G35 datasheet(46/351 Pages) INTEL

46 / 351 page

System Address Map

Datasheet

Figure 3-1 represents system memory address map in a simplified form.

Figure 3-1. System Address Ranges

PCI Memory

Address

Range

(subtractively

decoded to

DMI

Device

Bars

Device

Bars

Independently Programmable

Non-Overlapping Windows

Main Memory

Reclaim

Address

Range

Reclaim Limit =

Reclaim Base +X

(64 MB Aligned)

TOUUD Base

Reclaim Base

(64 MB Aligned)

Main Memory

Address

Range

Device

Bars

Device 0

GGC (GFX

Stolen

Mem)

Device

Bars

TOLUD

Base

(64 MB

Aligned)

PCI Memory

Address

Range

(subtractively

decoded to

DMI)

Independently Programmable

Non-Overlapping Windows

TSEG

Main Memory

Address

Range

Legacy

Address

Range

1 MB

64 GB

TOM

64 MB Aligned

EP-UMA

(1 – 64 MB)

0 – 63 MB

Unusable

EP Stolen Base

64 MB Aligned

1 MB Aligned

OS Visible

> 4 GB

4 GB

OS Invisible

Reclaim

GFX Stolen

(1 – 64 MB)

TSEG

(0 – 8 MB)

OS Visible

< 4 GB

64 MB Aligned for

Reclaim

1 MB Aligned

Memap_Sys_Addr_Ranges

Host/System

View

Physical Memory

(DRAM Controller

View)

Device

M HBA

3.1

Legacy Address Range

This area is divided into the following address regions:

• 0 - 640 KB – DOS Area

• 640 - 768 KB – Legacy Video Buffer Area

• 768 - 896 KB in 16KB sections (total of 8 sections) – Expansion Area

• 896 - 960 KB in 16KB sections (total of 4 sections) – Extended System BIOS Area

• 960 KB - 1 MB Memory – System BIOS Area

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