PS. I recommend cloning the entire u-boot repository from here:
http://arago-project.org/git/projects/?p=u-boot-am33x.git;a=summary
You'll be able to see commit history much easier that way, e.g. you can do "git log" to see the history of the whole tree or "git log <filename>" to see the history for a specific file. You can do that from the web site too but I think it's a bit easier when it's local. There are tags such as v2011.09_AM335xPSP_04.06.00.02 - v2011.09_AM335xPSP_04.06.00.08. Those tags make it easy to compare differences between versions, etc. by doing things like git log tag1..tag2.