couldn't initialize doc2000

[nur]

I compiled kernel 2.2.18-rtl3.0 with m-systems mtd support
I followed all instructions in doc-linux README
./mkinitrd_doc is ok
doc-lilo -v -C /etc/lilo.conf-initrd is ok
shutdown -r now
no message related to diskonchip is displayed during boot
i tried "insmod doc"
then i receive this message
Using /lib/modules/2.2.18-rtl3.0-doc2000/block/doc.o
Cannot initialize M-Systems DOC 2000 OSAK
/lib/modules/2.2.18-rtl3.0-doc2000/block/doc.o: init_module: Device or
resource busy

I have 8 mb DOC 2000. What might be my problem? Thanks