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Contec SPI-8450-LLVA User Manual

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CHAPTER 4 – CPU board resources
 
                                                                                                                                                    
SPI-8450-LLVA
31
Chapter 4  CPU Card Resources
4.1.   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 fardware 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 to 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