AM6442: Loading firmware by remoteproc

Jakub Grad

Part Number: AM6442

Hello,

I am trying to load an application on core R5F0-0 from the /lib/firmware linux directory through remoteproc. I read here:

https://software-dl.ti.com/processor-sdk-linux/esd/AM64X/latest/exports/docs/linux/Foundational_Components_IPC64x.html

that a .resource_table section should be added to the linker script. What's in this section? Where to download resource_table_0.h? I don't know from where I can download this files.

I compiled the ipc_notify_echo_am64x-sk_r5fss0-0_freertos example from the SDK in CCS and placed the generated file in /lib/firmware and also created a symbolic link to the file named am64-main-r5f0_0-fw. Unfortunately, the app doesn't seem to work because I can't connect to it via RPMSG. I assume it's due to the lack of the above-mentioned section .resource_table. Is there anything else I should pay attention to?

Thank you for help.

Jakub

over 3 years ago

+1 Nick Saulnier over 3 years ago

TI__Guru** 110030 points

Hello Jakub,

Let's take a step back and ensure that you can run the default RPMsg example that is included in the default filesystem image for AM64x. Start with a TI EVM for AM64x, with an SD card that has the image with the word "default" in its name.

Please go to https://dev.ti.com/tirex/explore/node?devtools=AM64x_SK_EVM&node=AGqWQH5YSU6rleHcUT-o3w__7qm9DIS__LATEST and read through the Linux Academy, section "Evaluating Linux".

You will want to pay special attention to "Booting Remote Cores from Linux" and "Tour of TI Linux > IPC".

Regards,

Nick

+1 Jakub Grad over 3 years ago in reply to Nick Saulnier

Intellectual 770 points

Nick, thank you for response.

I've already tested the RPMSG on the reference image and it works. Now I want to build my own image in Yocto. I also tried to upload an example with the gpio_led_blink_am64x-sk_r5fss0-0_nortos led blinking. In the directory /lib/firmware I have placed the executable .out compiled with CCS. While booting the system, I see the message: Booting fw image am64-mcu-m4f0_0-fw. Unfortunately, the app does not seem to work on R5F0-0. When I uploaded the same application using JTAG, it worked.

Here

https://e2e.ti.com/support/processors-group/processors/f/processors-forum/594691/rtos-am5718-how-to-convert-out-to-xem4-file?tisearch=e2e-sitesearch&keymatch=xem4#

I read that the .out file must contain a resource_table section. Where can I find an example how to prepare executable in this way?

Here is an example of running an RPMSG on a PRU.

https://software-dl.ti.com/processor-sdk-linux/esd/AM64X/latest/exports/docs/linux/Foundational_Components/PRU-ICSS/RPMsg_Quick_Start_Guide.html

Where can I find the PRU_RPMsg_Echo_InterruptN application? I'm using the SDK: mcu_plus_sdk_am64x_08_03_00_18 but this example is missing.

0 Nick Saulnier over 3 years ago in reply to Jakub Grad

TI__Guru** 110030 points

Hello Jakub,

Since you clicked "this resolved my issue", I assume you figured out the problem.

Future readers, note that Linux to PRU RPMsg is a bit different from Linux to RPMsg with R5 or M4. To the best of my knowledge, we have not developed RPMsg between PRU and R5 or M4. For communication between PRU and R5/M4, see the PRUICSS driver: https://software-dl.ti.com/mcu-plus-sdk/esd/AM64X/08_02_00_31/exports/docs/api_guide_am64x/DRIVERS_PRUICSS_PAGE.html

Regards,
Nick

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AM6442: Loading firmware by remoteproc