Datasheet, Volume 2 29
Processor Configuration Registers
2.2.3.1.1 Case 1 — Less than 4 GB of Physical Memory (no remap)
• Populated Physical Memory = 2 GB
• Address Space allocated to memory mapped I/O = 1 GB
• Remapped Physical Memory = 0 GB
• TOM – 020h (2 GB)
• ME stolen size – 00001b (1 MB)
• TOUUD – 07FFh (2 GB minus 1 MB) (1 MB aligned)
• TOLUD – 01F00h (2 GB minus 64 MB) (63 MB wasted because MMIO space required
is greater than 4G to EP stolen base.)
• REMAPBASE – 3FFh (64 GB – 1 boundary, default)
• REMAPLIMIT – 000h (0GB boundary, default)
Figure 2-5. Case 1 — Less than 4 GB of Physical Memory (no remap)
“LOW
DRAM”
OS
VISIBLE
< 4 GB
PCI MMIO
HOST/SYSTEM VIEW
PHYSICAL MEMORY
(DRAM CONTROLLER VIEW)
TSEG
0
0
TSEG BASE
GFX Stolen
EP-UMA
(0-64 MB)
TOM
GFX GTT Stolen BASE
EP Stolen
BASE
1 MB aligned
1 MB aligned
64 MB aligned
Wasted
(Only if 4G
minus PCI
MMIO
space is
greater
than 4G
minus EP
stolen
base)
64 MB aligned
1 MB aligned
1 MB aligned
4 GB
TOLUD BASE
1 MB aligned
TOUUD BASE
1 MB aligned
GFX GTT
STOLEN
GFX Stolen BASE
1 MB aligned
TSEG
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