Intel WX58BP Manual Do Utilizador

 35

 

 

This board uses 16 GB of addressable system memory. Typically, the address space 
allocated for PCI Conventional bus add-in cards, PCI Express* configuration space, 
BIOS (SPI Flash device), and chipset overhead resides above the top of DRAM (total 
system memory).   

On a system with 16 GB of system memory installed, it is not possible to use all of the 
installed memory due to system address space being allocated for other system-
critical functions. These functions include the following: 
  BIOS/SPI Flash device (16 Mbit) 
  Local APIC (19 MB) 
  Direct Media Interface (40 MB) 
  Front side bus interrupts (17 MB) 
  PCI Express* configuration space (256 MB) 
  IOH base address registers PCI Express* ports (up to 256 MB) 
  Memory-mapped I/O that is dynamically allocated for PCI Conventional and PCI 

Express* add-in cards (256 MB) 

The board provides the capability to reclaim the physical memory overlapped by the 
memory mapped I/O logical address space. The board remaps physical memory from 
the top of usable DRAM boundary to the 4 GB boundary to an equivalent-sized logical 
address range located just above the 4 GB boundary. Figure 8 shows a schematic of 
the system memory map. You can use all installed system memory when there is no 
overlap of system addresses.