From mboxrd@z Thu Jan  1 00:00:00 1970
From: Eric Nelson <eric@nelint.com>
Subject: Re: Question regarding RT patches for ARM
Date: Mon, 15 May 2017 07:12:55 -0700
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Cc: Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        kernelnewbies <kernelnewbies@kernelnewbies.org>,
        linux-rt-users@vger.kernel.org
To: Fawad Lateef <fawadlateef@gmail.com>,
        GuJiangfei <qiledexin@163.com>
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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:
https://github.com/Freescale/meta-freescale/blob/master/recipes-kernel/linux/linux-fslc-imx-rt/0003-Work-around-CPU-stalls-in-the-imx-sdma-driver.patch

Regards,


Eric