Difference between revisions of "DESK-MP1-L/Development/Asymmetric Multiprocessing (AMP) with OpenAMP"

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<section begin="Body" />
 
<section begin="Body" />
  
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==Asymmetric Multiprocessing (AMP) with OpenAMP==
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==Introduction==
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As known, the STM32MP115x SoC is powered by a heterogeneous architecture comprising a single/dual ARM Cortex-A7 (CA7) and an ARM Cortex-M4 (CM4). When the application requires implementing an [https://en.wikipedia.org/wiki/Asymmetric_multiprocessing Asymmetric Multiprocessing configuration (AMP)], the most common scenario is to use Linux on the CA7, and bare metal or RTOS-based firmware on the CM4. In either case, the [https://www.openampproject.org/ OpenAMP framework] is typically used to establish a [https://wiki.st.com/stm32mpu/wiki/Coprocessor_management_overview communication channel between the cores]. The [[DESK-MP1-L/Development/Building the Yocto BSP|Yocto build system]] at the heart of the DESK-MP1-L provides some examples based on OpenAMP to demonstrate how to set up AMP configurations. The following section illustrates one of them, namely <code>OpenAMP_TTY_echo</code>. This example is built when Yocto is run to generate the Linux root file system for the target.
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As known, the STM32MP115x SoC is powered by a heterogeneous architecture comprising a single/dual ARM Cortex-A7 (CA7) and an ARM Cortex-M4 (CM4). When the application requires implementing an Asymmetric Multiprocessing configuration (AMP), the most common scenario is to use Linux on the CA7, and bare metal or RTOS-based firmware on the CM4. In either case, the [[https://www.openampproject.org/ OpenAMP framework]] is typically used to establish a communication channel between the cores. DESK-MP1-L provides some examples based on this framework to demonstrate how to set up AMP configurations. The following section illustrates one of them, namely OpenAMP_TTY_echo.
  
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For more details, please see the [https://www.st.com/en/embedded-software/stm32cubemp1.html STM32CubeMP1 firmware] documentation and the associated [https://github.com/STMicroelectronics/STM32CubeMP1/tree/1.6.0/Projects/STM32MP157C-DK2/Applications/OpenAMP/OpenAMP_TTY_echo source code].
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For more details please see the [https://www.st.com/en/embedded-software/stm32cubemp1.html STM32CubeMP1 firmware] and the [https://github.com/STMicroelectronics/STM32CubeMP1/tree/1.6.0/Projects/STM32MP157C-DK2/Applications/OpenAMP/OpenAMP_TTY_echo source code].
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===Running the OpenAMP_TTY_echo example===
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==Running the OpenAMP_TTY_echo example==
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The example is automatically built by Yocto. To run it, please issue the following commands on the target's Linux console:
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The example is automatically built by Yocto. To run it, please issue the following commands on the target's console:
 
<pre class="board-terminal">
 
<pre class="board-terminal">
 
root@desk-mp1:~# cp /usr/local/Cube-M4-examples/STM32MP157C-DK2/Applications/OpenAMP/OpenAMP_TTY_echo/lib/firmware/OpenAMP_TTY_echo.elf /lib/firmware/
 
root@desk-mp1:~# cp /usr/local/Cube-M4-examples/STM32MP157C-DK2/Applications/OpenAMP/OpenAMP_TTY_echo/lib/firmware/OpenAMP_TTY_echo.elf /lib/firmware/
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offline
 
offline
 
root@desk-mp1:~#
 
root@desk-mp1:~#
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</pre>It is worth remembering that it is also possible to start the CM4 firmware before the Linux kernel is started.
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</pre>

Revision as of 14:19, 3 August 2023

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History
Issue Date Notes
03/08/2023 DESK-MP1-L-1.0.0 release



Introduction[edit | edit source]

As known, the STM32MP115x SoC is powered by a heterogeneous architecture comprising a single/dual ARM Cortex-A7 (CA7) and an ARM Cortex-M4 (CM4). When the application requires implementing an Asymmetric Multiprocessing configuration (AMP), the most common scenario is to use Linux on the CA7, and bare metal or RTOS-based firmware on the CM4. In either case, the [OpenAMP framework] is typically used to establish a communication channel between the cores. DESK-MP1-L provides some examples based on this framework to demonstrate how to set up AMP configurations. The following section illustrates one of them, namely OpenAMP_TTY_echo.

For more details please see the STM32CubeMP1 firmware and the source code.

Running the OpenAMP_TTY_echo example[edit | edit source]

The example is automatically built by Yocto. To run it, please issue the following commands on the target's console: 

root@desk-mp1:~# cp /usr/local/Cube-M4-examples/STM32MP157C-DK2/Applications/OpenAMP/OpenAMP_TTY_echo/lib/firmware/OpenAMP_TTY_echo.elf /lib/firmware/
root@desk-mp1:~# echo -n OpenAMP_TTY_echo.elf  > /sys/class/remoteproc/remoteproc0/firmware
root@desk-mp1:~# echo start >/sys/class/remoteproc/remoteproc0/state
root@desk-mp1:~# dmesg | tail -n 8
[   69.935241] remoteproc remoteproc0: powering up m4
[   69.940260] remoteproc remoteproc0: Booting fw image OpenAMP_TTY_echo.elf, size 219192
[   69.947843]  remoteproc0#vdev0buffer: assigned reserved memory node vdev0buffer@10042000
[   69.957458] virtio_rpmsg_bus virtio0: creating channel rpmsg-tty addr 0x400
[   69.964031] virtio_rpmsg_bus virtio0: rpmsg host is online
[   69.968816]  remoteproc0#vdev0buffer: registered virtio0 (type 7)
[   69.976364] remoteproc remoteproc0: remote processor m4 is now up
[   69.981515] virtio_rpmsg_bus virtio0: creating channel rpmsg-tty addr 0x401
root@desk-mp1:~# stty -onlcr -echo -F /dev/ttyRPMSG0
root@desk-mp1:~# cat /dev/ttyRPMSG0 &
root@desk-mp1:~# echo "Hello Virtual UART0" > /dev/ttyRPMSG0
Hello Virtual UART0
root@desk-mp1:~# cat /sys/class/remoteproc/remoteproc0/state
running

To stop the demo: 

root@desk-mp1:~# echo stop > /sys/class/remoteproc/remoteproc0/state
[  104.989459] remoteproc remoteproc0: warning: remote FW shutdown without ack
[1]+  Done                       cat /dev/ttyRPMSG0
root@desk-mp1:~# cat /sys/class/remoteproc/remoteproc0/state
offline
root@desk-mp1:~#
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