5. Board Resources
SPC-8520-LA, SPC-8521-LA
35
5. 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.
Table 5.1. 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
Table 5.2. Memory Segment
Memory Segments Comments
00000h - 9FFFFh 0 - 640K DOS Region
A0000h - BFFFFh Video Buffer
B0000h - B7FFFh Monochrome Adapter range
C0000h - CFFFFh Video BIOS
D0000h - DFFFFh Expansion Area
E0000h - EFFFFh Extended System BIOS Area
F0000h - FFFFFh System BIOS Area
100000h - FFFFFFFFh Extended Memory Area
100000h - 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
FEC00000h - FECFFFFFh,
FEE00000h - FEEFFFFFh
APIC configuration space
FFFE0000h - FFFFFFFFh High BIOS Area
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