Datasheet

Datasheet, Volume 2 29
Processor Configuration Registers
Case 1 – Less than 4 GB of Physical Memory (no remap)
• Populated Physical Memory = 2 GB
• Address Space allocated to memory mapped IO = 1 GB
• Remapped Physical Memory = 0 GB
• TOM – 00_7FF0_0000h (2 GB)
• ME base – 00_7FF0_0000h (1 MB)
• ME Mask – 00_7FF0_0000h
• TOUUD – 00_0000_0000h (Disable - Avoid access above 4 GB)
• TOLUD – 00_7FE0_0000h (2 GB minus 1 MB)
• REMAPBASE – 7F_FFFF_0000h (default)
• REMAPLIMIT – 00_0000_0000h (0 GB boundary, default)
Figure 2-5. Case 1 – Less than 4 GB of Physical Memory (no remap)
OS VISIBLE
< 4 GB
GFX Stolen
ME-UMA
Wasted
(Only if 4 GB
minus PCI
MMIO space is
greater than
4 GB minus ME
stolen base)
TSEG
“LOW
DRAM”
PCI MMIO
HOST/SYSTEM VIEW
PHYSICAL MEMORY
(DRAM CONTROLLER VIEW)
TSEG
0
0
TSEG BASE
TOM
GFX GTT Stolen BASE
ME BASE
1 MB aligned
1 MB aligned
1 MB aligned
1 MB aligned
1 MB aligned
4 GB
TOLUD BASE
1 MB aligned
TOUUD BASE
1 MB aligned
GFX Stolen BASE
1 MB aligned
GFX GTT
STOLEN