Query related to PRU drivers of BeagleBone Black

[Utkarsh Rai]

Thank you for the clarification.

On Mon, Dec 16, 2019 at 6:31 PM Nils Hölscher <nilhoel1 at gmail.com> wrote:

> Hi,
>
>
> On Sun, 15 Dec 2019 at 15:45, Christian Mauderer <list at c-mauderer.de>
> wrote:
>
>> Hello Utkarsh Rai,
>>
>> I haven't followed the project tightly. So I can't tell much regarding 2
>> and 3. I added Nils (who did the GSoC 2019 project) to CC so maybe he
>> can give you some more details.
>>
>> Regarding 1: In RTEMS we generally prefer the FreeBSD code due to the
>> BSD license. Most code in Linux is GPL code. Also it's a great license
>> for desktop applications it would make a lot of problems in the typical
>> RTEMS use cases. RTEMS applications are (nearly) always statically
>> linked with the system into a single binary. Therefore GPL would spread
>> into the application code too. In some cases that is no problem but
>> there are use cases where the user don't want or is not allowed to open
>> the application due to various reasons. Think of automotive or space
>> applications. They sometimes have quite tough regulations.
>>
>> Another reason: We have a well working infrastructure to import FreeBSD
>> code called rtems-libbsd. So importing from FreeBSD is a lot simpler
>> then importing from Linux.
>>
>> Best regards
>>
>> Christian
>>
>> On 14/12/2019 19:44, Utkarsh Rai wrote:
>> > Hello everyone,
>> > I am interested in contributing to the PRU drivers of the BeagleBone
>> > Black BSP. I have briefly overviewed the work that has been done
>> > <https://github.com/nilhoel1/rtems-pru>on the PRU drivers. I have few
>> > queries regarding the same-
>> > 1. Instead of using Linux based UIO drivers, FreeBSD based drivers have
>> > been used. Is there an advantage/specific-feature that FreeBSD drivers
>> > have over Linux ones for this choice?
>> > 2. What all are the driver features that have still not been
>> > developed/debugged/tested?
>>
> In the application I used for testing, mmap would alway fail.
> So I wasn't able to test all functionality of the PRU drivers.
>
>> > 3. How should I proceed to test the driver features on the BeagleBone
>> Black?
>>
> The best approach would be to test the drivers with a new written
> application, since I don't think that the mmap problems are PRU driver
> related.
>
> Please read my blog <https://nilshoel.home.blog/> for more Information on
> this topic.
> And please feel free to mail me any time.
>
> Best regards,
> Nils Hölscher
>
>> > I would be very grateful if I could get a few indicators on the
>> > above-mentioned queries.
>> >
>> > Thank you, Regards.
>> >
>> > _______________________________________________
>> > devel mailing list
>> > devel at rtems.org
>> > http://lists.rtems.org/mailman/listinfo/devel
>> >
>>
>
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