Functional Architecture
Intel® Server Boards SE7320SP2 and SE7525GP2
Revision
4.0
48
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 128 KB till 1 MB. 1
MB depends on the BIOS setting C SMRAM is used which limits the top of memory to
256 MB. BIOS occupies 512 KB for 32-bit SMI handler.
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.
High BIOS
The top 1 MB of Extended Memory under 4 GB is reserved for the system BIOS,
extended BIOS for PCI devices, and A20 aliasing by the system BIOS. The lntel
®
Xeon
®
processor begins executing from the high BIOS region after reset.
I/O APIC Configuration Space
A 64 KB block located 20 MB below 4 GB (0FEC00000 to 0FEC0FFFFh) is reserved for
the I/O APIC configuration space. The first I/O APIC is located at FEC00000h. The
second I/O APIC is located at FEC80000h. The third I/O APIC is located at FEC80100h.
Extended lntel
®
Xeon
®
Processor Region (above 4 GB)
An lntel
®
Xeon
®
processor based system can have up to 64 GB of addressable memory.
With the chipset only supporting 16 GB of addressable memory, the BIOS uses an
extended addressing mechanism to use the address ranges.
3.7.1.3 Memory
Shadowing
System BIOS and option ROM can be shadowed in main memory. Typically this is done to allow
ROM code to execute more rapidly out of RAM. ROM is designated read-only during the copy
process while RAM at the same address is designated write-only. After copying, the RAM is
designated read-only. After the BIOS is shadowed, the attributes for that memory area are set to
read only so that all writes are forwarded to the expansion bus.
Summary of Contents for SE7320SP2 - 800MHZ Ecc Ddr Xeon
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