diff --git a/configs/open1788/nsh/defconfig b/configs/open1788/nsh/defconfig
index 7a9e7468d5..4df82b880b 100644
--- a/configs/open1788/nsh/defconfig
+++ b/configs/open1788/nsh/defconfig
@@ -236,7 +236,7 @@ CONFIG_ARCH_STACKDUMP=y
 #
 # Board Settings
 #
-CONFIG_BOARD_LOOPSPERMSEC=11852
+CONFIG_BOARD_LOOPSPERMSEC=11934
 # CONFIG_ARCH_CALIBRATION is not set
 CONFIG_DRAM_START=0x10000000
 CONFIG_DRAM_SIZE=65536
diff --git a/configs/open1788/ostest/defconfig b/configs/open1788/ostest/defconfig
index 06d55f8771..d3b9a99ddb 100644
--- a/configs/open1788/ostest/defconfig
+++ b/configs/open1788/ostest/defconfig
@@ -223,7 +223,7 @@ CONFIG_ARCH_STACKDUMP=y
 #
 # Board Settings
 #
-CONFIG_BOARD_LOOPSPERMSEC=11852
+CONFIG_BOARD_LOOPSPERMSEC=11934
 # CONFIG_ARCH_CALIBRATION is not set
 CONFIG_DRAM_START=0x10000000
 CONFIG_DRAM_SIZE=65536
diff --git a/configs/sam3u-ek/knsh/defconfig b/configs/sam3u-ek/knsh/defconfig
index 567f1789e6..fa3c1502f9 100755
--- a/configs/sam3u-ek/knsh/defconfig
+++ b/configs/sam3u-ek/knsh/defconfig
@@ -161,7 +161,7 @@ CONFIG_DEBUG=n
 CONFIG_DEBUG_VERBOSE=n
 CONFIG_DEBUG_SYMBOLS=n
 CONFIG_NUTTX_KERNEL=y
-CONFIG_SYS_RESERVED=3
+CONFIG_SYS_RESERVED=4
 CONFIG_MM_REGIONS=3
 CONFIG_ARCH_LOWPUTC=y
 CONFIG_RR_INTERVAL=200