American Megatrends Enterprise-III User Manual page 90

Overview,
Continued
How the Boot Block Utility Works
The Boot Block BIOS contains the code protected by the hardware locking feature. This code is used in the Boot
Block BIOS to reprogram the onboard Flash EPROM.
After BIOS Power-On Self Test (POST), the Boot Block BIOS code tests the validity of the main system BIOS
code. If the system BIOS is OK, the Boot Block BIOS passes control to the system BIOS.
If the main system BIOS is bad or J2 is shorted, it does not pass control to the system BIOS but instead looks for a
floppy disk to reprogram the system BIOS.
What the Boot Block Code Does
The Boot Block code:
1. reads S68P.ROM from the root directory of the floppy disk in drive A:,
2. erases the Flash EPROM,
3. programs the Flash EPROM with the data read from the floppy disk in drive A:, and
4. generates a CPU reset, rebooting the system.
The Boot Block portion of Flash EPROM is not programmed.
S68P.ROM
S68P.ROM contains the updated main BIOS code. It must be present in the root directory of the floppy disk before
the onboard Flash EPROM can be reprogrammed. The file that has the main BIOS code must be named S68P.ROM.
Enterprise-III EISA VLB Motherboard User's Guide
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