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3 BIOS and Setup Utility
3.1 Introduction
The motherboard uses an Intel BIOS, which is stored in Flash EEPROM and can be
upgraded using a floppy disk-based program. In addition to the BIOS, the Flash EEPROM
contains the Setup utility, POST, APM, the PCI auto-configuration utility, and Windows 95-ready
Plug and Play.
This motherboard supports system BIOS shadowing, allowing the BIOS to execute from 64-bit
onboard write-protected DRAM.
The BIOS displays a sign-on message during POST identifying the type of BIOS and a five-digit
revision code. The initial production BIOS in the motherboard is identified as 1.00.01.CS1.
Information on BIOS functions can be found in the IBM PS/2 and Personal Computer BIOS
Technical Reference published by IBM, and the ISA and EISA Hi-Flex AMIBIOS Technical
Reference published by AMI. Both manuals are available at most technical bookstores.
3.2 BIOS Flash Memory Organization
The Intel PA28FB200BX 2 Mbit Flash component is organized as 256K x 8 (256 KB). The Flash
device is divided into eight areas, as described in Table 13.
Table 13.
Flash Memory Organization
System Address (Hex)
FFFF0000 - FFFFFFFF
FFFEC000 - FFFEFFFF
FFFEA000 - FFFEBFFF
FFFE9000 - FFFE9FFF
FFFE8000 - FFFE8FFF
FFFE0000 - FFFE7FFF
FFFD0000 - FFFDFFFF
FFFC0000 - FFFCFFFF
Size
Description
64 KB
Main BIOS
16 KB
Boot Block (available as UMB)
8 KB
VPD ESCD (DMI configuration data / Plug and Play data)
4 KB
Reserved for BIOS
4 KB
OEM logo or Scan User Flash
32 KB
POST BIOS (available as UMB)
64 KB
Reserved for BIOS
64 KB
Reserved for BIOS
43
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