diff --git a/bsp/simulator/.config b/bsp/simulator/.config
index f47a218d77..3b6f7f3494 100644
--- a/bsp/simulator/.config
+++ b/bsp/simulator/.config
@@ -1,9 +1,13 @@
-# Generated by Kconfiglib (https://github.com/ulfalizer/Kconfiglib)
+#
+# Automatically generated file; DO NOT EDIT.
+# RT-Thread Configuration
+#
 
 #
 # RT-Thread Kernel
 #
 CONFIG_RT_NAME_MAX=8
+# CONFIG_RT_USING_BIG_ENDIAN is not set
 # CONFIG_RT_USING_ARCH_DATA_TYPE is not set
 # CONFIG_RT_USING_SMP is not set
 CONFIG_RT_ALIGN_SIZE=4
@@ -24,8 +28,7 @@ CONFIG_IDLE_THREAD_STACK_SIZE=256
 #
 # CONFIG_RT_KSERVICE_USING_STDLIB is not set
 # CONFIG_RT_KSERVICE_USING_TINY_SIZE is not set
-# end of kservice optimization
-
+# CONFIG_RT_USING_ASM_MEMCPY is not set
 CONFIG_RT_DEBUG=y
 CONFIG_RT_DEBUG_COLOR=y
 # CONFIG_RT_DEBUG_INIT_CONFIG is not set
@@ -48,7 +51,6 @@ CONFIG_RT_USING_EVENT=y
 CONFIG_RT_USING_MAILBOX=y
 CONFIG_RT_USING_MESSAGEQUEUE=y
 # CONFIG_RT_USING_SIGNALS is not set
-# end of Inter-Thread communication
 
 #
 # Memory Management
@@ -61,7 +63,6 @@ CONFIG_RT_USING_SMALL_MEM=y
 # CONFIG_RT_USING_USERHEAP is not set
 # CONFIG_RT_USING_MEMTRACE is not set
 CONFIG_RT_USING_HEAP=y
-# end of Memory Management
 
 #
 # Kernel Device Object
@@ -73,10 +74,9 @@ CONFIG_RT_USING_CONSOLE=y
 CONFIG_RT_CONSOLEBUF_SIZE=128
 CONFIG_RT_CONSOLE_DEVICE_NAME="console"
 # CONFIG_RT_PRINTF_LONGLONG is not set
-# end of Kernel Device Object
-
 CONFIG_RT_VER_NUM=0x40004
-# end of RT-Thread Kernel
+# CONFIG_RT_USING_CPU_FFS is not set
+# CONFIG_ARCH_CPU_STACK_GROWS_UPWARD is not set
 
 #
 # RT-Thread Components
@@ -90,7 +90,6 @@ CONFIG_RT_MAIN_THREAD_PRIORITY=10
 # C++ features
 #
 # CONFIG_RT_USING_CPLUSPLUS is not set
-# end of C++ features
 
 #
 # Command shell
@@ -110,7 +109,6 @@ CONFIG_FINSH_USING_DESCRIPTION=y
 # CONFIG_FINSH_ECHO_DISABLE_DEFAULT is not set
 # CONFIG_FINSH_USING_AUTH is not set
 CONFIG_FINSH_ARG_MAX=10
-# end of Command shell
 
 #
 # Device virtual file system
@@ -144,12 +142,9 @@ CONFIG_RT_DFS_ELM_MAX_SECTOR_SIZE=512
 # CONFIG_RT_DFS_ELM_USE_ERASE is not set
 CONFIG_RT_DFS_ELM_REENTRANT=y
 CONFIG_RT_DFS_ELM_MUTEX_TIMEOUT=3000
-# end of elm-chan's FatFs, Generic FAT Filesystem Module
-
 CONFIG_RT_USING_DFS_DEVFS=y
 # CONFIG_RT_USING_DFS_ROMFS is not set
 # CONFIG_RT_USING_DFS_RAMFS is not set
-# end of Device virtual file system
 
