Thanks genuap! this really helps.
One more question, where's u-boot source code? I think source under ..../rpm/BUILD/linux is kernel code right?
After you install the ltib, you need to go into the installation directory and configure it - run the ltib GUI:
./ltib -c
Then you can select which packages you want, what you want in the kernel etc... This'll take a while - because it has to extract all of the packages, and compiles them. When it's done, you can find the source in:
/ltib_intsll/rpm/BUILD/linux/