U-Boot阶段手动加载设备树遇到end kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(0,0)

手动加载步骤参考 https://www.rocketboards.org/foswiki/Documentation/HOWTOCreateADevicetreeForAgilexSoC  手动加载设备树。

自动加载的U-Boot脚本参考：https://github.com/johnnyfan1979/public_doc/blob/main/documentation/DE25_Nano/DE25%20Nano%20Build%20Linux%20image%20from%20scratch.md 

提示如下：end kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(0,0)

 

 原来是setenv bootargs "console=ttyS0,115200 root=${mmcroot} rw rootwait" 命令，键盘 双引号打不出来，所以开始用单引号代替的，   但是后来发现@键可以打出双引号。