关于R5F10PGG出现E0562320:Section address overflowed out of range : ".const"问题

This FAQ may help you:
FAQ - E0562320 Error Message (RL78 CC-RL)
https://en-support.renesas.com/knowledgeBase/16978833

上方连接的方法试过后，没有解决问题

.const should be located within mirror area.
Too big .text may cause this problem if exceed 0xb000. I suppose you should move .const in lower address than .text, or just move start address of data sections with far ROM option.

还有一个问题想请教一下，程序相同并且没有错误但是起始地址不同的两个BOOT程序，同时烧录到FLASH，为什么从0x0000跳转到0x8000的BOOT程序后不能运行呢？

Then you should use -far_rom option or add __far for all const variables.
Once try downgrading E0562320 to warning with -CHange_message option to see how the sections are overwrapped in map file.

Then you should use -far_rom option or add __far for all const variables.
Once try downgrading E0562320 to warning with -CHange_message option to see how the sections are overwrapped in map file.