topic Re: Any Other Interface can communicate with M4? or Change RPMsg Baud Rate? in i.MX Processors

Any Other Interface can communicate with M4? or Change RPMsg Baud Rate?

jh_cheon — Tue, 24 Mar 2020 10:21:12 GMT

I'm testing RPMsg on iMX8M.

I was using imx_rpmsg_tty driver as pre-installed example.

but seems data rate is fixed with 115200.

when i use stty -F /dev/ttyRPMSG30, it shows

speed 38400 baud; line = 0;

but actual speed looks like 115200. (Checked with usb to uart benchmarking Test on imx8 board ).

Is there any method to communication with Core and M4?

or Can i change the baudrate?

i already check this thread.

https://community.nxp.com/thread/460752

and I use debian and there's no unit_tests for it.

I've heard i can use RPMsg chr drive instead of tty driver.

Is there any references or instructions??

Thanks.

JungHoon

Re: Any Other Interface can communicate with M4? or Change RPMsg Baud Rate?

igorpadykov — Wed, 25 Mar 2020 00:46:16 GMT

Hi JungHoon

for RPMsg char driver one can look at

Asymmetric Multiprocessing: RPMsg – Linux/Android | Kynetics

Asymmetric Multiprocessing - Boundary Devices Nitrogen7 | Kynetics

unfortunately nxp does not support debian, in general one can try to write

own driver using other peripherals using examples in FreeRTOS SDK_EVK-MIMX8MQ

Welcome | MCUXpresso SDK Builder

Best regards
igor
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Re: Any Other Interface can communicate with M4? or Change RPMsg Baud Rate?

jh_cheon — Wed, 25 Mar 2020 07:43:03 GMT

Hi igor.

Seems when RPMsg char Driver is working, there's /dev/rpmsg_ctrl0 is created.

but it's not created when i enabled it at kernel configuration.

Not only the debian, i already test with YOCTO.

is there any part that i missing or need to another action for it??

Best Regards

JungHoon