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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 M3420
Страница 1: ...Acer Aspire M3420 Service Guide SG V1 00 PRINTED IN TAIWAN ...
Страница 13: ...Chapter 1 5 Block Diagram ...
Страница 47: ...Chapter 3 39 b Slide the HDD out of the cage 6 Repeat steps a and b to remove the other hard disk drivce ...
Страница 53: ...Chapter 3 45 3 Disconnect USB3 0 power cable 4 Lift the power supply module out of the chassis ...
Страница 59: ...Chapter 3 51 3 Lift the board from the chassis 4 Punching in IO Shield then you can remove it ...
Страница 63: ...Chapter 3 55 5 Pull the power switch and LED cable from chassis hole ...
Страница 75: ...Chapter 3 67 Reinstalling the I O Shielding 1 Install I O shielding into chassis ...
Страница 94: ...86 Chapter 3 3 Connect tache of heat sink to the retention frame 4 Secure the hook of heat sink as shown below ...
Страница 96: ...88 Chapter 3 3 Make sure the front bezel retention tabs are securedly fastened to the chassis interior ...
Страница 105: ...97 Chapter 4 b Select Proceed with flash update and Press Enter ...
Страница 107: ...Chapter 5 99 M B Placement Jumper and Connector Information Chapter 5 ...
Страница 119: ...111 Chapter 6 Aspire M3420 Exploded Diagram NOTE This section will be updated when more information becomes available ...