diff --git a/boards/arm/lpc17xx_40xx/lx_cpu/configs/nsh/defconfig b/boards/arm/lpc17xx_40xx/lx_cpu/configs/nsh/defconfig
index 647191b864..641defb344 100644
--- a/boards/arm/lpc17xx_40xx/lx_cpu/configs/nsh/defconfig
+++ b/boards/arm/lpc17xx_40xx/lx_cpu/configs/nsh/defconfig
@@ -97,7 +97,7 @@ CONFIG_MAX_TASKS=16
 CONFIG_MAX_WDOGPARMS=2
 CONFIG_MMCSD=y
 CONFIG_MMCSD_SDIO=y
-CONFIG_MM_REGIONS=3
+CONFIG_MM_REGIONS=2
 CONFIG_MTD=y
 CONFIG_MTD_M25P=y
 CONFIG_NETDB_DNSCLIENT=y
diff --git a/boards/arm/lpc17xx_40xx/olimex-lpc1766stk/configs/hidmouse/defconfig b/boards/arm/lpc17xx_40xx/olimex-lpc1766stk/configs/hidmouse/defconfig
index 7729a6035d..049752fc75 100644
--- a/boards/arm/lpc17xx_40xx/olimex-lpc1766stk/configs/hidmouse/defconfig
+++ b/boards/arm/lpc17xx_40xx/olimex-lpc1766stk/configs/hidmouse/defconfig
@@ -33,7 +33,6 @@ CONFIG_LPC17_40_UART0=y
 CONFIG_LPC17_40_USBHOST=y
 CONFIG_MAX_TASKS=16
 CONFIG_MAX_WDOGPARMS=2
-CONFIG_MM_REGIONS=2
 CONFIG_NET=y
 CONFIG_NETDB_DNSCLIENT=y
 CONFIG_NETDB_DNSSERVER_NOADDR=y
diff --git a/boards/arm/lpc17xx_40xx/open1788/configs/fb/defconfig b/boards/arm/lpc17xx_40xx/open1788/configs/fb/defconfig
index f0d39506cc..faf44a5d04 100644
--- a/boards/arm/lpc17xx_40xx/open1788/configs/fb/defconfig
+++ b/boards/arm/lpc17xx_40xx/open1788/configs/fb/defconfig
@@ -31,7 +31,7 @@ CONFIG_MAX_TASKS=16
 CONFIG_MAX_WDOGPARMS=2
 CONFIG_MMCSD=y
 CONFIG_MMCSD_SDIO=y
-CONFIG_MM_REGIONS=2
+CONFIG_MM_REGIONS=3
 CONFIG_NFILE_DESCRIPTORS=8
 CONFIG_NFILE_STREAMS=8
 CONFIG_NX=y
diff --git a/boards/arm/lpc17xx_40xx/open1788/configs/knxterm/defconfig b/boards/arm/lpc17xx_40xx/open1788/configs/knxterm/defconfig
index acad40fbe3..d6409cff90 100644
--- a/boards/arm/lpc17xx_40xx/open1788/configs/knxterm/defconfig
+++ b/boards/arm/lpc17xx_40xx/open1788/configs/knxterm/defconfig
@@ -39,7 +39,7 @@ CONFIG_MAX_TASKS=16
 CONFIG_MAX_WDOGPARMS=2
 CONFIG_MMCSD=y
 CONFIG_MMCSD_SDIO=y
-CONFIG_MM_REGIONS=2
+CONFIG_MM_REGIONS=3
 CONFIG_MQ_MAXMSGSIZE=64
 CONFIG_NFILE_DESCRIPTORS=8
 CONFIG_NFILE_STREAMS=8
diff --git a/boards/arm/lpc17xx_40xx/open1788/configs/nxlines/defconfig b/boards/arm/lpc17xx_40xx/open1788/configs/nxlines/defconfig
index 741c90f2cf..f9b57ebd44 100644
--- a/boards/arm/lpc17xx_40xx/open1788/configs/nxlines/defconfig
+++ b/boards/arm/lpc17xx_40xx/open1788/configs/nxlines/defconfig
@@ -34,7 +34,7 @@ CONFIG_MAX_TASKS=16
