Intel AN430TX Product Specification - Page 53

BIOS and Setup Program, 3.1 Introduction, 3.1.1 BIOS Flash Memory Organization

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3 BIOS and Setup Program 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 program, Power-On Self Tests (POST), advanced power management (APM), the PCI autoconfiguration utility, and Windows 95-ready Plug and Play. See Section 5.1 for the supported versions of these specifications. This motherboard supports 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 revision code. The initial production BIOS on the motherboard is identified as AN430TX0.86A. 3.1.1 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 areas as described in Table 40. The table shows the addresses in the ROM image in normal mode (the addresses change in BIOS Recovery Mode). Table 40. Flash Memory Organization Address (Hex) FFFF0000 - FFFFFFFF Size 64 KB Description Main BIOS * FFFEC000 - FFFEFFFF 16 KB Boot Block FFFEA000 - FFFEBFFF 8 KB Virtual Product Data (VPD) Extended System Configuration Data (ESCD) (DMI configuration data / Plug and Play data) FFFE9000 - FFFE9FFF 4 KB Used by BIOS (e.g., for Event Logging) FFFE8000 - FFFE8FFF 4 KB OEM logo or Scan Flash Area FFFC0000 - FFFE7FFF 160 KB Main BIOS Block * At runtime, only this section is shadowed into RAM below the 1 MB address 53

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53
3
BIOS and Setup Program
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 program, Power-On Self Tests (POST), advanced power management (APM), the PCI auto-
configuration utility, and Windows 95-ready Plug and Play.
See Section 5.1 for the supported
versions of these specifications.
This motherboard supports 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 revision
code.
The initial production BIOS on the motherboard is identified as AN430TX0.86A.
3.1.1
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 areas as described in Table 40.
The table shows the addresses in the ROM
image in normal mode (the addresses change in BIOS Recovery Mode).
Table 40.
Flash Memory Organization
Address (Hex)
Size
Description
FFFF0000 - FFFFFFFF
64 KB
Main BIOS *
FFFEC000 - FFFEFFFF
16 KB
Boot Block
FFFEA000 - FFFEBFFF
8 KB
Virtual Product Data (VPD) Extended System Configuration Data
(ESCD) (DMI configuration data / Plug and Play data)
FFFE9000 - FFFE9FFF
4 KB
Used by BIOS (e.g., for Event Logging)
FFFE8000 - FFFE8FFF
4 KB
OEM logo or Scan Flash Area
FFFC0000 - FFFE7FFF
160 KB
Main BIOS Block
*
At runtime, only this section is shadowed into RAM below the 1 MB address