https://devzone.nordicsemi.com/f/nordic-q-a/85875/mbedtls-issue-when-updating-to-nrf-sdk-v1-9-1Hello I&#39;m about to update from NRF SDK v1.8 to NRF SDK v1.9.1. We build our firmware for both NRF9160 but also for QEMU_X86 (simulation build). I noticed that since the update the function call to mbedtls_ctr_drbg_seed fails with the error code 0x34en-USTelligent Community 13Thu, 17 Mar 2022 10:18:22 GMThttps://devzone.nordicsemi.com/thread/358594?ContentTypeID=1Thu, 17 Mar 2022 10:18:22 GMT137ad170-7792-4731-bb38-c0d22fbe4515:0e72ef8a-0ef3-47d6-933e-05e7f9062dceElfving<p>I see. I assume you are using the modem, and getting entropy from CryptoCell? Are you using SPM?</p> <p>Are there any other changes you have made to the project while porting it from NCS 1.8 to 1.9.1?</p> <p>Regards,</p> <p>Elfving</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/358439?ContentTypeID=1Wed, 16 Mar 2022 13:14:50 GMT137ad170-7792-4731-bb38-c0d22fbe4515:40e16491-1e9d-44bb-9b44-309b0dee08a1mglettig<p>Yes it looks like the same problem occurs with nRF9160.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/358401?ContentTypeID=1Wed, 16 Mar 2022 11:56:13 GMT137ad170-7792-4731-bb38-c0d22fbe4515:5a87b5ea-d509-43d4-be89-341d378b5662Elfving<p>Hello Michael,</p> <p>So you are saying you get the same issue when only building for the nRF9160?</p> <p>Regards,</p> <p>Elfving</p><div style="clear:both;"></div>