Method and apparatus for upgrading firmware boot and main codes in a programmable memory
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United States of America Patent
Stats
-
Aug 14, 2001
Grant Date -
Aug 2, 2001
app pub date -
Jun 22, 1998
filing date -
Jun 22, 1998
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A system for loading upgraded, that is, new boot code and/or main firm ware has a programmable memory that has two boot code regions. One of the regions holds the active boot code while the other region holds the inactive boot code. During a boot code upgrade, the boot code in the inactive region, is under control of the boot code in the active region, replaced with the new boot code. Once the replacement process is verified as having been successful and the vector table in the new boot code is copied to the processor vector table in the memory, the processor can be reset so that the new boot code becomes the active boot code and the previously active boot code becomes the inactive boot code.
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