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2
Technical Reference
2.1
Memory Resources
2.1.1
Addressable Memory
The Intel Compute Stick utilizes up to 4 GB of addressable system memory. Typically the address
space that is 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 that has 8 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 (64 Mbit)
•
Local APIC (19 MB)
•
Direct Media Interface (40 MB)
•
PCI Express configuration space (256 MB)
•
SoC base address registers PCI Express ports (up to 256 MB)
•
Integrated graphics shared memory (up to 512 MB; 64 MB by default)
The Intel Compute Stick provides the capability to reclaim the physical memory overlapped by the
memory mapped I/O logical address space. Physical memory is remapped 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. All installed system memory can be used when there is no overlap of
system addresses.
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