HP A2Y15AV Manual Do Utilizador

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Datasheet, Volume 2

The memory boundaries of interest are:

• Bottom of Logical Address Remap Window defined by the REMAPBASE register, 

which is calculated and loaded by BIOS.

• Top of Logical Address Remap Window defined by the REMAPLIMIT register, which 

is calculated and loaded by BIOS.

• Bottom of Physical Remap Memory defined by the existing TOLUD register. 
• Top of Physical Remap Memory, which is implicitly defined by either 4 GB or TOM 

minus Intel Management Engine stolen size. 

Mapping steps:

1. Determine TOM
2. Determine TOM minus Intel ME stolen size
3. Determine MMIO allocation
4. Determine TOLUD 
5. Determine graphics stolen base
6. Determine graphics GTT stolen base
7. Determine TSEG base
8. Determine remap base/limit
9. Determine TOUUD

The following diagrams show the three possible general cases of remapping. 

• Case 1: Less than 4 GB of Physical Memory, no remap
• Case 2: Greater than 4 GB of Physical Memory
• Case 3: 4 GB or Less of Physical Memory