 #
 # Device Drivers
@@ -189,19 +184,22 @@ CONFIG_RT_SERIAL_RB_BUFSZ=64
 #
 # Using USB
 #
+# CONFIG_RT_USING_USB is not set
 # CONFIG_RT_USING_USB_HOST is not set
 # CONFIG_RT_USING_USB_DEVICE is not set
-# end of Using USB
-# end of Device Drivers
 
 #
 # POSIX layer and C standard library
 #
 # CONFIG_RT_USING_LIBC is not set
-# CONFIG_RT_USING_PTHREADS is not set
 CONFIG_RT_LIBC_USING_TIME=y
 CONFIG_RT_LIBC_DEFAULT_TIMEZONE=8
-# end of POSIX layer and C standard library
+# CONFIG_RT_USING_PTHREADS is not set
+CONFIG_RT_USING_POSIX=y
+# CONFIG_RT_USING_POSIX_MMAP is not set
+# CONFIG_RT_USING_POSIX_TERMIOS is not set
+# CONFIG_RT_USING_POSIX_GETLINE is not set
+# CONFIG_RT_USING_POSIX_AIO is not set
 
 #
 # Network
@@ -211,32 +209,26 @@ CONFIG_RT_LIBC_DEFAULT_TIMEZONE=8
 # Socket abstraction layer
 #
 # CONFIG_RT_USING_SAL is not set
-# end of Socket abstraction layer
 
 #
 # Network interface device
 #
 # CONFIG_RT_USING_NETDEV is not set
-# end of Network interface device
 
 #
 # light weight TCP/IP stack
 #
 # CONFIG_RT_USING_LWIP is not set
-# end of light weight TCP/IP stack
 
 #
 # AT commands
 #
 # CONFIG_RT_USING_AT is not set
-# end of AT commands
-# end of Network
 
 #
 # VBUS(Virtual Software BUS)
 #
 # CONFIG_RT_USING_VBUS is not set
-# end of VBUS(Virtual Software BUS)
 
 #
 # Utilities
@@ -246,14 +238,11 @@ CONFIG_RT_LIBC_DEFAULT_TIMEZONE=8
 # CONFIG_RT_USING_UTEST is not set
 # CONFIG_RT_USING_VAR_EXPORT is not set
 # CONFIG_RT_USING_RT_LINK is not set
-# end of Utilities
-# end of RT-Thread Components
 
 #
 # RT-Thread Utestcases
 #
 # CONFIG_RT_USING_UTESTCASES is not set
-# end of RT-Thread Utestcases
 
 #
 # RT-Thread online packages
@@ -288,17 +277,12 @@ CONFIG_RT_LIBC_DEFAULT_TIMEZONE=8
 # Marvell WiFi
 #
 # CONFIG_PKG_USING_WLANMARVELL is not set
-# end of Marvell WiFi
 
 #
 # Wiced WiFi
 #
 # CONFIG_PKG_USING_WLAN_WICED is not set
-# end of Wiced WiFi
-
 # CONFIG_PKG_USING_RW007 is not set
-# end of Wi-Fi
-
 # CONFIG_PKG_USING_COAP is not set
 # CONFIG_PKG_USING_NOPOLL is not set
 # CONFIG_PKG_USING_NETUTILS is not set
@@ -320,8 +304,6 @@ CONFIG_RT_LIBC_DEFAULT_TIMEZONE=8
 # CONFIG_PKG_USING_JIOT-C-SDK is not set
 # CONFIG_PKG_USING_UCLOUD_IOT_SDK is not set
 # CONFIG_PKG_USING_JOYLINK is not set
-# end of IoT Cloud
-
 # CONFIG_PKG_USING_NIMBLE is not set
 # CONFIG_PKG_USING_OTA_DOWNLOADER is not set
 # CONFIG_PKG_USING_IPMSG is not set
@@ -355,7 +337,6 @@ CONFIG_RT_LIBC_DEFAULT_TIMEZONE=8
 # CONFIG_PKG_USING_LORA_GW_DRIVER_LIB is not set
 # CONFIG_PKG_USING_LORA_PKT_SNIFFER is not set
 # CONFIG_PKG_USING_HM is not set
-# end of IoT - internet of things
 
