Functional Architecture

 

Intel® Server Board SE7520JR2

 

 

 

 

 

 

E

D/R

 

D/R

 

E

E

 

D/R

 

 

 

 

 

 

D/R

S/R

 

S/R

 

E

D/R

 

S/R

 

 

 

 

 

Table 5: Supported DDR2-400 DIMM Populations

 

Bank 3 – DIMMs 3A, 3B

Bank 2 – DIMMs 2A, 2B

Bank 1 – DIMMs 1A, 1B

 

S/R

S/R

S/R

 

 

 

 

 

E

S/R

S/R

 

 

 

 

MCH

E

E

S/R

 

 

 

E

D/R

D/R

 

E

E

D/R

 

 

 

 

 

E

S/R

D/R

 

 

 

 

 

S/R

S/R

D/R

 

 

 

 

Note: On the Server Board SE7520JR2, when using all dual rank DDR-333 or DDR2-400 DIMMs, a total of four DIMMs can be populated. Configuring more than four dual rank DDR- 333 or DDR2-400 DIMMs will result in the BIOS generating a memory configuration error.

Note: Memory between 4GB and 4GB minus 512MB will not be accessible for use by the operating system and may be lost to the user, because this area is reserved for BIOS, APIC configuration space, PCI adapter interface, and virtual video memory space. This means that if 4GB of memory is installed, 3.5GB of this memory is usable. The chipset should allow the remapping of unused memory above the 4GB address, but this memory may not be accessible to an operating system that has a 4GB memory limit.

3.3.3ECC Memory Initialization

ECC memory must be initialized by the BIOS before it can be used. The BIOS must initialize all memory locations before using them. The BIOS uses the auto-initialize feature of the MCH to initialize ECC. ECC memory initialization cannot be aborted and may result in a noticeable delay in the boot process depending on the amount of memory installed in the system.

3.3.4Memory Test

System memory is classified as base and extended memory. Base memory is memory that is required for POST. Extended memory is the remaining memory in the system. Extended memory may be contiguous or may have one or more holes. The BIOS memory test accesses all memory except for memory holes.

Memory testing consists of separate base and extended memory tests. The base memory test runs before video is initialized to verify memory required for POST. The BIOS enables video as early as possible during POST to provide a visual indication that the system is functional. At some time after video output has been enabled, BIOS executes the extended memory test. The

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Revision 1.0

 

C78844-002