How add /dev/rpmsg_sdb for exchanging data buffers with the coprocessor

[ASega.1]

Hi,

I'm using stm32mp157a-dk1 and I would like to use rpmsg_sdb for exchanging data buffers with the coprocessor (https://wiki.st.com/stm32mpu/wiki/How_to_exchange_data_buffers_with_the_coprocessor).

I built the image for the A7 following the "STM32MP1 Distribution Package" tutorial without problem (https://wiki.st.com/stm32mpu/wiki/STM32MP1_Distribution_Package#Flashing_the_built_image).

But in the dev folder I can't find the rpmsg_sdb device.

Is there a prebuild image for A7 with this driver?

If not, how can I add the recipe rpsmg-sdb-mod Yocto recipe to the image of the distribution tutorial using bitbake?

In case, is there other ways to get the device rpmsg_sdb?

Thank you in advance.

Best regards,

Andrea Segalla

[Olivier GALLIEN · Accepted solution]

Hi @ASega.1​ ,

The device rpmsg_sdb is populated thanks to recipes in :

STMicroelectronics/meta-st-stm32mpu-app-logicanalyser: Application example: high data rate exchange from Cortex-M4 to Cortex-A7 (github.com)

Refer to the readme in order to have the complete instruction to integrate it in your build

Olivier

[ASega.1]

Dear @Community member ,

Thanks for the reply.

I tried this morning to add the layer meta-st-stm32mpu-app-logicanalyser following the tutorial you suggest to me but it returns me errors in the last command:

bitbake-layers add-layer ../layers/meta-st/meta-st-stm32mpu-app-logicanalyser

the errors returned:

NOTE: Starting bitbake server...

Traceback (most recent call last):

 File "/home/midac/ProjectYocto/sdb/openstlinux-5.10-dunfell-mp1-21-11-17/layers/openembedded-core/bitbake/bin/bitbake-layers", line 95, in <module>

  ret = main()

 File "/home/midac/ProjectYocto/sdb/openstlinux-5.10-dunfell-mp1-21-11-17/layers/openembedded-core/bitbake/bin/bitbake-layers", line 63, in main

  tinfoil.prepare(True)

 File "/home/midac/ProjectYocto/sdb/openstlinux-5.10-dunfell-mp1-21-11-17/layers/openembedded-core/bitbake/lib/bb/tinfoil.py", line 414, in prepare

  self.run_command('parseConfiguration')

 File "/home/midac/ProjectYocto/sdb/openstlinux-5.10-dunfell-mp1-21-11-17/layers/openembedded-core/bitbake/lib/bb/tinfoil.py", line 470, in run_command

  raise TinfoilCommandFailed(result[1])

bb.tinfoil.TinfoilCommandFailed: Traceback (most recent call last):

 File "/home/midac/ProjectYocto/sdb/openstlinux-5.10-dunfell-mp1-21-11-17/layers/openembedded-core/bitbake/lib/bb/command.py", line 74, in runCommand

  result = command_method(self, commandline)

 File "/home/midac/ProjectYocto/sdb/openstlinux-5.10-dunfell-mp1-21-11-17/layers/openembedded-core/bitbake/lib/bb/command.py", line 275, in parseConfiguration

  command.cooker.parseConfiguration()

 File "/home/midac/ProjectYocto/sdb/openstlinux-5.10-dunfell-mp1-21-11-17/layers/openembedded-core/bitbake/lib/bb/cooker.py", line 433, in parseConfiguration

  self.handleCollections(self.data.getVar("BBFILE_COLLECTIONS"))

 File "/home/midac/ProjectYocto/sdb/openstlinux-5.10-dunfell-mp1-21-11-17/layers/openembedded-core/bitbake/lib/bb/cooker.py", line 1225, in handleCollections

  raise CollectionError("Errors during parsing layer configuration")

bb.cooker.CollectionError: Errors during parsing layer configuration

Do you have the same problem or probably I made some mistake?

Thanks in advance.

Best Regards,

Andrea

[Olivier GALLIEN]

Hi @ASega.1​ ,

The add-layer steps works properly at my end.

Double check all the procedure and eventually retry on a clean environment.

Olivier

[ASega.1]

Hi @Community member​ ;

I tried again and now it works.

Thanks so much for the helping.

Best Regards,

Andrea