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AM5728: AM5728BABCXA MLO loader

Part Number: AM5728

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.