In almost all the microcontroller codes the peripheral initialization functions like uart initialization, spi initialization are written along with the different application codes. These initialization functions are actually repetitions of the original initialization functions. The same is the case with the external hardware initialization like LCD initialization, GSM modem initialization etc. Suppose the case in which the application codes required are stored in a memory chip or SD memory card so that there is an option to select between the applications. If all the application codes have the same functions for peripheral and external hardware initialization that will simply increase the size of the code only and the size of the memory required to store the codes. It will take too much time for the Boot-Loader to load such a large size application and there will be flash memory shortage issues due to the large code size. These issues can be solved by doing the initialization of the peripherals and the external hardware in the code running from the BLS itself.