diff --git a/configs/olimex-stm32-p407/README.txt b/configs/olimex-stm32-p407/README.txt
index 084ccb42837..b8c7bc75464 100644
--- a/configs/olimex-stm32-p407/README.txt
+++ b/configs/olimex-stm32-p407/README.txt
@@ -155,7 +155,7 @@ OTGFS Host
     CONFIG_STM32_SYSCFG    - Needed
     CONFIG_SCHED_WORKQUEUE - Worker thread support is required
 
-  Options:
+  STM32 Options:
 
     CONFIG_STM32_OTGFS_RXFIFO_SIZE - Size of the RX FIFO in 32-bit words.
       Default 128 (512 bytes)
@@ -171,11 +171,25 @@ OTGFS Host
     CONFIG_STM32_USBHOST_PKTDUMP - Dump all incoming and outgoing USB
       packets. Depends on CONFIG_DEBUG_FEATURES.
 
+   Olimex STM32 P407 Configuration:
+
+     CONFIG_STM32F4DISCO_OLIMEXP407_PRIO - Priority of the USB host watier
+       thread (default 100).
+     CONFIG_STM32F4DISCO_OLIMEXP407_STACKSIZE - Stacksize of the USB host
+       waiter thread (default 1024)
+
   Class Driver Configuration
   --------------------------
   Individual class drivers have additional configuration requirements.  The
   USB mass storage class, for example, requires FAT file system support.
 
+    CONFIG_USBHOST_MSC=y
+
+    CONFIG_FS_FAT=y
+    CONFIG_FAT_LCNAMES=y
+    CONFIG_FAT_LFN=y
+    CONFIG_FAT_MAXFNAME=32
+
 Configurations
 ==============
 
@@ -321,7 +335,13 @@ must be is one of the following.
 
     NOTES:
 
-    1. Kernel Modules / Shared Libraries
+    1. USB host support for USB FLASH sticks is enbabled.  See the notes
+       above under "OTGFS Host".
+
+       STATUS: I have seen this work with some FLASH sticks but not with
+       others.  This probably needs a little TLC to get 100% reliable.
+
+    2. Kernel Modules / Shared Libraries
 
        I used this configuration for testing NuttX kernel modules in the
        FLAT build with the following configuration additions to the
diff --git a/configs/olimex-stm32-p407/nsh/defconfig b/configs/olimex-stm32-p407/nsh/defconfig
index 12b7a82ce6d..45004a1ec7f 100644
--- a/configs/olimex-stm32-p407/nsh/defconfig
+++ b/configs/olimex-stm32-p407/nsh/defconfig
@@ -152,6 +152,9 @@ CONFIG_ARMV7M_HAVE_STACKCHECK=y
 # CONFIG_ARMV7M_STACKCHECK is not set
 # CONFIG_ARMV7M_ITMSYSLOG is not set
 # CONFIG_SERIAL_TERMIOS is not set
+# CONFIG_USBHOST_BULK_DISABLE is not set
+# CONFIG_USBHOST_INT_DISABLE is not set
+# CONFIG_USBHOST_ISOC_DISABLE is not set
 
 #
 # STM32 Configuration Options
@@ -410,7 +413,7 @@ CONFIG_STM32_HAVE_SPI3=y
 # CONFIG_STM32_I2C1 is not set
 # CONFIG_STM32_I2C2 is not set
 # CONFIG_STM32_I2C3 is not set
-# CONFIG_STM32_OTGFS is not set
+CONFIG_STM32_OTGFS=y
 # CONFIG_STM32_OTGHS is not set
 CONFIG_STM32_PWR=y
 # CONFIG_STM32_RNG is not set
@@ -500,6 +503,11 @@ CONFIG_STM32_USART3_SERIALDRIVER=y
 #
 # USB FS Host Configuration
 #
+CONFIG_STM32_OTGFS_RXFIFO_SIZE=128
+CONFIG_STM32_OTGFS_NPTXFIFO_SIZE=96
+CONFIG_STM32_OTGFS_PTXFIFO_SIZE=128
+CONFIG_STM32_OTGFS_DESCSIZE=128
+# CONFIG_STM32_OTGFS_SOFINTR is not set
 
