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    I read this wonderful book at beginning of career around Jan 2010. I had read this, followed and does manually cross-compiled, entire Linux system. Along with http://trac.cross-lfs.org/, I was able to set up a tiny embedded Linux system. I clearly explains properly setting up root file system (rfs). Also, explains about flash file system, rt patch etc...

    This experience in building embedded Linux system, helps me to understand in depth of various subjects packages, permissions of files, and of course helps me understand various build tools such as Openembedded. This book is very much useful even now... However, I recommand you to read this book, only when you have lots of time. But better start with http://trac.cross-lfs.org/ and try to understand openembedded/yocto, which is becoming de-facto standard in building embedded linux systems.