diff --git a/configs/stm32l476vg-disco/nsh/defconfig b/configs/stm32l476vg-disco/nsh/defconfig
index d377a00ef1..1a01f116f1 100644
--- a/configs/stm32l476vg-disco/nsh/defconfig
+++ b/configs/stm32l476vg-disco/nsh/defconfig
@@ -43,47 +43,6 @@ CONFIG_RAW_BINARY=y
 # Debug Options
 #
 CONFIG_DEBUG_ALERT=y
-CONFIG_DEBUG_FEATURES=y
-
-#
-# Debug SYSLOG Output Controls
-#
-# CONFIG_DEBUG_ERROR is not set
-# CONFIG_DEBUG_ASSERTIONS is not set
-
-#
-# Subsystem Debug Options
-#
-# CONFIG_DEBUG_BINFMT is not set
-# CONFIG_DEBUG_FS is not set
-# CONFIG_DEBUG_GRAPHICS is not set
-# CONFIG_DEBUG_LIB is not set
-# CONFIG_DEBUG_MM is not set
-# CONFIG_DEBUG_SCHED is not set
-
-#
-# OS Function Debug Options
-#
-# CONFIG_DEBUG_DMA is not set
-# CONFIG_DEBUG_IRQ is not set
-
-#
-# Driver Debug Options
-#
-# CONFIG_DEBUG_LEDS is not set
-# CONFIG_DEBUG_GPIO is not set
-# CONFIG_DEBUG_RTC is not set
-# CONFIG_DEBUG_SPI is not set
-CONFIG_DEBUG_USB=y
-CONFIG_ARCH_HAVE_STACKCHECK=y
-# CONFIG_STACK_COLORATION is not set
-CONFIG_ARCH_HAVE_HEAPCHECK=y
-# CONFIG_HEAP_COLORATION is not set
-CONFIG_DEBUG_SYMBOLS=y
-CONFIG_ARCH_HAVE_CUSTOMOPT=y
-CONFIG_DEBUG_NOOPT=y
-# CONFIG_DEBUG_CUSTOMOPT is not set
-# CONFIG_DEBUG_FULLOPT is not set
 
 #
 # System Type
@@ -229,7 +188,6 @@ CONFIG_STM32L4_DMA2=y
 #
 # AHB2 Peripherals
 #
-CONFIG_STM32L4_OTGFS=y
 # CONFIG_STM32L4_ADC1 is not set
 # CONFIG_STM32L4_ADC2 is not set
 # CONFIG_STM32L4_ADC3 is not set
@@ -343,7 +301,6 @@ CONFIG_ARCH_HAVE_RESET=y
 # CONFIG_ARCH_USE_MPU is not set
 # CONFIG_ARCH_IRQPRIO is not set
 CONFIG_ARCH_STACKDUMP=y
-CONFIG_ARCH_USBDUMP=y
 # CONFIG_ENDIAN_BIG is not set
 # CONFIG_ARCH_IDLE_CUSTOM is not set
 # CONFIG_ARCH_HAVE_RAMFUNCS is not set
@@ -408,7 +365,6 @@ CONFIG_LIB_BOARDCTL=y
 # CONFIG_BOARDCTL_RESET is not set
 CONFIG_BOARDCTL_UNIQUEID=y
 CONFIG_BOARDCTL_UNIQUEID_SIZE=12
-CONFIG_BOARDCTL_USBDEVCTRL=y
 # CONFIG_BOARDCTL_TSCTEST is not set
 # CONFIG_BOARDCTL_ADCTEST is not set
 # CONFIG_BOARDCTL_PWMTEST is not set
@@ -630,7 +586,6 @@ CONFIG_N25QXXX_SECTOR512=y
 # CONFIG_SERCOMM_CONSOLE is not set
 CONFIG_SERIAL=y
 # CONFIG_DEV_LOWCONSOLE is not set
-CONFIG_SERIAL_REMOVABLE=y
 CONFIG_SERIAL_CONSOLE=y
 # CONFIG_16550_UART is not set
 # CONFIG_UART_SERIALDRIVER is not set
@@ -678,52 +633,6 @@ CONFIG_USART2_2STOP=0
 # CONFIG_USART2_IFLOWCONTROL is not set
 # CONFIG_USART2_OFLOWCONTROL is not set
 # CONFIG_USART2_DMA is not set
-CONFIG_USBDEV=y
-
-#
-# USB Device Controller Driver Options
-#
-# CONFIG_USBDEV_ISOCHRONOUS is not set
-# CONFIG_USBDEV_DUALSPEED is not set
-CONFIG_USBDEV_SELFPOWERED=y
-# CONFIG_USBDEV_BUSPOWERED is not set
-CONFIG_USBDEV_MAXPOWER=100
-# CONFIG_USBDEV_DMA is not set
-# CONFIG_ARCH_USBDEV_STALLQUEUE is not set
-CONFIG_USBDEV_TRACE=y
-CONFIG_USBDEV_TRACE_NRECORDS=128
-CONFIG_USBDEV_TRACE_STRINGS=y
-CONFIG_USBDEV_TRACE_INITIALIDSET=y
-
-#
-# USB Device Class Driver Options
-#
-# CONFIG_USBDEV_COMPOSITE is not set
-# CONFIG_PL2303 is not set
-CONFIG_CDCACM=y
-# CONFIG_CDCACM_CONSOLE is not set
-CONFIG_CDCACM_EP0MAXPACKET=64
-CONFIG_CDCACM_EPINTIN=1
-CONFIG_CDCACM_EPINTIN_FSSIZE=64
-CONFIG_CDCACM_EPINTIN_HSSIZE=64
-CONFIG_CDCACM_EPBULKOUT=3
-CONFIG_CDCACM_EPBULKOUT_FSSIZE=64
-CONFIG_CDCACM_EPBULKOUT_HSSIZE=512
-CONFIG_CDCACM_EPBULKIN=2
-CONFIG_CDCACM_EPBULKIN_FSSIZE=64
-CONFIG_CDCACM_EPBULKIN_HSSIZE=512
-CONFIG_CDCACM_NRDREQS=4
-CONFIG_CDCACM_NWRREQS=4
-CONFIG_CDCACM_BULKIN_REQLEN=96
-CONFIG_CDCACM_RXBUFSIZE=257
-CONFIG_CDCACM_TXBUFSIZE=193
-CONFIG_CDCACM_VENDORID=0x0525
-CONFIG_CDCACM_PRODUCTID=0xa4a7
-CONFIG_CDCACM_VENDORSTR="NuttX"
-CONFIG_CDCACM_PRODUCTSTR="CDC/ACM Serial"
-# CONFIG_USBMSC is not set
-# CONFIG_USBHOST is not set
-# CONFIG_DRIVERS_WIRELESS is not set
 
