Zynq7000 user space openamp status

[Morand, Guy]

OpenAmp developpers,

I'm already a bit familiar with remoteproc and rpmsg but I'm new to openamp. I'm
trying to bring up the echo-server test example from Xilinx on a customized
Zynq7000 platform. It seems to work until now but despite the RTOS side is using
openamp/libmetal, the specific rpmsg kernel module is used to communicate from
the echo-test user space application that were moved to "obsolete" folder:

https://github.com/OpenAMP/open-amp/commit/2b420ddaeb25881203b74f27d0c1674a6b2915e3

Now I'm trying to build a yocto image for the zynq with open-amp examples. I
"quickly and dirtly" changed the following in libmetal and open-amp recipes:
-EXTRA_OECMAKE_append_zynqmp = "-DWITH_APPS=ON"
+EXTRA_OECMAKE_append = "-DWITH_APPS=ON"

But open-amp fails building:
apps/system/linux/machine/generic/platform_info.h:33:37: fatal error: openamp/remoteproc_plat.h: No such file or directory
#include "openamp/remoteproc_plat.h"

* Have you planned to support the Zynq7000 platform?
* Is open-amp Linux user space abstraction layer ready for the Zynq700?
* Is there somewhere an openamp/remoteproc_plat.h file available for the Zynq7x?

Happy hacking,

Guy Morand

[Jiaying Liang]

HI Morand,

[Wendy] Previously, the reason we move the Linux rpmsg user modules and the Linux applications which is to use the RPMsg user modules to obsolete directory is because we wanted to re-write the RPMsg user module to make it upstreamable to Linux kernel, and then OpenAMP repo doesn't need to maintain a Linux kernel module. I think Marek and Bjorn had been working on it at the same time. You can see the RPMsg char module from the upstream kernel: https://github.com/torvalds/linux/blob/master/drivers/rpmsg/rpmsg_char.c

We also moved these RPMsg modules(which will be replaced by the Linux RPMsg char) and the Linux application to use this RPMsg module to meta-openamp:
https://github.com/OpenAMP/meta-openamp/tree/master/recipes-kernel/rpmsg-user-module
https://github.com/OpenAMP/meta-openamp/tree/master/recipes-openamp/rpmsg-examples

Our plan is when we will support 4.11 kernel, we will change the OpenAMP library on Linux implementation to use the RPMsg char driver.

Best Regards,
Wendy

>
> Happy hacking,
>
> Guy Morand
>
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