How to enable RPMSG feature

[t-sen-developer]

Hi,

I have been working with imx8mn evk board and want make use of the rpmsg module to communicate between the 2 cores(A53 and M7).

I run the insmod command, but a /dev/ttyRPMSG file is not generated.
=> insmode /lib/modules/<version>/kernel/driver/rpmsg/imx_rpmsg_tty.ko

How to enable this /dev/ttyRPMSG port?
How do I establish communication between the M7 and A53 cores of the board?

BoardType:8MNANOLPD4-EVK
Yocto Image:core-image-base, imx-image-core

zcat /proc/config.gz > ./config
# Rpmsg drivers
CONFIG_RPMSG=y
CONFIG_RPMSG_CHAR=y
CONFIG_RPMSG_QCOM_GLINK=y
CONFIG_RPMSG_QCOM_GLINK_PRM=y
CONFIG_VIRTIO=y
CONFIG_HAVE_IMX_RPMSG=y
CONFIG_IMX_RPMSG_PINGPONG=m
CONFIG_IMX_RPMSG_TTY=m

Best regards,
Takeo.

[t-sen-developer]

Hi, 

I'm sorry to rush you, but ... I would appreciate it if you could give us your reply by May 14.

I understand you are very busy, but I want to solve this issue immediately.

Regards,

Takeo

[igorpadykov · Accepted solution]

Hi Takeo

one can try to use imx8mn-evk-rpmsg.dts

https://source.codeaurora.org/external/imx/linux-imx/tree/arch/arm64/boot/dts/freescale/imx8mn-evk-r...

https://source.codeaurora.org/external/imx/imx-test/tree/test/rpmsg?h=imx_5.4.70_2.3.0

Follow sect.2.8.4 Menu Configuration Options   i.MX Linux Reference Manual​

RPMSG examples in SDK_EVK-MIMX8MN:   https://mcuxpresso.nxp.com/en/welcome

Best regards
igor

[t-sen-developer]

Hi,igor

In the beginning, I tried to edit imx8mn-evk-rpmsg.dts.
However the problem is not solved yet.

I did the following.
Case1
1) edit imx8mx-evk-rpmsg.dts
2) bitbake linux-imx -c compile -f
3) bitbake linux-imx -c deploy
4) bitbake linux-imx
5) bitbake imx-image-core
6) Power ON (insert SD card image)
7) insmod /lib/modules/<version>/kernel/driver/rpmsg/imx_rpmsg_tty.ko
lsmod
　⇒Found imx_rpmsg_tty.
9) ls /dev/tty*
　⇒ Not found /dev/ttyRPMSG.

Case2
1-6) the same as above
7) Hit any key to stop autoboot
u-boot
　　editenv fdt_file
　　edit:imx8mn-evk-rpmsg.dtb
　　boot

　⇒the same result as above.

Where is the mistake in what I just did that ?

Best regards,
Takeo.

[t-sen-developer]

Thank you for your prompt reply.

Okay. I'll do that right away.

I'll contact you as soon as I finish reviewing.

Regards,
Takeo