Re: mxc_v4l2_capture sometimes not being modprobed

[Eric Nelson <eric.nelson@boundarydevices.com>]

Hi John,

On 06/09/2014 10:59 AM, John Weber wrote:
> Hi Eric,
> 
> On 6/9/14, 12:49 PM, Eric Nelson wrote:
>> Hi John,
>>
>> On 06/09/2014 10:35 AM, John Weber wrote:
>>> Hi Eric,
>>>
>>> On 6/9/14, 12:16 PM, Eric Nelson wrote:
>>>> Hi all,
>>>>
>>>> On 06/09/2014 06:52 AM, Otavio Salvador wrote:
>>>>> On Mon, Jun 9, 2014 at 10:51 AM, Otavio Salvador
>>>>> <otavio@ossystems.com.br> wrote:
>>>>>> On Sun, Jun 8, 2014 at 12:51 PM, John Weber <rjohnweber@gmail.com>
>>>>>> wrote:
>>>>>>> On 6/6/14, 6:10 PM, Eric Nelson wrote:
>>>>>>>> On 06/05/2014 01:33 PM, Eric Nelson wrote:
>>>>>>>>> On 06/05/2014 01:30 PM, John Weber wrote:
>>>>>>>>>> <snip>
>>>>>>>>>>
>>>>>>>>>> I think you're right, but as far as I know the only other entity
>>>>>>>>>> that
>>>>>>>>>> could confirm this would be Boundary Devices.  Eric - do you see
>>>>>>>>>> this
>>>>>>>>>> same issue when connecting your camera to Nitrogen6x?
>>>>>>>>>>
>>>>>>>>> I've kinda followed this thread, but I'm kinda buried and it will
>>>>>>>>> take
>>>>>>>>> a day or two for me to confirm or deny this.
>>>>>>>>>
>>>>>>>> I just tested across a dozen assorted reboots/resets/power-cycles
>>>>>>>> and didn't see the issue with an OV5642 parallel camera and
>>>>>>>> 3.10.17.
>>>>>>>>
>>>>>>>> I **don't** have udev-cache configured.
>>>>>>> I suspect that we will need to disable it on Wandboard as well.
>>>>>> This is not a good fix.
>>>>>>
>>>>>> I added a patch, for OE-Core/Poky, attached; please confirm it fixes
>>>>>> it.
>>>> I just tested again on an image with udev-cache, and don't see any
>>>> issues on a Nitrogen6x board (CSI camera).
>>>>
>>>> I'm not sure what's different about my environment.
>>>>
>>>> Regards,
>>>>
>>>>
>>>> Eric
>>>>
>>> Not sure either, but are you testing with the parallel CSI or MIPI CSI
>>> camera?  Could there be a difference in the how the drivers are loaded?
>>>
>> I tested using parallel CSI.
>>
>> AFAIK, the driver load process is the same for both.
>>
>> Regards,
>>
>>
>> Eric
> OK.  I don't think our environments are very different, so I suspect
> that it might be one of the few kernel enhancements that you've made.
> 
> BTW - did you disable udev-cache by default?  If so where did you do
> this in Yocto?
> 

This was purely un-intentional. I think I was working with a build that
started with core-image-minimal.

Regards,


Eric