Update Ethos-U driver.

[iabdalkader]

• Update Ethos-U driver to the latest (v24.05)
• Allow passing extra C flags to the driver from the command line.
• Fixes Feature request: Update Ethos-U driver ? #2619

Note I tested with TARGET=cortex_m_corstone_300 test_network_tester_test and on real hardware as well built with:

make -j12 -f tensorflow/lite/micro/tools/make/Makefile \
TARGET=cortex_m_generic TARGET_ARCH=cortex-m55 \
CO_PROCESSOR=ethos_u ETHOSU_ARCH=u55 OPTIMIZED_KERNEL_DIR=ethos_u  \
CORE_OPTIMIZATION_LEVEL=-O2 KERNEL_OPTIMIZATION_LEVEL=-O2 \
THIRD_PARTY_KERNEL_OPTIMIZATION_LEVEL=-O2 \
TARGET_TOOLCHAIN_ROOT=/opt/arm-none-eabi/bin/ \ 
TARGET_TOOLCHAIN_PREFIX=arm-none-eabi- BUILD_TYPE=release microlite

BUG=#2619

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[iabdalkader]

Rebased.. unsure how to fix that CI entry test error.

[rascani]

Did you have a particular reason for migrating from using a download link to using git clone? The URL approach would continue to work by simply updating the link to:

https://review.mlplatform.org/plugins/gitiles/ml/ethos-u/ethos-u-core-driver/+archive/9622608a5cc318c0933bcce720b59737d03bfb6f.tar.gz

Regardless of HTTP or git download, it is important that we version based on the SHA, not the tag. Tags can be moved, which can result in our scripts breaking (this has happened before). While SHAs can technically be erased too, that is significantly less likely.

[iabdalkader]

Did you have a particular reason for migrating from using a download link to using git clone?

I was just following the existing pattern for the other Ethos platform package, which is also a git repo. It's also easier to tell which specific version of the driver is being used from a tag or SHA than from a download URL or even the downloaded package. Finally, probably only important for development, but if you want to check out a different commit for testing something, you can't do that with a downloaded package.

I've switched to commit SHA and retested the build, and retested on hardware.

[rascani]

Rebased.. unsure how to fix that CI entry test error.

Don't worry about this, it's just an issue I haven't had time to fix in the CI system. Basically, it is erroring because it doesn't have the ready to merge label applied, but that shouldn't be needed until after the PR is approved.

Thank you for the PR! It is greatly appreciated.

[iabdalkader]

@rascani Seems my patch might have broken some test here: https://github.com/tensorflow/tflite-micro/actions/runs/10087978372/job/27892985767

I'll try to fix it.

[rascani]

Thanks @iabdalkader

[mansnils]

Thanks for this @iabdalkader

[iabdalkader]

You're welcome. Note that there were some issue that I've missed because the workflow runs on schedule. The workflow for Cortex-M doesn't take much time, just a little over 10 minutes, so perhaps it's best to change it to trigger on PRs. This could save a lot of time in the future.

[mansnils]

Yes agreed. We are looking into that.