diff --git a/boards/nxp/fmuk66-e/nuttx-config/nsh/defconfig b/boards/nxp/fmuk66-e/nuttx-config/nsh/defconfig
index 2c70237b97..2e857022d7 100644
--- a/boards/nxp/fmuk66-e/nuttx-config/nsh/defconfig
+++ b/boards/nxp/fmuk66-e/nuttx-config/nsh/defconfig
@@ -23,11 +23,9 @@ CONFIG_ARCH_STACKDUMP=y
 CONFIG_ARMV7M_MEMCPY=y
 CONFIG_ARMV7M_USEBASEPRI=y
 CONFIG_BOARDCTL_RESET=y
-CONFIG_BOARDCTL=y
 CONFIG_BOARD_LOOPSPERMSEC=15175
 CONFIG_BOARD_RESET_ON_ASSERT=2
 CONFIG_BUILTIN=y
-CONFIG_C99_BOOL8=y
 CONFIG_CDCACM=y
 CONFIG_CDCACM_BULKIN_REQLEN=96
 CONFIG_CDCACM_PRODUCTID=0x001c
@@ -36,7 +34,6 @@ CONFIG_CDCACM_RXBUFSIZE=600
 CONFIG_CDCACM_TXBUFSIZE=8000
 CONFIG_CDCACM_VENDORID=0x1FC9
 CONFIG_CDCACM_VENDORSTR="NXP SEMICONDUCTORS"
-CONFIG_CLOCK_MONOTONIC=y
 CONFIG_DEBUG_FULLOPT=y
 CONFIG_DEBUG_HARDFAULT_ALERT=y
 CONFIG_DEBUG_SYMBOLS=y
@@ -62,6 +59,8 @@ CONFIG_HAVE_CXX=y
 CONFIG_HAVE_CXXINITIALIZE=y
 CONFIG_I2C_RESET=y
 CONFIG_IDLETHREAD_STACKSIZE=750
+CONFIG_INIT_ENTRYPOINT="nsh_main"
+CONFIG_INIT_STACKSIZE=2944
 CONFIG_IOB_NBUFFERS=24
 CONFIG_IOB_THROTTLE=0
 CONFIG_KINETIS_ADC0=y
@@ -112,7 +111,7 @@ CONFIG_KINETIS_UART_EXTEDED_BREAK=y
 CONFIG_KINETIS_UART_INVERT=y
 CONFIG_KINETIS_USBDCD=y
 CONFIG_KINETS_LPUART_LOWEST=y
-CONFIG_LIBC_FLOATINGPOINT=y
+CONFIG_LIBC_MAX_EXITFUNS=1
 CONFIG_LIBC_STRERROR=y
 CONFIG_LPUART0_BAUD=57600
 CONFIG_LPUART0_SERIAL_CONSOLE=y
@@ -178,7 +177,6 @@ CONFIG_RAM_SIZE=262144
 CONFIG_RAM_START=0x1fff0000
 CONFIG_RAW_BINARY=y
 CONFIG_RTC=y
-CONFIG_LIBC_MAX_EXITFUNS=1
 CONFIG_SCHED_HPWORK=y
 CONFIG_SCHED_HPWORKPRIORITY=249
 CONFIG_SCHED_HPWORKSTACKSIZE=1280
@@ -188,9 +186,9 @@ CONFIG_SCHED_INSTRUMENTATION_SWITCH=y
 CONFIG_SCHED_LPWORKPRIORITY=50
 CONFIG_SCHED_LPWORKSTACKSIZE=1632
 CONFIG_SCHED_WAITPID=y
-CONFIG_SDCLONE_DISABLE=y
 CONFIG_SEM_PREALLOCHOLDERS=32
 CONFIG_SERIAL_IFLOWCONTROL_WATERMARKS=y
+CONFIG_SERIAL_TERMIOS=y
 CONFIG_SIG_DEFAULT=y
 CONFIG_SIG_SIGALRM_ACTION=y
 CONFIG_SIG_SIGUSR1_ACTION=y
@@ -224,6 +222,4 @@ CONFIG_USBDEV_BUSPOWERED=y
 CONFIG_USBDEV_DUALSPEED=y
 CONFIG_USBDEV_MAXPOWER=500
 CONFIG_USEC_PER_TICK=1000
-CONFIG_INIT_STACKSIZE=2944
-CONFIG_INIT_ENTRYPOINT="nsh_main"
 CONFIG_WATCHDOG=y
diff --git a/boards/nxp/fmuk66-e/nuttx-config/socketcan/defconfig b/boards/nxp/fmuk66-e/nuttx-config/socketcan/defconfig
