Question regarding RT patches for ARM

Eric Nelson eric at
Wed May 17 10:45:39 EDT 2017

Hi Fawad,

On 05/17/2017 06:40 AM, Fawad Lateef wrote:
> On 15 May 2017 at 16:20, Fawad Lateef <fawadlateef at> wrote:
>> Hi Eric,
>> On 15 May 2017 at 16:12, Eric Nelson <eric at> wrote:
>>> Hi Fawad,
>>>> 发自网易邮箱大师
>>>> On 05/15/2017 20:44, Fawad Lateef wrote:
>>>> Hi All,
>>>> I am working on custom i.MX6 quad hardware and using RT patches for
>>>> almost latest stable kernel 4.9 and facing some weird system stall OR
>>>> 'unhandled page fault - exceptions'.
>>> I'm not sure about the unhandled page fault, but the stalls may be
>>> because of the SDMA driver.
>>> See this patch in the Freescale/NXP community for kernel 4.1:
>> Thanks for the patch link. I will give it a try.
> Talked to hardware manufacturer and they applied the patch.
> Still that SDMA is only used for NOR flash and only u-boot and its
> environment are stored in nor flash. So not sure if that is going to
> help in any case.

SDMA is used for much more than NOR flash (SSI, USB, and sometimes

> So I would really like few more suggestions OR confirmations about ARM
> (cortex-A9 based imx6) (preemept)-RT support/patches are stable and
> can be used for final products.

I don't have any experience with the RT patches on 4.9 or later
kernels, but do know that they're being used on i.MX6 with the
vendor kernels (3.10.x, 4.1.x).

I believe Alison Chaiken mentioned using them with 4.9 kernels:



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