* Update thread-comm.md

* Update documentation/thread-comm/thread-comm.md
Co-authored-by: Man, Jianting (Meco) <920369182@qq.com>

* [dfs] sync cromfs

* [rt-smart]Weaken RT_USING_LWP, use RT_USING_SMART as macro configuration

* [format] fix some format issue.

* [bsp][core-v-mcu]兼容原有FreeRTOS函数接口，兼容CLI

* [STM32][SPI]使用rt_hw_cpu_dcache_ops函数替换HAL库函数

* 规范代码格式

* [STM32][SPI]在H7芯片下修复时钟频率获取错误问题并添加DMA驱动
* H7下SPI时钟不再为外设总线时钟频率
* H7下DMA驱动需要进行CacheLine对齐

* [bsp][lpc55sxx] add support for LPC55S16

* [bsp][lpc55s16] formating LPC55S16 driver

* [sensor][cmd] add sensor_get_type/vender/unit_name functions

* rename sensor folder

* [rtdef] rename RT_WEAK attribute as rt_weak

* [rtdef] rename RT_USED attribute as rt_used

* [rtdef] rename RT_SECTION attribute as rt_section

* [rtdef] rename ALIGN attribute as rt_align

* [legacy] add RT_USED ALIGN RT_SECTION RT_WEAK as legacy support

https://github.com/armink/SFUD/commit/db9a1746df24142bd762378bc4e0dcf65b668b2d

Co-authored-by: 1516081466@qq.com <ws051000>

* [risc-v/libcpu] porting Smart & RTOS
* [fix] rv64 plic
* [risc-v/rv64] remove macro in rtdef

* fix usage of rt_event for drv_spi.c in renesas's libraries.

* add core-v-mcu bsp

* 规范bsp格式 添加readme

* 修改readme

Co-authored-by: 1516081466@qq.com <ws051000>

* add ra4m2 soc support, add sci spi support for ra4m2

* update ra4m2-eco/README.md

* update ra4m2-eco/README.md

* rename board picture name.

* reduce picture size, update README.md, remove file 'Target 1.bat'

* reduce picture size

* [tools][musl] add scons --exec-prefix= 用于设置编译工具的前缀

可以通过如下命令在qemu直接调用musl工具链：
scons --exec-path=C:\xxx\arm-linux-musleabi_for_i686-w64-mingw32\bin --exec-prefix=arm-linux-musleabi-

* comment out GenCconfigFile

* 解决部分env变量提前预载之后重载变量的问题

* 1.407/437 uart2 pins change to pd5/pd6. 2.uart and spi drivers support dma

* [bsp/at32] remove #ifndef

* [STM32][SPI]优化APBx时钟配置代码