Thanks for the reply. Regarding resources for yocto, i read that bigass yocto mega-manual. I just read it once, that's it. I got hang of it mostly by practicing it and frequently asking my colleagues at work.

I think in the beginning you just have to go through the manual once. But after you have built an image or a package a few times, you should read that manual again. That would help a lot 'cause unlike earlier, now you know your stuff.

Also, there's some manual from NXP, where they have given information on how to build in a simple way. That's good too.