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Intel® Server Board SE7320SP2 & Intel Server Board SE7525GP2 TPS Functional Architecture
Revision 2.0
61
Figure 11 - Extended Memory Map
3.7.1.2.1 Main Memory
All installed memory greater than 1 MB is mapped to local main memory, up to 8 GB of physical
memory. Memory between 1 MB to 15 MB is considered to be standard ISA extended memory.
1 MB of memory starting at 15 MB can be optionally mapped to the PCI bus memory space.
The remainder of this space, up to 8 GB, is always mapped to main memory, unless TBSG
SMM is used which just under TOLM. The range can be from 128KB till 1MB. 1MB depends on
the BIOS setting C SMRAM is used which limits the top of memory to 256MB. BIOS occupies
512KB for 32bit SMI handler.
3.7.1.2.2 PCI Memory Space
Memory addresses below 4 GB range are mapped to the PCI bus. This region is divided into
three sections: High BIOS, APIC Configuration Space, and General-purpose PCI Memory. The
General-purpose PCI Memory area is typically used memory-mapped I/O to PCI devices. The
memory address space for each device is set using PCI configuration registers.
Main Memory
Address Region
FFFFFFFFh
FFE00000h
FEC0FFFFh
FEC00000h
Top of Low Memory (TOLM)
Depends on installed DIMMs
16MB
15MB
100000h
Hi
g
h BIOS Area
A
PIC S
p
ace
Optional Fixed
Memory Hole
PCI
Memory
Extended
chipset region
512KB Extended System
mana
g
ement RAM
Top Of Memory (TOM)
64GB