v3.0.4

Kernel

Change the location of hook invoking in rt_event_send, which can better reflect the event value to the system view.
Fix the rt_realloc() issue in memheap;
Fix the vstart_addr issue in the dynamic library.
Ensure that signal is more standardized and remove si_errno members from siginfo_t;
Add rt_thread_mdelay() API for millisecond delay in thread.

Components

Fix the DFS mkfs issue of FatFs (which is a merge issue introduced in RT-Thread V3.0 upgrade).
Fix dfs_net poll issue, if there is already received data, the upper layer can not wake up and deal with data.
Fix the socket issue in dfs_net if lwip_socket failed(Bluebear233);
If the dfs_net/socket feature is used within lwIP 1.x version, a compiler error will be returned.
Fix the DFS df() information issue;
Fix the audio device write issue while the interrupt is not properly recovered.
Fix the one-shot timeout issue in the hardware timer driver framework.
In ENC28J60 driver, the "link change interrupt" is enable in initialization.
Fix the data issue in put data into ringbuffer.
Add UDP information display in netstat command;
Fix the USB HS issue when sending 1 bytes of data will cause two times of transmission.
Change the registration mechanism of USB Class Driver and Class Driver can be registered in package.
Add USB Device driver framework for HS USB.
Enhance the compatibility of time() function for different compilers;
Add more configuration items for DHCPD in menuconfig.

BSP

Temporarily remove the Andes AE210P transplant because of the mistakenly use SVC for context switching.
Add SD/MMC drive in Allwinner ARM9 BSP;
Add SPI and SPI Flash drivers to Allwinner ARM9 BSP.
Add GD32's gd32303e-eval development board support;
gd32450z-eval supports GNU GCC compilation;
Rewriting the hifive1 board level support package for the risc-v architecture;
About i.MX RT1052, we have completed various development board support: ATK, Fire, seeed studio;
On i.MX RT1052, add the cache-ops functions;
On i.MX RT1052, add I2S driver and WM8960 codec driver support;
Improve ETH driver support (including support for Fire development board) on i.MX RT1052.
Add Hardware Timer driver support on i.MX RT1052.
On i.MX RT1052, add GPIO driver;
On i.MX RT1052, add RTC driver;
On i.MX RT1052, improve SD/MMC driver;
On i.MX RT1052, add SPI driver and SPI Flash driver (connect to SFUD component);
Add USB Device driver on i.MX RT1052.
Add README files and KConfig files in LPC408x BSP;
Add README documents in LPC5460x-LPCXpresso BSP;
Add the display controller driver (Sundm75) in Godson 1C BSP.
Add CAN driver in Loongson 1C BSP(Sundm75);
In GPIO driver of Loongson 1C BSP, add (external) interrupt feature (Zhuangwei);
Use SPI automatic initialization in Loongson 1C BSP.
Add I2C driver in Loongson1C BSP(Sundm75);
Add resistive touch screen driver in Loongson 1C BSP(Sundm75);
In Loongson 1C BSP, the components initiliazation and main function is enable(Zhuangwei).
Add self bootup in Loongson1C BSP (Zhuangwei);
Add README files and KConfig files to Loongson 1C BSP(Zhuangwei).
Fix the rx descriptor issue in init_rx_desc function in NUC472 BSP (Bluebear233);
Add AC97 Audio driver in QEMU-VExpress-A9 BSP;
Add README description file in QEMU-VExpress-A9;
Add I2C driver in stm32f4xx-HAL BSP, and README description file;
Add cache-ops in stm32f7-disco BSP, and README description file;
Add README description file in stm32f10x/stm32f10x-HAL;
Add README specification files and KConfig configuration files in stm32f40x BSP;
Add KConfig configuration file in stm32f20x BSP;
Add README description file to stm32f411-nucleo BSP and enable GNU GCC tool chain support;
Add GPIO driver and README description file in stm32f429-apollo BSP;
Add KConfig configuration files in stm32f429-armfly BSP;
Add README description file in stm32l476-nucleo BSP;
Because V2M-MPS2 does not support in 32-bit machine simulation operation, temporarily remove this BSP.
Add README description file and some firmware file, such as u-boot.bin, wifi firmware etc, in X1000 BSP;

Tools

Add detection feature for the version of GNU GCC tool chain and libc function feature.
Add the function of VSCode editor assistance, and support scons --target=vsc -s under BSP folder to generate configuration files for VSCode.
Add the detection of verson of IAR;
Add the ProjectInfo (Env) function to get information about target: all source files should be compiled, all header files, all macro definitions, the search paths for header file etc.