Thanks to great instruction pages, I have finally been able to boot my Beagle Board using images from Koen's Demo pages
http://www.angstrom-distribution.org/demo/beagleboard/
For the rootfs, I'm using the latest build available:
Angstrom-Beagleboard-demo-image-glibc-ipk-2008.1-test-20080920-beagleboard.rootfs.tar.bz2 <http://www.angstrom-distribution.org/demo/beagleboard/Angstrom-Beagleboard-demo-image-glibc-ipk-2008.1-test-20080920-beagleboard.rootfs.tar.bz2>
After login as root: I have a promt :