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@@ -1,3 +1,77 @@
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+# RT-Thread 3.1.0 Change Log
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+
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+## Kernel
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+
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+* The main thread priority can be configured by Kconfig;
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+* Add the checking of kernel object type, which can effectively avoid the problem of continuing to use kernel objects after they are destroyed.
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+* Add the idle hook list to mount multiple idle hook, and can be configured by Kconfig.
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+* Add the device_ops operation set to reduce the footprint of device object.
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+* Remove the special memory operation in application module when using SLAB memory management algorithm.
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+* Move application module from the kernel to `libc/libdl`.
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+* Enhance the debug information output of `rtdbg.h` file.
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+* In Keil/IAR tool chain, the `RT_USED` is used to keep symbols and avoid to add more argument or section in link phrase.
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+
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+## Components
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+
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+* Remove all of external codes, which will be moved to packages in the future.
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+* Add initialization flag for shell, file system, network protocol stack etc to prevent repeated initialization;
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+* Enable the long file name feature of ELM FatFs in default.
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+* Change DFS FD to dynamic allocation mode. The maximum number of allocation is still DFS_FD_MAX.
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+* Add dfs_fdtable_get() function to get different fdtable;
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+* Add more DFS error messages, and provide easy to understand log when abnormal.
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+* Fix the disk format issue of FatFs file system when multiple FatFs file systems are mounted.
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+* Remove the folder enter feature in msh when input a folder name;
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+* Add `int finsh_set_prompt (const char * prompt);` routine for setting a custom prompt for msh;
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+* Add the VBUS configuration in Kconfig.
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+* Move the application module from kernel to `libc/libdl` component;
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+* Rewrite most of the management code for application module: replace the original object container with the object list; split the symbol resolution code into different processor architecture etc.
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+* Update the application module chapter in the programming guide, and change it into dynamic module chapter.
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+* Overwrite the exit() function of newlib to take over the processing of exit for a dlmodule.
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+* Add SAL (Socket Abstraction Layer) component for adapting different protocol stacks and network implementations, and update the relevant sections of the programming guide;
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+* Add AT component, including AT client, AT server and AT Socket function;
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+* Remove the poll/select API of DFS_NET and move them to SAL component.
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+* Remove the strong dependence of lwIP component for DFS_NET and replace it with Kconfig configuration in SAL.
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+* Add the DHCP server function with lwIP raw API;
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+* Fix the wait queue none-initialization issue in socket allocation of lwIP.
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+* When a thread is about to block on a wait queue, fix the wake up issue for `rt_wqueue_wakeup' is executed to wake up that thread;
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+* Add the PWM driver framework;
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+* Fix the sdio_irq_wakeup release issue in the MMC/SD framework.
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+* Fix the problem of DMA handling in the serial driver framework.
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+* Update SFUD to v1.0.6 version;
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+
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+## BSP
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+
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+* Fix the SP issue when hard fault occurs for ARM Cortex-M arch;
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+* Add C-Sky CK802 architecture porting;
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+* Add Realtek amebaz WiFi SOC (rtl8710bn) BSP;
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+* Update imxrt1052-evk firmware SDK to support B model chip.
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+* Fix the copying packets issue in the Godson 1C BSP when sending message.
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+* The Nuvoton m05x/m451 BSP are changed into the main() entry mode, and supports GCC compilation;
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+* Fix the inconsistency issue between touch range and LCD resolution in qemu-vexpress-a9.
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+* Add qemu-vexpress-gemini BSP for dual core A9 (RT-Thread + Linux) arch;
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+* Add the basic porting for Raspberry Pi 2B ;
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+* Add CAN and PWM drivers in stm32f4xx-HAL BSP;
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+* Optimize the GPIO driver in stm32f4xx-HAL BSP;
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+* Add UART3 driver in stm32f4xx-HAL BSP;
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+* Fix the I2C1 driver clock in stm32f10x BSP and WDG control interface.
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+* Add rt_hw_us_delay interface in stm32f10x-HAL BSP;
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+* Optimize the GPIO driver in stm32f10x-HAL BSP;
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+* Add GPIO driver and RTC driver in stm32f107 BSP;
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+
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+## Tool
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+
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+* ENV update to v1.0.0 final version.
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+* ENV added the China mirror for software package, which can speed up the software package download, update etc.
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+* Fix the ENV known bugs and enhance the interaction with users.
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+* Add building script to detect the version of GCC & newlib;
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+* Add building script to detect the version of armcc;
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+* Add `scons --dist` function to make distribution for a BSP.
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+* Add `scons - dist - strip' function to make a minimal files of distribution for a BSP.
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+* Add `ASFLAGS/LOCAL_ASFLAGS' parameters for defined a group and pass them to assembler;
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+* Fix some errors in building script under the Linux environment.
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+* Add the C-Sky CDK IDE project generation.
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+* Add `scons --target=vsc -s` to generate friendly configuration files for VSCode;
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+
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# RT-Thread 3.0.4 Change Log
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## Kernel
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Bernard Xiong