https://devzone.nordicsemi.com/f/nordic-q-a/79541/yaml-set-to-448k-ramWhy does the nrf5340dk_nrf5340_cpuapp.yaml contain a ram setting of 448? Is that incorrect?en-USTelligent Community 13Mon, 13 Sep 2021 18:13:15 GMThttps://devzone.nordicsemi.com/thread/329280?ContentTypeID=1Mon, 13 Sep 2021 18:13:15 GMT137ad170-7792-4731-bb38-c0d22fbe4515:f6c41158-982a-4d26-884d-f122f5f38012Jordan Archer<p>Just for clarity, shouldn&#39;t that be enumerated in the dts files?&nbsp;&nbsp;<br /><br />Thanks for the answer.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/329213?ContentTypeID=1Mon, 13 Sep 2021 11:55:53 GMT137ad170-7792-4731-bb38-c0d22fbe4515:96fedb81-80ef-4594-94be-f0c7c5e2313chelsing<p>Hi Jordan,</p> <p>The reason why you see only 448, not 512, is because 64kB of SRAM is allocated to the shared memory between nRF5340 CPUNET and nRF5430 CPUAPP(both secure and non-secure).&nbsp;The shared memory is used for&nbsp;<a href="https://developer.nordicsemi.com/nRF_Connect_SDK/doc/1.6.1/nrf/ug_nrf5340.html#inter-core-communication">Inter-core communication</a>.</p> <p>64kB is the default size of the shared memory region. This size can be adjusted.</p> <p>Checking out the board folder for nRF5340 DK is one way to learn more, for example these two files:&nbsp;</p> <p>\v1.6.1\zephyr\boards\arm\nrf5340dk_nrf5340\nrf5340_shared_sram_planning_conf.dts</p> <p>\v1.6.1\zephyr\boards\arm\nrf5340dk_nrf5340\nrf5340_cpuapp_partition_conf.dts</p> <p></p> <p></p> <p>Best regards,</p> <p>Håkon</p><div style="clear:both;"></div>