diff --git a/bsp/qemu-vexpress-a9/.config b/bsp/qemu-vexpress-a9/.config
index 8a4c1837dcfdfaa93314d6f3d927730be6b2f265..37ff3cbd450cb941d26437cf387049b1db738922 100644
--- a/bsp/qemu-vexpress-a9/.config
+++ b/bsp/qemu-vexpress-a9/.config
@@ -1,9 +1,13 @@
-# Generated by Kconfiglib (https://github.com/ulfalizer/Kconfiglib)
+#
+# Automatically generated file; DO NOT EDIT.
+# RT-Thread Project 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=y
 CONFIG_RT_CPUS_NR=2
@@ -28,8 +32,7 @@ CONFIG_RT_TIMER_THREAD_STACK_SIZE=1024
 #
 # 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
@@ -52,7 +55,6 @@ CONFIG_RT_USING_EVENT=y
 CONFIG_RT_USING_MAILBOX=y
 CONFIG_RT_USING_MESSAGEQUEUE=y
 CONFIG_RT_USING_SIGNALS=y
-# end of Inter-Thread communication
 
 #
 # Memory Management
@@ -66,7 +68,6 @@ CONFIG_RT_USING_SMALL_MEM=y
 # CONFIG_RT_USING_USERHEAP is not set
 CONFIG_RT_USING_MEMTRACE=y
 CONFIG_RT_USING_HEAP=y
-# end of Memory Management
 
 #
 # Kernel Device Object
@@ -78,16 +79,15 @@ CONFIG_RT_USING_CONSOLE=y
 CONFIG_RT_CONSOLEBUF_SIZE=256
 CONFIG_RT_CONSOLE_DEVICE_NAME="uart0"
 # CONFIG_RT_PRINTF_LONGLONG is not set
-# end of Kernel Device Object
-
 CONFIG_RT_VER_NUM=0x40004
-# end of RT-Thread Kernel
-
 CONFIG_ARCH_ARM=y
 CONFIG_RT_USING_CPU_FFS=y
 CONFIG_ARCH_ARM_CORTEX_A=y
+# CONFIG_RT_SMP_AUTO_BOOT is not set
 CONFIG_RT_USING_GIC_V2=y
+# CONFIG_RT_USING_GIC_V3 is not set
 CONFIG_ARCH_ARM_CORTEX_A9=y
+# CONFIG_ARCH_CPU_STACK_GROWS_UPWARD is not set
 
 #
 # RT-Thread Components
@@ -102,7 +102,6 @@ CONFIG_RT_MAIN_THREAD_PRIORITY=10
 #
 CONFIG_RT_USING_CPLUSPLUS=y
 # CONFIG_RT_USING_CPLUSPLUS11 is not set
-# end of C++ features
 
 #
 # Command shell
@@ -122,7 +121,6 @@ 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
@@ -156,13 +154,10 @@ CONFIG_RT_DFS_ELM_MAX_SECTOR_SIZE=4096
 # 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=y
 CONFIG_RT_USING_DFS_RAMFS=y
 # CONFIG_RT_USING_DFS_NFS is not set
-# end of Device virtual file system
 
 #
 # Device Drivers
@@ -226,26 +221,29 @@ CONFIG_RT_USING_WDT=y
 #
 # 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=y
-CONFIG_RT_USING_PTHREADS=y
-CONFIG_PTHREAD_NUM_MAX=8
+CONFIG_RT_LIBC_USING_TIME=y
+# CONFIG_RT_LIBC_USING_FILEIO is not set
+# CONFIG_RT_USING_MODULE is not set
+CONFIG_RT_LIBC_DEFAULT_TIMEZONE=8
 CONFIG_RT_USING_POSIX=y
+# CONFIG_RT_USING_POSIX_STDIO is not set
+CONFIG_RT_USING_POSIX_POLL=y
+CONFIG_RT_USING_POSIX_SELECT=y
+CONFIG_RT_USING_POSIX_DELAY=y
+CONFIG_RT_USING_POSIX_GETLINE=y
 CONFIG_RT_USING_POSIX_MMAP=y
 CONFIG_RT_USING_POSIX_TERMIOS=y
-CONFIG_RT_USING_POSIX_GETLINE=y
 CONFIG_RT_USING_POSIX_AIO=y
-CONFIG_RT_LIBC_USING_TIME=y
-# CONFIG_RT_USING_MODULE is not set
-CONFIG_RT_LIBC_DEFAULT_TIMEZONE=8
-# end of POSIX layer and C standard library
+CONFIG_RT_USING_PTHREADS=y
+CONFIG_PTHREAD_NUM_MAX=8
 
 #
 # Network
@@ -261,10 +259,7 @@ CONFIG_SAL_INTERNET_CHECK=y
 # protocol stack implement
 #
 CONFIG_SAL_USING_LWIP=y
-# end of protocol stack implement
-
 CONFIG_SAL_USING_POSIX=y
-# end of Socket abstraction layer
 
 #
 # Network interface device
@@ -277,7 +272,7 @@ CONFIG_NETDEV_USING_AUTO_DEFAULT=y
 # CONFIG_NETDEV_USING_IPV6 is not set
 CONFIG_NETDEV_IPV4=1
 CONFIG_NETDEV_IPV6=0
-# end of Network interface device
+# CONFIG_NETDEV_IPV6_SCOPES is not set
 