 CONFIG_MAX_WDOGPARMS=2
 CONFIG_MMCSD=y
 CONFIG_MMCSD_SDIO=y
-CONFIG_MM_REGIONS=2
+CONFIG_MM_REGIONS=3
 CONFIG_MQ_MAXMSGSIZE=64
 CONFIG_NFILE_DESCRIPTORS=8
 CONFIG_NFILE_STREAMS=8
diff --git a/boards/arm/lpc17xx_40xx/open1788/configs/pdcurses/defconfig b/boards/arm/lpc17xx_40xx/open1788/configs/pdcurses/defconfig
index d160413e2c..eedf5691cb 100644
--- a/boards/arm/lpc17xx_40xx/open1788/configs/pdcurses/defconfig
+++ b/boards/arm/lpc17xx_40xx/open1788/configs/pdcurses/defconfig
@@ -42,7 +42,7 @@ CONFIG_MAX_TASKS=16
 CONFIG_MAX_WDOGPARMS=2
 CONFIG_MMCSD=y
 CONFIG_MMCSD_SDIO=y
-CONFIG_MM_REGIONS=2
+CONFIG_MM_REGIONS=3
 CONFIG_NFILE_DESCRIPTORS=8
 CONFIG_NFILE_STREAMS=8
 CONFIG_NSH_ARCHINIT=y
diff --git a/boards/arm/sam34/sam3u-ek/configs/knsh/defconfig b/boards/arm/sam34/sam3u-ek/configs/knsh/defconfig
index abece7e48b..94cb237b23 100644
--- a/boards/arm/sam34/sam3u-ek/configs/knsh/defconfig
+++ b/boards/arm/sam34/sam3u-ek/configs/knsh/defconfig
@@ -27,7 +27,7 @@ CONFIG_FS_FAT=y
 CONFIG_MAX_TASKS=16
 CONFIG_MAX_WDOGPARMS=2
 CONFIG_MMCSD=y
-CONFIG_MM_REGIONS=2
+CONFIG_MM_REGIONS=3
 CONFIG_NFILE_DESCRIPTORS=8
 CONFIG_NFILE_STREAMS=8
 CONFIG_NSH_DISABLE_DD=y
diff --git a/boards/arm/sam34/sam3u-ek/configs/nsh/defconfig b/boards/arm/sam34/sam3u-ek/configs/nsh/defconfig
index 805fab2c61..4ff7de3ee9 100644
--- a/boards/arm/sam34/sam3u-ek/configs/nsh/defconfig
+++ b/boards/arm/sam34/sam3u-ek/configs/nsh/defconfig
@@ -24,7 +24,7 @@ CONFIG_BUILTIN=y
 CONFIG_FS_FAT=y
 CONFIG_MAX_TASKS=16
 CONFIG_MAX_WDOGPARMS=2
-CONFIG_MM_REGIONS=2
+CONFIG_MM_REGIONS=3
 CONFIG_NFILE_DESCRIPTORS=8
 CONFIG_NFILE_STREAMS=8
 CONFIG_NSH_ARCHINIT=y
diff --git a/boards/arm/sam34/sam3u-ek/configs/nx/defconfig b/boards/arm/sam34/sam3u-ek/configs/nx/defconfig
index 24354afa29..6c4c2eb44b 100644
--- a/boards/arm/sam34/sam3u-ek/configs/nx/defconfig
+++ b/boards/arm/sam34/sam3u-ek/configs/nx/defconfig
@@ -40,7 +40,7 @@ CONFIG_LCD_MAXPOWER=31
 CONFIG_LCD_PORTRAIT=y
 CONFIG_MAX_TASKS=16
 CONFIG_MAX_WDOGPARMS=2
-CONFIG_MM_REGIONS=2
+CONFIG_MM_REGIONS=3
 CONFIG_MQ_MAXMSGSIZE=64
 CONFIG_NFILE_DESCRIPTORS=12
 CONFIG_NFILE_STREAMS=12
diff --git a/boards/arm/sam34/sam3u-ek/configs/nxwm/defconfig b/boards/arm/sam34/sam3u-ek/configs/nxwm/defconfig
index cebc4926c9..0bedeef845 100644
--- a/boards/arm/sam34/sam3u-ek/configs/nxwm/defconfig
+++ b/boards/arm/sam34/sam3u-ek/configs/nxwm/defconfig