 #
 # security packages
@@ -365,7 +346,6 @@ CONFIG_RT_LIBC_DEFAULT_TIMEZONE=8
 # CONFIG_PKG_USING_TINYCRYPT is not set
 # CONFIG_PKG_USING_TFM is not set
 # CONFIG_PKG_USING_YD_CRYPTO is not set
-# end of security packages
 
 #
 # language packages
@@ -374,22 +354,19 @@ CONFIG_RT_LIBC_DEFAULT_TIMEZONE=8
 # CONFIG_PKG_USING_JERRYSCRIPT is not set
 # CONFIG_PKG_USING_MICROPYTHON is not set
 # CONFIG_PKG_USING_PIKASCRIPT is not set
-# end of language packages
 
 #
 # multimedia packages
 #
-# CONFIG_PKG_USING_OPENMV is not set
-# CONFIG_PKG_USING_MUPDF is not set
-# CONFIG_PKG_USING_STEMWIN is not set
 
 #
-# lvgl: powerful and easy-to-use embedded GUI library
+# LVGL: powerful and easy-to-use embedded GUI library
 #
 # CONFIG_PKG_USING_LITTLEVGL2RTT is not set
 # CONFIG_PKG_USING_LVGL is not set
-# end of lvgl: powerful and easy-to-use embedded GUI library
-
+# CONFIG_PKG_USING_OPENMV is not set
+# CONFIG_PKG_USING_MUPDF is not set
+# CONFIG_PKG_USING_STEMWIN is not set
 # CONFIG_PKG_USING_WAVPLAYER is not set
 # CONFIG_PKG_USING_TJPGD is not set
 # CONFIG_PKG_USING_PDFGEN is not set
@@ -406,8 +383,6 @@ CONFIG_RT_LIBC_DEFAULT_TIMEZONE=8
 #
 # CONFIG_PKG_USING_U8G2_OFFICIAL is not set
 # CONFIG_PKG_USING_U8G2 is not set
-# end of u8g2: a monochrome graphic library
-# end of multimedia packages
 
 #
 # tools packages
@@ -450,7 +425,6 @@ CONFIG_RT_LIBC_DEFAULT_TIMEZONE=8
 # CONFIG_PKG_USING_MEM_SANDBOX is not set
 # CONFIG_PKG_USING_SOLAR_TERMS is not set
 # CONFIG_PKG_USING_GAN_ZHI is not set
-# end of tools packages
 
 #
 # system packages
@@ -463,7 +437,6 @@ CONFIG_RT_LIBC_DEFAULT_TIMEZONE=8
 # CONFIG_PKG_USING_QFPLIB_M0_FULL is not set
 # CONFIG_PKG_USING_QFPLIB_M0_TINY is not set
 # CONFIG_PKG_USING_QFPLIB_M3 is not set
-# end of acceleration: Assembly language or algorithmic acceleration packages
 
 #
 # Micrium: Micrium software products porting for RT-Thread
@@ -474,8 +447,6 @@ CONFIG_RT_LIBC_DEFAULT_TIMEZONE=8
 # CONFIG_PKG_USING_UC_CLK is not set
 # CONFIG_PKG_USING_UC_COMMON is not set
 # CONFIG_PKG_USING_UC_MODBUS is not set
-# end of Micrium: Micrium software products porting for RT-Thread
-
 # CONFIG_PKG_USING_GUIENGINE is not set
 # CONFIG_PKG_USING_CAIRO is not set
 # CONFIG_PKG_USING_PIXMAN is not set
@@ -509,7 +480,6 @@ CONFIG_RT_LIBC_DEFAULT_TIMEZONE=8
 # CONFIG_PKG_USING_WCWIDTH is not set
 # CONFIG_PKG_USING_MCUBOOT is not set
 # CONFIG_PKG_USING_TINYUSB is not set
-# end of system packages
 
