diff --git a/boards/nxp/fmuk66-e/nuttx-config/nsh/defconfig b/boards/nxp/fmuk66-e/nuttx-config/nsh/defconfig
index f0a4c3fab7..f6f9859ade 100644
--- a/boards/nxp/fmuk66-e/nuttx-config/nsh/defconfig
+++ b/boards/nxp/fmuk66-e/nuttx-config/nsh/defconfig
@@ -39,6 +39,8 @@ CONFIG_DEBUG_HARDFAULT_ALERT=y
 CONFIG_DEBUG_SYMBOLS=y
 CONFIG_DEV_FIFO_SIZE=0
 CONFIG_DEV_PIPE_SIZE=70
+CONFIG_DISABLE_MQUEUE=y
+CONFIG_DISABLE_POSIX_TIMERS=y
 CONFIG_ETH0_PHY_TJA1100=y
 CONFIG_FAT_DMAMEMORY=y
 CONFIG_FAT_LCNAMES=y
@@ -114,8 +116,6 @@ CONFIG_MTD=y
 CONFIG_MTD_BYTE_WRITE=y
 CONFIG_MTD_PARTITION=y
 CONFIG_MTD_RAMTRON=y
-CONFIG_NETDB_DNSCLIENT=y
-CONFIG_NETDB_DNSSERVER_NOADDR=y
 CONFIG_NETDEV_PHY_IOCTL=y
 CONFIG_NETINIT_THREAD=y
 CONFIG_NETINIT_THREAD_PRIORITY=49
@@ -153,6 +153,7 @@ CONFIG_NSH_DISABLE_UNAME=y
 CONFIG_NSH_DISABLE_WGET=y
 CONFIG_NSH_DISABLE_XD=y
 CONFIG_NSH_FILEIOSIZE=512
+CONFIG_NSH_IOBUFFER_SIZE=256
 CONFIG_NSH_LINELEN=128
 CONFIG_NSH_MAXARGUMENTS=15
 CONFIG_NSH_NESTDEPTH=8
@@ -160,6 +161,8 @@ CONFIG_NSH_READLINE=y
 CONFIG_NSH_ROMFSETC=y
 CONFIG_NSH_ROMFSSECTSIZE=128
 CONFIG_NSH_STRERROR=y
+CONFIG_NSH_TELNETD_CLIENTSTACKSIZE=1280
+CONFIG_NSH_TELNETD_DAEMONSTACKSIZE=1024
 CONFIG_NSH_VARS=y
 CONFIG_PIPES=y
 CONFIG_PREALLOC_TIMERS=50
@@ -199,6 +202,10 @@ CONFIG_SYSTEM_CUTERM_DEFAULT_BAUD=57600
 CONFIG_SYSTEM_NSH=y
 CONFIG_SYSTEM_PING=y
 CONFIG_TASK_NAME_SIZE=24
+CONFIG_TELNET_IOTHREAD_STACKSIZE=512
+CONFIG_TELNET_MAXLCLIENTS=1
+CONFIG_TELNET_RXBUFFER_SIZE=128
+CONFIG_TELNET_TXBUFFER_SIZE=128
 CONFIG_UART0_IFLOWCONTROL=y
 CONFIG_UART0_OFLOWCONTROL=y
 CONFIG_UART1_RXBUFSIZE=600
diff --git a/boards/nxp/fmuk66-e/nuttx-config/socketcan/defconfig b/boards/nxp/fmuk66-e/nuttx-config/socketcan/defconfig
index 13f25a0b4a..d7aebf3d92 100644
--- a/boards/nxp/fmuk66-e/nuttx-config/socketcan/defconfig
+++ b/boards/nxp/fmuk66-e/nuttx-config/socketcan/defconfig
@@ -40,6 +40,8 @@ CONFIG_DEBUG_HARDFAULT_ALERT=y
 CONFIG_DEBUG_SYMBOLS=y
 CONFIG_DEV_FIFO_SIZE=0
 CONFIG_DEV_PIPE_SIZE=70
+CONFIG_DISABLE_MQUEUE=y
+CONFIG_DISABLE_POSIX_TIMERS=y
 CONFIG_ETH0_PHY_TJA1100=y
 CONFIG_FAT_DMAMEMORY=y
 CONFIG_FAT_LCNAMES=y
@@ -150,6 +152,7 @@ CONFIG_NSH_DISABLE_UNAME=y
 CONFIG_NSH_DISABLE_WGET=y
 CONFIG_NSH_DISABLE_XD=y
 CONFIG_NSH_FILEIOSIZE=512
+CONFIG_NSH_IOBUFFER_SIZE=256
 CONFIG_NSH_LINELEN=128
 CONFIG_NSH_MAXARGUMENTS=15
 CONFIG_NSH_NESTDEPTH=8
@@ -157,6 +160,8 @@ CONFIG_NSH_READLINE=y
 CONFIG_NSH_ROMFSETC=y
 CONFIG_NSH_ROMFSSECTSIZE=128
 CONFIG_NSH_STRERROR=y
+CONFIG_NSH_TELNETD_CLIENTSTACKSIZE=1280
+CONFIG_NSH_TELNETD_DAEMONSTACKSIZE=1024
 CONFIG_NSH_VARS=y
 CONFIG_PIPES=y
 CONFIG_PREALLOC_TIMERS=50
@@ -196,6 +201,10 @@ CONFIG_SYSTEM_CUTERM_DEFAULT_BAUD=57600
 CONFIG_SYSTEM_NSH=y
 CONFIG_SYSTEM_PING=y
 CONFIG_TASK_NAME_SIZE=24
+CONFIG_TELNET_IOTHREAD_STACKSIZE=512
+CONFIG_TELNET_MAXLCLIENTS=1
+CONFIG_TELNET_RXBUFFER_SIZE=128
+CONFIG_TELNET_TXBUFFER_SIZE=128
 CONFIG_UART0_IFLOWCONTROL=y
 CONFIG_UART0_OFLOWCONTROL=y
 CONFIG_UART1_RXBUFSIZE=600