RL78/F14 Bootloader with can example

Dear developer, could you  give me an example or some related docs about  bootloader with can?  It  seems like only have example of bootloader with uart  in the website

您好,请问一下瑞萨有Rl78系列基于can的bootloader的例程或者相关的参考资料吗?我在官网上只找到了基于串口的示例程序和文档。