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beagleboard-xm的uboot无法识别网卡,不能通过tftp加载内核和文件系统



请问有编译好能驱动网卡的uboot吗?beagleboard-xm是Rec-B版本。我在uboot里面使用命令tftp c0008000 zImage提示

OMAP3 beagleboard.org # tftp c0008000 zImage
Unknown command 'tftp' - try 'help'