301467-005 Datasheet, PDF (221/426 Pages) Intel Corporation – Express Chipset

System Address Map
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11.4.12 Legacy VGA and I/O Range Decode Rules
The legacy 128-KB VGA memory range 000A_0000h-000B_FFFFh can be mapped to IGD
(82915G/82915GV/82915GL/82910GL GMCH only), to PCI Express (Device #1), and/or to the
DMI depending on BIOS programming. Priority for VGA mapping is constant in that the
(G)MCH always decodes internally mapped devices first. Internal to the GMCH, decode
precedence is always given to IGD. The (G)MCH always positively decodes internally mapped
devices, namely the IGD and PCI Express.
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Datasheet
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