https://devzone.nordicsemi.com/f/nordic-q-a/126730/nrf5340-enabling-dual-trustzoneHi, since the Nrf5340 has two identical Cortex-M33 cores, I was wondering whether it would be possible to enable the trustzone for both cores, and if yes, how. Thanks.en-USTelligent Community 13Tue, 27 Jan 2026 13:37:15 GMThttps://devzone.nordicsemi.com/thread/559689?ContentTypeID=1Tue, 27 Jan 2026 13:37:15 GMT137ad170-7792-4731-bb38-c0d22fbe4515:c9c14d76-a970-4015-9f96-1835854fa8c5Turbo J<p>The net core does not have trust zone support AFAIK.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/559684?ContentTypeID=1Tue, 27 Jan 2026 13:25:45 GMT137ad170-7792-4731-bb38-c0d22fbe4515:13f69058-a337-4c30-8870-8cb5b655463cVidar Berg<p>Hi,</p> <p>The&nbsp;<span>Arm TrustZone for Armv8-M Security Extensions are&nbsp;optional on the Cortex M33 and they are not&nbsp;</span>implement on the Network core MCU (Ref. <a href="https://docs.nordicsemi.com/bundle/ps_nrf5340/page/chapters/cpu_network/doc/cpu.html#ariaid-title4">https://docs.nordicsemi.com/bundle/ps_nrf5340/page/chapters/cpu_network/doc/cpu.html#ariaid-title4</a>).</p> <p>Best regards,</p> <p>Vidar&nbsp;</p><div style="clear:both;"></div>