since we build our custom-CD's (SLES8) with SP3, there will be no kernel installed by autoyast. As a result, all modules are missing, and /boot is almost empty, no boot-image or initrd in there. So the network interfaces don't work and the reboot fails because of the missing vmlinuz.
We use a machine with two processors and therefore we need an smp-kernel installed which worked fine BEFORE we put the SP3-Packages into the repository. The needed kernel was detected and installed automatically.