update change log.

ChangeLog.md

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+# RT-Thread v3.1.4 Change Log
+
+Change log since v3.1.3
+
+## Kernel
+
+* Split the component automatic initialization to component automatic initialization and main funciton;
+* Fix RT_IDLE_HOOK spelling issue;
+* Add thread waiting for message queue when queue is full;
+* Fix the issue of delete mq in `rt_mq_create` in some abnormal case;
+* Remove the C++ keywords in the`rt_console_set_device`function;
+* Remove the `suspend_thread_count` member from memory_pool structure;
+* Fix the issue when block = NULL in rt_mp_free;
+* Fix the issue of critical protection when `rt_thread_delete` change the status of thread;
+
+## Components
+
+* Fix the issue of mPool size in C++ / Queue;
+* Add the error status return in C++ / Thread task join/wait function;
+* Fix compilation warning in DFS/ELM FatFS;
+* Add support for Linux NFS Server in DFS/NFS;
+* Fix mkfs issue in DFS/UFFS;
+* Add ftruncate, flock, getuid, umask APIs;
+* Fix the display issue of fd with offset in list_fd command;
+* Add `dfs_mount_device` API to mount a file system on a device which is already in mount_table;
+* Rename the C++ keywords in DFS/rename function;
+* Connnect dfs/poll, select with RT_USING_POSIX in Kconfig;
+* Optimize the part of the code of finsh to make it more simple;
+* When RT_USING_DEVICE is not used, finsh can use the `rt_hw_console_getchar()` function which is simple to implement and not using the device framework;
+* Increase the line length of the finsh shell to more than 256 characters;
+* utest can support clang compiler and C++ compiler;
+* Fix possible cross-boundary issues in ulog;
+* Fix compilation warning in `ulog/ulog_console_backend_output`;
+* Add support for file sending and receiving feature in YModem;
+* CRC16 can be calculated without the lookup talbe to reduce code size in YModem component;
+* Fix the issue that stack may be wrongly released during pthread/destory;
+* Fix the possible memory leaks issue which caused by pthread_create abnormal case;
+* The timer-related APIs under different compiler of libc are moved to the `libc\compilers\common` folder;
+* Remove redundant definitions in `dlib/sys/unistd.h` (which will cause compilation warnings);
+* Add `sys/errno.h` and`sys/signal.h` header files under dlib;
+* Freemodbus is no longer in the kernel, and split it as a standalone softwre package;
+* AT socket updated to v1.3.0:
+  - Add multi-client and multi-device function support in AT Socket, and improve the dirty data handling when AT device hardware module reboot;
+  - Support netdev network card feature, which can manage and control AT device network connection through the network card interface;
+* Improve AT Server function support in AT components, add AT Server data sending and receiving interfaces `at_server_send ()` and `at_server_recv ()`;
+* Fix the issue of `closesocket()` in SAL component when socket closing failure after `shutdown()`;
+* Improve `sal_bind ()` network card binding related function in SAL component;
+* Add IPV6 related options configuration and function support to SAL and netdev;
+* Improve ping command error handling and log display in the netdev;
+* Add hostname configuration options and functions in lwIP component;
+* Fix the assertion issue of `sys_arch_mbox_fetch()` in lwIP which may occur when a socket is closed;
+* Add network card uninstallation function and support for dhcpd service stop function to the lwip component;
+* Fix lwIP component compilation failure caused by closing FinSH component;
+* Fix the issue that the socket may not be closed during the DHCPD task in the lwIP DHCP server;
+* Add `dhcpd_stop()` interface;
+* Change log in device driver framework:
+  * Refactor audio driver framework;
+  * Fix the issue that the receiving length is 0 in CAN and the issue of returning wrong values;
+  * Add hardware encryption and decryption driver framework;
