https://devzone.nordicsemi.com/f/nordic-q-a/28302/s132-5-1-0-excessive-ram-usageFrom the S132 5.1.0 specification, I expect that its RAM usage should be only 0x1228 bytes plus ATTR_TAB_SIZE. However, when I compile two of the example projects using IAR, I&#39;m seeing an APP_RAM_BASE higher than expected, in one case by an extra 16KBen-USTelligent Community 13Thu, 14 Dec 2017 20:13:58 GMThttps://devzone.nordicsemi.com/thread/111758?ContentTypeID=1Thu, 14 Dec 2017 20:13:58 GMT137ad170-7792-4731-bb38-c0d22fbe4515:27ac7370-ea52-49b4-824b-a1d84bc43433Eric Smith<p>Hung Bui&#39;s comment is correct. For the ble_app_hrs_freertos_pca10040_s132 app with SDK 14.2 and S132 5.1.0, just changing the start of RAM variable in the linker script to a lower value works fine with IAR. (Possibly a different toolchain needs the IRAM1 size change he mentions, but IAR doesn&#39;t seem to use that.)</p> <p>With those specific versions, the lowest RAM start address that works for that project is 0x20001f50. I&#39;m still not sure why that&#39;s about 2KB higher than what the S132 specification indicates, which would be 0x200017a8, but it leaves enough RAM for my application.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/111757?ContentTypeID=1Wed, 13 Dec 2017 15:56:57 GMT137ad170-7792-4731-bb38-c0d22fbe4515:bae1a573-e5d8-4321-98cb-74272d286f29Hung Bui<p>Hi Eric,</p> <p>I believe it&#39;s just a mistake. The RAM requirement from the softdevice is 0x200020E0 and IRAM1 size can be adjusted to 0xDF20</p><div style="clear:both;"></div>