 #
 # peripheral libraries and drivers
@@ -585,7 +555,7 @@ CONFIG_RT_LIBC_DEFAULT_TIMEZONE=8
 # CONFIG_PKG_USING_MISAKA_RGB_BLING is not set
 # CONFIG_PKG_USING_BL_MCU_SDK is not set
 # CONFIG_PKG_USING_SOFT_SERIAL is not set
-# end of peripheral libraries and drivers
+# CONFIG_PKG_USING_MB85RS16 is not set
 
 #
 # AI packages
@@ -599,7 +569,6 @@ CONFIG_RT_LIBC_DEFAULT_TIMEZONE=8
 # CONFIG_PKG_USING_ULAPACK is not set
 # CONFIG_PKG_USING_QUEST is not set
 # CONFIG_PKG_USING_NAXOS is not set
-# end of AI packages
 
 #
 # miscellaneous packages
@@ -612,7 +581,6 @@ CONFIG_RT_LIBC_DEFAULT_TIMEZONE=8
 # CONFIG_PKG_USING_FILESYSTEM_SAMPLES is not set
 # CONFIG_PKG_USING_NETWORK_SAMPLES is not set
 # CONFIG_PKG_USING_PERIPHERAL_SAMPLES is not set
-# end of samples: kernel and components samples
 
 #
 # entertainment: terminal games and other interesting software packages
@@ -626,8 +594,6 @@ CONFIG_RT_LIBC_DEFAULT_TIMEZONE=8
 # CONFIG_PKG_USING_SNAKE is not set
 # CONFIG_PKG_USING_TETRIS is not set
 # CONFIG_PKG_USING_DONUT is not set
-# end of entertainment: terminal games and other interesting software packages
-
 # CONFIG_PKG_USING_LIBCSV is not set
 # CONFIG_PKG_USING_OPTPARSE is not set
 # CONFIG_PKG_USING_FASTLZ is not set
@@ -657,8 +623,5 @@ CONFIG_RT_LIBC_DEFAULT_TIMEZONE=8
 # CONFIG_PKG_USING_MCURSES is not set
 # CONFIG_PKG_USING_COWSAY is not set
 # CONFIG_PKG_USING_TERMBOX is not set
-# end of miscellaneous packages
-# end of RT-Thread online packages
-
 CONFIG_SOC_SIMULATOR=y
 CONFIG_RT_USING_DFS_WINSHAREDIR=y
diff --git a/bsp/simulator/applications/platform.c b/bsp/simulator/applications/platform.c
index 815c189e40..2594772eb2 100644
--- a/bsp/simulator/applications/platform.c
+++ b/bsp/simulator/applications/platform.c
@@ -11,10 +11,6 @@
 
 #include <shell.h>
 
-#ifdef RT_USING_POSIX
-#error "simulator does not support RT_USING_POSIX"
-#endif
-
 #ifdef RT_USING_LIBC
 #error "simulator does not support RT_USING_LIBC"
 #endif
diff --git a/bsp/simulator/drivers/board.c b/bsp/simulator/drivers/board.c
index 0516af6f79..39c48aa41b 100755
--- a/bsp/simulator/drivers/board.c
+++ b/bsp/simulator/drivers/board.c
@@ -111,9 +111,4 @@ int rt_hw_board_init(void)
     return 0;
 }
 
