https://devzone.nordicsemi.com/f/nordic-q-a/20826/secure-bootloader-sdk13-0-0-array-alignement-gccHi Nordic, During DFU tests i had weird issue. If i compileed bootloader using your makefile everything works fine, instead of compiling with Eclipse IDE. With Eclipse i dfu returns: &quot;Signature failed&quot; during update. The reason for that i think wasen-USTelligent Community 13Tue, 28 Mar 2017 14:05:01 GMThttps://devzone.nordicsemi.com/thread/81343?ContentTypeID=1Tue, 28 Mar 2017 14:05:01 GMT137ad170-7792-4731-bb38-c0d22fbe4515:ec5ba308-ee4a-4e71-93b0-33be803fccb7Hung Bui<p>Hi PanTikTak,</p> <p>It is actually a bug. I have reported it to our SDK team. I got the suggestion that this can be used :</p> <pre><code>__ALIGN(4) static uint8_t name ## _buffer[STRING_CONCATENATE(NRF_CRYPTO_ECDSA_SIGNATURE_SIZE_, type)] ; </code></pre> <p>Just so it would works on all platforms (IAR, KEIL, GCC)</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/81342?ContentTypeID=1Tue, 28 Mar 2017 09:29:30 GMT137ad170-7792-4731-bb38-c0d22fbe4515:6951d683-d502-4d7f-bd67-eafed699d58bFinisboy<p>Thank you so much for this,</p> <p>I had the exact same issue. The init packet would not be validated, though I&#39;m using the provided Makefiles, but a different version of gcc than Nordic are using(I&#39;m using v. 6.3.0)</p><div style="clear:both;"></div>