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Method and apparatus for upgrading firmware boot and main codes in a programmable memory

  • US 6,275,931 B1
  • Filed: 06/22/1998
  • Issued: 08/14/2001
  • Est. Priority Date: 06/22/1998
  • Status: Expired due to Fees
First Claim
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1. A system for providing new boot code for a processor comprising:

  • a. a writable non-volatile memory comprising;

    i. one region having active non-write protected boot code therein, said boot code having the functionality to allow an instrument containing said memory to communicate with a process control system; and

    ii. another region having therein an inactive non-write protected boot code which is a functional equivalent of said active boot code;

    b. a source of said new boot code; and

    c. means including said processor and under control of said active boot code for replacing said inactive boot code with said new boot code from said source.

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