A developer working with Nordic Semiconductor's nRF54L series discovered unexpected memory values in the Key Management Unit when using a debugger, revealing how debugger interactions with secure SoC components can produce misleading results. The issue involves understanding the SICR slots, KMU provisioning, and PSA cryptographic drivers that manage sensitive key storage and operations.
A developer at Nordic Semiconductor discovered unexpected memory values in the nRF54L series' Key Management Unit while using a debugger to manually inspect registers. The issue stems from how the debugger interacts with the SoC's security components, particularly the Secure Information Configuration Region (SICR) used for storing cryptographic keys and metadata.