Peripherals and coprocessor

[Vthul]

Hi ,

I am working with STM32MPU DK2 and Distribution package and have some of basic queries.

1. How do i know which peripheral is connected to which Processor ? where can i get to know about this ?

1.1how do i know which device tree .dts is used ?

1.2 if i execute a new project from cubeMX it generates project skeleton and a .dts file, shoud i have to rebuild linux with this .dts?

1.3 On runtime, can i get to know if a particular peripheral is assigned a particular processor?

2. I have obtained the terminal of the board using Minicom and i m able to execute the programs on Linux A7 and M4 using the below links...

But how can i crossverify if M4 is what is being executed or other?

3. Where can i find the source code for AI demo from the Linux environment? or any demo that contains source files of both the processors application?

Background: Trying to establish a communication between A7 and M4 using RPMsg mechanism.

Thanks in Advance

Vivek

[Olivier GALLIEN]

Hi @Vthul​ 

1. How do i know which peripheral is connected to which Processor ? where can i get to know about this ?

Did you browse the wiki user guide ?

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

https://wiki.st.com/stm32mpu/wiki/How_to_assign_an_internal_peripheral_to_a_runtime_context#Manual_assignment

In CubeMX, Pinout&Configuration pane you have option "show context" accessible from the parameter wheel on top of peripheral list.

1.1how do i know which device tree .dts is used ?

on target look at /boot/extlinux/extlinux.conf file to see dts mapping with start menu selection.

1.2 if i execute a new project from cubeMX it generates project skeleton and a .dts file, shoud i have to rebuild linux with this .dts?

Yes you have to rebuild the dts generated by CubeMX.

See

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

or

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

1.3 On runtime, can i get to know if a particular peripheral is assigned a particular processor?

Check for IP status in cat /proc/device-tree/soc/ (CA7) and cat /proc/device-tree/m4@0/m4_system_resources/ ( CM4)

eg for a timer assigned on CM4 :

 root@stm32mp1:cat /proc/device-tree/soc/timer@40000000/timer\@1/status

disabled

root@stm32mp1:cat /proc/device-tree/m4@0/m4_system_resources/timer@40000000/status

okay

2. I have obtained the terminal of the board using Minicom and i m able to execute the programs on Linux A7 and M4 using the below links...

But how can i crossverify if M4 is what is being executed or other?

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

3. Where can i find the source code for AI demo from the Linux environment? or any demo that contains source files of both the processors application?

Background: Trying to establish a communication between A7 and M4 using RPMsg mechanism.

To start experiment communication between A7 and M4 using RPMsg mechanism I suggest you start by looking at the exemple OpenAMP_TTY_Echo provided in STM32MP1 Cube Package

see https://wiki.st.com/stm32mpu/wiki/STM32CubeMP1_Package

Hope it help

BR,

Olivier

[Vthul]

Hi Oliver,

Thanks a lot for the detailed answer.

Will check and update.

Viveknath