µracoli Manual  Version foo
Patching the FT245 Driver under Linux

This steps have to be done in order to modify the Linux kernel module ftdi_sio.ko so, that it accepts devices with the vendor/device IDs of the Atmel STK541 and/or the Dresden Elektronik Sensor Terminal Board and assigns them a serial device like /dev/ttyUSBxx.

Modify the Driver Source Code
In the directory /usr/src/linux/drivers/usb/serial/ there are the files ftdi_sio.h and ftdi_sio.c, which needs to be modified.

There are two patches available but most probably they will not work at a specific system, since in ftdi_sio.c, the line numbers change rapidly by adding new devices from other vendors. So the patches most probably needs to be applied manually.

At first, the macros for the vendor and product ID of the boards have to be added in the file ftdi_sio.h:329.

#define ATMEL_VID 0x03eb /* Atmel Vendor ID */
#define STK541_PID 0x2109 /* Zigbee Controller */
#define DE_VID 0x1cf1 /* Dresden Electronic Vendor ID */
#define STB_PID 0x0001 /* Sensor Terminal Board */

Next in the file ftdi_sio.c the new Vendor/Device ID tuples needs to be added:

static struct usb_device_id id_table_combined [] = {
{ USB_DEVICE(FTDI_VID, FTDI_AMC232_PID) },
...
...
...
{ USB_DEVICE(ATMEL_VID, STK541_PID) },
{ USB_DEVICE(DE_VID, STB_PID) },
{ }, /* Optional parameter entry */
{ } /* Terminating entry */
};
Build the Modified Kernel Modul
   root@pandora>cd /usr/src/linux
   root@pandora>make drivers/usb/serial/ftdi_sio.ko
   CC [M]  drivers/usb/serial/ftdi_sio.o
   MODPOST
   CC      drivers/usb/serial/ftdi_sio.mod.o
   LD [M]  drivers/usb/serial/ftdi_sio.ko
Note
If an error message like "You have not yet configured your kernel! (missing kernel .config file)" occurs, under SuSE Linux you can quickly recover from this issue by doing "zcat /proc/config.gz > .config" in the directory /usr/src/linux.
Install the new Kernel Modul
   root@pandora>rmmod ftdi_sio
   root@pandora>cd /lib/modules/`uname -r`/kernel/drivers/usb/serial
   root@pandora>cp ftdi_sio.ko ftdi_sio.ko.orig
   root@pandora>cp /usr/src/linux/drivers/usb/serial/ftdi_sio.ko .
   root@pandora>depmod -a
Load and Test the new Kernel Modul
   root@pandora>modprobe ftdi_sio
   root@pandora>lsmod | grep ftdi
   ftdi_sio               27400  0
   usbserial              28776  1 ftdi_sio
   usbcore               112640  5 ftdi_sio,usbserial,uhci_hcd,rt73
   root@pandora>dmesg | grep FTDI
   ftdi_sio 1-1.2:1.0: FTDI USB Serial Device converter detected
   usb 1-1.2: FTDI USB Serial Device converter now attached to ttyUSB0
   drivers/usb/serial/ftdi_sio.c: v1.4.3:USB FTDI Serial Converters Driver