NCR 7454, Руководство пользователя по оборудованию

Страница: 32 / 180

1-20 Chapter 1: Product Overview
FLASH memory Implementation
The Intel E28F800B5 ‐ T70 Flash component is organized onboard as
1024 K x 8 (1 MB). While a typical PC BIOS image including video and
LAN boot ROM code normally fits in 256 K on the Pentium Board and
512 K in the Pentium III/Celeron board, the boards support a 1 MB
flash ROM. The current Phoenix BIOS release only requires 256 K of
this 1 MB total. The Flash device contains the PC System BIOS along
with the Video BIOS and LAN boot ROM which compresses the ROM
images into a single binary image.
The Flash device is divided into four areas, as described below.
System Address FLASH Memory Area
F0000H FFFFFH 64 K Main BIOS
EE000H EFFFFH 8 K System BIOS Reserved during boot
ED000H EDFFFH 4 K Plug and Play ESCD Storage Area
E0000H ECFFFH 52 K System/VGA BIOS Reserved during boot
BIOS Upgrades
Flash memory makes distributing BIOS upgrades easy. A new version
of the BIOS can be installed from the hard disk, network or through a
serial port.
The disk ‐ based Flash upgrade utility, PHLASH.EXE, ensures the
upgrade BIOS extension matches the target system to prevent
accidentally installing a BIOS for a different type of system.
Setup Utility
The ROM ‐ based Setup utility permits the system configuration to be
modified without opening the system for most basic changes. The
Setup utility is accessible only during the Power ‐ On Self Test (POST)
by pressing the <F2> key after the POST memory test has begun and
before boot begins. A prompt may be enabled that informs users to
press the <F2> key to access Setup.