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82X38 Datasheet(PDF) 39 Page - Intel Corporation |
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82X38 Datasheet(HTML) 39 Page - Intel Corporation |
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39 / 342 page  Datasheet 39 System Address Map 3.2.1 ISA Hole (15 MB –16 MB) A hole can be created at 15 MB–16 MB as controlled by the fixed hole enable in Device 0 space. Accesses within this hole are forwarded to the DMI Interface. The range of physical DRAM memory disabled by opening the hole is not remapped to the top of the memory – that physical DRAM space is not accessible. This 15–16 MB hole is an optionally enabled ISA hole. The ISA Hole is used by validation and customer SV teams for some of their test cards. That is why it is being supported. There is no inherent BIOS request for the 15–16 MB window. Figure 4. Main Memory Address Range DOS Compatibility Memory Main Memory ISA Hole (optional) Main Memory Main Memory TSEG (1MB/2MB/8MB, optional) PCI Memory Range LT FLASH APIC 4 GB 0h 0010_0000h 00F0_0000h 0100_0000h 8 GB FFFF_FFFFh . . . . . |
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