Intel® Server Board SE7520AF2 TPS
Functional Architecture
Revision 1.2
73
Intel order number C77866-003
3.5.1.1.3
Video or SMM Memory
The 128 KB graphics adapter memory region, at 0A0000h to 0BFFFFh, is normally mapped to
the VGA controller on the PCI bus. This region is also the default region for SMM space.
3.5.1.1.4
Add-in Card BIOS and Buffer Area
The 128 KB region, between addresses 0C0000h to 0DFFFFh, is divided into eight segments of
16 KB segments mapped to ISA memory space, each with programmable attributes, for
expansion cards buffers. Historically, the 32 KB region from 0C0000h to 0C7FFFh has
contained the video BIOS location on the video card
3.5.1.1.5
Extended System BIOS
This 64 KB region from 0E0000h to 0EFFFFh is divided into four blocks of 16 KB each, and may
be mapped with programmable attributes to map to either main memory or to the PCI bus.
Typically this area is used for RAM or ROM. This region can also be used extended SMM
space.
3.5.1.1.6 System
BIOS
The 64 KB region from 0F0000h to 0FFFFFh is treated as a single block. By default, this area is
normally read/write disabled with accesses forwarded to the PCI bus. By manipulating
read/write attributes, this region can be shadowed into main memory.
3.5.1.2 Extended
Memory
Extended memory on Intel® Server Board SE7520AF2 is defined as all address space greater
than 1MB. Extended memory region covers 8GB maximum of address space from addresses
0100000h to FFFFFFFh, as shown in the following figure. PCI memory space can be remapped
to top of memory (TOM).