 #
 # light weight TCP/IP stack
@@ -303,8 +298,6 @@ CONFIG_IP_SOF_BROADCAST_RECV=1
 CONFIG_RT_LWIP_IPADDR="192.168.1.30"
 CONFIG_RT_LWIP_GWADDR="192.168.1.1"
 CONFIG_RT_LWIP_MSKADDR="255.255.255.0"
-# end of Static IPv4 Address
-
 CONFIG_RT_LWIP_UDP=y
 CONFIG_RT_LWIP_TCP=y
 CONFIG_RT_LWIP_RAW=y
@@ -339,22 +332,17 @@ CONFIG_LWIP_NETIF_LOOPBACK=0
 # CONFIG_RT_LWIP_USING_HW_CHECKSUM is not set
 CONFIG_RT_LWIP_USING_PING=y
 # CONFIG_RT_LWIP_DEBUG is not set
-# end of light weight TCP/IP stack
 
 #
 # AT commands
 #
 # CONFIG_RT_USING_AT is not set
-# end of AT commands
-
 # CONFIG_LWIP_USING_DHCPD is not set
-# end of Network
 
 #
 # VBUS(Virtual Software BUS)
 #
 # CONFIG_RT_USING_VBUS is not set
-# end of VBUS(Virtual Software BUS)
 
 #
 # Utilities
@@ -364,16 +352,12 @@ CONFIG_RT_LWIP_USING_PING=y
 # 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
-
 CONFIG_RT_USING_LWP=y
-# end of RT-Thread Components
 
 #
 # RT-Thread Utestcases
 #
 # CONFIG_RT_USING_UTESTCASES is not set
-# end of RT-Thread Utestcases
 
 #
 # RT-Thread online packages
@@ -408,17 +392,12 @@ CONFIG_RT_USING_LWP=y
 # 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
@@ -440,8 +419,6 @@ CONFIG_RT_USING_LWP=y
 # 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
@@ -475,7 +452,7 @@ CONFIG_RT_USING_LWP=y
 # 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
+# CONFIG_PKG_USING_SMALL_MODBUS is not set
 
 #
 # security packages
@@ -485,7 +462,6 @@ CONFIG_RT_USING_LWP=y
 # 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
@@ -494,22 +470,19 @@ CONFIG_RT_USING_LWP=y
 # 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
@@ -526,8 +499,6 @@ CONFIG_RT_USING_LWP=y
 #
 # 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
@@ -570,7 +541,6 @@ CONFIG_RT_USING_LWP=y
 # 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
@@ -583,7 +553,13 @@ CONFIG_RT_USING_LWP=y
 # 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
+
+#
+# CMSIS: ARM Cortex-M Microcontroller Software Interface Standard
+#
+# CONFIG_PKG_USING_CMSIS_5 is not set
+# CONFIG_PKG_USING_CMSIS_5_AUX is not set
+# CONFIG_PKG_USING_CMSIS_RTOS2 is not set
 
 #
 # Micrium: Micrium software products porting for RT-Thread
@@ -594,8 +570,6 @@ CONFIG_RT_USING_LWP=y
 # 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_PERSIMMON is not set
 # CONFIG_PKG_USING_CAIRO is not set
@@ -605,7 +579,6 @@ CONFIG_RT_USING_LWP=y
 # CONFIG_PKG_USING_FLASHDB is not set
 # CONFIG_PKG_USING_SQLITE is not set
 # CONFIG_PKG_USING_RTI is not set
-# CONFIG_PKG_USING_CMSIS is not set
 # CONFIG_PKG_USING_DFS_YAFFS is not set
 # CONFIG_PKG_USING_LITTLEFS is not set
 # CONFIG_PKG_USING_DFS_JFFS2 is not set
@@ -630,7 +603,6 @@ CONFIG_RT_USING_LWP=y
 # 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
@@ -706,7 +678,7 @@ CONFIG_RT_USING_LWP=y
 # 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
@@ -720,7 +692,6 @@ CONFIG_RT_USING_LWP=y
 # 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
@@ -733,7 +704,6 @@ CONFIG_RT_USING_LWP=y
 # 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
@@ -747,8 +717,6 @@ CONFIG_RT_USING_LWP=y
 # 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
@@ -778,9 +746,6 @@ CONFIG_RT_USING_LWP=y
 # 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_VEXPRESS_A9=y
 CONFIG_RT_USING_UART0=y
 CONFIG_RT_USING_UART1=y
diff --git a/bsp/qemu-vexpress-a9/rtconfig.h b/bsp/qemu-vexpress-a9/rtconfig.h
index 0bede871b0d72507f5627624f1ca8f1cf76849aa..b0a94bfe080f7dcc7e5b3a9657555a0f4ff3740d 100644
--- a/bsp/qemu-vexpress-a9/rtconfig.h
+++ b/bsp/qemu-vexpress-a9/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 Project Configuration */
 
