fix(nrf): corrects Adafruit Feather build and bootloader start address config

Author: RobertDaleSmith

app/boards/adafruit_feather_nrf52840.conf

@@ -2,16 +2,14 @@
 
 # Build UF2 by default, supported by the Adafruit nRF52 Bootloader
 CONFIG_BUILD_OUTPUT_UF2=y
+CONFIG_BOOTLOADER_MCUBOOT=n
 
 # Flash and partition support (required for custom partition layouts)
 CONFIG_FLASH=y
 CONFIG_FLASH_PAGE_LAYOUT=y
 CONFIG_FLASH_MAP=y
 CONFIG_USE_DT_CODE_PARTITION=y
 
-# Force flash base address to match UF2 target address
-CONFIG_FLASH_BASE_ADDRESS=0x26000
-
 # Re-enable BT settings with global pm_static.yml
 CONFIG_BT_SETTINGS=y
 
@@ -38,4 +36,4 @@ CONFIG_CLOCK_CONTROL_NRF=y
 
 # Enable HFXO for better timing accuracy (recommended by Nordic for WS2812)
 CONFIG_CLOCK_CONTROL_NRF_K32SRC_XTAL=y
-CONFIG_CLOCK_CONTROL_NRF_K32SRC_500PPM=y
+CONFIG_CLOCK_CONTROL_NRF_K32SRC_500PPM=y

app/boards/adafruit_feather_nrf52840.overlay

@@ -91,11 +91,6 @@
 	/* NeoPixel powered directly from 3.3V - no power enable needed */
 };
 
-/* Disable board's default CDC node if it exists */
-&board_cdc_acm_uart {
-	status = "disabled";
-};
-
 /* Add dual CDC ACM nodes */
 &zephyr_udc0 {
 	cdc_acm_uart0: cdc_acm_uart0 {
@@ -107,9 +102,13 @@
 		compatible = "zephyr,cdc-acm-uart";
 		label = "CDC_ACM_1";
 	};
+
+	board_cdc_acm_uart: board_cdc_acm_uart {
+		compatible = "zephyr,cdc-acm-uart";
+	};
 };
 
-/* Delete default MCUboot partitions and replace with UF2-compatible layout */
+/* Remove default partition map before defining UF2 layout */
 /delete-node/ &boot_partition;
 /delete-node/ &slot0_partition;
 /delete-node/ &slot1_partition;
@@ -137,10 +136,10 @@
 			reg = <0x00000000 0x00026000>;
 		};
 
-		code_partition: partition@26000 {
-			label = "code_partition";
-			reg = <0x00026000 0x000c6000>;
-		};
+	code_partition: partition@26000 {
+		label = "code_partition";
+		reg = <0x00026000 0x000c6000>;
+	};
 
 		storage_partition: partition@ec000 {
 			label = "storage";
@@ -159,4 +158,4 @@
 		zephyr,code-partition = &code_partition;
 		zephyr,settings-partition = &storage_partition;
 	};
-};
+};