Importance

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Abstract

A method for storing and executing an application program in a flash ROM, wherein the flash ROM is partitioned into two regions. One region is used for an operating System (OS) booting ROM and the other region is used for storing an application program. A board of a System boots with the OS booting ROM to execute the application program. This is accomplished by copying the application program to a memory without downloading it from an upper-level layer in hierarchy. Upon modifying the application program, the region of the flash ROM storing the application program is remotely updated with an application program being currently executed an the upper-level layer. Upon modification of the OS booting ROM, it is remotely updated. The method comprises the steps of: initializing hardware drivers; operating a loader and verifying version and checksum of a first application program; verifying version and checksum of a second application program; comparing the first application program with the second application program, copying the first application program to a memory in case the first and second application programs are identical to each other, and executing the first application program; and requesting a download of the second application program in case the first and second application programs are different from each other, storing the downloaded second application program in the flash ROM, and executing the second application program.

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First Claim