Add Zephyr + Alif E8 tutorial and Alif board conf

[psiddh]

Add a step-by-step tutorial for running MobileNetV2 on the Alif Ensemble E8 DevKit with ExecuTorch, Zephyr RTOS, and Ethos-U55 NPU delegation. Covers workspace setup, model export, FVP validation on Corstone-320, and Alif flashing with SE Tools (including the mramAddress gotcha).

Also adds the missing Alif E8 board conf that enables CONFIG_ETHOS_U and CONFIG_ET_ARM_MODEL_PTE_DMA_ACCESSIBLE (MRAM is DMA-accessible).

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/19260

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⏳ 219 Pending, 1 Unrelated Failure

As of commit 10da756 with merge base a7e44bf ():

FLAKY - The following job failed but was likely due to flakiness present on trunk:

• pull / test-coreml-bc-macos (macos-m2-stable) / macos-job (gh) (matched macos rule in flaky-rules.json)
  File doesn't exist

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[github-actions]

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[Copilot]

Pull request overview

Adds end-to-end documentation and board configuration support to run the existing Zephyr mv2-ethosu sample (MobileNetV2 + Ethos-U delegation) on the Alif Ensemble E8 DevKit, and makes the tutorial discoverable from the embedded docs section.

Changes:

• Added an Alif E8 DevKit (HP core) board-specific .conf enabling Ethos-U and skipping the SRAM model copy when MRAM is DMA-accessible.
• Added a step-by-step Zephyr + Alif E8 tutorial covering workspace setup, model export, FVP validation, and flashing via Alif SE Tools.
• Linked the new tutorial from the embedded documentation section/toctree.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
zephyr/samples/mv2-ethosu/boards/alif_e8_dk_ae822fa0e5597xx0_rtss_hp.conf	Enables CONFIG_ETHOS_U and CONFIG_ET_ARM_MODEL_PTE_DMA_ACCESSIBLE for the Alif E8 HP core target.
docs/source/zephyr_alif_tutorial.md	New tutorial documenting the complete flow for running MV2 on Alif E8 (and validating on Corstone-320 FVP).
docs/source/embedded-section.md	Adds the tutorial to the embedded docs list and hidden toctree so it’s discoverable/built.

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[Copilot]

Pull request overview

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

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[Copilot]

Pull request overview

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Pull request overview

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