Per FAA we are only allowed to use 1 core out of the ARM A15. This must be bare metal. I am writing a boot loader for this. Since we can't replace the internal ROM bootloader, we wish to replace the MLO loader. I only need a serial and NOR flash driver - I have no problem with the drivers. - what I looking for is how to set up the clocks. how do you change to the external 25Mhz crystal. Is there source for the MLO loader. Thank you for any help.