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To: linux-media@vger.kernel.org
From: drbob <drbob@gmx.co.uk>
Subject: EC168 "dvb_usb: Unknown symbol release_firmware"
Date: Mon, 4 May 2009 20:28:24 +0000 (UTC)
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Hello,

I recently tried to build and use the EC168 drivers from 
<http://linuxtv.org/hg/~anttip/ec168/>
following instructions found at
<http://www.dealextreme.com/forums/Default.dx/sku.8325~threadid.278942>

The drivers built fine but upon trying to load dvb-usb.ko 
(sudo insmod ./dvb-usb.ko) I got the following error:

  insmod: error inserting './dvb-usb.ko': -1 Unknown symbol in module

dmesg listed these additonal errors:

  [  647.189929] dvb_usb: Unknown symbol release_firmware
  [  647.190085] dvb_usb: Unknown symbol request_firmware

I am running Debian 5.0 with the stock kernel (2.6.26-2-amd64) on an HP 
ML115 server (Quad-Core AMD Opteron(tm) Processor 1352, 4GB ECC memory)

I found I was able to work around the issue like so: 

1. First load and then unload the stock dvb-core and dvb-usb included 
with lenny.

  sudo modprobe dvb-core
  sudo modprobe dvb-usb
  sudo rmmod dvb-core
  sudo rmmod dvb-usb
 
2. Then load the modules built from the EC168 tree. 

  sudo insmod ./dvb-core.ko
  sudo insmod ./dvb-usb.ko
  sudo insmod ./ec100.ko
  sudo insmod ./mxl5005s.ko
  sudo insmod ./dvb-usb-ec168.ko

The stick then works and I can use it to view tv etc, unplug/reinsert it 
and unload/reload the EC168 tree modules without carrying out step 1 
again (until the next reboot). 

The stick is a cheap generic USB stick purchased from eBay (USB id 
18b4:1001). Photos of it are here:

<http://img89.imageshack.us/gal.php?g=img1283g.jpg>

Strangely the markings on the large main chip appear to have been removed 
by the stick manufacturer (though I think it must be an EC168) The 
smaller tuner chip has also been scrubbed but the following markings can 
still be identified:

Maxline MXL5003 
D37T5:1

Thanks for your time.