1. Remove the ugen driver from the system, if it was already installed. If in doubt, run the following command anyway:

   % rem_drv ugen 
   Driver (ugen) not installed.

2. Plug-in the camera to the system; and then run prtconf -v command, to find the device ID for the attached digital camera.

   % prtconf -v
                               ....   
               device (driver not attached)
                   Hardware properties:
                       name='usb-product-name' type=string items=1
                           value='Sony PTP'
                       name='usb-vendor-name' type=string items=1
                           value='Sony'
                               ....
                               ....
                       name='compatible' type=string items=8
                           value='usb54c,4e.150' + 'usb54c,4e' + 'usbif54c,class6.1.1' + 
                                 'usbif54c,class6.1' + 'usbif54c,class6' + 'usbif,class6.1.1' + 
                                 'usbif,class6.1' + 'usbif,class6'  name='reg' type=int items=1
                           value=00000001
                               ....

3. Add the driver alias (usb54c,4e.150 in this example. 054c is the vendor-id for Sony corporation, and 004e is the product-id for DSC-xxx (PTP)) with add_drv command, if this is the first device to be bound to ugen. Run add_drv command, as root.

   % add_drv -m '* 0666 root sys' -i '"usb54c,4e.150"' ugen

   Refer to the man page of add_drv for information about -m, -i flags and use of double quotes in specifying a driver alias that contains numbers.
   
   Note:
   If add_drv command throws an error saying ("usb54c,4e.150") already in use as a driver or alias, that means another device is already bound to ugen. So, to bind the new device to ugen, run update_drv command, as root.

   % update_drv -a -m '* 0666 root sys' -i '"usb54c,4e.150"' ugen

   If update_drv still complains about the driver or alias in use, try to remove the driver and add it again, as explained above
   
4. Bind this device (digital camera) to ugen by default that have no driver

   % echo "ugen-default-binding=\"usb54c,4e.150\";" >> /kernel/drv/uhci.conf
   % echo "ugen-default-binding=\"usb54c,4e.150\";" >> /kernel/drv/ehci.conf
   % echo "ugen-default-binding=\"usb54c,4e.150\";" >> /kernel/drv/ohci.conf

   
   
5. Check /etc/driver_aliases and make sure that the correct compatible name is in /etc/driver_aliases

   % grep ugen /etc/driver_aliases
   ugen "usb54c,4e.150"

6. Reboot the machine (only for the very first time)
   
7. Plug-in the camera and use prtconf -D to check if ugen has been bound to the device

   % prtconf -D | grep ugen
               device, instance #1 (driver name: ugen)

% gphoto2 --auto-detect
Model                          Port                                            
----------------------------------------------------------
Sony DSC-F707V (PTP mode)      usb:

• gphoto2 --help, shows all options of gphoto2
  
• gphoto2 -P, downloads all the pictures from the digital camera to the current directory
  
• gtkam is also available under /usr/sfw/bin directory, by default