sequencer.c

When you build the 2nd stage bootloader which I have been calling the preloader, this file is managed automatically. So there shouldn't be any reason for you attempt to manage the file yourself since the tools generate it and it gets compiled into the rest of the preloader code when you run make on the output from the bsp-editor tool. You should also never attempt to call the code contained in that file from your own user code, it will affect the characteristics of the memory temporarily so you should let this happen only at boot time (automatically).