[etherlab-users] How to prevent module unloading when starting the ethercat service on a diskless computer ?

Sebastien Blanchet blanchet at iram.fr
Tue Nov 22 08:24:47 CET 2011

I reply to myself, because I have found some informations:

According to the Ethercat master documentation 1.5.0, section 4.2 Native 
EtherCat Device Drivers, I should use ec_e100 for both ethernet and ethercat 
trafic. Therefore I will remove the e100 from the initrd and, I will put ec_e100 

On 10/28/2011 07:03 PM, Sebastien Blanchet wrote:
> Hi,
> I have just bought a EtherLab smart kit to evaluate EtherCAT, and now I would
> like to run EtherCAT master on a Linux diskless computer.
> But I have a problem when I start the ethercat service: the service unloads the
> linux driver that is required for diskless operations, and then obviously the
> computer hangs, because it cannot access to its NFS root filesystem.
> This is my question:
> Is it possible to run simultaneously e100 and ec_100, each of them on a
> different Ethernet controller ?
> How to do it ?
> More details about my configuration:
> The diskless computer is a VMIVME-7700. It is a VME single board computer with
> two Ethernet controllers intel e100.
> The computer boots with PXE. It downloads the linux kernel and the initrd with
> The computer accesses to its NFS root filesystem through eth0 (module e100)
> and I would like to run the ethercat master driver (module ec_e100) on eth1.
> I run EtherLab stable-1.5 on Linux Debian 6.0/i386 with a linux kernel
> + RTAI 3.8.1
> Should I try to built statically the e100 linux driver in the kernel ?
> Should I try to boot the computer with the ec_e100 driver ?
> Thank you very much for your help.

Sebastien BLANCHET

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