I found this query on linux-kernel. Can anyone help George? ---------- Forwarded message ---------- From: George Nychis <gnychis@cmu.edu> Date: Sun, Feb 27, 2011 at 5:26 PM Subject: help with unknown symbols when trying to load kernel module To: linux-kernel@vger.kernel.org Hi all, Long story short, I am trying to rebuild a kernel module for my android phone.  Unfortunately, Motorola did not post the kernel configuration they used (https://opensource.motorola.com/sf/sfmain/do/viewProject/projects.droid - I am running 2.2.1).  They also did not configure the kernel to dump it at /proc/config.gz. I have the exact source code used to build both the kernel, and the wireless kernel module used.  But again, I do not have the exact kernel configuration.  Therefore, I do not want to replace the kernel on the phone (in fear of misconfiguration causing boot errors), I simply want to rebuild the wireless module and get it to work with the kernel already on the phone. I've tried getting help from the android community, however their kernel mailing list only gets about 3 messages a day and posts are moderated and lag behind something like 4 days.  So, I'm hoping for a little bit of help here on the linux end of things from the linux community. I've ballparked the configuration using an older configuration file posted on another forum, and was able to successfully build my own kernel (albeit I do not use it), and then also build the wireless module successfully. When I try to load the module on the phone, I get a pretty long list of undefined symbols: http://pastebin.com/re5mRj4E I decided to start by focusing on one of these errors, 'register_netdev' and used 'nm' on my kernel module and found that it is undefined: 00073b60 T regReadLastDbgState         U register_netdev 000345ec T regulatoryDomain_SetDefaults Here is the entire nm output: http://pastebin.com/8kTDKF87 I'm a little confused as to what this means.  Does this mean that the stock kernel on the phone does not have this symbol?  It seems odd since I believe the wireless module requires it. Or does it mean something else? Thanks for any help.  I'm also not registered on the mailing list, so if you could CC me on any responses I would sincerely appreciate it. - George -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at  http://vger.kernel.org/majordomo-info.html Please read the FAQ at  http://www.tux.org/lkml/