At 0x14 the user should insert a signature (checksum). This signature enables the bootloader to determine if there is valid user code in the Flash. Currently most of the Flash programming tools (debuggers and ISP utility) have this feature built-in so the end user need not worry about it. If the tool does not provide this feature then the value has to be computed manually and has to be inserted at 0x14. Details on computation of checksum could be found in the Flash programming chapter in the ARM LPC device User Manual.
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