ide-scsi emulation freezes system

Ide-scsi emulation has worked til kernel-2.4.7-pre3. With any newer kernel (I tried 2.4.10/2.4.12/2.4.16), mounting my ide-cdrom freezes the whole system. This must be ppc specific. My i386 system is working fine with 2.4.16. PPC platform is b&w g3. Has anyone on the list the same problem? Grüßli, Micha