 /* RT-Thread Kernel */
 
@@ -24,7 +25,6 @@
 
 /* kservice optimization */
 
-/* end of kservice optimization */
 #define RT_DEBUG
 #define RT_DEBUG_COLOR
 
@@ -36,7 +36,6 @@
 #define RT_USING_MAILBOX
 #define RT_USING_MESSAGEQUEUE
 #define RT_USING_SIGNALS
-/* end of Inter-Thread communication */
 
 /* Memory Management */
 
@@ -45,7 +44,6 @@
 #define RT_USING_SMALL_MEM
 #define RT_USING_MEMTRACE
 #define RT_USING_HEAP
-/* end of Memory Management */
 
 /* Kernel Device Object */
 
@@ -55,9 +53,7 @@
 #define RT_USING_CONSOLE
 #define RT_CONSOLEBUF_SIZE 256
 #define RT_CONSOLE_DEVICE_NAME "uart0"
-/* end of Kernel Device Object */
 #define RT_VER_NUM 0x40004
-/* end of RT-Thread Kernel */
 #define ARCH_ARM
 #define RT_USING_CPU_FFS
 #define ARCH_ARM_CORTEX_A
@@ -74,7 +70,6 @@
 /* C++ features */
 
 #define RT_USING_CPLUSPLUS
-/* end of C++ features */
 
 /* Command shell */
 
@@ -91,7 +86,6 @@
 #define MSH_USING_BUILT_IN_COMMANDS
 #define FINSH_USING_DESCRIPTION
 #define FINSH_ARG_MAX 10
-/* end of Command shell */
 
 /* Device virtual file system */
 
@@ -115,11 +109,9 @@
 #define RT_DFS_ELM_MAX_SECTOR_SIZE 4096
 #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
 #define RT_USING_DFS_ROMFS
 #define RT_USING_DFS_RAMFS
-/* end of Device virtual file system */
 
 /* Device Drivers */
 
@@ -156,22 +148,22 @@
 
 /* Using USB */
 
-/* end of Using USB */
-/* end of Device Drivers */
 
 /* POSIX layer and C standard library */
 
 #define RT_USING_LIBC
-#define RT_USING_PTHREADS
-#define PTHREAD_NUM_MAX 8
+#define RT_LIBC_USING_TIME
+#define RT_LIBC_DEFAULT_TIMEZONE 8
 #define RT_USING_POSIX
+#define RT_USING_POSIX_POLL
+#define RT_USING_POSIX_SELECT
+#define RT_USING_POSIX_DELAY
+#define RT_USING_POSIX_GETLINE
 #define RT_USING_POSIX_MMAP
 #define RT_USING_POSIX_TERMIOS
-#define RT_USING_POSIX_GETLINE
 #define RT_USING_POSIX_AIO
-#define RT_LIBC_USING_TIME
-#define RT_LIBC_DEFAULT_TIMEZONE 8
-/* end of POSIX layer and C standard library */
+#define RT_USING_PTHREADS
+#define PTHREAD_NUM_MAX 8
 
 /* Network */
 
@@ -183,9 +175,7 @@
 /* protocol stack implement */
 
 #define SAL_USING_LWIP
-/* end of protocol stack implement */
 #define SAL_USING_POSIX
-/* end of Socket abstraction layer */
 
 /* Network interface device */
 
@@ -196,7 +186,6 @@
 #define NETDEV_USING_AUTO_DEFAULT
 #define NETDEV_IPV4 1
 #define NETDEV_IPV6 0
-/* end of Network interface device */
 
 /* light weight TCP/IP stack */
 
@@ -214,7 +203,6 @@
 #define RT_LWIP_IPADDR "192.168.1.30"
 #define RT_LWIP_GWADDR "192.168.1.1"
 #define RT_LWIP_MSKADDR "255.255.255.0"
-/* end of Static IPv4 Address */
 #define RT_LWIP_UDP
 #define RT_LWIP_TCP
 #define RT_LWIP_RAW
@@ -242,26 +230,19 @@
 #define LWIP_SO_LINGER 0
 #define LWIP_NETIF_LOOPBACK 0
 #define RT_LWIP_USING_PING
-/* 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 */
 #define RT_USING_LWP
-/* end of RT-Thread Components */
 
 /* RT-Thread Utestcases */
 
-/* end of RT-Thread Utestcases */
 
 /* RT-Thread online packages */
 
@@ -272,72 +253,54 @@
 
 /* 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 */
+
+/* CMSIS: ARM Cortex-M Microcontroller Software Interface Standard */
+
 
 /* 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_VEXPRESS_A9
 #define RT_USING_UART0
 #define RT_USING_UART1
diff --git a/components/dfs/Kconfig b/components/dfs/Kconfig
index 7a4fbb655d1f71582537d857be30e852457d1a9a..1ec36784d733d8aeecd75c4a06a2a64e85afff7f 100644
--- a/components/dfs/Kconfig
+++ b/components/dfs/Kconfig
@@ -133,7 +133,7 @@ if RT_USING_DFS
 
     config RT_USING_DFS_DEVFS
         bool "Using devfs for device objects"
-        default y
+        default n
 
     config RT_USING_DFS_ROMFS
         bool "Enable ReadOnly file system on flash"
diff --git a/components/dfs/include/dfs_fs.h b/components/dfs/include/dfs_fs.h
index 3d194515dff8d992d85edcb41d05f47acc9c3384..0a13040c21fe958ddb4d3481658dd528abeb30b9 100644
--- a/components/dfs/include/dfs_fs.h
+++ b/components/dfs/include/dfs_fs.h
@@ -12,10 +12,9 @@
 #define __DFS_FS_H__
 
