https://devzone.nordicsemi.com/f/nordic-q-a/23237/what-is-the-recommended-irom-iram-setup-for-s140-5-0-0-3-alphaHi, this is what I use to use for .s140_nrf52840_5.0.0-1.alpha_softdevice: This doesn work for 5.0.0-3 alpha, as my app won&#39;t even download when using keil, I suppose it&#39;s overlapping with the 5.0.0-3 sd device. And I looked up the migrationen-USTelligent Community 13Mon, 10 Jul 2017 07:53:38 GMThttps://devzone.nordicsemi.com/thread/91390?ContentTypeID=1Mon, 10 Jul 2017 07:53:38 GMT137ad170-7792-4731-bb38-c0d22fbe4515:db22ca8c-2302-4bf4-9cea-328e385f3917Mitch996<p>Very clear and detailed, thanks a whole bunch, although it does not help me at all, I tried all the values and none of them get me further in my progress...</p> <p>Anywho I really, really appreciate this detailed reply, I now know how they are calculated and it will sure help me in the future.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/91389?ContentTypeID=1Wed, 05 Jul 2017 09:18:20 GMT137ad170-7792-4731-bb38-c0d22fbe4515:abcb0223-bdf4-4bff-a7ac-17f02501597fStian R&#248;ed Hafskjold<p><a href="http://infocenter.nordicsemi.com/topic/com.nordic.infocenter.s132.sds/dita/softdevices/s130/mem_usage/mem_resource_map_usage.html">infocenter.nordicsemi.com/.../mem_resource_map_usage.html</a></p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/91388?ContentTypeID=1Wed, 05 Jul 2017 09:17:51 GMT137ad170-7792-4731-bb38-c0d22fbe4515:ccd440da-b216-4a5c-ac29-e4ccccd3f195Stian R&#248;ed Hafskjold<p>###Settings for IROM1:<br /> <strong>start</strong> is where the softdevice ends and application starts<br /> <strong>size</strong> is what is left in flash for the application<br /> <strong>start</strong> and <strong>size</strong> should then add up to the size of flash. (The size values below are based on a 1MB (0x100000 bytes) flash size, which is, at the time of writing, the only option for the nRF52840 chip)</p> <pre><code> Start Size s140_5.0.0-1.alpha: 0x21000 0xDF000 s140_5.0.0-2.alpha: 0x22000 0xDE000 s140_5.0.0-3.alpha: 0x24000 0xDC000 </code></pre> <p>###Settings for IRAM1: <strong>start</strong> is where the softdevice RAM ends and application RAM starts<br /> <strong>size</strong> is what is left in RAM for the application<br /> <strong>start</strong> and <strong>size</strong> should then add up to the size of RAM (+ RAM start address which is 0x2000000). (The size values below are based on a 256kB (0x40000 bytes) RAM size, which is, at the time of writing, the only option for the nRF52840 chip)</p> <p>To find the RAM usage of the softdevice set a breakpoint in <code>softdevice_enable()</code> in <strong>softdevice_handler.c</strong> to see the <code>app_ram_base</code> return value after the <code>sd_ble_enable()</code> call. Adjust the IRAM1 settings accordingly.</p> <p>When I ran the ble_app_hrs example in SDK13.0.0 with SD 3.alpha, the value of <code>app_ram_base</code> was 0x20002670. Then settings will then be:</p> <pre><code>Start Size 0x20002670 0x3D990 (0x20002670 + 0x3D990 = 0x20040000) </code></pre><div style="clear:both;"></div>