Manufacturing mode for secure firmware using lock byte
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United States of America Patent
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Apr 18, 2017
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app pub date -
Oct 5, 2007
filing date -
Oct 5, 2007
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Abstract
Upon initialization or startup of an electronic device, the device checks a predetermined section of non-volatile memory, referred to as the signature byte or lock byte, and allows either the manufacturing mode which allows for installation of the final or production version of firmware to be loaded into non-volatile memory, or the production mode which write-protects certain portions of non-volatile memory before giving operating control of the electronic device to another program, for example, an operating system. By only allowing execution of operating system or other executable code after write-protecting certain portions of non-volatile memory, system security, integrity, and robustness are substantially increased.
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