Have you had some other error before ..while bitbake or something related? Which OS are you using? Other users have problems working in some OS.
Let me know about this and I'm going to research about your issue.
I am using ubuntu 12.04. No this libarchive package was the first error. I tried doing a clean no effect.
Sorry If I misunderstood the question. This is first time I am trying to compile the BSP.
I downloaded the tar again for a fresh compile.
This time too it gave me a checksum warning. But the compilation went through.
Yes its working. Had to do a fresh download.
Not sure what the issue was.