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Home Processing Data Method-for-storing-board-revision

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Details
Inventors: Broyles, Paul J.; Piwonka, Mark A.; Parsons, Daniel G.;
Assignee: Compaq Computer Corporation (Houston, TX)
Primary Examiner: Lee; Thomas
Assistant Examiner: Cao; Chun
Attorney, Agent or Firm: Akin, Gump, Strauss, Hauer & Feld, LLP

A computer system contains a revision indicator which is stored in a protected special area of computer memory. The revision indicator specifies the revision of the hardware actually present in the system. The revision indicator data is presented by the computer during power up so that a user may be aware of the type and configuration of the computer system hardware. The revision indicator may be displayed by the computer system BIOS during power on self test (POST), for example. The memory storing the revision indicator is protected from erroneous or unauthorized change.

DETAILED DESCRIPTION Briefly, the present invention allows manufacturing entities to place a "revision indicator" in a special area of memory that cannot be altered.
The revision indicator is stored in a region of memory not available to the user.
The protected area is a flash memory, which must be physically removed to be reprogrammed.
A person must physically remove the memory device containing the revision indicator, place the revision indicator memory in an external device that is not part of the computer system, and apply external voltages and currents not available within the computer system to the memory in order to change the revision indicator.
When a user powers on the computer system, the revision indicator is presented to the basic input/output system or BIOS, and is available while the boot software is running.
For example, the revision indicator may be presented during the installation and execution of the Basic Input Output System (BIOS), Power on Self Test (POST), and operating system.


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