* When formatting the file system, adds FM_SFD option to create a volume in SFD format for FatFs; (HubretXie)
* Add file system handle pointer in `struct dfs_fd' structure;
* Fix stdio fd issue when POSIX api is used; (gbcwbz)
* Fix the `fd_is_open()` issue: when the sub-path is the same in different mounted filesystem.
* Change the critical lock/unlock to dfs_lock/unlock in `getcwd()` function of DFS (the critical lock/unlock is different in SMP environment);
* Fix the `aio_result` issue, which is returned by `aio_read_work` in AIO; (fullhan)
* Fix the mmap issue when the addr parameter is NULL; (fullhan)
* Modify the `_sys_istty` function in armlibc to correctly handle STDIN/STDOUT/STDERR; (gbcwbz)
* Modify the `_write_r` function in newlib to correctly handle stdout.
* Fix the at_socket issue when socket is a null pointer; (thomas onegd)
* Fix the select event issue in `at_recvfrom()` function in at_socket;
* Divide SAL into `sal_socket_ops/sal_proto_ops` and sal_proto_ops is implemented with gethostbyname/getaddrinfo ops etc.
* Add socket TLS layer in SAL, that is, upper application can be supported by encrypted transmission without considering lowlevel TLS at all.
* Fix the length issue of `ulog_strcpy`, which should be not exceed `ULOG_LINE_BUF_SIZE`;
* Add the macro definition of hexadecimal log output to ulog; (HubretXie)
* Add uTest component. The uTest is a unit test framework on RT-Thread, and can also be used for automatic testing on board with external Python scripts.
* Fix some compilation warnings and enumeration mismatches in drivers/audio;
* Fix the `can_rx/can_tx` issue, which is not cleared to NULL when CAN device is closed in drivers/can; (xeonxu)
* Fix drivers/hwtimer, time acquisition issue with counting down mode;
* Add drivers/adc driver framework;
* Fix the tick compensation issue when enable interrupt too early; (geniusgogo)
* Add `RT_SERIAL_USING_DMA` option in drivers/serial;
* Add QSPI support in drivers/spi framework;
* Add QSPI support in SFUD (based on the QSPI peripheral of stm32); SFUD is upgraded to version 1.1.0;
* Optimize SPI take/release function call in spi_msd;
* Fix the `blk_size` issue in `rt_rbb_blk_alloc()`;
* Fix the FS USB issue in `_get_descriptor` function;
* Fix the empty password issue in AP mode of drivers/wlan;
* Fix the return type issue in drivers/wlan;
* Remove the duplicate opening file check when open a file;
# BSP
* Change the name parameter to `cosnt char *` in `rt_hw_interrupt_install` function; (liruncong)
* Fix `$` warning issue in Kconfig files of each BSP;
* Add the LPC54114-lite BSP, including GPIO, I2C, SDCard, SPI, SPI Flash, UART driver;
* Add Nuvoton-M487 BSP, including UART, EMAC driver; (Bluebear 233)
* Fix the CAN driver issue in STM32F4XX-HAL BSP; (xeonxu)
* Fix UART DMA settings issue in STM32F10x/STM32F40x BSP; (zhouchuanfu)
* Fix the HEAP_BEGIN definition issue in STM32H743-Nucleo BSP; (nongxiaoming)
* Fix GPIO configuration issue in stm32f10x-HAL; (Wu Han)
* Change stm32f107 BSP as main function entry; (whj4674672)
* Fix the serial interrupt handling issue in stm32f10x BSP;
* Add PWM, RTC and watchdog drivers to stm32f10x-HAL BSP; (XXXXzzzz000)
* Fix the watchdog driver issue in stm32f4xx-HAL BSP; (XXXXzzzz000)
* Use lwIP version 2.x in stm32f40x/stm32f107 BSP.
* Fix the link issue when enable CmBacktrace package in stm32f4xx-HAL BSP; (xeonxu)
* Support Audio and microphones features in stm32f429-apollo BSP;
* Enable dlmodule support in x86 BSP; (SASANO Takayoshi)
* Addd uTest section in the link script of qemu-vexpress-a9/stm32f429-atk-apollo BSP for automatic testing;
* Change the license to Apache License v2.0 in Godson 1C BSP; (sundm75)
* Add the new BSP framework for STM32 serial chip, such as STM32 G0/F0/L0/F1/F4/F7/H7. In new BSP framework, the SoC drivers is reused. And in same time, lots of STM32 boards are supportted with new BSP framework:
* STM32F091-Nucleo Development Board BSP
* STM32F411-Nucleo Development Board BSP
* STM32L432-Nucleo Development Board BSP; (sun_shine)
* STM32F407-Discovery Development Board BSP
* STM32F446-Nucleo Development Board BSP; (andeyqi)
* STM32F746-Discovery Development Board BSP; (jinsheng)
* STM32F767-Nucleo Development Board BSP; (e31207077)
* STM32G071-Nucleo Development Board BSP;
* ATK STM32F103 NANO Development Board BSP
* ATK STM32F407 Explorer Development Board BSP
* ATK STM32F429 Apollo Development Board BSP
* ATK STM32F767 Apollo Development Board BSP
* ATK STM32L475 Pandora IoT Development Board BSP
* Fire STM32F103 Arbitrary Development Board BSP
* Fire STM32F429 Challenger Development Board BSP
* Fire STM32F767 Challenger Development Board BSP; (Hao Zhu)
* ArmFly STM32F429-v6 Development Board BSP
* STM32F103 iBox development board BSP; (dingo1688)
* Dofly STM32F103 Development Board; (FindYGL)
* STM32F107 uC/Eval Development Board BSP; (whj4674672)
* and more, there are more developers involved for stm32 BSP framework, they are HubretXie, Hao Zhu, e190, etc. to improve the STM32 public driver.
* Add SWM320 BSP of Synwit.cn, including GPIO, HW Timer, I2C, Watchdog, PWM, RTC, SPI, UART, etc.; (provided and maintained by Synwit)
* Add TI TMS320F28379D BSP, the first DSP chip supported on RT-Thread; (xuzhuoyi)
* Fix USB driver issue in X1000; (Zhou YanJie)
# Tool
* Provide more inforamtion when the tool chain does not exist;
* Add a draft Segger Embedded Studio project file generation command. Note that the tool chain in SES is a special version not the newlib.
* Fix the IAR library link command issue when use scons command line under;
* Fix the BSP path issue in scons `str(Dir('#'))`;
* Add `scons --pyconfig-silent` command to add some Kconfig configurations and to generate `.config` and `rtconfig.h` files;
* Update the `scons --dist` command to adapt to the new BSP framework;
* Modify the mkromfs.py script. Fix the corresponding C code generation When the romfs contains empty files or empty folders;
* Fix the issue of version string comparison issue for GNU GCC version in utils.py;
* ENV updated to V1.1.0
* Provide better prompt information to improve user experience;
* Add `system32` path to environment variables to avoid the `cmd` command cannot be found;
* Add `PYTHONHOME` variable to environment variables to avoid PYTHON environment issue;
