910GL datasheet(208/426 Pages) INTEL

208 / 426 page

System Address Map

208

Datasheet

Figure 11-2. Microsoft MS-DOS* Legacy Address Range

Expansion Area

128KB (16KBx8)

000C_0000h

000D_FFFFh

896KB

Extended System BIOS (Lower)

64KB (16KBx4)

000E_0000h

000E_FFFFh

960KB

Legacy Video Area

(SMM Memory)

128KB

000A_0000h

000B_FFFFh

768KB

DOS Area

0000_0000h

0009_FFFFh

640KB

System BIOS (Upper)

64KB

000F_0000h

000F_FFFFh

1MB

11.1.1

DOS Range (0h – 9_FFFFh)

The DOS area is 640 KB (0000_0000h – 0009_FFFFh) in size and is always mapped to the main

memory controlled by the (G)MCH.

11.1.2

Legacy Video Area (A_0000h–B_FFFFh)

The legacy 128-KB VGA memory range, frame buffer, (000A_0000h – 000B_FFFFh) can be

mapped to IGD, to PCI Express, and/or to the DMI. The appropriate mapping is programmable.

Based on the programming, priority for VGA mapping is constant. The (G)MCH always decodes

internally mapped devices first. Internal to the 82915G/82915GV/82915GL/82910GL GMCH,

decode precedence is always given to the IGD. The (G)MCH always positively decodes internally

mapped devices, namely the IGD (82915G/82915GV/82915GL/82910GL only) and PCI Express.

Subsequent decoding of regions mapped to PCI Express or the DMI depends on the

programming. This region is also the default for SMM space.

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