chapter 4 b Select Proceed with flash update and Press Enter ...