sim/userfs: Add a configuration for testing the UserFS using apps/examples/userfs.

configs/sim/README.txt

@@ -1038,6 +1038,20 @@ unionfs
   You can see the files in the two file systems before they were unified at
   apps/examples/unionfs/atestdir and btestdir.
 
+userfs
+
+  This is another NSH configuration that includes the built-in application of apps/examples/userfs to support test of the UserFS on the simulation platform.
+
+  To use the test:
+
+    nsh> userfs                 # Mounts the UserFS test file system at
+                                # /mnt/ufstest
+    nsh> mount                  # Testing is then performed by exercising the
+                                # file system from the command line
+    nsh> ls -l /mnt/ufstest
+    nsh> cat /mnt/ufstest/File1
+    etc.
+
 ustream
 
   This is the same as the nsh configuration except that it includes

configs/sim/userfs/defconfig

@@ -0,0 +1,56 @@
+# CONFIG_NET_ETHERNET is not set
+# CONFIG_NET_IPv4 is not set
+# CONFIG_NSH_CMDOPT_HEXDUMP is not set
+# CONFIG_NSH_DISABLE_DATE is not set
+CONFIG_ARCH_BOARD_SIM=y
+CONFIG_ARCH_BOARD="sim"
+CONFIG_ARCH_SIM=y
+CONFIG_ARCH="sim"
+CONFIG_BINFMT_EXEPATH=y
+CONFIG_BOARD_LOOPSPERMSEC=0
+CONFIG_BOARDCTL_POWEROFF=y
+CONFIG_BOOT_RUNFROMEXTSRAM=y
+CONFIG_BUILTIN=y
+CONFIG_DEBUG_SYMBOLS=y
+CONFIG_DEV_LOOP=y
+CONFIG_DEV_ZERO=y
+CONFIG_DISABLE_POLL=y
+CONFIG_EXAMPLES_NSH=y
+CONFIG_EXAMPLES_USERFS_STACKSIZE=16384
+CONFIG_EXAMPLES_USERFS=y
+CONFIG_FAT_LCNAMES=y
+CONFIG_FAT_LFN=y
+CONFIG_FS_FAT=y
+CONFIG_FS_PROCFS=y
+CONFIG_FS_ROMFS=y
+CONFIG_FS_USERFS=y
+CONFIG_FSUTILS_PASSWD_READONLY=y
+CONFIG_FSUTILS_PASSWD=y
+CONFIG_IDLETHREAD_STACKSIZE=4096
+CONFIG_LIBC_EXECFUNCS=y
+CONFIG_MAX_TASKS=64
+CONFIG_NET_LOCAL=y
+CONFIG_NET=y
+CONFIG_NFILE_DESCRIPTORS=32
+CONFIG_NSH_ARCHINIT=y
+CONFIG_NSH_ARCHROMFS=y
+CONFIG_NSH_BUILTIN_APPS=y
+CONFIG_NSH_FATDEVNO=2
+CONFIG_NSH_FILE_APPS=y
+CONFIG_NSH_READLINE=y
+CONFIG_NSH_ROMFSDEVNO=1
+CONFIG_NSH_ROMFSETC=y
+CONFIG_PATH_INITIAL="/bin"
+CONFIG_POSIX_SPAWN_PROXY_STACKSIZE=2048
+CONFIG_PTHREAD_STACK_DEFAULT=8192
+CONFIG_READLINE_TABCOMPLETION=y
+CONFIG_SCHED_HAVE_PARENT=y
+CONFIG_SCHED_ONEXIT=y
+CONFIG_SCHED_WAITPID=y
+CONFIG_SDCLONE_DISABLE=y
+CONFIG_SIM_WALLTIME=y
+CONFIG_START_MONTH=6
+CONFIG_START_YEAR=2008
+CONFIG_TIME_EXTENDED=y
+CONFIG_USER_ENTRYPOINT="nsh_main"
+CONFIG_USERMAIN_STACKSIZE=4096