Hi Fawad, On 05/17/2017 06:40 AM, Fawad Lateef wrote: > On 15 May 2017 at 16:20, Fawad Lateef <fawadlateef@xxxxxxxxx> wrote: >> Hi Eric, >> On 15 May 2017 at 16:12, Eric Nelson <eric@xxxxxxxxxx> 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. > SDMA is used for much more than NOR flash (SSI, USB, and sometimes UARTs). > 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: http://elinux.org/images/4/42/IRQs-_the_Hard%2C_the_Soft%2C_the_Threaded_and_the_Preemptible.pdf https://www.youtube.com/watch?v=-pehAzaP1eg&feature=youtu.be&list=PLbzoR-pLrL6pRFP6SOywVJWdEHlmQE51q Regards, Eric _______________________________________________ Kernelnewbies mailing list Kernelnewbies@xxxxxxxxxxxxxxxxx https://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