 #
 # System Logging
@@ -798,7 +707,7 @@ CONFIG_FS_PROCFS_REGISTER=y
 # Memory Management
 #
 # CONFIG_MM_SMALL is not set
-CONFIG_MM_REGIONS=2
+CONFIG_MM_REGIONS=1
 # CONFIG_ARCH_HAVE_HEAP2 is not set
 # CONFIG_GRAN is not set
 
@@ -972,23 +881,8 @@ CONFIG_EXAMPLES_NSH_CXXINITIALIZE=y
 # CONFIG_EXAMPLES_TOUCHSCREEN is not set
 # CONFIG_EXAMPLES_WEBSERVER is not set
 # CONFIG_EXAMPLES_UNIONFS is not set
-CONFIG_EXAMPLES_USBSERIAL=y
-CONFIG_EXAMPLES_USBSERIAL_BUFSIZE=512
-CONFIG_EXAMPLES_USBSERIAL_TRACEINIT=y
-CONFIG_EXAMPLES_USBSERIAL_TRACECLASS=y
-CONFIG_EXAMPLES_USBSERIAL_TRACETRANSFERS=y
-CONFIG_EXAMPLES_USBSERIAL_TRACECONTROLLER=y
-CONFIG_EXAMPLES_USBSERIAL_TRACEINTERRUPTS=y
 # CONFIG_EXAMPLES_USBTERM is not set
 # CONFIG_EXAMPLES_WATCHDOG is not set
-CONFIG_EXAMPLES_USBSERIAL2=y
-CONFIG_EXAMPLES_USBSERIAL2_BUFSIZE=512
-CONFIG_EXAMPLES_USBSERIAL2_BUFSIZE=512
-CONFIG_EXAMPLES_USBSERIAL2_TRACEINIT=y
-CONFIG_EXAMPLES_USBSERIAL2_TRACECLASS=y
-CONFIG_EXAMPLES_USBSERIAL2_TRACETRANSFERS=y
-CONFIG_EXAMPLES_USBSERIAL2_TRACECONTROLLER=y
-CONFIG_EXAMPLES_USBSERIAL2_TRACEINTERRUPTS=y
 
 #
 # File System Utilities
@@ -1044,7 +938,7 @@ CONFIG_NSH_LINELEN=64
 # CONFIG_NSH_DISABLE_SEMICOLON is not set
 # CONFIG_NSH_CMDPARMS is not set
 CONFIG_NSH_MAXARGUMENTS=6
-CONFIG_NSH_ARGCAT=y
+# CONFIG_NSH_ARGCAT is not set
 CONFIG_NSH_NESTDEPTH=3
 # CONFIG_NSH_DISABLEBG is not set
 CONFIG_NSH_BUILTIN_APPS=y
@@ -1137,12 +1031,6 @@ CONFIG_NSH_CONSOLE=y
 #
 # USB Device Trace Support
 #
-CONFIG_NSH_USBDEV_TRACE=y
-CONFIG_NSH_USBDEV_TRACEINIT=y
-CONFIG_NSH_USBDEV_TRACECLASS=y
-CONFIG_NSH_USBDEV_TRACETRANSFERS=y
-CONFIG_NSH_USBDEV_TRACECONTROLLER=y
-CONFIG_NSH_USBDEV_TRACEINTERRUPTS=y
 CONFIG_NSH_ARCHINIT=y
 # CONFIG_NSH_LOGIN is not set
 # CONFIG_NSH_CONSOLE_LOGIN is not set
@@ -1179,4 +1067,3 @@ CONFIG_READLINE_ECHO=y
 # CONFIG_SYSTEM_UBLOXMODEM is not set
 # CONFIG_SYSTEM_USBMONITOR is not set
 # CONFIG_SYSTEM_ZMODEM is not set
-CONFIG_SYSTEM_DISCOTEST=y