-void rt_hw_us_delay(rt_uint32_t usec)
-{
-
-}
-
 /*@}*/
diff --git a/bsp/simulator/rtconfig.h b/bsp/simulator/rtconfig.h
index ad7634d729..abbb3008e7 100755
--- a/bsp/simulator/rtconfig.h
+++ b/bsp/simulator/rtconfig.h
@@ -1,7 +1,8 @@
 #ifndef RT_CONFIG_H__
 #define RT_CONFIG_H__
 
-/* Generated by Kconfiglib (https://github.com/ulfalizer/Kconfiglib) */
+/* Automatically generated file; DO NOT EDIT. */
+/* RT-Thread Configuration */
 
 /* RT-Thread Kernel */
 
@@ -18,7 +19,6 @@
 
 /* kservice optimization */
 
-/* end of kservice optimization */
 #define RT_DEBUG
 #define RT_DEBUG_COLOR
 
@@ -29,14 +29,12 @@
 #define RT_USING_EVENT
 #define RT_USING_MAILBOX
 #define RT_USING_MESSAGEQUEUE
-/* end of Inter-Thread communication */
 
 /* Memory Management */
 
 #define RT_USING_MEMPOOL
 #define RT_USING_SMALL_MEM
 #define RT_USING_HEAP
-/* end of Memory Management */
 
 /* Kernel Device Object */
 
@@ -44,9 +42,7 @@
 #define RT_USING_CONSOLE
 #define RT_CONSOLEBUF_SIZE 128
 #define RT_CONSOLE_DEVICE_NAME "console"
-/* end of Kernel Device Object */
 #define RT_VER_NUM 0x40004
-/* end of RT-Thread Kernel */
 
 /* RT-Thread Components */
 
@@ -57,7 +53,6 @@
 
 /* C++ features */
 
-/* end of C++ features */
 
 /* Command shell */
 
@@ -74,7 +69,6 @@
 #define MSH_USING_BUILT_IN_COMMANDS
 #define FINSH_USING_DESCRIPTION
 #define FINSH_ARG_MAX 10
-/* end of Command shell */
 
 /* Device virtual file system */
 
@@ -98,9 +92,7 @@
 #define RT_DFS_ELM_MAX_SECTOR_SIZE 512
 #define RT_DFS_ELM_REENTRANT
 #define RT_DFS_ELM_MUTEX_TIMEOUT 3000
-/* end of elm-chan's FatFs, Generic FAT Filesystem Module */
 #define RT_USING_DFS_DEVFS
-/* end of Device virtual file system */
 
 /* Device Drivers */
 
@@ -113,46 +105,35 @@
 
 /* Using USB */
 
-/* end of Using USB */
-/* end of Device Drivers */
 
 /* POSIX layer and C standard library */
 
 #define RT_LIBC_USING_TIME
 #define RT_LIBC_DEFAULT_TIMEZONE 8
-/* end of POSIX layer and C standard library */
+#define RT_USING_POSIX
 
 /* Network */
 
 /* Socket abstraction layer */
 
-/* end of Socket abstraction layer */
 
 /* Network interface device */
 
-/* end of Network interface device */
 
 /* light weight TCP/IP stack */
 
-/* end of light weight TCP/IP stack */
 
 /* AT commands */
 
-/* end of AT commands */
-/* end of Network */
 
 /* VBUS(Virtual Software BUS) */
 
-/* end of VBUS(Virtual Software BUS) */
 
 /* Utilities */
 
-/* end of Utilities */
-/* end of RT-Thread Components */
 
 /* RT-Thread Utestcases */
 
-/* end of RT-Thread Utestcases */
 
 /* RT-Thread online packages */
 
@@ -163,72 +144,51 @@
 
 /* Marvell WiFi */
 
-/* end of Marvell WiFi */
 
 /* Wiced WiFi */
 
-/* end of Wiced WiFi */
-/* end of Wi-Fi */
 
 /* IoT Cloud */
 
-/* end of IoT Cloud */
-/* end of IoT - internet of things */
 
 /* security packages */
 
-/* end of security packages */
 
 /* language packages */
 
-/* end of language packages */
 
 /* multimedia packages */
 
+/* LVGL: powerful and easy-to-use embedded GUI library */
 
-/* lvgl: powerful and easy-to-use embedded GUI library */
-
-/* end of lvgl: powerful and easy-to-use embedded GUI library */
 
