permalink: /trustzone-sdk-docs/ta-development-modes.md

TA Development Modes

Comparison

no-std

  • Pros:

    • Reuses standard Rust tier-1 toolchain targets (aarch64-unknown-linux-gnu, arm-unknown-linux-gnueabihf).
    • Significant performance improvements.
    • Substantial reduction in binary size.

  • Cons:

    • Limited support for third-party crates. In the no-std mode, Trusted Applications (TAs) are unable to utilize crates dependent on the standard library (std).

std

  • Pros:

    • Enables the utilization of more third-party crates, including those requiring std, such as rustls, which are essential for functionality.

  • Cons:

    • Manual porting of std with infrequent updates. Currently using std version 1.80.0 and Rust version nightly-2024-05-14, which might not meet the MSRV requirements of some crates.

Supported Examples

  • Common: See Overview of OP-TEE Rust Examples.

  • no-std: Excludes test_serde, test_message_passing_interface, test_tls_client, test_tls_server, test_secure_db_abstraction.

  • std: Excludes test_mnist_rs, test_build_with_optee_utee_sys.