Dear Sridhar Addagada,
In message 1322545120.45725.YahooMailNeo@web120206.mail.ne1.yahoo.com you wrote:
Here is a scenario, i have a working version of the u-boot on my board, and am trying my changes. Am not sure it is going to freeze the board, so would like the present version to load the new version for testing before it can be burned to flash. Is it possible to do this or is it already done?
In the strict sense, this usually cannot be done - one of the most critical parts (that most oftenly is incorrect and thus bricks your system) is the low-level initialization, like initializing the memory controller. And you usually cannot re-do this while already running from RAM.
Note that this is covered in the FAQ: http://www.denx.de/wiki/view/DULG/CanUBootBeConfiguredSuchThatItCanBeStarted...
Best regards,
Wolfgang Denk