Ipipe-Patch for kernel version 5.4.23

Jan Kiszka jan.kiszka at siemens.com
Tue Mar 3 15:48:39 CET 2020


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.

Jan

-- 
Siemens AG, Corporate Technology, CT RDA IOT SES-DE
Corporate Competence Center Embedded Linux



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