Need Support for i.MX93 Tamper Functionality Configuration and Access in Linux

[IXM]

Hello NXP Team,

I am working on a custom board based on the NXP i.MX93 processor and am currently trying to enable and test the tamper detection functionality under Linux.

System Details

• Processor: NXP i.MX93

• BSP Version: LF 6.6.52_2.2.0

• Operating System: Linux (Yocto-based build)

  What I Have Tried

  1. Reviewed the BBNSM (Battery-Backed Non-Secure Monitor) block and identified relevant registers:

     • Base Address: 0x44440000

     • Tamper Status / Enable / Clear Offsets: 0x30 / 0x34 / 0x38

  2. Developed a small kernel module to map this region using ioremap() and read the registers.

     • However, the system crashes or powers off immediately after accessing these addresses.

     • Error observed:
       => Internal error: synchronous external abort: 000000009600001

     • Attempted reading with devmem2, but it results in a Bus error.

       These symptoms suggest that the BBNSM or tamper registers are secure-only, and thus not accessible from the non-secure (Linux) domain.

  
  Could you please provide guidance or documentation on:

  • How to enable and access the tamper detection functionality from Linux on i.MX93.

  • Whether tamper registers are accessible only in the secure domain.

  • Any device tree examples, reference drivers, or firmware configuration steps.required to expose tamper events to Linux.

  Thank you for your support and guidance.
  
  Thanks.