Which platform_info.c should we refer to?

[sinall]

We are currently experimentalling Open-AMP with OpenHarmony LiteOS-A on 3516DV300 board. We want to make as less efforts as possible to make the echo program run on LiteOS-A. LiteOS-A is similar to Linux, it has POSIX API layer.

What we are trying:

1. Run LiteOS-A with rpmsg-sample-ping on primary core using first 86MB physical memory
2. Run LiteOS-A with rpmsg-sample-echo on secondary core using middle 40MB physical memory
3. Map the last 2MB to /dev/uio0 for above 2 LiteOS-A

In Open-AMP, we find several different implementations of platform_info.c:

1. apps/system/linux/machine/generic/platform_info.c
2. apps/machine/zynqmp_r5/platform_info.c
3. apps/machine/zynqmp/platform_info.c
4. apps/machine/zynq7/platform_info.c

We have tried to adapt apps/system/linux/machine/generic/platform_info.c to apps/system/liteos_a/machine/generic/platform_info.c, but the shm_open is broken on LiteOS-A. Then we found the other implementations uses metal_device_open but metal_shmem_open.

Questions:

1. What's the relationship between openamp.shm and /dev/uio0?
2. Should we continue to try metal_shmem_open, or should we try to use metal_device_open like zynqmp?

[arnopo]

Not sure that the Linux implementation is adapted. I suggest you to have a look instead in https://github.com/OpenAMP/open-amp/blob/main/apps/machine/zynqmp_r5/platform_info.c. this implemntation is adapted for
Some other implementations which do not use the OpenAMp remoteproc framework:

• Zephyr:
  • host: https://elixir.bootlin.com/zephyr/latest/source/samples/subsys/ipc/openamp/src/main.c
  • copro: https://elixir.bootlin.com/zephyr/latest/source/samples/subsys/ipc/openamp/remote/src/main.c
• ST baremetal copro (using resource table): https://elixir.bootlin.com/zephyr/latest/source/samples/subsys/ipc/openamp/src/main.c#L167