 #include <dfs.h>
-#ifdef RT_USING_LIBC
 #include <sys/types.h>
-#endif
 #include <sys/errno.h>
+
 #ifdef __cplusplus
 extern "C" {
 #endif
diff --git a/components/dfs/src/dfs.c b/components/dfs/src/dfs.c
index ed8d8094aa2540156c010d7fa9f643044a42ec9f..29b2068a6c43025cfe94e6c4b03f45e68606a898 100644
--- a/components/dfs/src/dfs.c
+++ b/components/dfs/src/dfs.c
@@ -18,9 +18,9 @@
 #include <lwp.h>
 #endif
 
-#ifdef RT_USING_POSIX
+#ifdef RT_USING_POSIX_STDIO
 #include <libc.h>
-#endif /* RT_USING_POSIX */
+#endif /* RT_USING_POSIX_STDIO */
 
 /* Global variables */
 const struct dfs_filesystem_ops *filesystem_operation_table[DFS_FILESYSTEM_TYPES_MAX];
@@ -216,10 +216,10 @@ struct dfs_fd *fd_get(int fd)
     struct dfs_fd *d;
     struct dfs_fdtable *fdt;
 
-#ifdef RT_USING_POSIX
+#ifdef RT_USING_POSIX_STDIO
     if ((0 <= fd) && (fd <= 2))
         fd = libc_stdio_get_console();
-#endif /* RT_USING_POSIX */
+#endif /* RT_USING_POSIX_STDIO */
 
     fdt = dfs_fdtable_get();
     fd = fd - DFS_FD_OFFSET;
diff --git a/components/finsh/shell.c b/components/finsh/shell.c
index 6938ed1f24fa4afe9e63163bf7d970910ffd03df..c2f6e2a55011bccde56fe7dc45c2ab12c6ed38a0 100644
--- a/components/finsh/shell.c
+++ b/components/finsh/shell.c
@@ -146,7 +146,7 @@ int finsh_getchar(void)
 {
 #ifdef RT_USING_DEVICE
     char ch = 0;
-#ifdef RT_USING_POSIX
+#ifdef RT_USING_POSIX_STDIO
     if(read(STDIN_FILENO, &ch, 1) > 0)
     {
         return ch;
@@ -170,14 +170,14 @@ int finsh_getchar(void)
         rt_sem_take(&shell->rx_sem, RT_WAITING_FOREVER);
 
     return ch;
-#endif /* RT_USING_POSIX */
+#endif /* RT_USING_POSIX_STDIO */
 #else
     extern char rt_hw_console_getchar(void);
     return rt_hw_console_getchar();
 #endif /* RT_USING_DEVICE */
 }
 
-#if !defined(RT_USING_POSIX) && defined(RT_USING_DEVICE)
+#if !defined(RT_USING_POSIX_STDIO) && defined(RT_USING_DEVICE)
 static rt_err_t finsh_rx_ind(rt_device_t dev, rt_size_t size)
 {
     RT_ASSERT(shell != RT_NULL);
@@ -241,7 +241,7 @@ const char *finsh_get_device()
     RT_ASSERT(shell != RT_NULL);
     return shell->device->parent.name;
 }
-#endif
+#endif /* !defined(RT_USING_POSIX_STDIO) && defined(RT_USING_DEVICE) */
 
 /**
  * @ingroup finsh
@@ -443,7 +443,7 @@ void finsh_thread_entry(void *parameter)
     shell->echo_mode = 0;
 #endif
 
-#if !defined(RT_USING_POSIX) && defined(RT_USING_DEVICE)
+#if !defined(RT_USING_POSIX_STDIO) && defined(RT_USING_DEVICE)
     /* set console device as shell device */
     if (shell->device == RT_NULL)
     {
@@ -453,7 +453,7 @@ void finsh_thread_entry(void *parameter)
             finsh_set_device(console->parent.name);
         }
     }
-#endif
+#endif /* !defined(RT_USING_POSIX_STDIO) && defined(RT_USING_DEVICE) */
 
 #ifdef FINSH_USING_AUTH
     /* set the default password when the password isn't setting */
diff --git a/components/finsh/shell.h b/components/finsh/shell.h
index 985d3b3fbd4db7cece6f401c098212a5064cf42e..d421f603748d477cfaf94e1580dcb59d8ec2154e 100644
--- a/components/finsh/shell.h
+++ b/components/finsh/shell.h
@@ -78,7 +78,7 @@ struct finsh_shell
     rt_uint16_t line_position;
     rt_uint16_t line_curpos;
 
