I already have /mnt/cdrom.
I issued the ff:

# mount /dev/sonycd535 /mnt/cdrom
error message:
Did not find a Sony CDU-535 drive
mount: the kernel does not recognize /dev/sonycd535 as a
block device (maybe `insmod driver'?)

Do I need to config other things like:

kernel command line of the form:

sonycd535=

where is the base address of the controller (e.g. 0x320). Alternatively you can set the address in the file sonycd535.h and compile it in.