HP A2Y15AV Manuale Utente
Datasheet, Volume 2
19
Processor Configuration Registers
2.3.1
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 16 KB sections (total of 8 sections) – Expansion Area
• 896–960 KB in 16 KB sections (total of 4 sections) – Extended System BIOS Area
• 960 KB–1 MB Memory – System BIOS Area
• 640–768 KB – Legacy Video Buffer Area
• 768–896 KB in 16 KB sections (total of 8 sections) – Expansion Area
• 896–960 KB in 16 KB sections (total of 4 sections) – Extended System BIOS Area
• 960 KB–1 MB Memory – System BIOS Area
Figure 2-1. System Address Range Example
Main
Memory
Add Range
OS
VISIBLE
< 4 GB
PCI
Memory
Add. Range
(subtractively
decoded to
DMI)
Host/System View
Physical Memory
(DRAM Controller View)
TSEG
0
0
TSEG BASE
GFX Stolen
(0-256 MB)
ME-UMA
TOM
GFX GTT Stolen BASE
MESEG BASE
1 MB aligned
1 MB aligned
OS invisible
Reclaim
1 MB aligned
for reclaim
1 MB aligned
4 GB
FEC0_0000
1 MB aligned
TOUUD BASE
1 MB aligned
GFX GTT
STOLEN
(0-2 MB)
GFX Stolen BASE
1 MB aligned
TSEG
(0-8 MB)
Legacy
Add. Range
1 MB
Main
memory
Address
Address
Range
OS visible
> 4 GB
Main
Memory
Reclaim
Reclaim
Add Range
Reclaim BASE
Reclaim Limit =
Reclaim Base + x
1 MB aligned
PCI
Memory
Add. Range
(subtractively
decoded to
DMI)
1 MB aligned
512 GB
X
Flash, APIC
Intel
®
TXT
(20 MB)
TOLUD BASE