* fix usage of rt_event for drv_spi.c in renesas's libraries.
* 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
- 添加 RA 系列 BSP 开发教程 - 添加 ra6m4-iot PPP 上网 - 整理 驱动文件