BIOS DISPLAYS MEMORY SIZE WITH 4GB OR MORE

Subject: BIOS DISPLAYS MEMORY SIZE WITH 4GB OR MORE
Updated Netfinity server RETAIN Tip: 

    Record number:       H167887
    Device:              D/T8681
    Model:               M
    Hit count:           UHC00006
    Success count:       USC0000
    Publication code:    PC50
    Tip key:             005
    Date created:        O99/11/23
    Date last altered:   A99/12/15
    Owning B.U.:         USA


Abstract: BIOS DISPLAYS MEMORY SIZE WITH 4GB OR MORE

TEXT:

BIOS displays a smaller memory size with 4GB or more of memory installed.

SYMPTOMS:

Whenever 4GB (or more) of memory is installed, the BIOS will display the total size minus the amount of memory which is being reserved for the PCI, I/O, and other resources.

PROBLEM ISOLATION AIDS:

•  The system is any of the following IBM Netfinity servers:

          a Netfinity 8500R server, Type 8681, any Model.
          a Netfinity 7000 M10 server, Type 8680, any Model.
          a Netfinity 5600 server, Type 8664, any Model.
          a Netfinity 5500 M20 server, Type 8662, any Model.
   

•  The system has the described symptom.

DETAILS:

Each PCI device is allowed to claim some amount of memory resource.
BIOS gathers the resource requirements of all the PCI devices installed and reserves the memory for the PCI devices.

If the memory size is less than 4GB, BIOS will display the full amount of memory installed in the system.
For any memory amount of 4GB or greater, POST may display less than 4GB of memory depending on what resources have been reserved for PCI devices.
The amount of memory displayed will vary depending on the system and configuration.

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