Suggestions needed for resolving DT issues between kernel 3.10 and 4.4

[Mulyadi Santosa]

On Tue, Apr 4, 2017 at 6:11 PM, Fawad Lateef <fawadlateef at gmail.com> wrote:

> Hi,
>
> Just as an update (and for future reference for anyone having similar
> issue):
>
> I got this all this sorted-out. Had to change some dt-binding for
> device and it was mostly drivers related changes for hardware
> components. Mostly nothing to do with DT.
>
> Thanks
>
> Fawad Lateef
>
> -- Fawad Lateef
>
>
> On 3 April 2017 at 10:54, Fawad Lateef <fawadlateef at gmail.com> wrote:
> > Hi,
> >
> > One more thing I realised that eth0 which is working is directly out
> > of SOM/SOC but other 3 eth ports are connected to a internal USB
> > switch (so Linux should see only eth1 besides eth0).
> >
> > So seems like flash/nand chip (m25p80) and spi_ks8995 (Micrel KS8995
> > Ethernet switch SPI) mainly not working.
> >
> > Thanks
> >
> >
> >
> > -- Fawad Lateef
> >
> >
> > On 3 April 2017 at 10:38, Fawad Lateef <fawadlateef at gmail.com> wrote:
> >> Hi,
> >>
> >> I am facing some issues with device-trees (I am fairly new to them)
> >> and need some pointers about how to approach below problem:
> >>
> >> I got some I.MX6Q based hardware (some custom made whose hardware
> >> details are unknown to me). Hardware shipped with 3.10.53 kernel with
> >> full sources and everything is working on it
> >>
> >> Trying to get one of the recent kernel working on it (linux-4.4, from
> >> linux-linaro-stable with rt patches). I can compile the kernel and
> >> boot into it using 3.10.xx kernel compiled DTB but getting Warning at
> >> boot-time "Outdated DT detected, suspend/resume will NOT work" and few
> >> main hardware components not working (mainly ethernet(s) - 1 out of 4
> >> ports working though, MTD/NAND (for u-boot environment))
> >>
> >> So I looked into compiling the DTS (from 3.10 kernel) for 4.4 and
> >> managed to get it compiled. Now no warning of outdated DT _but_ still
> >> hardware components not working.
> >>
> >> I was assuming that as hardware is still same for both kernel 3.10 and
> >> 4.4, so it should work, but seems like something in DT is off for 4.4
> >> kernel.
> >>
> >> Any help and suggestions will be good enough for me to look into above
> issue.
> >>
> >> Thanks and regards,
> >>
> >> -- Fawad Lateef
>
>
Great share of issue plus the solution, Fawaad 😎

regards,

Mulyadi Santosa
Freelance Linux trainer and consultant

blog: the-hydra.blogspot.com
training: mulyaditraining.blogspot.com
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