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Chapter 4
All versions of the AMIBIOS use Flash EPROM to store the system BIOS. The
advantage of Flash EPROM is the EPROM chip does not have to be replaced to update
the BIOS. The end user can actually reprogram the BIOS, using a ROM file supplied by
American Megatrends.
This chapter contains two procedures for programming Flash ROM:
•
•
A) Programming the Flash EPROM Using <Ctrl> <Home>
Step
Action
1
Turn power off.
2
Insert the floppy disk with the S875P.ROM file in the root directory into drive A:.
3
Press and hold the <Ctrl> and <Home> keys down while turning the power on. Continue to hold the
<Ctrl> and <Home> keys down until the access light on the floppy drive comes on. It may take 10
seconds or more before this light turns on.
Since AMIBIOS uses a 4 megabit BIOS, the flashing process may take up to 3 minutes.
4
Release the <Ctrl> and <Home> keys. AMIBIOS issues a series of beep codes that indicate that the
system BIOS ROM file is being updated.
5
When the flash ROM has successfully been programmed, the motherboard will reboot.
6
When the motherboard reboots, check the BIOS Release text at the bottom of the first boot screen to
make sure that the correct BIOS has been used.
Note:
Use the <TAB> key to switch between the POST screen and the boot logo.
7
The error message:
CMOS Checksum Bad
will appear during the first boot after a successful BIOS ROM update. This message indicates that
the NVRAM area in the system BIOS has been cleared. AMIBIOS will reconstruct the NVRAM area
before the system boots completely, so you can safely ignore this message.
8
Load the optional default and save.
Bootblock Actions
When you reprogram from system boot, the bootblock code performs the following:
Step
Action
1
Reads S875P.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:.
4
Generates a CPU reset, rebooting the system.
The bootblock part of the Flash EPROM is not programmed. Should you inadvertently
open the disk drive door or turn power off to the system while programming the Flash
EPROM, the bootblock will be unaffected. Simply turn power back on and begin the
Flash ROM programming process again.
Programming Flash ROM
A) Using the <Ctrl> <Home> keys
B) Using the AMIFlash utility
Chapter Four : Programming Flash ROM 121
Cont'd
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