PROCESSOR-SDK-AM64X: IPC NOTIFY

Hello Elbon,

Please start by reading through the 2 pages in the "IPC Basics" section of the AM64x Academy. Then feel free to ask followup questions:
AM64x academy > Multicore > Inter-Processor Communication (IPC)
https://dev.ti.com/tirex/explore/node?node=A__AUE83PRMo.8eEVGecstaxg__AM64-ACADEMY__WI1KRXP__LATEST

Regards,

Nick

Hello,

I read this, but it says that when I have IPC between Linux and a remote core, I should use RPMsg. However, I think that I can have an IPC notification between the A53 core running Linux and the R5 core running FreeRTOS.

In the IPC Basics, I believe it refers to the example provided in the MCU+ SDK, but I am developing my own application.

Regards,

Elbon.

Hello Elbon,

I am the author of the AM64x Multicore academy. This academy module teaches you how to get Linux & MCU+ SDK running on different cores, on the same processor.

* The page "What IPC implementations are provided in the TI SDKs" tells you what drivers we provide and what is supported for those drivers. When I say "TI does NOT support using IPC Notify to interact with Linux", I mean that there is not a Linux mailbox driver to expose mailboxes up to Linux userspace.

* If you want to use the drivers that TI provides, that page gives all the details about what is supported. You could also implement your own IPC communication protocol using the tools that are discussed on page "What is IPC?". Just keep in mind that we are not able to answer questions about custom software development, only questions about TI software.

Regards,

Nick

Hello Nick,

So I have a question. Why is the A53 core present in the example ipc_notify_echo_am64x-evm_r5fss0-0_freertos_ti-arm-clang, as shown in these screenshots?

Regards,

Elbon

...

Hello Elbon,

On AM64x, MCU+ SDK running on A53 cores is an experimental feature (i.e., you can do it, but we cannot really support questions about it on the forums). See the banner at the top of the AM64x MCU+ SDK documentation:
https://software-dl.ti.com/mcu-plus-sdk/esd/AM64X/10_01_00_32/exports/docs/api_guide_am64x/index.html

Those remote core IDs are for when MCU+ SDK is running on the A53 cores, not when Linux is running on the A53 cores.

You will see something similar in Sysconfig > TI Drivers > IPC when you are enabling RPMessage. The "A53SS0 Core 0" entry is for if MCU+ SDK is running on the A53 cores, so if you are running Linux, that entry needs to be set to "ALL IPC DISABLED".
https://dev.ti.com/tirex/explore/node?node=A__Ac4gvmV7H7iX5x.qB.hWZw__AM64-ACADEMY__WI1KRXP__LATEST 

Regards,

Nick