 /* u8g2: a monochrome graphic library */
 
-/* end of u8g2: a monochrome graphic library */
-/* end of multimedia packages */
 
 /* tools packages */
 
-/* end of tools packages */
 
 /* system packages */
 
 /* acceleration: Assembly language or algorithmic acceleration packages */
 
-/* end of acceleration: Assembly language or algorithmic acceleration packages */
 
 /* Micrium: Micrium software products porting for RT-Thread */
 
-/* end of Micrium: Micrium software products porting for RT-Thread */
-/* end of system packages */
 
 /* peripheral libraries and drivers */
 
-/* end of peripheral libraries and drivers */
 
 /* AI packages */
 
-/* end of AI packages */
 
 /* miscellaneous packages */
 
 /* samples: kernel and components samples */
 
-/* end of samples: kernel and components samples */
 
 /* entertainment: terminal games and other interesting software packages */
 
-/* end of entertainment: terminal games and other interesting software packages */
-/* end of miscellaneous packages */
-/* end of RT-Thread online packages */
 #define SOC_SIMULATOR
 #define RT_USING_DFS_WINSHAREDIR
 #include "rtconfig_project.h"
diff --git a/bsp/simulator/rtconfig.py b/bsp/simulator/rtconfig.py
index d08447939d..2b18c2140a 100755
--- a/bsp/simulator/rtconfig.py
+++ b/bsp/simulator/rtconfig.py
@@ -42,7 +42,7 @@ elif  CROSS_TOOL == 'msvc':
         print('Successfully installed VC %s, path:%s' % (vc_version, EXEC_PATH))
 
 else:
-    print("bad CROSS TOOL!")
+    print("Simulator does not support this CROSS TOOL!")
     exit(1)
 
 if os.getenv('RTT_EXEC_PATH'):
diff --git a/components/libc/compilers/common/SConscript b/components/libc/compilers/common/SConscript
index bd66b70c7e..504bf84e56 100644
--- a/components/libc/compilers/common/SConscript
+++ b/components/libc/compilers/common/SConscript
@@ -1,5 +1,4 @@
 from building import *
-
 Import('rtconfig')
 
 src   = []
diff --git a/components/libc/posix/src/SConscript b/components/libc/posix/src/SConscript
index 8712d671c0..f338b52cec 100644
--- a/components/libc/posix/src/SConscript
+++ b/components/libc/posix/src/SConscript
@@ -1,11 +1,13 @@
-# RT-Thread building script for component
-
 from building import *
+Import('rtconfig')
 
 src     = Glob('*.c')
 cwd     = GetCurrentDir()
 CPPPATH = [cwd]
 
+if rtconfig.ARCH == 'sim': # the vs simulator does not support select and poll
+    SrcRemove(src, ['select.c', 'poll.c'])
+
 group = DefineGroup('POSIX', src, depend = ['RT_USING_POSIX'], CPPPATH = CPPPATH)
 
 Return('group')
diff --git a/components/libc/posix/src/libc.c b/components/libc/posix/src/libc.c
index 84c5a601bc..068719d5d6 100644
--- a/components/libc/posix/src/libc.c
+++ b/components/libc/posix/src/libc.c
@@ -144,5 +144,5 @@ int libc_stdio_set_console(const char* device_name, int mode)
 int libc_stdio_get_console(void) {
     return std_fd;
 }
-#endif /* defined(RT_USING_LIBC) && (defined(__GNUC__) && !defined(__ARMCC_VERSION)) */
+#endif /* defined(RT_USING_LIBC) && defined(RT_USING_NEWLIB) */
 #endif /* RT_USING_POSIX */