Acer RL70 Service Manual
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Contents
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Chapter 4 52Bootblock Recovery Code CheckpointsThe Bootblock recovery code gets control when the BIOS determines that a BIOS recovery needs to occurbecause the user has forced the update or the BIOS checksum is corrupt. The following table describes thetype of checkpoints that may occur during the Bootblock recovery portion of the BIOS.NOTE: Checkpoints may differ between different platforms based on system configuration. Checkpointsmaychange due to vendor requirements, system chipset or option ROMs from add-in PCI devices.Checkpoint DescriptionE0 Initialize the floppy controller in the super I/O. Some interrupt vectors are initialized. DMAcontroller 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 flashpart.FB Make flash write enabled through chipset and OEM specific method. Detect proper flashpart. 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 partFD Program the flash part.FF The flash has been updated successfully. Make flash write disabled. Disable ATAPIhardware. Restore CPUID value back into register. Give control to F000 ROM atF000:FFF0h. |
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