topic 回复： Whether RPMsg and SRTM can be used for communicate between virtual partition in LS1028A in Layerscape

Whether RPMsg and SRTM can be used for communicate between virtual partition in LS1028A

jiaweilin — Fri, 28 Oct 2022 07:34:43 GMT

Hello,

I noticed the addition of RPMSG and SRTM capabilities for inter-core communication and device sharing in RT-Edge v2.3.

However, the documentation I found for RPMSG and SRTM was for the i.MX8 product platform, and I didn't see more detailed instructions.

Where can I find more detailed instructions on how to use RPMSG and SRTM?

Whether RPMsg and SRTM can be used for inter-core communication and device sharing between virtualized partitions in LS1028A?

回复： Whether RPMsg and SRTM can be used for communicate between virtual partition in LS1028A

jiaweilin — Wed, 09 Nov 2022 05:48:13 GMT

Could you give me some advice?

回复： Whether RPMsg and SRTM can be used for communicate between virtual partition in LS1028A

yipingwang — Thu, 10 Nov 2022 03:28:12 GMT

RPMsg and SRTM can't be used in LS1028A platform in RT-edge v2.3

about RPmsg, you can refer to the following link:
https://www.kernel.org/doc/html/latest/staging/rpmsg.html

thanks

回复： Whether RPMsg and SRTM can be used for communicate between virtual partition in LS1028A

jiaweilin — Thu, 10 Nov 2022 09:56:33 GMT

Thank you for the reply.

I have the following two questions.

1.Whether it can be done that implement inter-partition communication of jailhouse based on RPMsg on LS1028 by modifying DeviceTree or Linux driver? Can you provide relevant modification cases or explain what needs to be modified?

2. Does RT-Edge provide Jailhouse's original shared memory-based inter-partition communication API? Or where can I find instructions for the Jailhouse Interpartition communication API?

thanks!

回复： Whether RPMsg and SRTM can be used for communicate between virtual partition in LS1028A

yipingwang — Thu, 24 Nov 2022 07:40:56 GMT

1.
In real-time-edge-v2.3, RPMSG and SRTM are only used for virtual uart case between A-core(linux) and M-core(RTOS),
if want to use it in jailhouse, you should porting and modify the related code to Linux kernel or inmate system in jailhouse,
you can refer to drivers/tty/rpmsg_tty.c in linux.

2.
In jailhouse, there is inbuilt virtual NIC based on shared memory, you can refer to the keyword "JAILHOUSE_SHMEM_PROTO_VETH" in jailhouse code,
the virtual NIC can implement Interpartition communication.