-#if !defined(RT_USING_POSIX) && defined(RT_USING_DEVICE)
+#if !defined(RT_USING_POSIX_STDIO) && defined(RT_USING_DEVICE)
     rt_device_t device;
 #endif
 
diff --git a/components/libc/Kconfig b/components/libc/Kconfig
index b2af15e8419b10a12032078ce5875a7bfbf19abc..4506001d428ec2c55514f2c96b1cd2b2b9624bcd 100644
--- a/components/libc/Kconfig
+++ b/components/libc/Kconfig
@@ -10,8 +10,8 @@ if RT_USING_LIBC
 
     config RT_LIBC_USING_FILEIO
         bool "Enable libc with file operation, eg.fopen/fwrite/fread/getchar"
-        select RT_USING_DFS
         select RT_USING_POSIX
+        select RT_USING_POSIX_STDIO
         default n
 
     config RT_USING_MODULE
@@ -37,40 +37,59 @@ config RT_LIBC_DEFAULT_TIMEZONE
     range -12 12
     default 8
 
-config RT_USING_PTHREADS
-    bool "Enable pthreads APIs"
+config RT_USING_POSIX
+    bool "Enable basic POSIX layer, open/read/write/close etc"
+    select RT_USING_DFS
     default n
 
-if RT_USING_PTHREADS
-    config PTHREAD_NUM_MAX
-        int "Maximum number of pthreads"
-        default 8
-endif
-
-if RT_USING_DFS
-    config RT_USING_POSIX
-        bool "Enable POSIX layer, open/read/write/select etc"
+if RT_USING_POSIX
+    config RT_USING_POSIX_STDIO
+        bool "Enable standard I/O"
+        select RT_USING_DFS
         select RT_USING_DFS_DEVFS
-        default y
+        default n
 
-    if RT_USING_POSIX
-        config RT_USING_POSIX_MMAP
-            bool "Enable mmap() API"
-            default n
+    config RT_USING_POSIX_POLL
+        bool "Enable poll()"
+        select RT_USING_DFS
+        default n
 
-        config RT_USING_POSIX_TERMIOS
-            bool "Enable termios APIs"
-            default n
+    config RT_USING_POSIX_SELECT
+        bool "Enable select()"
+        select RT_USING_DFS
+        select RT_USING_POSIX_POLL
+        default n
 
-        config RT_USING_POSIX_GETLINE
-            bool "Enable getline()/getdelim() APIs"
-            default n
+    config RT_USING_POSIX_DELAY
+        bool "Enable delay functions"
+        default n
 
-        config RT_USING_POSIX_AIO
-            bool "Enable AIO"
-            default n
-    endif
+    config RT_USING_POSIX_GETLINE
+        bool "Enable getline()/getdelim() APIs"
+        default n
+
+    config RT_USING_POSIX_MMAP
+        bool "Enable mmap() API"
+        select RT_USING_DFS
+        default n
+
+    config RT_USING_POSIX_TERMIOS
+        bool "Enable termios APIs"
+        default n
 
+    config RT_USING_POSIX_AIO
+        bool "Enable AIO"
+        default n
+endif
+
+config RT_USING_PTHREADS
+    bool "Enable pthreads APIs"
+    default n
+
+if RT_USING_PTHREADS
+    config PTHREAD_NUM_MAX
+        int "Maximum number of pthreads"
+        default 8
 endif
 
 endmenu
diff --git a/components/libc/compilers/armlibc/syscalls.c b/components/libc/compilers/armlibc/syscalls.c
index 755ffef1a650711a614f3da4f12a521aba1ea005..62657a4b6491a7df35dfadffb4bde87023d31f5a 100644
--- a/components/libc/compilers/armlibc/syscalls.c
+++ b/components/libc/compilers/armlibc/syscalls.c
@@ -21,7 +21,7 @@
 #include <fcntl.h>
 #include <unistd.h>
 #include <sys/stat.h>
-#ifdef RT_USING_POSIX
+#ifdef RT_USING_POSIX_STDIO
 #include "libc.h"
 #endif
 
@@ -144,7 +144,7 @@ int _sys_close(FILEHANDLE fh)
  */
 int _sys_read(FILEHANDLE fh, unsigned char *buf, unsigned len, int mode)
 {
-#ifdef RT_USING_POSIX
+#ifdef RT_USING_POSIX_STDIO
     int size;
 
     if (fh == STDIN)
@@ -169,7 +169,7 @@ int _sys_read(FILEHANDLE fh, unsigned char *buf, unsigned len, int mode)
         return 0; /* error */
 #else
     return 0; /* error */
-#endif /* RT_USING_POSIX */
+#endif /* RT_USING_POSIX_STDIO */
 }
 
 /*
@@ -185,7 +185,7 @@ int _sys_write(FILEHANDLE fh, const unsigned char *buf, unsigned len, int mode)
 
     if ((fh == STDOUT) || (fh == STDERR))
     {
-#ifdef RT_USING_POSIX
+#ifdef RT_USING_POSIX_STDIO
         if (libc_stdio_get_console() < 0)
         {
             LOG_W("Do not invoke standard input before initializing libc");
@@ -200,7 +200,7 @@ int _sys_write(FILEHANDLE fh, const unsigned char *buf, unsigned len, int mode)
         }
 
         return 0; /* error */
-#endif /* RT_USING_POSIX */
+#endif /* RT_USING_POSIX_STDIO */
     }
     else if (fh == STDIN)
     {
@@ -325,7 +325,7 @@ int fputc(int c, FILE *f)
 
 int fgetc(FILE *f)
 {
-#ifdef RT_USING_POSIX
+#ifdef RT_USING_POSIX_STDIO
     char ch;
 
