Ipipe-Patch for kernel version 5.4.23

Ralf Moder ralf.moder at hbkworld.com
Thu Mar 5 10:50:33 CET 2020


Am 03.03.20 um 15:48 schrieb Jan Kiszka:
> On 03.03.20 15:23, Ralf Moder wrote:
>> Am 03.03.20 um 14:53 schrieb Greg Gallagher:
>>>
>>>
>>> On Tue, Mar 3, 2020 at 8:46 AM Ralf Moder <ralf.moder at hbkworld.com
>>> <mailto:ralf.moder at hbkworld.com>> wrote:
>>>
>>>     Am 02.03.20 um 17:01 schrieb Jan Kiszka:
>>>     > On 02.03.20 16:17, Greg Gallagher wrote:
>>>     >>
>>>     >> On Mon, Mar 2, 2020 at 7:38 AM Jan Kiszka via Xenomai
>>>     >> <xenomai at xenomai.org <mailto:xenomai at xenomai.org>
>>>     <mailto:xenomai at xenomai.org <mailto:xenomai at xenomai.org>>> wrote:
>>>     >>
>>>     >>     On 02.03.20 11:00, Ralf Moder via Xenomai wrote:
>>>     >>      > Hello everyone,
>>>     >>      > I need the kernel version 5.4.23 in an embedded linux
>>>     project
>>>     >>     because of driver stuff but also the Xenomai extension. How
>>>     big is
>>>     >>     the probability that an I-pipe patch for the 5.4 version
>>>     will be
>>>     >>     released in the next 2 to 3 months?
>>>     >>
>>>     >>     I would first of all say that it's >0. But beyond that, it
>>>     >> depends on
>>>     >>     the architecture: x86 should be available on 5.4 in the
>>>     next months
>>>     >>     with
>>>     >>     a probability >>50% as that will be my primary target for
>>>     looking
>>>     >> into
>>>     >>     how to move forward. ARM and ARM64 currently lacks a
>>>     maintainer.
>>>     >> If we
>>>     >>     are lucky, the base enabling via Philippe's dovetail
>>> queue will
>>>     >> enable
>>>     >>     those more or less as well. But it will definitely take
>>> someone
>>>     >> to take
>>>     >>     responsibility for those archs because my colleagues and I
>>>     currently
>>>     >>     cannot invest beyond integrating contributions. There is
>>>     also ppc32
>>>     >>     (which has a maintainer), but I suppose that this is not
>>> your
>>>     >> target.
>>>     >>
>>>     >>     Jan
>>>     >>
>>>     >>     --     Siemens AG, Corporate Technology, CT RDA IOT SES-DE
>>>     >>     Corporate Competence Center Embedded Linux
>>>     >>
>>>     >> If you need this for arm I was going to try to port the ipipe
>>>     to 5.4
>>>     >> in the near future. Effort wise it shouldn't be too bad, but
>>> it all
>>>     >> depends on how much the upstream changes impact us.  What
>>> board are
>>>     >> you targeting?
>>>     it is a SoC from xilinx with 2 arm cortex a53 kernel on it
>>>
>>> This is an ultrascale? I’ve run the current ipipe code (4.19) on the
>>> ultra96 without issue.
>>
>> You are right. It is a Xilinx UltraScale+ ZU2CG.  For some reasons we
>> need the 5.4 kernel version on this board.
>
> In the CIP project, Cybertrust is currently working on a mainline
> backport of UltraScale patches to 4.19-cip. I have no overview about
> what they already support or can realistically achieve, but it may be
> a plan B. If there is interest, I can ask them for an update on the
> current status.
This could possibly be an alternative to a newer kernel version. It
would be great if you could actually find out which drivers are
currently backported there. We especially need the latest drivers
regarding PCI Express endpoint functionality.
>
> Jan
>
Ralf

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