@@ -36,7 +36,7 @@ CONFIG_LCD_MAXCONTRAST=1
 CONFIG_LCD_MAXPOWER=31
 CONFIG_MAX_TASKS=16
 CONFIG_MAX_WDOGPARMS=2
-CONFIG_MM_REGIONS=2
+CONFIG_MM_REGIONS=3
 CONFIG_MQ_MAXMSGSIZE=64
 CONFIG_NFILE_DESCRIPTORS=12
 CONFIG_NFILE_STREAMS=12
diff --git a/boards/arm/stm32l4/b-l475e-iot01a/configs/nsh/defconfig b/boards/arm/stm32l4/b-l475e-iot01a/configs/nsh/defconfig
index e9fb11c1ea..13d38fa3f6 100644
--- a/boards/arm/stm32l4/b-l475e-iot01a/configs/nsh/defconfig
+++ b/boards/arm/stm32l4/b-l475e-iot01a/configs/nsh/defconfig
@@ -26,7 +26,6 @@ CONFIG_HAVE_CXXINITIALIZE=y
 CONFIG_INTELHEX_BINARY=y
 CONFIG_MAX_TASKS=16
 CONFIG_MAX_WDOGPARMS=2
-CONFIG_MM_REGIONS=2
 CONFIG_MTD_SMART_SECTOR_SIZE=512
 CONFIG_MX25RXX_SECTOR512=y
 CONFIG_NFILE_DESCRIPTORS=8
diff --git a/boards/arm/stm32l4/b-l475e-iot01a/configs/spirit-6lowpan/defconfig b/boards/arm/stm32l4/b-l475e-iot01a/configs/spirit-6lowpan/defconfig
index 4cdec3fcad..b5edabc16c 100644
--- a/boards/arm/stm32l4/b-l475e-iot01a/configs/spirit-6lowpan/defconfig
+++ b/boards/arm/stm32l4/b-l475e-iot01a/configs/spirit-6lowpan/defconfig
@@ -48,7 +48,6 @@ CONFIG_LIBM=y
 CONFIG_LIB_HOSTNAME="B-L475E-IOT01A"
 CONFIG_MAX_TASKS=16
 CONFIG_MAX_WDOGPARMS=2
-CONFIG_MM_REGIONS=2
 CONFIG_NET=y
 CONFIG_NETDEVICES=y
 CONFIG_NETDEV_LATEINIT=y
diff --git a/boards/arm/stm32l4/b-l475e-iot01a/configs/spirit-starhub/defconfig b/boards/arm/stm32l4/b-l475e-iot01a/configs/spirit-starhub/defconfig
index 9c14e5aa53..6c0929f36c 100644
--- a/boards/arm/stm32l4/b-l475e-iot01a/configs/spirit-starhub/defconfig
+++ b/boards/arm/stm32l4/b-l475e-iot01a/configs/spirit-starhub/defconfig
@@ -37,7 +37,6 @@ CONFIG_LIBM=y
 CONFIG_LIB_HOSTNAME="B-L475E-IOT01A"
 CONFIG_MAX_TASKS=16
 CONFIG_MAX_WDOGPARMS=2
-CONFIG_MM_REGIONS=2
 CONFIG_NET=y
 CONFIG_NETDEVICES=y
 CONFIG_NETDEV_LATEINIT=y
diff --git a/boards/arm/stm32l4/b-l475e-iot01a/configs/spirit-starpoint/defconfig b/boards/arm/stm32l4/b-l475e-iot01a/configs/spirit-starpoint/defconfig
index 386aa41ab1..34941746cf 100644
--- a/boards/arm/stm32l4/b-l475e-iot01a/configs/spirit-starpoint/defconfig
+++ b/boards/arm/stm32l4/b-l475e-iot01a/configs/spirit-starpoint/defconfig
@@ -49,7 +49,6 @@ CONFIG_LIBM=y
 CONFIG_LIB_HOSTNAME="B-L475E-IOT01A"
 CONFIG_MAX_TASKS=16
 CONFIG_MAX_WDOGPARMS=2
-CONFIG_MM_REGIONS=2
 CONFIG_NET=y
 CONFIG_NETDEVICES=y
 CONFIG_NETDEV_LATEINIT=y