Cortex M33 Cross compilation

[Anonymous]

Hi all,

I was trying to cross compile the hello world project using the following command using my Linux (x86 system)

make -f tensorflow/lite/micro/tools/make/Makefile TARGET=cortex_m_generic TARGET_ARCH=cortex-m33 hello_world

However, I haven't been able to resolve the following error starting at the following line.

exit.c:(.text.exit+0x16): undefined reference to `_exit'

Any leads would be appreciated!

Thanks

[Advait Jain]

The cortex_m_generic target is to build a static library only which can then be linked against while building binaries for your target hardware.

This library is created at (tensorflow/lite/micro/tools/make/gen/cortex_m_generic_cortex-m33_default/lib/libtensorflow-microlite.a with the following command:

make -f tensorflow/lite/micro/tools/make/Makefile TARGET=cortex_m_generic TARGET_ARCH=cortex-m33 hello_world

The example or test binaries need to be built for specific target hardware (using the associated libraries). For example, the bluepill target uses stm32_bare_lib.

Such hardware-specific integration should happen external to the TFLM build system.

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[Anonymous]

Got it, thanks. So, how do I build an m33 example binary from the given libtensorflow-microlite.a on my linux machine? Any article/resource for the same would be helpful.

Best,

Kunal

[Pete Warden]

Hi Kunal,

               the tricky part is that to offer you advice on how to build for the Cortex M33, we'll need to know what operating system you're using on the chip. Otherwise it's like asking how to build a program for x86, without specifying if the x86 machine will be running Linux or Windows. If you can give us information on that, it will help us give you better recommendations.

Pete

To view this discussion on the web visit https://groups.google.com/a/tensorflow.org/d/msgid/tflite/CAP8oJ%3DSmpGXoMXTrisqYn12EFxDcUXC1EaRpwqBNHLh-htYkvg%40mail.gmail.com.

[Anonymous]

Hey Pete,

I am using a Linux system.

Please let me know what you recommend for the same.

Thanks

[Pete Warden]

Hi Kunal,

               Linux doesn't run on the Cortex M33 chip, so I assume you mean you're using Linux on the machine you're building on? What OS are you using on the Cortex M33 itself?

Pete

[Anonymous]

Hi Pete,

Sorry my bad. The OS is FreeRTOS.

Thanks

[Pete Warden]

Thanks Kunal! We don't have official support for FreeRTOS, but the Espressif-maintained ESP32 port does use the OS, so you can see an example of the sort of main function you'll need here:

https://github.com/tensorflow/tflite-micro/blob/main/tensorflow/lite/micro/examples/micro_speech/esp/main.cc

You'll have to figure out how to integrate the library into FreeRTOS yourself.

[Anonymous]

Hi Pete, thanks for the response. I have one question. I am quite new to TFLM but for TFL we can easily cross compile for say android as mentioned here (https://www.tensorflow.org/lite/guide/build_cmake). Isn't such a way possible for TFLM for the Cortex M series?

Thanks

[eric li]

Hi Kunal,

I encounter the same link issue as yours in cortex-M33, I also haven't found any solution for it yet, have you found a solution for it? Thanks.

Best,

Eric