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am335 u boot 启动方式 SYSBOOT 管脚配置



通过文档看到 可以有很多种启动方式

想让am335 evm 开发板通过usb0启动 然后sysboot管脚配置如下

SYSBOOT [0 4] 

11010

通过串口观察到出现错误:

U-Boot SPL 2011.09 (Apr 08 2012 - 18:29:14)
Texas Instruments Revision detection unimplemented
spl: ERROR: This bootmode is not implemented - hanging### ERROR ### Please RESET the board ###

请问这个怎么解决,是不可以用USB启动 还是管脚配置错误?