Where to find Angstrom demo image's kernel(2.6.32) source files

As I have mentioned in my previous discussion(http://groups.google.com/
group/beagleboard/browse_thread/thread/8c158ee281971618), I have a LCD
TV problem
I plan to compile ubuntu kernel with omap source files from Angstrom
kernel. Where can I find kernel source files of Angstrom demo image?