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BSP base layer for the STM32MP1

This layer just makes a bit easier to use the meta-st-openlinux and meta-st-stm32mp layers with poky and build images. There is a script that automates the yocto setup.

This layer also adds an extra machine which is based on the stm32mp1-disco and it's named stm32mp1-discotest.

How to use this layer

To build the image you need to use the repo tool and the manifest.xml in this repo.

Clone all repos

In order to build the image you need all the

cd stm32mp1-yocto
repo init -u
repo sync

After the repo tool is finished then you should find all the meta layers in the sources/ directory.

Setting the environment

Then from the top directory run these commands:

ln -s sources/meta-stm32mp1-bsp-base/scripts/ .

Then run this command to build an image that supports qt5 and eglfs. You may not really need a GUI, but by default I use it for my convenience.

MACHINE=stm32mp1-discotest DISTRO=openstlinux-eglfs source ./ build

Then build the image

bitbake stm32mp1-qt-eglfs-image

If you need the SDK then run:

bitbake -c populate_sdk stm32mp1-qt-eglfs-image

Flash the image on the target

To flash the image to the target you need to use the STM32CubeProgrammer and place the BOOT0 and BOOT1 switches to OFF, then connect a USB cable from your host to the USB connector near the HDMI connector and run the STM32CubeProgrammer like this:

cd build/tmp-glibc/deploy/images/stm32mp1-discotest/flashlayout_stm32mp1-qt-eglfs-image
sudo '/opt/STM32CubeProgrammer/bin/STM32_Programmer_CLI' -c port=usb1 -w flashlayout_stm32mp1-qt-eglfs-image/trusted/FlashLayout_sdcard_stm32mp157c-dk2-trusted.tsv

The above command assumes that the STM32CubeProgrammer is installed in the /opt path. You can also use the gui if you like, but this method might be more convenient, especially if the gui doesn't run on your host for some reason (there are many complains about the gui in Linux).


To test that eglfs and the display are working properly then boot the board and then in the console run these commands;

cd /usr/share/examples/gui/openglwindow

You can also test the gpu with glmark2 like this:


Bonus material

I've also added two recipes in meta-stm32mp1-bsp-base/recipes-extended/stm32mp1-rpmsg-test. These recipes can be used to build a cmake firmware for the CM4 and a Linux application for the CPU that benchmark the OpenAMP, which the IPC which is used for communication between the CM4 (Cortex-M4) and the CA7 (Cortex-A7). By default those recipes are added in the stm32mp1-qt-eglfs-image image.

The CM4 firmware is located in /lib/firmware/stm32mp157c-rpmsg-test.elf. There is also a script that loads the firmware in the CM4 and it's located in /home/root/ Finally, there's an app that tests the OpenAMP and it's located in /home/root/tty-test-client.

To test the OpenAMP run those commands on the board's console:

cd /home/root
./ start             # This loads the CM4 firmware
./tty-test-client /dev/ttyRPMSG0    # Runs the test
./ stop              # This unloads the CM4 firmware

This is a sample output of the benchmark tool

- 19:46:58.168 INFO: Application started
- 19:46:58.169 INFO: Connected to /dev/ttyRPMSG0
- 19:46:58.176 INFO: Initialized buffer with CRC16: 0x1818
- 19:46:58.177 INFO: ---- Creating tests ----
- 19:46:58.177 INFO: -> Add test: block=512, blocks: 1
- 19:46:58.177 INFO: -> Add test: block=512, blocks: 2
- 19:46:58.177 INFO: -> Add test: block=512, blocks: 4
- 19:46:58.177 INFO: -> Add test: block=512, blocks: 8
- 19:46:58.177 INFO: -> Add test: block=1024, blocks: 1
- 19:46:58.177 INFO: -> Add test: block=1024, blocks: 2
- 19:46:58.177 INFO: -> Add test: block=1024, blocks: 4
- 19:46:58.177 INFO: -> Add test: block=1024, blocks: 5
- 19:46:58.177 INFO: -> Add test: block=2048, blocks: 1
- 19:46:58.177 INFO: -> Add test: block=2048, blocks: 2
- 19:46:58.177 INFO: -> Add test: block=4096, blocks: 1
- 19:46:58.177 INFO: ---- Starting tests ----
- 19:46:58.189 INFO: -> b: 512, n:1, nsec: 11840174, bytes sent: 512
- 19:46:58.208 INFO: -> b: 512, n:2, nsec: 18479159, bytes sent: 1024
- 19:46:58.239 INFO: -> b: 512, n:4, nsec: 31140586, bytes sent: 2048
- 19:46:58.296 INFO: -> b: 512, n:8, nsec: 56413315, bytes sent: 4096
- 19:46:58.311 INFO: -> b: 1024, n:1, nsec: 15380189, bytes sent: 1024
- 19:46:58.336 INFO: -> b: 1024, n:2, nsec: 24917144, bytes sent: 2048
- 19:46:58.381 INFO: -> b: 1024, n:4, nsec: 43986764, bytes sent: 4096
- 19:46:58.434 INFO: -> b: 1024, n:5, nsec: 53546303, bytes sent: 5120
- 19:46:58.456 INFO: -> b: 2048, n:1, nsec: 21874506, bytes sent: 2048
- 19:46:58.494 INFO: -> b: 2048, n:2, nsec: 37771655, bytes sent: 4096
- 19:46:58.532 INFO: -> b: 4096, n:1, nsec: 37891197, bytes sent: 4096

For more details browse the code in the recipe's url repo.


Dimitris Tassopoulos


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