https://devzone.nordicsemi.com/f/nordic-q-a/125946/nrf54l15-ram-retention-in-off-stateHi I am working on nRF54L15-DK (PCA10156 0.9.2 2024.49) with chip N54L15 QFAAB0 2444AA I am using Nordic SDK 3.0.2 and Zephyr 4.0.99 My task is to have the top 2K of the RAM as retained and survive during OFF (battery still connecrted :-) ) Inen-USTelligent Community 13Tue, 02 Dec 2025 15:33:24 GMThttps://devzone.nordicsemi.com/thread/556032?ContentTypeID=1Tue, 02 Dec 2025 15:33:24 GMT137ad170-7792-4731-bb38-c0d22fbe4515:ae8df641-78c5-4efe-9ab2-9c4a83d57c7dGoodOld<p>Hi ....&nbsp;</p> <p>Found the issue. The definition needed to be like this:</p> <div style="background-color:#1f1f1f;color:#cccccc;font-family:Consolas, &#39;Courier New&#39;, monospace;font-size:14px;font-weight:normal;line-height:19px;white-space:pre;"> <div><span style="color:#569cd6;">/</span><span style="color:#cccccc;"> {</span></div> <div><span style="color:#cccccc;">&nbsp; &nbsp; </span><span style="color:#4ec9b0;">soc</span><span style="color:#cccccc;"> {</span></div> <div><span style="color:#cccccc;">&nbsp; &nbsp; &nbsp; &nbsp; </span><span style="color:#4ec9b0;">cpuapp_sram_ret:</span><span style="color:#cccccc;"> </span><span style="color:#4ec9b0;">memory</span><span style="color:#d4d4d4;">@</span><span style="color:#b5cea8;">2003f800</span><span style="color:#cccccc;"> {</span></div> <div><span style="color:#cccccc;">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; </span><span style="color:#9cdcfe;">compatible</span><span style="color:#cccccc;"> </span><span style="color:#d4d4d4;">=</span><span style="color:#cccccc;"> </span><span style="color:#569cd6;">&quot;zephyr,memory-region&quot;</span><span style="color:#cccccc;">, </span><span style="color:#569cd6;">&quot;mmio-sram&quot;</span><span style="color:#cccccc;">;</span></div> <div><span style="color:#cccccc;">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; </span><span style="color:#9cdcfe;">reg</span><span style="color:#cccccc;"> </span><span style="color:#d4d4d4;">=</span><span style="color:#cccccc;"> &lt;</span><span style="color:#b5cea8;">0x2003F800</span><span style="color:#cccccc;"> </span><span style="color:#569cd6;">DT_SIZE_K</span><span style="color:#cccccc;">(</span><span style="color:#b5cea8;">2</span><span style="color:#cccccc;">)&gt;;</span></div> <div><span style="color:#cccccc;">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; </span><span style="color:#9cdcfe;">#address-cells</span><span style="color:#cccccc;"> </span><span style="color:#d4d4d4;">=</span><span style="color:#cccccc;"> &lt;</span><span style="color:#b5cea8;">1</span><span style="color:#cccccc;">&gt;;</span></div> <div><span style="color:#cccccc;">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; </span><span style="color:#9cdcfe;">#size-cells</span><span style="color:#cccccc;"> </span><span style="color:#d4d4d4;">=</span><span style="color:#cccccc;"> &lt;</span><span style="color:#b5cea8;">1</span><span style="color:#cccccc;">&gt;;</span></div> <div><span style="color:#cccccc;">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; </span><span style="color:#9cdcfe;">ranges</span><span style="color:#cccccc;"> </span><span style="color:#d4d4d4;">=</span><span style="color:#cccccc;"> &lt;</span><span style="color:#b5cea8;">0x0</span><span style="color:#cccccc;"> </span><span style="color:#b5cea8;">0x2003f800</span><span style="color:#cccccc;"> </span><span style="color:#569cd6;">DT_SIZE_K</span><span style="color:#cccccc;">(</span><span style="color:#b5cea8;">2</span><span style="color:#cccccc;">)&gt;;</span></div> <div><span style="color:#cccccc;">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; </span><span style="color:#9cdcfe;">zephyr,memory-region</span><span style="color:#cccccc;"> </span><span style="color:#d4d4d4;">=</span><span style="color:#cccccc;"> </span><span style="color:#ce9178;">&quot;Retained&quot;</span><span style="color:#cccccc;">;</span></div> <div><span style="color:#cccccc;">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; </span><span style="color:#9cdcfe;">status</span><span style="color:#cccccc;"> </span><span style="color:#d4d4d4;">=</span><span style="color:#cccccc;"> </span><span style="color:#569cd6;">&quot;okay&quot;</span><span style="color:#cccccc;">;</span></div> <br /> <div><span style="color:#cccccc;">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; </span><span style="color:#4ec9b0;">retained0:</span><span style="color:#cccccc;"> </span><span style="color:#4ec9b0;">retained0</span><span style="color:#cccccc;"> {</span></div> <div><span style="color:#cccccc;">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; </span><span style="color:#9cdcfe;">compatible</span><span style="color:#cccccc;"> </span><span style="color:#d4d4d4;">=</span><span style="color:#cccccc;"> </span><span style="color:#569cd6;">&quot;zephyr,retained-ram&quot;</span><span style="color:#cccccc;">;</span></div> <div><span style="color:#cccccc;">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; </span><span style="color:#9cdcfe;">status</span><span style="color:#cccccc;"> </span><span style="color:#d4d4d4;">=</span><span style="color:#cccccc;"> </span><span style="color:#569cd6;">&quot;okay&quot;</span><span style="color:#cccccc;">;</span></div> <div><span style="color:#cccccc;">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; };</span></div> <div><span style="color:#cccccc;">&nbsp; &nbsp; &nbsp; &nbsp; };</span></div> <div><span style="color:#cccccc;">&nbsp; &nbsp; };</span></div> <div><span style="color:#cccccc;">};</span></div> </div> <p></p> <p>Please do not make a ticket for this. :-)&nbsp;</p><div style="clear:both;"></div>