之前参考了这一篇https://blog.csdn.net/GJF712/article/details/125175264 ，将U-Boot默认串口改为了串口2，烧录之后发现U-Boot无法正常运行，下面是log：
U-Boot SPL 2018.01-05679-g013ca45-dirty (Aug 17 2022 - 05:54:10)
DRAM: 32 MiB
Trying to boot from MMC1
Card did not respond to voltage select!
mmc_init: -95, time 22
spl: mmc init failed with error: -95
Trying to boot from sunxi SPI
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