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Technical Reference Guide
Compaq Deskpro EXS and Workstation 300 Personal Computers
Featuring the Intel Pentium 4 Processor
First Edition - December 2000
3-9
The memory controller and RDRAM are configured by BIOS during POST. Refer to Chapter 8 for
the configuration procedure performed by BIOS.
Figure 3-6 shows the system memory map.
NOTE:
All locations in memory are cacheable. Base memory is always mapped to DRAM. The next 128 KB
fixed memory area can, through the MCH, be mapped to DRAM or to PCI space. Graphics RAM area is
mapped to PCI or AGP locations.
Figure 3–6. System Memory Map
High BIOS Area
(2 MB)
Host/PCI Memory
Expansion
(496 MB)
FFFF FFFFh
1 MB
Graphics/SMRAM
RAM (128 KB)
System BIOS Area
(64 KB)
Fixed Mem. Area
(128 KB)
Base Memory
(512 KB)
Extended BIOS
Area
(64 KB)
Extended Memory
(
15 MB
)
FFE0 0000h
0100 0000h
00FF FFFFh
0010 0000h
000F 0000h
000E FFFFh
000F FFFFh
0000 0000h
0007 FFFFh
0008 0000h
0009 FFFFh
000B FFFFh
000A 0000h
512 KB
640 KB
16 MB
4 GB
Host, PCI,
ISA Area
DOS Compatibility
Area
Option ROM
(128 KB)
000E 0000h
000D FFFFh
000C 0000h
512 MB
Host,
PCI, AGP Area
PCI Memory
(18 MB)
FFDF FFFFh
FEC1 0000h
FEC0 FFFFh
APIC Config. Space
(64 KB)
FEBF FFFFh
FEC0 0000h
PCI Memory
Expansion
(3060 MB)
1FFF FFFFh
2000 0000h