Hi all,
as I wasn't able to find on the Web an existing crosstool-ng configuration to use to build a toolchain for my Kindle 4 NT, I decided to share mine: it recommends gcc 4.5.4 Linaro (since /proc/version says 4.5.3 Linaro), eglibc 2.12 (as per Amazon sources), plus the original kernel sources (again, from Amazon) and the latest non-experimental binutils (I don't think this really matters).
Here you can find the configuration, and
here a little post on my blog describing it (nothing new, I think, for this community
); you have to adjust the paths for the output directory and the kernel sources, of course.
If this information was already somewhere in the forum, sorry for the duplicate