Use mimx93_evk_a55 board for SOF also

[dbaluta]

We previously created a synthetic board named mimx93_evk_a55_sof but this is not a good direction to take.

We need to use the default board mimx93_evk_a55 and adapt it to SOF using dts overlays and Kconfig fragments.

After these patches we can build SOF firmware image for A55 using:

west build -p --board mimx93_evk_a55  modules/audio/sof/app

[LaurentiuM1234]

Looks good. Assuming mimx93_evk_a55_sof will be removed from Zephyr don't forget to also update LP64 CI which uses it. Currently, things are a bit weird IMO with the mmu_regions.c using the regions from the overlay but these regions will be removed anyways when the support for native drivers is added. Out of curiosity: did you also try building SOF from Zephyr side using these changes?

[dbaluta]

Out of curiosity: did you also try building SOF from Zephyr side using these changes?

I only build SOF from Zephyr side like this:

#  clone zephyr repo, run west init, west update
# build zephyr.bin
$ west build -p --board mimx93_evk_a55  modules/audio/sof/app

Do you remember where was the L64 CI PR that added this support.

Also, thinking about this. I wonder if we shouldn't somehow used 32bits for SOF FW with a55. As an experiment using 64 bits is fine.

But I think for a more practical usecases when imx95 will arrive we should compile SOF firmware for a55 core with 32 bits support rather than 64 bits.

We don't really need 64 bits and we also save some space.

[LaurentiuM1234]

Do you remember where was the L64 CI PR that added this support.

#7772

Also, thinking about this. I wonder if we shouldn't somehow used 32bits for SOF FW with a55. As an experiment using 64 bits is fine.

But I think for a more practical usecases when imx95 will arrive we should compile SOF firmware for a55 core with 32 bits support rather than 64 bits.

We don't really need 64 bits and we also save some space.

This will require some experimentation. Zephyr seems to compile arm64 binaries using the lp64 flag atm so we'll have to watch out for this too.

[dbaluta]

@iuliana-prodan @LaurentiuM1234

Changes since v1:

• removed mimx93_a55_evk_sof board conf file
• fixed .github action for compiling lp64

[kv2019i]

@dbaluta Feel free to merge.