Multiplex execution-path system
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United States of America Patent
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-
Mar 4, 2008
Grant Date -
Jul 13, 2006
app pub date -
Jan 7, 2005
filing date -
Jan 7, 2005
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A multiple execution-path flash system includes a main flash image with primary and secondary POST and Boot executable files. The secondary executables are offset from the primary executables by a predetermined offset address. If corrupted data is encountered during Boot, the exception handler sets an offset bit resulting in the predetermined offset address being added to the current instruction address. If corrupted data is encountered in the secondary executables, the offset bit is reset. An optional redundant flash image may also be used. A failure at the same relative address in the primary and secondary executables of the main flash image will cause the exception handler to transfer control to the redundant flash image. A subsequent failure at the same relative address in the primary and secondary executables of the redundant flash image will cause the redundant exception handler to transfer control back to the main flash image.
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