IRC log for #elinux on 20071209

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20:11.40seanpHello - can anyone help me diagnose why my module-addition to the linux kernel tree doesn't compile?
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22:40.11drewhi. I'm having trouble compiling extra modules for a running kernel in an ARM-based NAS device. I have the source from the manufacturer and tried cross-compiling but I get this on module insertion: Invalid module format (-1): Exec format error ... any ideas?
22:40.23drewfile <modulename> reports both existing and newly compiled modules as: ELF 32-bit LSB relocatable, ARM, version 1, not stripped
22:41.11drewI'm using the vendor's .config (with my additions) and patches
23:36.43seanpHello drew - are you there?
23:36.53drewyep
23:37.22drewI think I worked it out: <3>snd_usb_audio: version magic '2.6.17.14 preempt mod_unload ARMv5 gcc-3.4' should be '2.6.17.14 preempt mod_unload ARMv5 gcc-4.1' the build environment supplied is actually wrong!
23:37.48drewI'm trying a rebuild with gcc 4.1.0 (ring strings a module turn up GCC: (GNU) 4.1.0)
23:37.51seanpI can't help you with your problem - can you help me with some general module issues in buildroot/linux compile?
23:38.40drewprobably not - this is my first time using buildroot and my first non x86 arch
23:38.48drewbut try me
23:39.30drewI'm pretty handy with google ;)
23:39.42seanpwell mine too - I'm trying to add a module to the linux tree - but it doesn';t get compiled by the build - can I perhaps tell you what my process is and then tell me if I'm doing something stupid?
23:39.58drewok
23:41.38seanpWell, based on other modules that came w/ packages, I've create a patch that #1 adds my hello-world module c-code to the tree, specifically under <linux>/drivers/char (we eventually want to port a driver to go here) and #2 edits the driver/char/Makefile to include "obj-m+=hello_world.o" Makefile
23:42.58seanpBut when it runs, it doesn't get built. I've tried forcing build by doing such things as removing ".-files" (i.e. .modbuilt) and otherwise trying to force recompile - I haven't gone so far as to remove other .ko files to see what would happen. By convention, is this the proper starting point for adding a module to the kernel tree?
23:44.28seanpI can build the kernel fine, adding apps in my own package, etc.
23:45.26seanpP.S. the documentation has been very absent on adding modules/device drivers - I've pounded google over the last week. kernelnewbies has bee very hostile to my queries...
23:49.13drewtried these?
23:49.15drewhttp://www.cyberciti.biz/tips/build-linux-kernel-module-against-installed-kernel-source-tree.html
23:49.23drewhttp://www.cyberciti.biz/tips/compiling-linux-kernel-module.html

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