The normal process is that is loads MLO which loads Logic Loader (lboot.elf). Logic Loader must load lboot/lboot.elf nk.bin into memory then execute. You may want to consider a splash screen if you have an LCD to display a message or something while it's loading lboot.elf nk.bin.
Since the default boot sequence attempts to boot NAND last, you can speed this up a bit, by pulling SYSBOOT5 low. This tell it to make NAND the first boot device. Unfortunately, it is shared with UARTA_DTR. Before you try this, I will look into that to see whether LogicLoader is driving that pin or not. Will your product need UARTA_DTR / GPIO7?
adam