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AM5728 烧写uboot从QSPI启动失败



我有一块AM572x evm的板子,可以正常地从SD卡启动。现在我需要将整个系统烧写到QSPI Flash中启动,我将MLO文件和u-boot.img通过TFTP方式烧写到QSPI的对应地址,拔掉sd卡之后启动,出现了下列错误:

U-Boot SPL 2018.01-00228-gb1361bb-dirty (Oct 27 2018 - 13:41:21)
DRA752-GP ES2.0
Trying to boot from SPI
Invalid bus 0 (err=-19)
SPI probe failed.
SPL: failed to boot from all boot devices
### ERROR ### Please RESET the board ###

该怎么解决这个问题呢?谢谢