Technical Reference Guide

Figure 3-4 shows the system memory map.

 

FFFF FFFFh

High BIOS Area

 

 

FFE0 0000h

(2 MB)

 

 

FFDF FFFFh

PCI Memory

 

 

 

 

 

FEC1 0000h

(18 MB)

 

 

 

 

 

FEC0 FFFFh

APIC Config. Space

 

 

FEC0 0000h

(64 KB)

 

 

 

 

 

FEBF FFFFh

 

 

Host,

 

PCI Memory

 

PCI, AGP Area

 

Expansion

 

 

 

(3060 MB)

 

 

2000 0000h

 

 

 

1FFF FFFFh

 

 

 

 

Host/PCI Memory

 

 

 

Expansion

 

 

 

(496 MB)

 

 

0100 0000h

 

 

Host, PCI,

00FF FFFFh

Extended Memory

 

ISA Area

 

 

0010 0000h

(15 MB)

 

 

 

 

 

 

 

000F FFFFh

System BIOS Area

 

 

000F 0000h

(64 KB)

 

 

000E FFFFh

Extended BIOS

 

 

000E 0000h

Area

 

 

000D FFFFh

 

 

 

 

Option ROM

 

 

 

(128 KB)

 

 

000C 0000h

 

 

 

000B FFFFh

 

 

DOS Compatibility

 

Graphics/SMRAM

 

Area

000A 0000h

RAM (128 KB)

 

 

 

 

 

0009 FFFFh

Fixed Mem. Area

 

 

 

 

 

0008 0000h

(128 KB)

 

 

 

 

 

0007 FFFFh

 

 

 

 

Base Memory

 

 

 

(512 KB)

 

 

0000 0000h

 

 

 

 

 

 

4 GB

512 MB

16MB

1 MB

640KB

512KB

NOTE: All locations in memory are cacheable. Base memory is always mapped to DRAM. The next 128 KB fixed memory area can, through the north bridge, be mapped to DRAM or to PCI space. Graphics RAM area is mapped to PCI or AGP locations.

Figure 3–3.System Memory Map

Compaq Evo and Workstation Personal Computer 3-7

Featuring the Intel Pentium 4 Processor

Second Edition - January 2003

Page 53
Image 53
Compaq W4000 manual Shows the system memory map