Flashing uboot image from existing uboot prompt

Many a times, while playing around with u-boot, you will face a need to change its source code, compile it and reflash it on your board. For raw board (means when there is nothing on the board and your doing it for the first time) you may deploy different methods like JTAG, Serial Flasher, etc. But suppose you already have and existing u-boot image in your flash or RAM than bringing in a new image to your RAM and falshing it to the derisred flahs, NAND or NOR, is easy enough, thanks to the various commands provided by u-boot.

Getting help on u-boot command usage

     To many, U-BOOT is just a secondary bootloader, a means of loading kernel and handing over the execution to it.