USB to Serial Profilic PL2303

Hi,
im trying to use a USB to Serial device (Profilic PL2303). And i have installed some serial module but i can't find the PL2303 driver for
the ReadyNas Duo (Kernel 2.6.17).

Have anyone done this?

if i do

lsusb

i get this:

Bus 003 Device 001: ID 0000:0000
Bus 002 Device 007: ID 067b:2303 Prolific Technology, Inc. PL2303 Serial Port
Bus 002 Device 006: ID 04a9:1300 Canon, Inc.
Bus 002 Device 005: ID 04a9:1035 Canon, Inc.
Bus 002 Device 004: ID 04a9:107c Canon, Inc.
Bus 002 Device 003: ID 04a9:1005 Canon, Inc.
Bus 002 Device 001: ID 0000:0000
Bus 001 Device 001: ID 0000:0000

I have created a folder called "Serial" here : /lib/modules/2.6.17.8ReadyNAS/kernel/drivers/usb/serial
and added : usbserial.ko and ftdi_sio.ko modules and done

insmod

on them and that works. But i don't get the "ttyusb0" connection and it's here i need the pl2303.ko driver, i guess.

dmesg

A cutout of the result:

usb 2-1: new full speed USB device using uhci_hcd and address 7
usb 2-1: configuration #1 chosen from 1 choice
Device not ready. Make sure there is a disc in the drive.
Device not ready. Make sure there is a disc in the drive.
drivers/usb/serial/usb-serial.c: USB Serial support registered for FTDI USB Serial Device
usbcore: registered new driver ftdi_sio
drivers/usb/serial/ftdi_sio.c: v1.4.3:USB FTDI Serial Converters Driver
LPCH_ACTIVE still on: 10
2req = 1 81fa7bb0,00000000,00000000,00000000 1
LPCH_ACTIVE still on: 10
2req = 1 81fa7bb0,00000000,00000000,00000000 1
LPCH_ACTIVE still on: 10
2req = 1 81fa7bb0,00000000,00000000,00000000 1
LPCH_ACTIVE still on: 10
2req = 1 81fa7bb0,00000000,00000000,00000000 1
LPCH_ACTIVE still on: 10
2req = 1 81fa7bb0,00000000,00000000,00000000 1
LPCH_ACTIVE still on: 10
2req = 1 81fa7bb0,00000000,00000000,00000000 1
LPCH_ACTIVE still on: 10
2req = 1 81fa7bb0,00000000,00000000,00000000 1
LPCH_ACTIVE still on: 10
2req = 1 81fa7bb0,00000000,00000000,00000000 1
LPCH_ACTIVE still on: 10
2req = 1 81fa7bb0,00000000,00000000,00000000 1
LPCH_ACTIVE still on: 10
2req = 1 81fa7bb0,00000000,00000000,00000000 1
LPCH_ACTIVE still on: 10
2req = 1 81fa7bb0,00000000,00000000,00000000 1
LPCH_ACTIVE still on: 10
2req = 1 81fa7bb0,00000000,00000000,00000000 1
LPCH_ACTIVE still on: 10
2req = 1 81fa7bb0,00000000,00000000,00000000 1
LPCH_ACTIVE still on: 10
2req = 1 81fa7bb0,00000000,00000000,00000000 1
LPCH_ACTIVE still on: 10
2req = 1 81fa7bb0,00000000,00000000,00000000 1
LPCH_ACTIVE still on: 10
2req = 1 81fa7bb0,00000000,00000000,00000000 1
chn=0, statu/LP_S=0x(d0/d050)29, 32
Device not ready. Make sure there is a disc in the drive.
Device not ready. Make sure there is a disc in the drive.

I hope someone else have done this, and can guide me to the correct direction.

Br Stefan / Nots