     if (libc_stdio_get_console() < 0)
@@ -336,7 +336,7 @@ int fgetc(FILE *f)
 
     if(read(STDIN_FILENO, &ch, 1) == 1)
         return ch;
-#endif /* RT_USING_POSIX */
+#endif /* RT_USING_POSIX_STDIO */
     return 0; /* error */
 }
 
diff --git a/components/libc/compilers/dlib/syscall_read.c b/components/libc/compilers/dlib/syscall_read.c
index 74cedb966a73f153b063321c60e0d740a547aaa6..c926c577b5871b24a8e3a95bb984128c293eb1fa 100644
--- a/components/libc/compilers/dlib/syscall_read.c
+++ b/components/libc/compilers/dlib/syscall_read.c
@@ -11,7 +11,7 @@
 #include <rtthread.h>
 #include <yfuns.h>
 #include <unistd.h>
-#ifdef RT_USING_POSIX
+#ifdef RT_USING_POSIX_STDIO
 #include "libc.h"
 #endif
 
@@ -22,7 +22,7 @@
 #pragma module_name = "?__read"
 size_t __read(int handle, unsigned char *buf, size_t len)
 {
-#ifdef RT_USING_POSIX
+#ifdef RT_USING_POSIX_STDIO
     int size;
 
     if (handle == _LLIO_STDIN)
diff --git a/components/libc/compilers/dlib/syscall_write.c b/components/libc/compilers/dlib/syscall_write.c
index ab011c1096fbc0d16652e29d8355391f61f3337c..72bac6ba49a59736ed77944420f327cfb5ae0b37 100644
--- a/components/libc/compilers/dlib/syscall_write.c
+++ b/components/libc/compilers/dlib/syscall_write.c
@@ -11,7 +11,7 @@
 #include <rtthread.h>
 #include <yfuns.h>
 #include <unistd.h>
-#ifdef RT_USING_POSIX
+#ifdef RT_USING_POSIX_STDIO
 #include "libc.h"
 #endif
 
@@ -29,7 +29,7 @@ size_t __write(int handle, const unsigned char *buf, size_t len)
 
     if ((handle == _LLIO_STDOUT) || (handle == _LLIO_STDERR))
     {
-#ifdef RT_USING_POSIX
+#ifdef RT_USING_POSIX_STDIO
         if (libc_stdio_get_console() < 0)
         {
             LOG_W("Do not invoke standard output before initializing libc");
diff --git a/components/libc/compilers/gcc/newlib/syscalls.c b/components/libc/compilers/gcc/newlib/syscalls.c
index f95e695a854db00072490cad67b05c8b1e43c4df..e957aaf003739443a62e6d99ef571003a801d4f9 100644
--- a/components/libc/compilers/gcc/newlib/syscalls.c
+++ b/components/libc/compilers/gcc/newlib/syscalls.c
@@ -20,7 +20,7 @@
 #include <unistd.h>
 #include <sys/errno.h>
 #include <sys/stat.h>
-#ifdef RT_USING_POSIX
+#ifdef RT_USING_POSIX_STDIO
 #include "libc.h"
 #endif
 #ifdef RT_USING_MODULE
@@ -216,7 +216,7 @@ int _open_r(struct _reent *ptr, const char *file, int flags, int mode)
 
 _ssize_t _read_r(struct _reent *ptr, int fd, void *buf, size_t nbytes)
 {
-#ifdef RT_USING_POSIX
+#ifdef RT_USING_POSIX_STDIO
     _ssize_t rc;
     if (libc_stdio_get_console() < 0 && fd == STDIN_FILENO)
     {
@@ -271,11 +271,13 @@ _ssize_t _write_r(struct _reent *ptr, int fd, const void *buf, size_t nbytes)
 {
 #ifdef RT_USING_POSIX
     _ssize_t rc;
+#ifdef RT_USING_POSIX_STDIO
     if (libc_stdio_get_console() < 0 && fd == STDOUT_FILENO)
     {
         LOG_W("Do not invoke standard output before initializing libc");
         return 0;
     }
+#endif /* RT_USING_POSIX_STDIO */
     rc = write(fd, buf, nbytes);
     return rc;
 #elif defined(RT_USING_CONSOLE)
diff --git a/components/libc/compilers/readme.md b/components/libc/compilers/readme.md
new file mode 100644
index 0000000000000000000000000000000000000000..e376cc704fbbf022095bdada67f2b93b1c73eaeb
--- /dev/null
+++ b/components/libc/compilers/readme.md
@@ -0,0 +1 @@
+This folder provides uniformed header files crossing different compiler platforms, and supports basic standard C library functions, such as memory management and time management, etc.
\ No newline at end of file
diff --git a/components/libc/posix/mmap/SConscript b/components/libc/posix/mmap/SConscript
deleted file mode 100644
index fd5b2b953e83d2f2e81909bef3b76fffcf976c79..0000000000000000000000000000000000000000
--- a/components/libc/posix/mmap/SConscript
+++ /dev/null
@@ -1,13 +0,0 @@
-# RT-Thread building script for component
-
-from building import *
-
-cwd = GetCurrentDir()
-src = Glob('*.c') + Glob('*.cpp')
-CPPPATH = [cwd]
-
-group = DefineGroup('POSIX', src,
-    depend = ['RT_USING_DFS', 'RT_USING_POSIX_MMAP'],
-    CPPPATH = CPPPATH)
-
-Return('group')
diff --git a/components/libc/posix/readme.md b/components/libc/posix/readme.md
new file mode 100644
index 0000000000000000000000000000000000000000..787b9ddefa422f988a3e0fd2390fa30de3ea1dd0
--- /dev/null
+++ b/components/libc/posix/readme.md
@@ -0,0 +1 @@
+This folder provides functions that are not part of the standard C library but are part of the POSIX.1 (IEEE Standard 1003.1) standard.
\ No newline at end of file
diff --git a/components/libc/posix/src/SConscript b/components/libc/posix/src/SConscript
index f338b52cec517c00e9bd7ce186c2a6cd43461970..0f5d0e9911da7ca7012c667a052bb0a0d76ad6d7 100644
--- a/components/libc/posix/src/SConscript
+++ b/components/libc/posix/src/SConscript
@@ -1,12 +1,22 @@
+# RT-Thread building script for component
+
 from building import *
-Import('rtconfig')
 
