From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754289AbdEQNkf (ORCPT ); Wed, 17 May 2017 09:40:35 -0400 Received: from mail-ua0-f194.google.com ([209.85.217.194]:34805 "EHLO mail-ua0-f194.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753774AbdEQNkc (ORCPT ); Wed, 17 May 2017 09:40:32 -0400 MIME-Version: 1.0 In-Reply-To: References: <3aa42082.b247.15c0c29ca5e.Coremail.qiledexin@163.com> <646e1a43-78a7-3d04-ee29-1299b7d9d4d8@nelint.com> From: Fawad Lateef Date: Wed, 17 May 2017 15:40:10 +0200 Message-ID: Subject: Re: Question regarding RT patches for ARM To: Eric Nelson Cc: GuJiangfei , Linux Kernel Mailing List , kernelnewbies , linux-rt-users@vger.kernel.org Content-Type: text/plain; charset="UTF-8" Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Transfer-Encoding: 8bit X-MIME-Autoconverted: from quoted-printable to 8bit by mail.home.local id v4HDedCr005762 Hi, On 15 May 2017 at 16:20, Fawad Lateef wrote: > Hi Eric, > > > On 15 May 2017 at 16:12, Eric Nelson 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: >> 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 >> > > 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. 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. Thanks > >> Regards, >> >> >> Eric > > Regards, > > Fawad Lateef From mboxrd@z Thu Jan 1 00:00:00 1970 From: fawadlateef@gmail.com (Fawad Lateef) Date: Wed, 17 May 2017 15:40:10 +0200 Subject: Question regarding RT patches for ARM In-Reply-To: References: <3aa42082.b247.15c0c29ca5e.Coremail.qiledexin@163.com> <646e1a43-78a7-3d04-ee29-1299b7d9d4d8@nelint.com> Message-ID: To: kernelnewbies@lists.kernelnewbies.org List-Id: kernelnewbies.lists.kernelnewbies.org Hi, On 15 May 2017 at 16:20, Fawad Lateef wrote: > Hi Eric, > > > On 15 May 2017 at 16:12, Eric Nelson wrote: >> Hi Fawad, >> >>> ???????? >>> 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 >> > > 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. 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. Thanks > >> Regards, >> >> >> Eric > > Regards, > > Fawad Lateef