 #
 # USB HS Host Configuration
@@ -594,6 +602,8 @@ CONFIG_ARCH_IRQBUTTONS=y
 #
 # Board-Specific Options
 #
+CONFIG_STM32F4DISCO_OLIMEXP407_STACKSIZE=1024
+CONFIG_STM32F4DISCO_OLIMEXP407_PRIO=100
 # CONFIG_BOARD_CRASHDUMP is not set
 CONFIG_LIB_BOARDCTL=y
 # CONFIG_BOARDCTL_RESET is not set
@@ -834,7 +844,17 @@ CONFIG_USART3_2STOP=0
 # CONFIG_USART3_DMA is not set
 # CONFIG_PSEUDOTERM is not set
 # CONFIG_USBDEV is not set
-# CONFIG_USBHOST is not set
+CONFIG_USBHOST=y
+CONFIG_USBHOST_NPREALLOC=4
+CONFIG_USBHOST_HAVE_ASYNCH=y
+# CONFIG_USBHOST_ASYNCH is not set
+# CONFIG_USBHOST_HUB is not set
+# CONFIG_USBHOST_COMPOSITE is not set
+CONFIG_USBHOST_MSC=y
+# CONFIG_USBHOST_CDCACM is not set
+# CONFIG_USBHOST_HIDKBD is not set
+# CONFIG_USBHOST_HIDMOUSE is not set
+# CONFIG_USBHOST_TRACE is not set
 # CONFIG_HAVE_USBTRACE is not set
 # CONFIG_DRIVERS_WIRELESS is not set
 # CONFIG_DRIVERS_CONTACTLESS is not set
@@ -877,11 +897,18 @@ CONFIG_SYSLOG_CONSOLE=y
 # CONFIG_DISABLE_PSEUDOFS_OPERATIONS is not set
 # CONFIG_PSEUDOFS_SOFTLINKS is not set
 CONFIG_FS_READABLE=y
-# CONFIG_FS_WRITABLE is not set
+CONFIG_FS_WRITABLE=y
 # CONFIG_FS_NAMED_SEMAPHORES is not set
 CONFIG_FS_MQUEUE_MPATH="/var/mqueue"
 # CONFIG_FS_RAMMAP is not set
-# CONFIG_FS_FAT is not set
+CONFIG_FS_FAT=y
+CONFIG_FAT_LCNAMES=y
+CONFIG_FAT_LFN=y
+CONFIG_FAT_MAXFNAME=32
+# CONFIG_FS_FATTIME is not set
+# CONFIG_FAT_FORCE_INDIRECT is not set
+# CONFIG_FAT_DMAMEMORY is not set
+# CONFIG_FAT_DIRECT_RETRY is not set
 # CONFIG_FS_NXFFS is not set
 # CONFIG_FS_ROMFS is not set
 # CONFIG_FS_TMPFS is not set
@@ -980,6 +1007,8 @@ CONFIG_ARCH_LOWPUTC=y
 #
 CONFIG_LIB_RAND_ORDER=1
 CONFIG_LIB_HOMEDIR="/"
+CONFIG_LIBC_TMPDIR="/tmp"
+CONFIG_LIBC_MAX_TMPFILE=32
 
 #
 # Program Execution Options
@@ -1078,6 +1107,7 @@ CONFIG_BUILTIN_PROXY_STACKSIZE=1024
 # CONFIG_EXAMPLES_CXXTEST is not set
 # CONFIG_EXAMPLES_DHCPD is not set
 # CONFIG_EXAMPLES_ELF is not set
+# CONFIG_EXAMPLES_FSTEST is not set
 # CONFIG_EXAMPLES_FTPC is not set
 # CONFIG_EXAMPLES_FTPD is not set
 # CONFIG_EXAMPLES_HELLO is not set
@@ -1214,6 +1244,7 @@ CONFIG_NSH_DISABLE_LOSMART=y
 # CONFIG_NSH_DISABLE_LS is not set
 # CONFIG_NSH_DISABLE_MB is not set
 # CONFIG_NSH_DISABLE_MKDIR is not set
+# CONFIG_NSH_DISABLE_MKFATFS is not set
 # CONFIG_NSH_DISABLE_MKRD is not set
 # CONFIG_NSH_DISABLE_MH is not set
 # CONFIG_NSH_DISABLE_MOUNT is not set