-src     = Glob('*.c')
+src     = ['unistd.c', 'delay.c']
 cwd     = GetCurrentDir()
 CPPPATH = [cwd]
 
-if rtconfig.ARCH == 'sim': # the vs simulator does not support select and poll
-    SrcRemove(src, ['select.c', 'poll.c'])
+if GetDepend('RT_USING_POSIX_STDIO'):
+    src += ['libc.c']
+
+if GetDepend('RT_USING_POSIX_POLL'):
+    src += ['poll.c']
+
+if GetDepend('RT_USING_POSIX_SELECT'):
+    src += ['select.c']
+
+if GetDepend('RT_USING_POSIX_MMAP'):
+    src += ['mmap.c']
 
 group = DefineGroup('POSIX', src, depend = ['RT_USING_POSIX'], CPPPATH = CPPPATH)
 
diff --git a/components/libc/posix/src/delay.c b/components/libc/posix/src/delay.c
index 1638caafbf51c1edbe455b8772378ace1b671be3..c8564dc54e1b08985204b03871d04102d5fa21f2 100644
--- a/components/libc/posix/src/delay.c
+++ b/components/libc/posix/src/delay.c
@@ -7,6 +7,7 @@
  * Date           Author       Notes
  * 2021-05-07     Meco Man     first Version
  */
+#include <sys/types.h>
 #include <rtthread.h>
 #include <rthw.h>
 #define DBG_TAG    "POSIX.delay"
@@ -48,3 +49,38 @@ void ndelay(unsigned long nsecs)
     rt_hw_us_delay(1);
 }
 RTM_EXPORT(ndelay);
+
+unsigned int sleep(unsigned int seconds)
+{
+    if (rt_thread_self() != RT_NULL)
+    {
+        ssleep(seconds);
+    }
+    else /* scheduler has not run yet */
+    {
+        while(seconds > 0)
+        {
+            udelay(1000000u);
+            seconds --;
+        }
+    }
+
+    return 0;
+}
+RTM_EXPORT(sleep);
+
+int usleep(useconds_t usec)
+{
+    if (rt_thread_self() != RT_NULL)
+    {
+        msleep(usec / 1000u);
+    }
+    else  /* scheduler has not run yet */
+    {
+        udelay(usec / 1000u);
+    }
+    udelay(usec % 1000u);
+
+    return 0;
+}
+RTM_EXPORT(usleep);
diff --git a/components/libc/posix/mmap/posix_mmap.c b/components/libc/posix/src/mmap.c
similarity index 100%
rename from components/libc/posix/mmap/posix_mmap.c
rename to components/libc/posix/src/mmap.c
diff --git a/components/libc/posix/src/poll.c b/components/libc/posix/src/poll.c
index 2109fb310bff6d831c4213c8ce724825e7b485a9..0c773b306c6a1a573457a1669cc319556b5f6678 100644
--- a/components/libc/posix/src/poll.c
+++ b/components/libc/posix/src/poll.c
@@ -14,8 +14,6 @@
 #include <dfs_file.h>
 #include <poll.h>
 
-#ifdef RT_USING_POSIX
-
 struct rt_poll_node;
 
 struct rt_poll_table
@@ -226,5 +224,3 @@ int poll(struct pollfd *fds, nfds_t nfds, int timeout)
 
     return num;
 }
-
-#endif
diff --git a/components/libc/posix/src/select.c b/components/libc/posix/src/select.c
index 25cda0f0d138ea466826da1b503c6707d9aac354..55d320e92183e03a6d67e548af50bbde2c4867bb 100644
--- a/components/libc/posix/src/select.c
+++ b/components/libc/posix/src/select.c
@@ -11,8 +11,6 @@
 #include <poll.h>
 #include <sys/select.h>
 
