Technical Reference Guide
Figure 3-3 shows the system memory map.
| FFFF FFFFh | High BIOS Area |
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| FFE0 0000h | (2 MB) |
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| FFDF FFFFh | PCI Memory |
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| FEC1 0000h | (18 MB) |
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| FEC0 FFFFh | APIC Config. Space |
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| FEC0 0000h | (64 KB) |
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| FEBF FFFFh |
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Host, |
| PCI Memory |
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PCI, AGP Area |
| Expansion |
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| (3060 MB) |
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| 2000 0000h |
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| 1FFF FFFFh |
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| Host/PCI Memory |
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| Expansion |
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| (496 MB) |
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| 0100 0000h |
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Host, PCI, | 00FF FFFFh | Extended Memory |
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ISA Area |
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0010 0000h | (15 MB) |
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| 000F FFFFh |
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| System BIOS Area |
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| (128 KB max [2] ) |
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| 000E 0000h |
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| 000D FFFFh |
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| Option ROM |
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| (128 KB) |
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| 000C 0000h |
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| 000B FFFFh |
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DOS Compatibility |
| Graphics/SMRAM |
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Area | 000A 0000h | RAM (128 KB) |
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| 0009 FFFFh | Fixed Mem. Area |
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| 0008 0000h | (128 KB) |
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| 0007 FFFFh |
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| Base Memory |
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| (512 KB) |
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| 0000 0000h |
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4 GB
[1]
16MB
1 MB
640KB
512KB
NOTE:
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 area is mapped to PCI or AGP locations.
[1]D315 model, 1 GB; d325, 2 GB
[2]Area typically less according to need and Setup configuration. Default area is
Figure 3–3. System Memory Map
Compaq D315 and hp d325 Personal Computers
Featuring the AMD Athlon XP Processor
Second Edition - April 2003