RPMSG char driver Linux 4.14.98

greg_edwards — Mon, 23 Jan 2023 16:46:39 GMT

We currently have RPMsg working through the tty driver but we want to switch to the char driver.

We are building with Yocto Sumo release with Linux 4.14.98 linux-imx which has no support for RPMSG_VIRTIO_CHAR or RPMSG_CRTL configuration options.

Does NXP have an official upgrade/patch to get rpmsg character driver running with 4.14.98 kernel or do I need to port one of the other third party solutions? Would porting lf-5.15.y rpmsg package be a good place to start?

Re: RPMSG char driver Linux 4.14.98

AldoG — Wed, 25 Jan 2023 23:48:12 GMT

Hello,

Have you tried using RPMSG_CHAR?
https://github.com/nxp-imx/linux-imx/blob/lf-5.15.y/drivers/rpmsg/Kconfig#L9

I'm not aware of such a patch, please note that the rpmsg_char/rpmsg_ctrl driver is not written or maintained by us, so maybe looking into the Linux community may be a better idea:
https://lwn.net/Articles/841058/
https://lwn.net/Articles/873758/

Best regards,
Aldo.

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RPMSG char driver Linux 4.14.98

Re: RPMSG char driver Linux 4.14.98