[etherlab-users] [etherlab-dev] Using EtherCAT EoE and Build Errors

[Matthieu Bec]

indeed, though the FAQ says

 >Supports any realtime environment through independent architecture.
 >    RTAI, Xenomai, RT-Preempt, etc.
 >    Operation possible without any realtime extension at all.

I am not sure about the second statement or how to make it work. Always 
had better luck with real-time extensions and never looked back. 
RT-Preempt is easy to setup and kind of transparent. vanilla kernel was 
giving me (if I recall correctly) similar semaphores vs. spinlocks issue 
as you pointed earlier

Matthieu


On 08/15/12 17:53, Thomas Bitsky, Jr. wrote:
> I'm not sure if this is a problem in my source code or a bug in the code
> relating to synchronization.
>
> So, my problem has become this: I can successfully use EoE when the
> EtherCAT network is not operational. I can successfully use the EtherCAT
> network in Operation if the virtual EoE interface is down, but if I put
> the EtherCAT network into Operation and use the callbacks to handle EoE,
> the entire computer locks up.
>
> For reference:
> EtherCAT version: stable-1.5
> System: Linux laptop14 2.6.32-42-generic-pae #95-Ubuntu SMP Wed Jul 25
> 16:13:09 UTC 2012 i686 GNU/Linux
> I am not using any real-time extensions.
> GCC: 4.4
>
>
> The problem could very well be in my source code, although I've matched
> it closely to the EtherLAB examples. Once the virtual EoE interface goes
> up, the kernel log is filling with the errors I mentioned before:
>
> [ 2687.384659]
> [ 2687.384665] Pid: 0, comm: swapper Tainted: P        W
>    (2.6.32-42-generic-pae #95-Ubuntu) Latitude E6510
> [ 2687.384672] EIP: 0060:[<c03ac336>] EFLAGS: 00000202 CPU: 3
> [ 2687.384680] EIP is at acpi_idle_enter_bm+0x275/0x2a4
> [ 2687.384684] EAX: c088eb4c EBX: 00000ee7 ECX: 00000000 EDX: 03036000
> [ 2687.384689] ESI: 00000000 EDI: f6e404cc EBP: f74cbf78 ESP: f74cbf50
> [ 2687.384694]  DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068
> [ 2687.384698] CR0: 8005003b CR2: b94c0004 CR3: 00799000 CR4: 000006f0
> [ 2687.384703] DR0: 00000000 DR1: 00000000 DR2: 00000000 DR3: 00000000
> [ 2687.384707] DR6: ffff0ff0 DR7: 00000400
> [ 2687.384710] Call Trace:
> [ 2687.384719]  [<c04ca54a>] cpuidle_idle_call+0x7a/0x100
> [ 2687.384727]  [<c01085a4>] cpu_idle+0x94/0xd0
> [ 2687.384735]  [<c05b31b7>] start_secondary+0xc4/0xc6
> [ 2687.393250] BUG: scheduling while atomic: swapper/0/0x10000100
> [ 2687.393256] Modules linked in: durability ec_generic ec_e1000
> ec_8139too ec_master mii michael_mic arc4 binfmt_misc snd_hda_codec_idt
>
>
> The notable parts of my code are the callback:
>
> void
> send_callback(void *cb_data)
> {
> ec_master_t *m = (ec_master_t *) cb_data;
>          down(&master_sem);
> ecrt_master_send_ext(m);
>          up(&master_sem);
> }
>
> void
> receive_callback(void *cb_data)
> {
> ec_master_t *m = (ec_master_t *) cb_data;
>          down(&master_sem);
> ecrt_master_receive(m);
>          up(&master_sem);
> }
> If they are not in the program and activated by ecrt_master_callbacks,
> then there is no lock-up. Of course, EoE doesn't work. Once I put them
> in, the system hangs in about 30 seconds or less. I can't see any
> obvious reason for this: it looks like dead lock. I added traces and
> watched the kernel log viewer; I think it's locking up in
> ecrt_master_send_ext and not returning.
>
> In any case, I've been working on this for five days. If anyone can
> shine some light on what I'm doing wrong, or how I can fix this, I'd
> appreciate it.
>
> Thanks again!
> Tom
>
>
> On Wed, Aug 15, 2012 at 1:02 PM, Matthieu Bec <mbec at gmto.org
> <mailto:mbec at gmto.org>> wrote:
>
>
>         # ifconfig eoe0s7 192.168.127.10
>         # ifconfig eoe0s7 up
>
>         Is there any way to make this happen automatically on startup? In
>         /etc/network, I created a file called ifcg-eoe0s7 and put in:
>
>         IPADDRESS=192.168.127.10/24 <http://192.168.127.10/24>
>         <http://192.168.127.10/24>
>         STARTMODE=auto
>
>         But it must not be working because the virtual interface doesn't
>         even
>         have an IP Address until I give it one manually.
>
>
>     on fedora:
>
>     # ifup eoe0s7
>
>     best consult the ubuntu forums.
>
>
>
>
> --
> Thomas C. Bitsky Jr.
> Lead Developer and Application Engineer
> ADC | automateddesign.com <http://automateddesign.com>
> P: 630-783-1150 <tel:630-783-1150> F: 630-783-1159 <tel:630-783-1159> M:
> 630-632-6679 <tel:630-632-6679>
>
>
>
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>
i

-- 
Matthieu Bec                GMTO Corp.
cell:  +1 626 354 9367      P.O. Box 90933
phone: +1 626 204 0527      Pasadena, CA 91109-0933