topic Re: copy data fail when callback rpms function in i.MX Processors

copy data fail when callback rpms function

o_scherbinin — Sun, 24 Oct 2021 17:51:56 GMT

hello i use imx6sx to create simple rpmsg driver where pass data from rpmsg callback to a kernel thread.
The problem was that data is not copied, i.e. printk for the trhead works well, but coping to kthread buffer alwas fails.
That behavior is quite mysterious for me.
maybe you have any idea.
best wishes.

Re: copy data fail when callback rpms function

igorpadykov — Sun, 24 Oct 2021 23:35:47 GMT

Hi Oleg

may be useful to look at examples provided in NXP FreeRTOS releases

Windows Installer: i.MX 6SoloX FreeRTOS BSP 1.0.0 for Cortex-M4

Best regards
igor

Re: copy data fail when callback rpms function

o_scherbinin — Mon, 25 Oct 2021 03:46:00 GMT

Hello Igor.

I saw examples and i use it ( FreeRTOS task).

Problem exist in Linux driver when data copied to upper layer driver by reference.

Problem exist in Linux driver when data copied to upper layer driver by reference.
in case when data is generated inside the kthread, then passed properly.

Re: copy data fail when callback rpms function

igorpadykov — Mon, 25 Oct 2021 07:15:28 GMT

>Problem exist in Linux driver when data copied to upper layer driver by reference.

what "linux" used in the case. One can try latest nxp official linux from source.codeaurora.org/external/imx/linux-imx repository
https://source.codeaurora.org/external/imx/linux-imx/tree/?h=lf-5.10.y

Documentation

https://www.nxp.com/design/software/embedded-software/i-mx-software/embedded-linux-for-i-mx-applications-processors:IMXLINUX?tab=In-Depth_Tab

Best regards
igor