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Method for attachment of a bios device into a computer system using the system memory data bus

  • US 6,182,213 B1
  • Filed: 09/30/1997
  • Issued: 01/30/2001
  • Est. Priority Date: 09/30/1997
  • Status: Expired due to Term
First Claim
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1. A method of accessing a BIOS device in a computer system having a central processing unit, a core logic, a system memory bus that can operate in a normal mode, and a BIOS device on the system memory bus, wherein the system memory bus includes a system memory data bus, the method comprising the acts of:

  • in the core logic, decoding signals on the system memory bus;

    if a BIOS access is desired, preventing the system memory bus from operating in the normal mode;

    presenting an address to the BIOS device by having the core logic place the address on the system memory data bus;

    in the core logic, receiving data stored in the BIOS device at the address by sampling a different portion of the system memory data bus;

    transferring the data to the central processing unit; and

    then operating the system memory data bus in the normal mode.

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