https://community.nxp.com/t5/MCX-Microcontrollers/NXP-iMX-RT1064-Unprivileged-access/m-p/2151815#M3748 <P>Are you using FreeRTOS? If you change to privileged access, does the peripheral behave as expected? CSU information is on the security reference manual, for access, please contact your distributor.</P> <P>BR,<BR />Omar</P> Wed, 13 Aug 2025 18:37:29 GMT Omar_Anguiano 2025-08-13T18:37:29Z https://community.nxp.com/t5/MCX-Microcontrollers/NXP-iMX-RT1064-Unprivileged-access/m-p/2150841#M3734 <P>Hi NXP,&nbsp;</P><P>I am trying to access GPIO peripheral registers from Unprivileged Task, but it fails, and goes to hard fault handler. i have setup the MPU regions, there is not MPU fault. I heard something about setting up CSU, but could not find any reference on how to do it.</P><P>Can you help me in this.</P><P>Regards</P><P>Aakash</P><P><LI-PRODUCT title="MIMXRT1064-EVK" id="MIMXRT1064-EVK"></LI-PRODUCT>&nbsp;<a href="https://community.nxp.com/t5/user/viewprofilepage/user-id/61445">@nxp</a>&nbsp;</P> Tue, 12 Aug 2025 10:20:11 GMT https://community.nxp.com/t5/MCX-Microcontrollers/NXP-iMX-RT1064-Unprivileged-access/m-p/2150841#M3734 Aakash_Tegginamani 2025-08-12T10:20:11Z https://community.nxp.com/t5/MCX-Microcontrollers/NXP-iMX-RT1064-Unprivileged-access/m-p/2151815#M3748 <P>Are you using FreeRTOS? If you change to privileged access, does the peripheral behave as expected? CSU information is on the security reference manual, for access, please contact your distributor.</P> <P>BR,<BR />Omar</P> Wed, 13 Aug 2025 18:37:29 GMT https://community.nxp.com/t5/MCX-Microcontrollers/NXP-iMX-RT1064-Unprivileged-access/m-p/2151815#M3748 Omar_Anguiano 2025-08-13T18:37:29Z