Disable external NOR flash on Aludel Mini board

Signed-off-by: Chris Wilson <chris@cgnd.dev>

CHANGELOG.md

@@ -7,6 +7,12 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [Unreleased]
+
+### Changed
+
+- Disable external NOR flash (`CONFIG_SPI_NOR=n`) on the `aludel_mini_v1_sparkfun9160 board` to fix a conflict with the SPI3 peripheral.
+
 ## [1.0.1] - 2023-09-01
 
 ### Fixed

boards/arm/aludel_mini_v1_sparkfun9160/aludel_mini_v1_sparkfun9160_mcuboot.conf

@@ -15,4 +15,18 @@ CONFIG_BOOT_SERIAL_DETECT_DELAY=450
 CONFIG_MCUBOOT_INDICATION_LED=y
 
 # Size of mcuboot partition
-CONFIG_SIZE_OPTIMIZATIONS=y
+CONFIG_SIZE_OPTIMIZATIONS=y
+
+# This disables the external NOR flash in mcuboot.
+#
+# On ncs >= v2.4.0, the w25q32jv node in the the devicetree for the
+# aludel_mini_v1_sparkfun9160 board automatically enables SPI_NOR (due to
+# compatible = "jedec,spi-nor") which uses the SPI3 peripheral.
+#
+# Some reference designs (such as the CAN Asset Tracker) remap the SPI3
+# peripheral to the Click headers on the the aludel_mini_v1_sparkfun9160 board.
+# If CONFIG_SPI_NOR is enabled, it breaks the SPI3 functionality in the app.
+#
+# Since we're not currently using the external NOR flash in mcuboot, we'll
+# just disable the external NOR flash for now until we find a better fix.
+CONFIG_SPI_NOR=n