TDA4VH-Q1: Adding IPC to DSP FW

Hi Kien,

Kien said:

I am currently building C66X DSP firmware using the yocto build system.

We are unable to understand this statement. We are not sure how you are building C66x DSP firmware using Yocto. The PSDK Linux SDK, which has the Yocto Build, does not support this today. Can you please explain in detail with steps what you are doing?

Ideally, using the PSDK RTOS release to build the C66x DSP image would be best. See the documentation steps here: 

[1] https://software-dl.ti.com/jacinto7/esd/processor-sdk-rtos-j784s4/10_00_00_05/exports/docs/psdk_rtos/docs/user_guide/firmware_builder.html#build-firmware

[2] https://software-dl.ti.com/jacinto7/esd/processor-sdk-rtos-j784s4/10_00_00_05/exports/docs/vision_apps/docs/user_guide/BUILD_INSTRUCTIONS.html 

Kien said:

I have successfully built the DSP firmware without IPC. Now, I need your help to include IPC in our DSP firmware .

What do you mean by including IPC? Ideally, if you use

the TI-provided SDK, IPC must already be pre-integrated in the DSP build.

Kien said:

I am trying to build ‘ti-ipc-rtos_git.bb’ ( in meta-ti/meta-ti-extras/recipes-ti/ipc), but it uses source files “git://git.ti.com/git/ipc/ipc-examples.git” and ipc metadata form “git://git.ti.com/git/ipc-metadata.git” which does not support the ‘j721e-evm’ target.

We are unsure what guide or documentation you are following or who guided you in doing this. Please provide us with the details.

We suggest you read the documentation that accompanies PSDK RTOS to understand the different components and how they are built. Next, you must understand how the firmware images are included in the Yocto build.

Thanks.

Hi Kien,

To add on to Praveen's response, our SoC runs a HLOS (high level operating system) such as Linux + RTOS on different cores. In general:

• PSDK Linux for the firmware running on A72 CPU cores (with some exceptions since it also includes GPU firmware)
• PSDK RTOS for firmware running on all other cores and hardware accelerators including C7x DSP and R5F cores

So for the IPC firmware source code running on the remote processors like C7x, I would recommend downloading the Processor SDK RTOS and reading through the documentation that Praveen has provided. The source code for the remote processor are all included in the tar file: https://www.ti.com/tool/download/PROCESSOR-SDK-RTOS-J784S4.  

Additionally, for learning how the remote processors running RTOS can communicate using IPC with A72 Linux, I would recommend reading through this Linux documentation: https://software-dl.ti.com/jacinto7/esd/processor-sdk-linux-j784s4/10_00_00_08/exports/docs/linux/Foundational_Components_IPC_J784S4.html.

It goes through where the remote processor firmware is located in filesystem, how to replace them, and how to interact with these remote processor firmware using commandline tools like rpmsg_char_simple.

Regards,

Takuma