index d5a0cd70f4..1f51b3a8ba 100644
--- a/boards/nxp/fmuk66-e/nuttx-config/socketcan/defconfig
+++ b/boards/nxp/fmuk66-e/nuttx-config/socketcan/defconfig
@@ -191,6 +191,7 @@ CONFIG_SCHED_WAITPID=y
 CONFIG_SDCLONE_DISABLE=y
 CONFIG_SEM_PREALLOCHOLDERS=32
 CONFIG_SERIAL_IFLOWCONTROL_WATERMARKS=y
+CONFIG_SERIAL_TERMIOS=y
 CONFIG_SIG_DEFAULT=y
 CONFIG_SIG_SIGALRM_ACTION=y
 CONFIG_SIG_SIGUSR1_ACTION=y
diff --git a/boards/nxp/fmuk66-v3/nuttx-config/nsh/defconfig b/boards/nxp/fmuk66-v3/nuttx-config/nsh/defconfig
index 5462c41219..6bd4c9bac3 100644
--- a/boards/nxp/fmuk66-v3/nuttx-config/nsh/defconfig
+++ b/boards/nxp/fmuk66-v3/nuttx-config/nsh/defconfig
@@ -191,6 +191,7 @@ CONFIG_SCHED_LPWORKSTACKSIZE=1632
 CONFIG_SCHED_WAITPID=y
 CONFIG_SEM_PREALLOCHOLDERS=32
 CONFIG_SERIAL_IFLOWCONTROL_WATERMARKS=y
+CONFIG_SERIAL_TERMIOS=y
 CONFIG_SIG_DEFAULT=y
 CONFIG_SIG_SIGALRM_ACTION=y
 CONFIG_SIG_SIGUSR1_ACTION=y
diff --git a/boards/nxp/fmuk66-v3/nuttx-config/socketcan/defconfig b/boards/nxp/fmuk66-v3/nuttx-config/socketcan/defconfig
index d94eabcbc0..26e515751a 100644
--- a/boards/nxp/fmuk66-v3/nuttx-config/socketcan/defconfig
+++ b/boards/nxp/fmuk66-v3/nuttx-config/socketcan/defconfig
@@ -190,6 +190,7 @@ CONFIG_SCHED_WAITPID=y
 CONFIG_SDCLONE_DISABLE=y
 CONFIG_SEM_PREALLOCHOLDERS=32
 CONFIG_SERIAL_IFLOWCONTROL_WATERMARKS=y
+CONFIG_SERIAL_TERMIOS=y
 CONFIG_SIG_DEFAULT=y
 CONFIG_SIG_SIGALRM_ACTION=y
 CONFIG_SIG_SIGUSR1_ACTION=y
diff --git a/boards/nxp/fmuk66-v3/nuttx-config/test/defconfig b/boards/nxp/fmuk66-v3/nuttx-config/test/defconfig
index 76fd78cbec..571c937aa4 100644
--- a/boards/nxp/fmuk66-v3/nuttx-config/test/defconfig
+++ b/boards/nxp/fmuk66-v3/nuttx-config/test/defconfig
@@ -189,6 +189,7 @@ CONFIG_SCHED_WAITPID=y
 CONFIG_SDCLONE_DISABLE=y
 CONFIG_SEM_PREALLOCHOLDERS=32
 CONFIG_SERIAL_IFLOWCONTROL_WATERMARKS=y
+CONFIG_SERIAL_TERMIOS=y
 CONFIG_SIG_DEFAULT=y
 CONFIG_SIG_SIGALRM_ACTION=y
 CONFIG_SIG_SIGUSR1_ACTION=y
diff --git a/platforms/nuttx/NuttX/nuttx b/platforms/nuttx/NuttX/nuttx
index 85bd35b8b9..b8b541fbf5 160000
--- a/platforms/nuttx/NuttX/nuttx
+++ b/platforms/nuttx/NuttX/nuttx
@@ -1 +1 @@
-Subproject commit 85bd35b8b906dcd87425107ff6ab2119b2c0d451
+Subproject commit b8b541fbf5c75f13387560bb0639a4a5b27ec881