Bootloader fails to create initrd image

Hi, Is it possible to tell autoyast not to create "initrd" image during installation? I'm trying network install of SLES8 with my own kernel rpm in it. The filesystem used is ext3 and it is built into the kernel image. When Yast configures boot loader, it tries to create initrd image and looks for ext3 and jbd modules - they are not found as they are inbuilt into kernel. And so the mk_initrd fails. Grub is not configured properly. System comes up, but doesn't boot next time. Tried using in the control file, that didn't work. Thanks, Sasi