  Realm Management Monitor (RMM) is an essential firmware component within the
recent Arm Confidential Computing Architecture (Arm CCA). Previous work applies
formal techniques to verify the specification and prototype reference
implementation of RMM. However, relying solely on a single verification tool
may lead to the oversight of certain bugs or vulnerabilities. This paper
discusses the application of ESBMC, a state-of-the-art Satisfiability Modulo
Theories (SMT)-based software model checker, to further enhance RRM
verification. We demonstrate ESBMC's ability to precisely parse the source code
and identify specification failures within a reasonable time frame. Moreover,
we propose potential improvements for ESBMC to enhance its efficiency for
industry engineers. This work contributes to exploring the capabilities of
formal verification techniques in real-world scenarios and suggests avenues for
further improvements to better meet industrial verification needs.
