Electrical computers and digital processing systems: support – Digital data processing system initialization or configuration – Loading initialization program
Reexamination Certificate
2006-07-04
2006-07-04
Cao, Chun (Department: 2115)
Electrical computers and digital processing systems: support
Digital data processing system initialization or configuration
Loading initialization program
C713S001000, C714S036000
Reexamination Certificate
active
07073053
ABSTRACT:
Methods and apparatus are disclosed for a boot progression scheme for reliably initializing a system. A boot progression data structure is maintained to indicate which of multiple boot images should be initially loaded upon startup of the system. During a boot phase, the boot progression data structure (e.g., a stack or other data structure) is modified to indicate a next boot image to use upon a next startup of the system. If the boot image provides a functional system, then the boot progression data structure is updated to once again indicate to boot with this image, and possibly removing references to other boot images. Otherwise, a reset or restart operation is performed to boot using another image. In this manner, a remote system can be upgraded across a network, and should the upgrade not perform correctly, the system reverts to a previous boot image.
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Bar-Eli Eldad
Oz Doron
Tamir Rami
Cao Chun
Cisco Technology Inc.
Connolly Mark
The Law Office of Kirk D. Williams
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