https://community.nxp.com/t5/i-MX-Processors/Need-Support-for-i-MX93-Tamper-Functionality-Configuration-and/m-p/2197556#M241879 <P>Hello NXP Team,</P><P>I am working on a custom board based on the <STRONG>NXP i.MX93</STRONG> processor and am currently trying to enable and test the <STRONG>tamper detection functionality</STRONG> under Linux.</P><H3><STRONG>System Details</STRONG></H3><UL><LI><P><STRONG>Processor:</STRONG> NXP i.MX93</P></LI><LI><P><STRONG>BSP Version:</STRONG> LF 6.6.52_2.2.0</P></LI><LI><P><STRONG>Operating System:</STRONG> Linux (Yocto-based build)</P><H3><STRONG>What I Have Tried</STRONG></H3><OL><LI><P>Reviewed the <STRONG>BBNSM (Battery-Backed Non-Secure Monitor)</STRONG> block and identified relevant registers:</P><UL><LI><P><STRONG>Base Address:</STRONG> 0x44440000</P></LI><LI><P><STRONG>Tamper Status / Enable / Clear Offsets:</STRONG> 0x30 / 0x34 / 0x38</P></LI></UL></LI><LI><P>Developed a small kernel module to map this region using ioremap() and read the registers.</P><UL><LI><P>However, the system <STRONG>crashes or powers off</STRONG> immediately after accessing these addresses.</P></LI><LI><P>Error observed:<BR />=&gt; Internal error: synchronous external abort: 000000009600001</P></LI><LI><P>Attempted reading with devmem2, but it results in a <STRONG>Bus error.</STRONG></P><P>These symptoms suggest that the <STRONG>BBNSM or tamper registers are secure-only</STRONG>, and thus not accessible from the non-secure (Linux) domain.</P></LI></UL></LI></OL><P><BR />Could you please provide guidance or documentation on:</P><UL><LI><P>How to <STRONG>enable and access the tamper detection functionality</STRONG> from Linux on i.MX93.</P></LI><LI><P>Whether <STRONG>tamper registers</STRONG> are accessible only in the <STRONG>secure domain</STRONG>.</P></LI><LI><P>Any <STRONG>device tree examples</STRONG>, reference drivers, or <STRONG>firmware configuration</STRONG> steps.required to expose tamper events to Linux.</P></LI></UL>Thank you for your support and guidance.<BR /><BR />Thanks.<P>&nbsp;</P></LI></UL> Mon, 03 Nov 2025 13:59:51 GMT IXM 2025-11-03T13:59:51Z https://community.nxp.com/t5/i-MX-Processors/Need-Support-for-i-MX93-Tamper-Functionality-Configuration-and/m-p/2197556#M241879 <P>Hello NXP Team,</P><P>I am working on a custom board based on the <STRONG>NXP i.MX93</STRONG> processor and am currently trying to enable and test the <STRONG>tamper detection functionality</STRONG> under Linux.</P><H3><STRONG>System Details</STRONG></H3><UL><LI><P><STRONG>Processor:</STRONG> NXP i.MX93</P></LI><LI><P><STRONG>BSP Version:</STRONG> LF 6.6.52_2.2.0</P></LI><LI><P><STRONG>Operating System:</STRONG> Linux (Yocto-based build)</P><H3><STRONG>What I Have Tried</STRONG></H3><OL><LI><P>Reviewed the <STRONG>BBNSM (Battery-Backed Non-Secure Monitor)</STRONG> block and identified relevant registers:</P><UL><LI><P><STRONG>Base Address:</STRONG> 0x44440000</P></LI><LI><P><STRONG>Tamper Status / Enable / Clear Offsets:</STRONG> 0x30 / 0x34 / 0x38</P></LI></UL></LI><LI><P>Developed a small kernel module to map this region using ioremap() and read the registers.</P><UL><LI><P>However, the system <STRONG>crashes or powers off</STRONG> immediately after accessing these addresses.</P></LI><LI><P>Error observed:<BR />=&gt; Internal error: synchronous external abort: 000000009600001</P></LI><LI><P>Attempted reading with devmem2, but it results in a <STRONG>Bus error.</STRONG></P><P>These symptoms suggest that the <STRONG>BBNSM or tamper registers are secure-only</STRONG>, and thus not accessible from the non-secure (Linux) domain.</P></LI></UL></LI></OL><P><BR />Could you please provide guidance or documentation on:</P><UL><LI><P>How to <STRONG>enable and access the tamper detection functionality</STRONG> from Linux on i.MX93.</P></LI><LI><P>Whether <STRONG>tamper registers</STRONG> are accessible only in the <STRONG>secure domain</STRONG>.</P></LI><LI><P>Any <STRONG>device tree examples</STRONG>, reference drivers, or <STRONG>firmware configuration</STRONG> steps.required to expose tamper events to Linux.</P></LI></UL>Thank you for your support and guidance.<BR /><BR />Thanks.<P>&nbsp;</P></LI></UL> Mon, 03 Nov 2025 13:59:51 GMT https://community.nxp.com/t5/i-MX-Processors/Need-Support-for-i-MX93-Tamper-Functionality-Configuration-and/m-p/2197556#M241879 IXM 2025-11-03T13:59:51Z https://community.nxp.com/t5/i-MX-Processors/Need-Support-for-i-MX93-Tamper-Functionality-Configuration-and/m-p/2198598#M241915 <P>Hello,<BR /><BR />We do not have/nor provide tamper documentation/example publicly, I would recommend to reach out your NXP sales office for more information related to this.<BR /><BR />Best regards/Saludos,<BR />Aldo.</P> Wed, 05 Nov 2025 00:27:55 GMT https://community.nxp.com/t5/i-MX-Processors/Need-Support-for-i-MX93-Tamper-Functionality-Configuration-and/m-p/2198598#M241915 AldoG 2025-11-05T00:27:55Z