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5. CPU Board Resources
SEH-9450-LAS
29
5. CPU Board Resources
System address map
The GMCH memory map includes a number of programmable ranges. All of these ranges must be
unique and non-overlapping. There are no hardware interlocks to prevent problems in the case of
overlapping ranges. Accesses to overlapped ranges may produce indeterminate results.
Compatibility Area
Address Description
0 - 640KB DOS area
640 - 768KB Video Buffer area
768 - 896KB Expansion Area
896 - 960KB Extended System BIOS Area
960 - 1MB System BIOS Area
Memory Segment
Memory Segments Comments
00000h - 9FFFFh 0 - 640K DOS Region
A0000h - BFFFFh Video Buffer
B0000h - B7FFFh Monochrome Adapter range
C0000h - CBFFFh Video BIOS
CC000h - DFFFFh Expansion Area
E0000h - EFFFFh Extended System BIOS Area
F0000 - FFFFFh System BIOS Area
100000h - 7FFFFFFFh Extended Memory Area
00100000 to Top of Main Memory Main DRAM Address Range
Top of Main Memory Extended SMRAM Address Range
Top of Main Memory To 4GB PCI Memory Address Range
FEC0000h - FECFFFFFh,
FEE00000h - FEEFFFFFh
APIC configuration space
FFE0000h - FFFFFFFFh High BIOS Area
PCI Routing Information
IDSEL INT Onboard Function
AD25 INT H LAN Intel 82573E
AD26 INT G SATA