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AM335X 的uboot 是否支持 USB storage?

Other Parts Discussed in Thread: AM3359

我使用的是AM3359 EVM 公板,根据Linux Core U-Boot User's Guide(processors.wiki.ti.com/.../Linux_Core_U-Boot_User's_Guide 的uboot 是支持 USB storage,但是我用以下操作发现报错。

U-Boot# usb start; fatload usb 0:1 0x80200000 uImage

(Re)start USB...
USB0: lowlevel init failed
USB error: all controllers failed lowlevel init
** Bad device usb 0 **
U-Boot#

我想确认一下AM335X 的uboot 是否支持 USB storage?