diff --git a/soc/arm/Kconfig b/soc/arm/Kconfig
index 5be3950aeda..3043d088be8 100644
--- a/soc/arm/Kconfig
+++ b/soc/arm/Kconfig
@@ -41,6 +41,22 @@ config CPU_HAS_NRF_IDAU
 	  (IDAU: "Implementation-Defined Attribution Unit", in accordance with
 	  ARM terminology).
 
+if CPU_HAS_NRF_IDAU
+config NRF_SPU_FLASH_REGION_SIZE
+	hex
+	default 0x8000 if SOC_NRF9160
+	default 0x8000 if SOC_NRF5340_CPUAPP && NRF5340_CPUAPP_ERRATUM19
+	default 0x4000 if SOC_NRF5340_CPUAPP
+	help
+	  FLASH region size for the NRF_SPU peripheral
+
+config NRF_SPU_RAM_REGION_SIZE
+	hex
+	default 0x2000 if SOC_NRF9160 || SOC_NRF5340_CPUAPP
+	help
+	  RAM region size for the NRF_SPU peripheral
+endif
+
 config CPU_HAS_FPU_DOUBLE_PRECISION
 	bool
 	depends on CPU_CORTEX_M7