Hi 海波 林
please try uboot-imx
uboot-imx.git - Freescale i.MX u-boot Tree
and check /* USB Configs */
#define CONFIG_CMD_USB
in uboot/include/configs/mx6sabresd.h
uboot-imx.git - Freescale i.MX u-boot Tree
look at usb uboot commands in
http://cache.freescale.com/files/32bit/doc/quick_ref_guide/MEDIA5200UBPG/MEDIA5200UBPG.pdf
Best regards
igor
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