MegaPro Dual Pentium Pro PCI ISA Motherboard User’s Guide
78
Bootblock Code Checkpoint Codes
Code
Description
E0h
Verify the Boot Block BIOS checksum. Disable the internal
cache, DMA, and interrupt controllers. Initialize the system
timer. Start memory refresh.
E1h Initialize the chipset registers. Set the BIOS size to 128K.
Make the 512 KB base memory available.
E2h
Test the base 64 KB of system memory. Send the BAT
command to the keyboard controller. Make sure that <Ctrl>
<Home> was pressed. Verify the main system BIOS checksum.
E3h
The main system BIOS is good. Transfer control to the main
system BIOS.
E4h
Start the memory test.
E5h
The memory test is over. Initialize the interrupt vector table.
E6h
Initialize the DMA and interrupt controllers.
E7h
Determine the CPU internal clock frequency.
E8h
Initialize the I/O chipset, if any.
E9h
Program the CPU clock–dependent chip set parameters.
EAh
Enable the timer and the floppy diskette interrupt. Enable the
internal cache. Copy the boot block BIOS and pass control to
the boot block BIOS in the 0000h segment.
EDh
Initialize the floppy drive.
EEh
Look for a diskette in drive A:. Read the first sector of the
diskette.
EFh
Floppy read error.
F0h
Search for AMIBOOT.ROM in the root directory of the floppy
diskette in drive A:.
F1h
The AMIBOOT.ROM file is not in the root directory.
F2h
Read the FAT table. Analyze the FAT to find the clusters
occupied by the AMIBOOT.ROM.
F3h
Start reading the AMIBOOT.ROM file, cluster by cluster.
F4h
The AMIBOOT.ROM file is not the correct size.
F5h
Disable the internal cache. Raise the Vpp. Enable Flash write
and reset the Flash ROM.
FBh
Detect the flash type.
FCh
Start erasing flash blocks.
FDh
Program the Flash ROM in the E0000–EFFFFh region.
FEh
Start programming Flash at F0000–FFFFF region.
FFh
Flash programming is successful. The computer reboots.
