TMDS64EVM: IPC Notify when Linux is running on the A53

Thomas Ambrogini

Part Number: TMDS64EVM

Good morning,

we are encountering problems with the IPC Notify object on the AM64x. We are using the evalboard TMDS64EVM.

Our system has Linux on A53 and FreeRTOS on all R5F and M4 microcontrollers. This is our IPC communication configuration.

I made a test where the R5F0_0 sends an IPC Notify to R5F0_1 but it doesn't work.

It seems that the IPC Notify receiving callback doesn't wake up when we try to send the notification to that specific client.

I check both the destination core id and also the destination client id and they seem correct. Moreover the IPC Notify send operation returns SUCCESS.

I also tried to configure system with IPC Notify Only, but with the same bad results.

I looked for on the web but I found only examples of IPC Notify in AM64x system without Linux on board.

Is there something different in the configuration and use of IPC Notify when Linux A53 IPC RP Message is enabled?

Do you have some examples similar to the above case?

over 1 year ago

0 Swargam Anil over 1 year ago

TI__Mastermind 47546 points

Hello Thomas Ambrogini,

I need few details to solve your issue.

In your system, do you need an IPC in between the Linux core A53 and all the R5F and M4F cores?

Can you please confirm? Which version of the MCU+SDK you using?

If you need ipc in between all cores, the above configuration is fine.

If you need IPC in between custom core selection the MCU+SDK example will not work . We have to do some changes in the Application .

Just try to understand how you loaded all ipc examples, either from CCS or Linux.

Which boot mode you are using ?

Regards,

S.Anil

0 Thomas Ambrogini over 1 year ago in reply to Swargam Anil

Prodigy 55 points

Hello Swargam Anil,

The idea was to use IPC Notify between R5F and M4F cores, while using RPMessage for the communication with linux. Although we are communicating with Linux from only one of the R5Fs, could that be the problem?

I am using the latest version of the MCU+SDK (9.01).

The firmware is loaded through Linux, booted from the SD card.

Regards,

Thomas

0 Swargam Anil over 1 year ago in reply to Thomas Ambrogini

TI__Mastermind 47546 points

Thomas Ambrogini said:
The idea was to use IPC Notify between R5F and M4F cores, while using RPMessage for the communication with linux. Although we are communicating with Linux from only one of the R5Fs, could that be the problem?

Thomas,

I am routing your query to Linux expert , mostly you will get reply by today.

Regards,

S.Anil.

0 Nick Saulnier over 1 year ago in reply to Swargam Anil

TI__Guru** 102170 points

Hello Thomas,

Key information so far

MCU+ SDK 9.1 is used (NOTE, make sure to build the MCU+ projects as a system project, as described here):
https://e2e.ti.com/support/processors-group/processors/f/processors-forum/1324828/faq-mcu-sdk-build-error-expected-expression-rpmsgparams-vringtxtaseaddr

MCU+ firmware is booted from Linux remoteproc

Give us additional debug details

Let's start by making sure that Linux is actually loading your processor cores properly. Please share your boot log (or if you are not comfortable sharing the whole boot log, give me this output):
dmesg | grep remoteproc
dmesg | grep rpmsg

Helpful resources

Here are some useful AM64x academy pages:

How to boot remote cores from Linux (including how to load new binaries):
https://dev.ti.com/tirex/explore/node?a=7qm9DIS__LATEST&node=A__AdAyuKWUWVV5j4wBc7C6XA__AM64-ACADEMY__WI1KRXP__LATEST

How to write MCU+ projects so that they can be booted by Linux:
https://dev.ti.com/tirex/explore/node?a=7qm9DIS__LATEST&node=A__AeMVTHckwFDmFoNkRHpRPw__AM64-ACADEMY__WI1KRXP__LATEST

NOTE that linker.cmd files are no longer the default memory configuration method starting in MCU+ SDK 9.1, so if you follow that second page step by step you won't be able to just apply the linker.cmd patch files. I am trying to update the Multicore academy module for SDK 9.1 within the next couple of weeks, but in the meantime you can find major differences between SDK 9.0 and SDK 9.1 here:
https://e2e.ti.com/support/processors-group/processors/f/processors-forum/1323865/sk-am64b-syscfg-ti_drivers_config-o-build-errors-while-trying-to-build-led-blink-example-with-ipc/5036614#5036614

Regards,

Nick

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TMDS64EVM: IPC Notify when Linux is running on the A53