diff --git a/boards/arm/mimxrt595_evk/Kconfig.defconfig b/boards/arm/mimxrt595_evk/Kconfig.defconfig
index 25b34a8ab95..97f83227b5b 100644
--- a/boards/arm/mimxrt595_evk/Kconfig.defconfig
+++ b/boards/arm/mimxrt595_evk/Kconfig.defconfig
@@ -10,8 +10,6 @@ config BOARD
 
 config FLASH_MCUX_FLEXSPI_MX25UM51345G
 	default y if FLASH
-config FLASH_SIZE
-	default $(dt_node_int_prop_int,/soc/spi@134000/mx25um51345g@0,size,Kb)
 
 config FLASH_MCUX_FLEXSPI_XIP
 	default y if FLASH
diff --git a/boards/arm/mimxrt595_evk/mimxrt595_evk_cm33.dts b/boards/arm/mimxrt595_evk/mimxrt595_evk_cm33.dts
index 90380c966cb..9e7a41d8a3e 100644
--- a/boards/arm/mimxrt595_evk/mimxrt595_evk_cm33.dts
+++ b/boards/arm/mimxrt595_evk/mimxrt595_evk_cm33.dts
@@ -28,7 +28,7 @@
 	};
 
 	chosen {
-		zephyr,flash-controller = &flexspi;
+		zephyr,flash-controller = &mx25um51345g;
 		zephyr,flash = &mx25um51345g;
 		zephyr,code-partition = &slot0_partition;
 		zephyr,sram = &sram0;