CCS Project For C66x/C71x Preloaded Firmware

General Discussion
1

I’m investigating the DSP processors on the AI-64, and I see that they are up and running on the Debian Linux distribution that comes with the board. For example, looking at “/sys/class/remoteproc/remoteproc12/state” it says “running”. The firmware is “vision_apps_eaik/vx_app_rtos_linux_c6x_1.out”.

In the “/lib/firmware” directory I can see j7-c66_0-fw.tisdk, j7-c66_1-fw.tisdk, and j7-c71_0-fw.tisdk. Also there is a vision_apps_eaik folder under firmware, with a number of “.out” files such as vx_app_rtos_linux_c6x_1.out, etc.

Looking at dmesg, I see the following:
[ 12.956528] k3-dsp-rproc 4d80800000.dsp: configured DSP for remoteproc mode
[ 12.986321] k3-dsp-rproc 4d80800000.dsp: local reset is deasserted for device
[ 13.030984] k3-dsp-rproc 4d81800000.dsp: assigned reserved memory node vision-apps-c66-dma-memory@a8000000
[ 13.044335] k3-dsp-rproc 4d81800000.dsp: configured DSP for remoteproc mode
[ 13.068549] k3-dsp-rproc 4d81800000.dsp: local reset is deasserted for device
[ 13.092159] remoteproc remoteproc12: powering up 4d80800000.dsp
[ 13.098137] remoteproc remoteproc12: Booting fw image vision_apps_eaik/vx_app_rtos_linux_c6x_1.out, size 1461044
[ 13.110395] k3-dsp-rproc 4d80800000.dsp: booting DSP core using boot addr = 0xa8d9a000
[ 13.126120] remoteproc12#vdev0buffer: assigned reserved memory node vision-apps-c66-dma-memory@a9000000
[ 13.148052] remoteproc12#vdev0buffer: registered virtio0 (type 7)
[ 13.154691] remoteproc remoteproc12: remote processor 4d80800000.dsp is now up

SO – MY QUESTION:

How was this built? Is there a CCS project I can clone or download to examine this code? Alternatively, is there a tutorial or code example to demonstrate some basic functionality in the C6x DSP?

I found a similar application for the EVM board, but I can’t find any way to build the EAIK firmware.

There is a “PRU Basics” posting which is very helpful for getting a simple GPIO example running on a PRU, it would be nice if there was something – anything – for the DSPs.

2

The TI page for Vision Apps is located here:
https://software-dl.ti.com/jacinto7/esd/processor-sdk-rtos-jacinto7/latest/exports/docs/vision_apps/docs/user_guide/index.html

This is not a Hello World example, but I’m hoping to learn enough about creating a useful DSP application to get started on my own project.

If anybody could point me to a more friendly tutorial (using CCS preferably) that would be very helpful. In any case, I will document what I learn in this thread.

3

Hi, you can try the examples also in the TI RTOS SDK ti-processor-sdk-rtos-j721e-evm-08_04_00_06/pdk_jacinto_08_04_00_21/packages/ti/drv/ipc/examples/linux/ipc_echo_test.c but you need to change the device tree for the reserved memory to match the linker settings. This example is more helloworld and implements a basic ping pong application.

1 Like
4

Also you can then use e.g https://git.ti.com/cgit/rpmsg/ti-rpmsg-char/about/ to control from Linux userspace.

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5

Hello, Thank you for this timely information. Would you know if this example will also run baremetal on the R5F?

6

Hi, you are right, my example above if using Freertos. In general the IPC examples can compiled for any of the accelerators. I used it also on the R5F.

That said, there is also a example for baremetal ti-processor-sdk-rtos-j721e-evm-08_04_00_06/pdk_jacinto_08_04_00_21/packages/ti/drv/ipc/examples/baremetal/ipc_baremetal_echo_test.c but I have not tried that.

One thing to note: When you run the example in parallel on several accelerator, it is doing a ping pong between all of them. Especially when you run Linux on the Cortex-A cores the sample kernel driver is also playing ping pong which sometimes is not so good during development :-). You probably can remove the sample driver doing this by recompiling the kernel.

7

Yes, I too had success with the FreeRTOS version running on R5SS0_CORE0. I will try to get the baremetal version working. If I get stuck, I will create a new thread and ask the group for help :slight_smile:

EDIT FYI: For baremetal R5F to Linux, the example is: ipc_echo_baremetal_test.