Re: [Xenomai] RT serial cross-link failure

[Jan Kiszka <jan.kiszka@siemens.com>]

On 2016-02-22 18:53, Michael Welling wrote:
> On Thu, Feb 18, 2016 at 10:10:48AM -0600, Michael Welling wrote:
>> On Thu, Feb 18, 2016 at 08:30:40AM +0100, Wolfgang Netbal wrote:
>>>
>>>
>>> Am 2016-02-18 um 08:10 schrieb Michael Welling:
>>>> On Thu, Feb 18, 2016 at 08:02:48AM +0100, Wolfgang Netbal wrote:
>>>>>
>>>>> Am 2016-02-16 um 18:58 schrieb Michael Welling:
>>>>>> On Tue, Feb 16, 2016 at 06:39:50AM +0100, Wolfgang Netbal wrote:
>>>>>>> Am 2016-02-15 um 18:41 schrieb Michael Welling:
>>>>>>>> I took the time to update the IMX UART driver such that it registers with the 3.18 kernel.
>>>>>>>>
>>>>>>>> The driver appears to register correctly and the /dev/rtdm/rtser* nodes appear.
>>>>>>>>
>>>>>>>> When I run the cross-link demo the system hangs after an error in read_task.
>>>>>>>>
>>>>>>>> Here is the output that I get:
>>>>>>>> main : write-file opened
>>>>>>>> main : write-config written
>>>>>>>> main : read-file opened
>>>>>>>> main : read-config written
>>>>>>>> main : write-task created
>>>>>>>> main : read-task created
>>>>>>>> main : starting write-task
>>>>>>>> main : strating read-task
>>>>>>>>  Nr |   write-irq    |    irq->read    |   write->read   |
>>>>>>>> ----------------------------------------------------------
>>>>>>>> read_task: error on RTSER_RTIOC_WAIT_EVENT, Operation no permitted
>>>>>>>> main : /dev/rtdm/rtser1 (read) -> closed
>>>>>>>> read_task: exit
>>>>>>>>
>>>>>>>> Any ideas why this would happen?
>>>>>>>>
>>>>>>>> I can provide the patch for the driver if necessary. I tried to keep the changes to a minimal.
>>>>>>> Dear Michael,
>>>>>>>
>>>>>>> I added a patch on December where I extended the IMX UART driver to support
>>>>>>> open firmware, maybe my patch can help you to find your issue.
>>>>>>> I posted the patch in the mailing list, you can find it here
>>>>>>> https://xenomai.org/pipermail/xenomai/2015-December/035655.html
>>>>>>>
>>>>>>> Kind regards
>>>>>>> Wolfgang
>>>>> Sorry Michael,
>>>>>
>>>>> My patch working for xenomai 2.6.4 file ksrc/drivers/serial/rt_imx_uart.c
>>>> I am pretty sure that there is another patch applied previous.
>>>>
>>>> If you look at your patch you see German comments and open firmware code that
>>>> is obviously not in the v2.6.4 on the git repository.
>>>>
>>>> https://git.xenomai.org/xenomai-2.6.git/tree/ksrc/drivers/serial/rt_imx_uart.c?h=v2.6.4
>>>>
>>> I posted my patch, because I thought that Wolfgang Grandegger the author of
>>> the driver may check it and include it to the xenomai if it is useable for
>>> other users.
>>>
>>
>> Yes but the patch does not apply to the driver in the source tree.
>> Please provide the driver that you have after the patch.
> 
> Any ideas out there?
> 

Are you now referring to the incomplete patch or your original problem
again?

For the latter case, I would recommend debugging the error code, ie.
what threw this at you. In Xenomai context, -EPERM often means that the
caller is requesting some (potentially) blocking service without being a
real-time task. But, of course, also the driver itself may decide to
raise this for whatever reasons.

Jan

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