Problems installing with USB CDROM

I'm trying to install Crux on an IBM Thinkpad. This notebook has a USB CDROM and no floppy drive. The Crux CD-ROM boots, but the kernel apparently doesn't support USB and therefore can't see the CDROM drive afterwards. What I did so far is: 1. Build a kernel with compiled-in USB (-CDROM) support. 2. Make a bootable CDROM (using mkbootfloppy), consisting of the original Crux CDROM, with the kernel replaced by the new one. Now I would expect the boot parameters "root=/dev/sr0" or "root=/dev/scd0" to work, but I still get the message "Cannot open root device XXX" and a kernel panic. Something appears to be missing. Can anybody help? Regards, Bernd -- Bernd Eggink monoped@arcor.de