Hi Ashwin,
Look at the contents of the QorIQ SDK V1.9 source ISO, and you will see in the root the SDK manual: QorIQ-SDK-1.9-IC-RevA.pdf. There is also a directory titled sdk_documentation that contains many other documents including the yocto project docs.
Keep in mind that the SDK utilizes the Yocto Project as its foundation for building the Linux distribution. Therefore, you may want to join the project's mailing lists and look at its Wiki in addition to the official docs: yoctoproject.org
Good luck,
Bob