Why is SPM image so large (64 KB)?https://devzone.nordicsemi.com/f/nordic-q-a/91051/why-is-spm-image-so-large-64-kbWhile looking at ways to shrink the dfu image of our nrf9160 application, I was struck by how large the default SPM image is. Here&#39;s the file size breakdown: Final app_update.bin = 221KB with Main NS application including MCU boot 157KB (MCU Booten-USTelligent Community 13Wed, 17 Aug 2022 10:42:08 GMTRE: Why is SPM image so large (64 KB)?https://devzone.nordicsemi.com/thread/381976?ContentTypeID=1Wed, 17 Aug 2022 10:42:08 GMT137ad170-7792-4731-bb38-c0d22fbe4515:72e8301f-d0cd-434d-9b24-cda56493e755H&#229;kon Alseth<p>Hi,</p> <p>&nbsp;</p> <p>You could technically get spm down to 32k, but that has a cost of removing the secure services library (and all the depending libraries, like cc310), and thus the RNG function, which is a non-secure callable function. This sources the entropy library, and thus the rand32 library (function &quot;sys_rand32_get&quot;), which is used in most nRF9160 application</p> <p>&nbsp;</p> <p>Kind regards,</p> <p>Håkon</p><div style="clear:both;"></div>