Arm’s PSA defines a set of mandatory interfaces for secure boot, cryptography, storage, and attestation (PSA Certified APIs). Despite clear specifications, real-world firmware often introduces subtle violations:
Modern PSA vehicles (2018–2025) rely heavily on dual-wire CAN (Controller Area Network) and Diag over IP (DoIP). The 4.4.0 update introduced a stricter timeout protocol. If your cable has a slow chip (common in cheap clones), this checker will flag a "Response Timeout" error before DiagBox even launches—saving you hours of frustration. psa interface checker 4.4.0