# SPI loading

The secure peripheral image loading (PIL) of a TrustZone authenticates different images and configures the xPUs for all subsystems such as audio, camera, and video.

For more information about xPU, see [Access control](https://docs.qualcomm.com/doc/80-70018-11/topic/access-control.html#access-control).

## Next steps

- To learn about the next security feature, see [SELinux](https://docs.qualcomm.com/doc/80-70018-11/topic/selinux.html#selinux).
- To learn about TrustZone and security framework, see [Security architecture](https://docs.qualcomm.com/doc/80-70018-11/topic/architecture.html#architecture).
- To learn about APIs that can be used to interact with Linux and hardware, see [Security APIs](https://docs.qualcomm.com/doc/80-70018-11/topic/interfaces.html#interfaces).

Last Published: Apr 10, 2025

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