Use the Firmware examples for the CM4

Applicable platforms: STM32MP157-DK1, STM32MP157-DK2

The Firmware examples for the CM4 from STM32CubeMP1 are enabled in the demo configuration. All examples built are installed in the path /usr/lib/Cube-M4-examples/ We will use the GPIO_EXTI application for the example as it is easy to test.

# cd /usr/lib/Cube-M4-examples/GPIO_EXTI/
# ./fw_cortex_m4.sh start
fw_cortex_m4.sh: fmw_name=GPIO_EXTI.elf
[  284.342266] remoteproc remoteproc0: powering up m4
[  284.346258] remoteproc remoteproc0: Booting fw image GPIO_EXTI.elf, size
197496
[  284.353331] remoteproc remoteproc0: header-less resource table
[  284.358929] remoteproc remoteproc0: no resource table found for this
firmware
[  284.366048] remoteproc remoteproc0: header-less resource table
[  284.371881] remoteproc remoteproc0: remote processor m4 is now up

This run the GPIO_EXTI example on the Cortex M4 processor. Test the behavior of the CM4 application by Pushing the USER1 button to toggle the state of the LED7.

# ./fw_cortex_m4.sh stop
fw_cortex_m4.sh: fmw_name=GPIO_EXTI.elf
[  293.167161] remoteproc remoteproc0: warning: remote FW shutdown without
ack
[  293.172769] remoteproc remoteproc0: stopped remote processor m4

To stop the example running on the M4 processor.

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Use the Firmware examples for the CM4

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