hi, i am working on the uart boot loaders for this controller lm4f232h5qd ....but not working these code plz help me?

hi,

i have same codes for boot loaders,(boot _serial,boot_demo1,boot_demo2)..initially i am flash the boot_serial program and then the flash the boot_demo1 but..these was not working...plz give some directions for me..what is the steps for uart boot loders...concept