diff --git a/ports/zephyr/boards/nrf9151dk_nrf9151.conf b/ports/zephyr/boards/nrf9151dk_nrf9151.conf
new file mode 100644
index 0000000000000..e89f332ba13d0
--- /dev/null
+++ b/ports/zephyr/boards/nrf9151dk_nrf9151.conf
@@ -0,0 +1,7 @@
+# Enable external flash
+CONFIG_SPI=y
+CONFIG_SPI_NOR=y
+CONFIG_SPI_NOR_SFDP_DEVICETREE=y
+
+CONFIG_FLASH=y
+CONFIG_FLASH_MAP=y
diff --git a/ports/zephyr/boards/nrf9151dk_nrf9151.overlay b/ports/zephyr/boards/nrf9151dk_nrf9151.overlay
new file mode 100644
index 0000000000000..85cab574148fe
--- /dev/null
+++ b/ports/zephyr/boards/nrf9151dk_nrf9151.overlay
@@ -0,0 +1,22 @@
+/ {
+ /* Configure partition manager to use gd25wb256 as the external flash */
+ chosen {
+ nordic,pm-ext-flash = &gd25wb256;
+ };
+};
+
+/delete-node/ &storage_partition;
+
+&gd25wb256 {
+ status = "okay";
+ partitions {
+ compatible = "fixed-partitions";
+ #address-cells = <1>;
+ #size-cells = <1>;
+
+ storage_partition: partition@0 {
+ reg = <0x00000000 0x2000000>;
+ label = "storage";
+ };
+ };
+};
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