I _know_ I saw something about this just recently, but can't find it.
   
   I've just loaded the Jan08 sparc snapshot on a sparc2 as a step
   towards tracking -current again. 
   
   The new version supports st, but when I try:
   
   	mount -t cd9660 -o ro /dev/cd0a /mnt

   [ ... ]

you need a real -current for things to work.  the support for cdrom's
was sorta broken originally, but i'm told it's fixed now.  i keep
forgetting to steal a cdrom from work for a day or two to try it out..

you also need

   options CD9660

in the kernel config file.

.mrg.