Adjustable rpmsg size #195
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Signed-off-by: Gaute Nilsson <gaute.nilsson@siemens.com>
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Can you take a look at this? Having this change in the upstream repo would be very nice for our project. |
The RPMSG_BUFFER_SIZE need align with kernel definiton, both side(OpenAMP and Linux kernel) need negotiate the new buffer size), you can see the patch here: |
There are also discussions around resource table evolution to address the point. |
| @@ -74,5 +74,9 @@ endif (WITH_ZEPHYR) | |||
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| option (WITH_LIBMETAL_FIND "Check Libmetal library can be found" ON) | |||
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| if (DEFINED RPMSG_BUFFER_SIZE) | |||
| add_definitions( -DRPMSG_BUFFER_SIZE=${RPMSG_BUFFER_SIZE} ) | |||
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This needs a documentation update somewhere to tell the user that they can change the default, and that changing the default will make it incompatible with the Linux kernel implementation. I think that this change or #155 is major enough to bring up in the next openamp-rp call, or on the mailing list.
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Hi @edmooring,
Agree on the principle for the Documentation. We have to discuss the way to provide a documentation accessible to contributors.
Concerning this commit itself, it is not a major change. The RPMSG_BUFFER_SIZE can already be customized (https://github.com/OpenAMP/open-amp/blob/master/lib/include/openamp/rpmsg_virtio.h#L25)
So this patch only exports the definition, to be able to define the size in the make command line instead of updating the makefiles.
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Hi @arnopo
For now, putting it in README.md, near the instructions for building OpenAMP for the various platforms would be fine with me.
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That makes sense, as some other cmake options have also to be defined (e.g WITH_VIRTIO_SLAVE, WITH_VIRTIO_MASTER ) , i would propose to have a dedicated thread for this.
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Use and restriction of the RPMSG_BUFFER_SIZE option will de documented in |
Add option to adjust RPMSG_BUFFER_SIZE during CMake build