[etherlab-users] Error loading generic module on kernel 3.2.0 withRT-Preempt

hamelin.philippe at ireq.ca hamelin.philippe at ireq.ca
Wed Jun 27 20:46:43 CEST 2012

Finally, the problem was in the debian package coming from the PPA which was referencing 'standard' headers instead of patched headers. I manually patched and built the kernel and everything works fine.


De : etherlab-users-bounces at etherlab.org [mailto:etherlab-users-bounces at etherlab.org] De la part de hamelin.philippe at ireq.ca
Envoyé : 27 juin 2012 11:53
À : etherlab-users at etherlab.org
Objet : [etherlab-users] Error loading generic module on kernel 3.2.0 withRT-Preempt

I'm trying to use the IgH EtherCAT Master on Ubuntu 12.04. I'm using the 3.2.0 kernel with RT-Preempt patches from this PPA: https://launchpad.net/~abogani/+archive/realtime <https://launchpad.net/~abogani/+archive/realtime> . During compilation of the kernel modules, I get the following warnings:
  Building modules, stage 2.
  MODPOST 3 modules
WARNING: "ecrt_slave_config_state" [/home/hamelinp/devroot/ethercat-1.5.1-rt/examples/mini/ec_mini.ko] undefined!
WARNING: "ecrt_slave_config_pdos" [/home/hamelinp/devroot/ethercat-1.5.1-rt/examples/mini/ec_mini.ko] undefined!
WARNING: "_raw_read_lock" [/home/hamelinp/devroot/ethercat-1.5.1-rt/devices/ec_generic.ko] undefined!
WARNING: "_raw_read_unlock" [/home/hamelinp/devroot/ethercat-1.5.1-rt/devices/ec_generic.ko] undefined!
  CC      /home/hamelinp/devroot/ethercat-1.5.1-rt/devices/ec_generic.mod.o
  LD [M]  /home/hamelinp/devroot/ethercat-1.5.1-rt/devices/ec_generic.ko
  CC      /home/hamelinp/devroot/ethercat-1.5.1-rt/examples/mini/ec_mini.mod.o
  LD [M]  /home/hamelinp/devroot/ethercat-1.5.1-rt/examples/mini/ec_mini.ko
  CC      /home/hamelinp/devroot/ethercat-1.5.1-rt/master/ec_master.mod.o
  LD [M]  /home/hamelinp/devroot/ethercat-1.5.1-rt/master/ec_master.ko
Indeed, when trying to load the module I get this error:
FATAL: Error inserting ec_generic (/lib/modules/3.2.0-23-realtime-pae/ethercat/devices/ec_generic.ko): Unknown symbol in module, or unknown parameter (see dmesg)
and in dmesg:
[ 2487.244002] EtherCAT: Master driver 1.5.1 0f7a243b03e4
[ 2487.244013] EtherCAT: 0 masters waiting for devices.
[ 2487.244114] ec_generic: Unknown symbol _raw_read_unlock (err 0)
[ 2487.244122] ec_generic: Unknown symbol _raw_read_lock (err 0)

Using this command:
cat /proc/kallsyms | grep raw_read_unlock
I can confirm that these symbols are not available. However, I have a 'rt_read_unlock' available in the symbols table.
Any hint?
Thank you,
Philippe Hamelin, ing., M. Ing
Chercheur / Researcher

T: 450-652-8499 x2198
F: 450-652-1316

Expertise robotique et civil
Institut de recherche d'Hydro-Québec (IREQ)
1740, boul. Lionel-Boulet
Varennes (QC) J3X 1S1, Canada

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