diff --git a/boards/sim/sim/sim/configs/posix_test/defconfig b/boards/sim/sim/sim/configs/posix_test/defconfig
new file mode 100644
index 00000000000..509eb1f9ef7
--- /dev/null
+++ b/boards/sim/sim/sim/configs/posix_test/defconfig
@@ -0,0 +1,98 @@
+#
+# This file is autogenerated: PLEASE DO NOT EDIT IT.
+#
+# You can use "make menuconfig" to make any modifications to the installed .config file.
+# You can then do "make savedefconfig" to generate a new defconfig file that includes your
+# modifications.
+#
+# CONFIG_NSH_CMDOPT_HEXDUMP is not set
+CONFIG_ALLOW_MIT_COMPONENTS=y
+CONFIG_ALLSYMS=y
+CONFIG_ARCH="sim"
+CONFIG_ARCH_BOARD="sim"
+CONFIG_ARCH_BOARD_SIM=y
+CONFIG_ARCH_CHIP="sim"
+CONFIG_ARCH_SIM=y
+CONFIG_BOARDCTL_APP_SYMTAB=y
+CONFIG_BOARDCTL_POWEROFF=y
+CONFIG_BOARD_LOOPSPERMSEC=0
+CONFIG_BOOT_RUNFROMEXTSRAM=y
+CONFIG_BUILTIN=y
+CONFIG_CANCELLATION_POINTS=y
+CONFIG_DEBUG_ASSERTIONS=y
+CONFIG_DEBUG_FEATURES=y
+CONFIG_DEBUG_SYMBOLS=y
+CONFIG_DEV_GPIO=y
+CONFIG_DEV_LOOP=y
+CONFIG_DEV_ZERO=y
+CONFIG_EXAMPLES_GPIO=y
+CONFIG_EXAMPLES_HELLO=y
+CONFIG_FAT_LCNAMES=y
+CONFIG_FAT_LFN=y
+CONFIG_FSUTILS_PASSWD=y
+CONFIG_FSUTILS_PASSWD_READONLY=y
+CONFIG_FS_AIO=y
+CONFIG_FS_BINFS=y
+CONFIG_FS_FAT=y
+CONFIG_FS_HOSTFS=y
+CONFIG_FS_NAMED_SEMAPHORES=y
+CONFIG_FS_PROCFS=y
+CONFIG_FS_RAMMAP=y
+CONFIG_FS_ROMFS=y
+CONFIG_FS_SHMFS=y
+CONFIG_FS_TMPFS=y
+CONFIG_GPIO_LOWER_HALF=y
+CONFIG_IDLETHREAD_STACKSIZE=4096
+CONFIG_INIT_ENTRYPOINT="nsh_main"
+CONFIG_IOEXPANDER=y
+CONFIG_IOEXPANDER_DUMMY=y
+CONFIG_LIBC_ENVPATH=y
+CONFIG_LIBC_EXECFUNCS=y
+CONFIG_LIBC_LOCALE=y
+CONFIG_LIBC_LOCALE_CATALOG=y
+CONFIG_LIBC_LOCALE_GETTEXT=y
+CONFIG_LIBC_LOCALTIME=y
+CONFIG_LIBC_MAX_EXITFUNS=32
+CONFIG_LIBC_NUMBERED_ARGS=y
+CONFIG_LIBC_PASSWD_FILE=y
+CONFIG_MQ_MAXMSGSIZE=64
+CONFIG_NDEBUG=y
+CONFIG_NSH_ARCHINIT=y
+CONFIG_NSH_ARCHROMFS=y
+CONFIG_NSH_BUILTIN_APPS=y
+CONFIG_NSH_FATDEVNO=2
+CONFIG_NSH_FILE_APPS=y
+CONFIG_NSH_MOTD=y
+CONFIG_NSH_MOTD_STRING="MOTD: username=admin password=Administrator"
+CONFIG_NSH_READLINE=y
+CONFIG_NSH_ROMFSDEVNO=1
+CONFIG_NSH_ROMFSETC=y
+CONFIG_PATH_INITIAL="/bin"
+CONFIG_PIPES=y
+CONFIG_PSEUDOFS_ATTRIBUTES=y
+CONFIG_PSEUDOFS_SOFTLINKS=y
+CONFIG_PTHREAD_CLEANUP_STACKSIZE=4
+CONFIG_PTHREAD_MUTEX_TYPES=y
+CONFIG_PTHREAD_SPINLOCKS=y
+CONFIG_READLINE_TABCOMPLETION=y
+CONFIG_RR_INTERVAL=200
+CONFIG_SCHED_BACKTRACE=y
+CONFIG_SCHED_CHILD_STATUS=y
+CONFIG_SCHED_CRITMONITOR=y
+CONFIG_SCHED_HAVE_PARENT=y
+CONFIG_SCHED_LPNTHREADS=1
+CONFIG_SCHED_LPWORK=y
+CONFIG_SCHED_SPORADIC=y
+CONFIG_SCHED_USER_IDENTITY=y
+CONFIG_SCHED_WAITPID=y
+CONFIG_SIG_DEFAULT=y
+CONFIG_SIG_EVTHREAD=y
+CONFIG_SIM_HOSTFS=y
+CONFIG_SIM_WALLTIME_SIGNAL=y
+CONFIG_SPINLOCK=y
+CONFIG_START_MONTH=6
+CONFIG_START_YEAR=2008
+CONFIG_SYSTEM_DUMPSTACK=y
+CONFIG_SYSTEM_NSH=y
+CONFIG_TESTING_LTP=y
+CONFIG_TLS_NELEM=16