Thanks Xiang,
I'm working off of 11.0.0, and don't see any of the files you point to in my
tree.
Can I start with one of the files below an integrate it into my board-specific
port
of 11.0.0 or do I need to start with a newer version?
Will I be missing any of the RPTUN/RPMSG generic framework if I stick with
11.0.0?
Ed
On Sat, Jul 22, 2023 at 1:56 AM Ed Sutter<edsutte...@gmail.com> wrote:
Hi,
I'm in the process of building up Nuttx on the M7 core of an iMX8MP SOC.
I started by creating a new chip and board directory duplicating the imxrt
stuff but renaming them appropriately. From there I've been slowly
creeping up in functionality with each of my needed device interfaces, and
I'm now at a point where I want to implement the RPMSG stuff in Nuttx to
talk to the Linux running on the A53s. I've got my own hack of RPMSG
running using in a Nuttx task using the NXP-SDK code. This just allows me
to send and receive messages between the M7 and the A53. That works fine;
however, I wanna redo this using whatever is the best path to take in Nuttx
for this.
You need implement rptun to enable OpenAMP, here are some implementation:
https://github.com/apache/nuttx/blob/master/arch/arm/src/nrf53/nrf53_rptun.c
https://github.com/apache/nuttx/blob/master/arch/risc-v/src/mpfs/mpfs_ihc.c
https://github.com/apache/nuttx/blob/master/arch/sim/src/sim/sim_rptun.c
In my case the "remote" processor I want to use RPMSG to communicate with
is in the same silicon, so there is no external interface (serial or
network), its a shared memory interface. I tried building up the
RPMSGSOCKET example but have not had any luck thus far, and then I noticed
RPMSG_UART. Is it reasonable to just make this look like a serial
connection on the Nuttx side, but under the covers use NXP's shared memory
hook to connect to the A53?
Yes, you can use either or both between M7 and A53, please watch the
introduction video here:https://www.youtube.com/watch?v=6uehz3WQ0vU
Since you want to communicate with Linux kernel, you have to write Linux
rpmsg driver.
Thanks
Ed
