重新启动开发板，在uboot启动读秒阶段，按下任意键，如空格键
U-Boot 2022.10 (Apr 28 2024 - 15:14:00 +0800)
CPU: rv64imafdcvsu
Model: kendryte k230 canmv dongshanpi
DRAM: 510 MiB
Core: 25 devices, 13 uclasses, devicetree: embed
MMC: mmc0@91580000: 0, mmc1@91581000: 1
Loading Environment from MMC... OK
In: serial@91400000
Out: serial@91400000
Err: serial@91400000
Net: No ethernet found.
Hit any key to stop autoboot: 0
此时可进入Uboot命令行，在命令行输入
mmc erase 0x0 0x8000000
等待其执行结束 ，结束后，按下Reset键后，重新进行开发板EMMC烧录