+  * Fix the flag handling issue of `rt_i2c_master_send/rt_i2c_master_recv`;
+  * Add input capture and pulse encoding driver framework;
+  * Fix the issue that partition lock is deleted when `rt_mmcsd_blk_remove`;
+  * Fix the issue that the enumerated capacity of the large-capacity card in MMC/SD exceeded the data range;
+  * When the SDIO device is initialized, the function's manufacturer and product can also use the information in CIS;
+  * Improve the interrupt mode handling in the sensor framework, and fix the issue that the memory is not released when registering the sensor;
+  * More information are provided in command line of sensor framework;
+  * Add the checking for Rx buffer size in the serial port framework, and provide a notification when RX buffer full;
+  * Remove the old Nor SPI Flash driver in SPI framework, and replace with SFUD component;
+  * Fix some judgements issue in the return value of SFUD;
+  * Fix the definition warning of `SFUD_FLASH_DEVICE_TABLE` in SFUD;
+  * Add support for W25Q64DW devices in SFUD;
+  * Fix FiFo creation failure handling when creating a pipe;
+  * Fix the issue of releasing RBB in advance in `rt_rbb_destroy()` function;
+  * Rename the new keyword using of C++ in `rt_rbb_blk_alloc` function;
+  * Unify the `struct rt_delayed_work` in workqueue to `struct rt_work`;
+  * Add touch driver framework;
+  * Add USB Audio class;
+  * Fix RNDIS plug-in/out issue in USB device stack;
+  * Add the interface callback function in USB device stack;
+  * Improve wlan framework, including command line functions, handling of AP name, password length, support for netdev, better configurability, etc.
+
+## BSP and CPU porting
+
+* Add Clang compiler support in ARM-related CPU porting;
+* Fix SCB_AIRCR definition issue in ARM Cortex-M0;
+* Unify the .data .bss section to 8bytes alignment in GCC tool chain;
+* Rerange NXP i.MXRT BSP and add related BSP documents;
+* Add i.MXRT1052 ATK Commander, Fire Pro BSP and i.MXRT1064 EVK BSP to the new i.MXRT BSP;
+* Fix I2C operation (master_xfer) in LPC54114-lite BSP;
+* Add Audio driver in LPC54114-lite BSP;
+* Refactor qemu-vexpress-a9's Audio driver and fix the issue of OS Tick accuracy;
+* Remove old STM32 BSP: stm32f4xx-HAL, stm32f10x, stm32f10x-HAL, stm32f429-apollo, stm32f429-disco, stm32h743-nucleo;
+* Fix the issue of `rt_hw_sci_init()` for opening the global interrupt in tms320f28379d BSP;
+* Add support of soft I2C and hardware encryption module to WinnerMicro W60x BSP（AES/DES/3DES/RC/SHA1/MD3/CRC);
+* Add oneshot WiFi configuration support in WinnerMicro W60x BSP;
+* Add more STM32 BSP based on new STM32 BSP framework:
+  * stm32f072-st-nucleo
+  * stm32f103-gizwits-gokitv21
+  * stm32f103-yf-ufun
+  * stm32f412-st-nucleo
+  * stm32f427-robomaster-a
+  * stm32f429-st-disco
+  * stm32f769-st-disco
+  * stm32g431-st-nucleo
+  * stm32h743-st-nucleo
+  * stm32h750-armfly-h7-tool
+  * stm32l4r5-st-nucleo
+  * stm32l452-st-nucleo
+* For the new STM32 BSP framework:
+  * Add DMAMUX support to stm32l4+;
+  * Update F7 HAL library SConscript;
+  * Open the SWD port configuration on cubemx in stm32f103-atk-warshipv3 BSP;
+  * Add support for SD card in stm32f427-robomaster-a BSP;
+  * Add USBFS driver to stm32f412-nucleo BSP;
+  * Remove use of device user data on uart driver;
+  * Add QSPI FLASH support in stm32h743-atk-apollo BSP;
+  * Optimized Ethernet driver;
+  * Add hardware encryption and decryption driver;
+  * Add MIPI LCD driver;
+  * Add pulse encoding driver;
+  * Optimize hardware timer driver;
+  * Add support for UART 7/8 in serial driver;
+  * Optimize WDT driver; 
+
+## Tools
+
+* Optimize scons script for eclipse in order to generate eclipse project better;
+* Improve rtconfig.h generator, PATH type configuration can be generated correctly;
+* Fix gcc path detection issue when using the default cross toolchain of the Linux distribution;
+
 # RT-Thread v3.1.3 Change Log
 
 ## Kernel