How to use remoteproc on STM32MP151?

[HMasu.1]

I want to use remoteproc to load and start firmware on Coretex-M4 from Cortex-A7.

I refer to the following Wiki page.

https://wiki.st.com/stm32mpu/wiki/Linux_remoteproc_framework_overview

In above Wiki page, I have tried [4.1.1 Remote processor boot through sysfs].

However, I can't find "remoteprocX(e.g. remoteproc0)" directory in "/sys/class/remoteproc/" directory.

("/sys/class/remoteproc/" directory has no any sub-directory or files at all)

What should I do to create "remoteprocX(e.g. remoteproc0)" directory in "/sys/class/remoteproc/" directory?

Do I have to modify Linux kernel configuration or Device Tree? 

For the reference, [Support for Remote Processor subsystem] and [STM32 remoteproc support] is enabled in Linux kernel configuration as modules , and these have being loaded by "modprobe" command.

Best regards.

H. Masuda

[HMasu.1]

Hi, @ArmandG​ 

I send the .config and .dtb.

.config is located in /tmp-glibc/work/stm32mp1_eval-ostl-linux-gnueabi/linux-stm32mp/4.19-r0/build/

And, is the kernel trace dmesg?

I send dmesg log, so please let me know if I'm misunderstanding.

Best Regards​,

​H. Masuda

[ArmandG]

Hello @HMasu.1​ ,

In your .config file I can see that config_remoteproc and config_rpmsg parameters are still equal to "m" and not "y".

Are you sure you saved or cross compiled again the kernel as it is written here:

https://wiki.st.com/stm32mpu/wiki/Menuconfig_or_how_to_configure_kernel

It seems that no changes have occured.

Best regards,

Armand

[HMasu.1]

Hi @ArmandG​ 

Sorry. I had reverted the kernel config (CONFIG_STM32_IPCC, CONFIG_REMOTEPROC and CONFIG_RPMSG parameters equal to "m") because the same error occurs when CONFIG_STM32_IPCC, CONFIG_REMOTEPROC and CONFIG_RPMSG parameters are changed to "y".

I have set ​CONFIG_STM32_IPCC, CONFIG_REMOTEPROC and CONFIG_RPMSG to "y" again.

( The same error occurs, I can't find "remoteprocX(e.g. remoteproc0)" directory in "/sys/class/remoteproc/" directory.)​

I send the .config, dmesg log and .dtb again in above setting.

please check it.

Best Regards​, 

​H. Masuda

[HMasu.1]

Hi @ArmandG​ ,

​Can you reproduce with my setup?

Please let me know if you have any information.

Best Regards​, 

​H. Masuda

[ArmandG]

Hi @HMasu.1​ ,

Sorry for the late reply.

I escalated your question to the development team.

I keep you posted.

Best regards,

Armand

[HMasu.1]

Hi @ArmandG​ ,

Thank you for your confirmation.

​After modifying my description of memory section used by rpmsg (e.g. vdev or shared memory) in the Device Tree, I was able to create "remoteprocX(e.g. remoteproc0)" directory in "/sys/class/remoteproc/" directory.

Thank you for your support.

​H. Masuda

[Christophe Guibout]

Hi @HMasu.1​ ,

Good to see that you fixed the issue !

Could you please share the patch you did ? We continuously improve our solution and all contributions are welcome :)

BR,

Christophe

[HMasu.1]

Hi, @Christophe Guibout​ 

Thank you for your message.

Sorry, I haven't created the proper patch yet.

I could solve the problem by following way.

1) Add following sub node in both root node and reserved-memory node of root node in my kernel device tree.

-rsctbl

-vring0

-vring1

-shm0

-shm1

-shm10

-shm11

-shm12

-shm13

​2) Add following m4_rproc node in addons user code area in my device tree.

&m4_rproc {

memory-region = <&retram>, <&mcuram>, <&mcuram2>, <&vedv0buffer>;

};

Best Regards.

H. Masuda

[Christophe Guibout · Accepted solution]

Hi @HMasu.1​ ,

So, you need to have at least <&vdev0vring1> and <&vdev0buffer> in « memory-region » property, otherwise, it will not work as expected.

In case of non functionnal feature, I would recommand to look into one of the ST reference board device tree (example of m4_rproc entry in stm32mp15xx-dkx.dtsi) in order to cross-check that everything in fine in your own DT.

BR,

Christophe