beautypg.com

2 memory mapping and pre-allocation – HP DC5850 User Manual

Page 33

background image

Technical Reference Guide

www.hp.com

3-5

Processor/Memory Subsystem

Figure 3-2. System Memory Map (for maximum of 8 gigabytes)

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 areas are mapped to PCI locations.

High BIOS Area

PCI

256 MB

16 MB

8 GB

IGP

DOS

640 KB

1 FFFF FFFEh

1 MB

Main

BIOS

00FF FFFFh

FFE0 0000h

000F FFFFh

Base Memory

Extended BIOS

Legacy Video

Expansion Area

0000 0000h

0010 0000h

0100 0000h

Main

F000 0000h

Memory

Area

Memory

Memory
Area

Compatibilty
Area

Main

Memory

32 MB

4 GB

4.2 GB