diff --git a/configs/sam4s-xplained-pro/TODO.txt b/configs/sam4s-xplained-pro/TODO.txt
new file mode 100644
index 00000000000..03b1883822c
--- /dev/null
+++ b/configs/sam4s-xplained-pro/TODO.txt
@@ -0,0 +1,9 @@
+
+
+ - implement flash driver
+   - see arch/arm/src/stm32/stm32_flash.c and related
+     - both banks could be mapped with care taken not to erase the active code. 
+       - perhaps the MPU could block code corruption?
+       
+   - once implemented, the free() cmd replacement can show flash information. 
+
diff --git a/configs/sam4s-xplained-pro/nsh/defconfig b/configs/sam4s-xplained-pro/nsh/defconfig
index 14dba27702e..12a4402b12a 100644
--- a/configs/sam4s-xplained-pro/nsh/defconfig
+++ b/configs/sam4s-xplained-pro/nsh/defconfig
@@ -124,7 +124,8 @@ CONFIG_ARCH_CHIP="sam34"
 # CONFIG_ARMV7M_USEBASEPRI is not set
 # CONFIG_ARCH_HAVE_FPU is not set
 CONFIG_ARCH_HAVE_MPU=y
-# CONFIG_ARMV7M_MPU is not set
+CONFIG_ARMV7M_MPU=y
+CONFIG_ARMV7M_MPU_NREGIONS=8
 # CONFIG_DEBUG_HARDFAULT is not set
 
 #