-#ifdef RT_USING_POSIX
-
 static void fdszero(fd_set *set, int nfds)
 {
     fd_mask *m;
@@ -176,5 +174,3 @@ int select(int nfds, fd_set *readfds, fd_set *writefds, fd_set *exceptfds, struc
 
     return ret;
 }
-
-#endif
diff --git a/components/libc/posix/src/unistd.c b/components/libc/posix/src/unistd.c
index ef2df2c2feb0ca97dd4157c1f8ed8047660fd497..85235965ea5cf9360fe384d54eddd9244d7c3ccb 100644
--- a/components/libc/posix/src/unistd.c
+++ b/components/libc/posix/src/unistd.c
@@ -13,7 +13,6 @@
 #include <dfs_private.h>
 #include <sys/errno.h>
 #include <unistd.h>
-#include <delay.h>
 
 /**
  * this function is a POSIX compliant version, which will open a file and
@@ -965,80 +964,3 @@ char *ttyname(int fd)
     return "/dev/tty"; /* TODO: need to add more specific */
 }
 RTM_EXPORT(ttyname);
-
-unsigned int sleep(unsigned int seconds)
-{
-    if (rt_thread_self() != RT_NULL)
-    {
-        ssleep(seconds);
-    }
-    else /* scheduler has not run yet */
-    {
-        while(seconds > 0)
-        {
-            udelay(1000000u);
-            seconds --;
-        }
-    }
-
-    return 0;
-}
-RTM_EXPORT(sleep);
-
-int usleep(useconds_t usec)
-{
-    if (rt_thread_self() != RT_NULL)
-    {
-        msleep(usec / 1000u);
-    }
-    else  /* scheduler has not run yet */
-    {
-        udelay(usec / 1000u);
-    }
-    udelay(usec % 1000u);
-
-    return 0;
-}
-RTM_EXPORT(usleep);
-
-pid_t gettid(void)
-{
-    /*TODO*/
-    return 0;
-}
-
-pid_t getpid(void)
-{
-    return gettid();
-}
-RTM_EXPORT(getpid);
-
-pid_t getppid(void)
-{
-    return 0;
-}
-RTM_EXPORT(getppid);
-
-uid_t getuid(void)
-{
-    return 0; /*ROOT*/
-}
-RTM_EXPORT(getuid);
-
-uid_t geteuid(void)
-{
-    return 0; /*ROOT*/
-}
-RTM_EXPORT(geteuid);
-
-gid_t getgid(void)
-{
-    return 0; /*ROOT*/
-}
-RTM_EXPORT(getgid);
-
-gid_t getegid(void)
-{
-    return 0; /*ROOT*/
-}
-RTM_EXPORT(getegid);
diff --git a/components/lwp/Kconfig b/components/lwp/Kconfig
index 1b37829935e70a2d6e3f9ed2019eccefdf7b4a3f..3e1982001ead4967583865e6321aa74a3463e9a6 100644
--- a/components/lwp/Kconfig
+++ b/components/lwp/Kconfig
@@ -1,6 +1,7 @@
 config RT_USING_LWP
     bool "Using light-weight process"
-    select RT_USING_DFS
+    select RT_USING_POSIX
+    select RT_USING_POSIX_SELECT
     select RT_USING_LIBC
     depends on ARCH_ARM_CORTEX_M || ARCH_ARM_ARM9 || ARCH_ARM_CORTEX_A
     default n
diff --git a/components/lwp/lwp_syscall.c b/components/lwp/lwp_syscall.c
index f9bc84ea97f390d22332177089a088d21e2c90dc..f2aec9303f8ba7f4d05186b22f0f7ab82b4d5a58 100644
--- a/components/lwp/lwp_syscall.c
+++ b/components/lwp/lwp_syscall.c
@@ -18,7 +18,6 @@
 
 #if (defined(RT_USING_SAL) && defined(SAL_USING_POSIX))
 #include <sys/socket.h>
-
 #define SYSCALL_NET(f) ((void*)(f))
 #else
 #define SYSCALL_NET(f) ((void*)sys_notimpl)
diff --git a/components/net/Kconfig b/components/net/Kconfig
index 0fede3eb909bd2b2e86fa5df299f8bc9505cfb61..4d6317bac6b826d3e94b0f922f24e9bfa45186b8 100644
--- a/components/net/Kconfig
+++ b/components/net/Kconfig
@@ -41,9 +41,8 @@ config RT_USING_SAL
         config SAL_USING_POSIX
             bool "Enable BSD socket operated by file system API"
             default n
-            select RT_USING_DFS
-            select RT_USING_LIBC
             select RT_USING_POSIX
+            select RT_USING_POSIX_SELECT
             help
                 Let BSD socket operated by file system API, such as read/write and involveed in select/poll POSIX APIs.
 
diff --git a/include/rtdebug.h b/include/rtdebug.h
index c170d148c10d25e1cdfc712ba08d8cd0f8121178..0858a5bbf10619cea92bb6676fab416a9f85752a 100644
--- a/include/rtdebug.h
+++ b/include/rtdebug.h
@@ -12,13 +12,6 @@
 
 #include <rtconfig.h>
 
-/* settings depend check */
-#ifdef RT_USING_POSIX
-#if !defined(RT_USING_DFS) || !defined(RT_USING_DFS_DEVFS)
-#error "POSIX poll/select, stdin need file system(RT_USING_DFS) and device file system(RT_USING_DFS_DEVFS)"
-#endif
-#endif /* RT_USING_POSIX */
-
 /* Using this macro to control all kernel debug features. */
 #ifdef RT_DEBUG