I previously had discussion with some group members that whether is it possible to write the Raw Nand Flash using JTAG programmer . Some group members suggested , it will work . Per my understanding , it will not work as the Raw Flash interfaced with the NAND Controller of the processor. So to access the NAND Flash , NAND Controller must be initialized first . It is not like how we flash the ARM Cortex M series microcontrollers. Flashing NAND flash is only possible only when the NAND Controller is properly initialized. Please correct me if there is any flaw in my understanding.