Datasheet
Datasheet, Volume 2 31
Processor Configuration Registers
2.2.3.1.3 Case 3 — 4 GB or less of Physical Memory
Note: Internal graphics is not supported on the Intel Xeon processor L3406.
In this case the amount of memory remapped is the range between TOLUD and TOM
minus the ME stolen memory. This physical memory will be mapped to the logical
address range defined between the REMAPBASE and the REMAPLIMIT registers.
Example: 3 GB Physical Memory, with 2 GB allocated to Memory Mapped I/O
• Populated Physical Memory = 3 GB
• Address Space allocated to memory mapped I/O = 2 GB
• Remapped Physical Memory = 1 GB
• TOM – 030h (3 GB)
• ME stolen size – 00000b (0 MB)
• TOUUD – 1400h (5GB) (1 MB aligned)
• TOLUD – 02000h (2 GB) (64 MB aligned because remap is enabled and the remap
register has 64 MB granularity)
• REMAPBASE – 040h (4 GB)
• REMAPLIMIT – 04Fh (5 GB – 1 boundary)
Figure 2-7. 4 GB or Less of Physical Memory
“LOW
DRAM”
OS
VISIBLE
< 4 GB
PCI MMIO
HOST/SYSTEM VIEW
PHYSICAL MEMORY
(DRAM CONTROLLER VIEW)
TSEG TSEG
0
0
TSEG BASE
GFX Stolen
EP-UMA
(1-64 MB)
TOM
GFX Stolen BASE
EP Stolen
BASE
1 MB aligned
64 MB aligned
1 MB aligned
64 MB aligned
RECLAIM BASE
RECLAIM LIMIT =
RECLAIM BASE + x
64 MB aligned
64 MB aligned
x
64 MB aligned for reclaim
0 MB –
63 MB
Wasted
1 MB aligned
4 GB
64 GB
HMMIO
TOLUD BASE
64 MB aligned
TOUUD BASE
GFX GTT
Stolen
GFX GTT Stolen BASE
1 MB aligned