[U-Boot] U-BOOT

Greetings,

I am working as an R&D Engineer. presently i am using u-boot ver 2008.10 and wanted to shift to latest version. I had downloaded 2011.06 from DENX website. when i tried to compile it its bit different and i am facing problems. where can i get document of change log or any other document which can help in my compilation. IS there any problem, if i use new u-boot version with older kernel like 2.6.28 or 2.6.32 versions. please help me in this regard. Thanks in advance.