sim/login: remove login restrictions to improve the experience for green hands

Most developers start learning Nuttx from sim/nsh, but the login experience is very bad,
they don't know where to get the username and password, this commit will remove the
limitation of sim/nsh login, and add sim/login configuration to ensure the feature of
NSH_CONSOLE_LOGIN is verified.

Signed-off-by: chao an <anchao@lixiang.com>

Documentation/platforms/sim/sim/boards/sim/index.rst

@@ -849,16 +849,7 @@ NOTES:
 
            apps/examples/hello.
 
-  2. This version has password protection enabled.  Here is the login info::
-
-           USERNAME:  admin
-           PASSWORD:  Administrator
-
-     The encrypted password is retained in /etc/passwd.  I am sure that
-     you will find this annoying.  You can disable the password protection
-     by de-selecting CONFIG_NSH_CONSOLE_LOGIN=y.
-
-  3. This configuration has BINFS enabled so that the builtin applications can
+  2. This configuration has BINFS enabled so that the builtin applications can
      be made visible in the file system.  Because of that, the builtin
      applications do not work as other examples.
 
@@ -1807,6 +1798,21 @@ This is a configuration with sim usbhost support.
    Run sim usbhost with root mode, run sim usbdev or plug-in cdcacm usb device.
    Then you can use /dev/ttyACM to transfer data.
 
+login
+-----
+
+This is a configuration with login password protection for nuttx shell.
+
+NOTES:
+
+  This config has password protection enabled.  Here is the login info::
+
+           USERNAME:  admin
+           PASSWORD:  Administrator
+
+  The encrypted password is retained in /etc/passwd.  I am sure that
+  you will find this annoying.  You can disable the password protection
+  by de-selecting CONFIG_NSH_CONSOLE_LOGIN=y.
 
 README.txt
 ==========

boards/sim/sim/sim/configs/login/defconfig

@@ -0,0 +1,67 @@
+#
+# 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_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_DEBUG_SYMBOLS=y
+CONFIG_DEV_GPIO=y
+CONFIG_DEV_LOOP=y
+CONFIG_DEV_ZERO=y
+CONFIG_ETC_FATDEVNO=2
+CONFIG_ETC_ROMFS=y
+CONFIG_ETC_ROMFSDEVNO=1
+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_BINFS=y
+CONFIG_FS_FAT=y
+CONFIG_FS_PROCFS=y
+CONFIG_FS_RAMMAP=y
+CONFIG_FS_ROMFS=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_MAX_EXITFUNS=1
+CONFIG_LIBC_NUMBERED_ARGS=y
+CONFIG_NSH_ARCHINIT=y
+CONFIG_NSH_BUILTIN_APPS=y
+CONFIG_NSH_CONSOLE_LOGIN=y
+CONFIG_NSH_FILE_APPS=y
+CONFIG_NSH_MOTD=y
+CONFIG_NSH_MOTD_STRING="MOTD: username=admin password=Administrator"
+CONFIG_NSH_READLINE=y
+CONFIG_PATH_INITIAL="/bin"
+CONFIG_PSEUDOFS_ATTRIBUTES=y
+CONFIG_PSEUDOFS_SOFTLINKS=y
+CONFIG_READLINE_TABCOMPLETION=y
+CONFIG_SCHED_BACKTRACE=y
+CONFIG_SCHED_HAVE_PARENT=y
+CONFIG_SCHED_WAITPID=y
+CONFIG_SIM_WALLTIME_SIGNAL=y
+CONFIG_START_MONTH=6
+CONFIG_START_YEAR=2008
+CONFIG_SYSTEM_DUMPSTACK=y
+CONFIG_SYSTEM_NSH=y

boards/sim/sim/sim/configs/nsh/defconfig

@@ -27,8 +27,6 @@ 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_BINFS=y
 CONFIG_FS_FAT=y
 CONFIG_FS_PROCFS=y
@@ -48,10 +46,7 @@ CONFIG_LIBC_MAX_EXITFUNS=1
 CONFIG_LIBC_NUMBERED_ARGS=y
 CONFIG_NSH_ARCHINIT=y
 CONFIG_NSH_BUILTIN_APPS=y
-CONFIG_NSH_CONSOLE_LOGIN=y
 CONFIG_NSH_FILE_APPS=y
-CONFIG_NSH_MOTD=y
-CONFIG_NSH_MOTD_STRING="MOTD: username=admin password=Administrator"
 CONFIG_NSH_READLINE=y
 CONFIG_PATH_INITIAL="/bin"
 CONFIG_PSEUDOFS_ATTRIBUTES=y