I have a question about the interrupt vector table for NXP LPCxxxx processors. The manual states that the reserved vector in the table must be filled with a value so that the addition of all vectors give a value of zero. This is checked by the internal bootloader before it starts the application. In the startup files for the processors there is only a nop instruction. In which part of the compiling / linking / download process is this value replaced and how it is done ?
I post this question because I have a problem with an app that is linked to start at address 0x8000 in flash and will be loaded with a self made boot loader.
My boot loader will also check the interrup vector table in the loaded app and only vectors the the app's vector table if it is O.K.