https://devzone.nordicsemi.com/f/nordic-q-a/25658/how-to-build-sdk-14-0-0-bootloader_secure_ble-with--o0What do I need to change to make &quot;bootloader_secure_ble&quot; build for armgcc (using Makefile in pca10040_debug) and -O0 (no size optimization )?en-USTelligent Community 13Tue, 10 Oct 2017 10:49:10 GMThttps://devzone.nordicsemi.com/thread/101095?ContentTypeID=1Tue, 10 Oct 2017 10:49:10 GMT137ad170-7792-4731-bb38-c0d22fbe4515:bdf20e9b-d4d5-49d2-8b73-21bed7487666Stian R&#248;ed Hafskjold<ol> <li> <p>Set -O0 flag in Makefile</p> </li> <li> <p>You need to change the flash size available to the bootloader. Go to the corresponding .ld file for your project (<strong>secure_dfu_gcc_pca10040_debug.ld</strong>, in the main project folder) and change the FLASH ORIGIN and LENGTH so that the bootloader fits. This should work: <code>FLASH (rx) : ORIGIN = 0x72000, LENGTH = 0xC000</code></p> </li> <li> <p>If you get <code>error: r7 cannot be used in asm here</code> add <code>-fomit-frame-pointer</code> to CFLAGS.</p> </li> </ol><div style="clear:both;"></div>