The try with serial console did detect both SCSI devices fine but failed to mount CD. Digging around showed that iso 9660 filesystem was not available in /proc/filesystems and could not be modprobed either.The isofs module should be available in the initrd. Is it not?
No. It is only present for sparc64 but missing for sparc32 (again with 17. Oct netinst image, todays not tried).
-- Meelis Roos (email@example.com)