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DM8148内核nand启动问题

自己开发的DM8148系统板,通过tftp下载uImage内核,内核能正常启动;通过nfs文件系统,系统能正常启动。但现在问题是,将uImage内核下载到nand中,修改bootcmd = nand read 0x81000000 0x00280000 0x002b0000;bootm 0x81000000,重新上电,第2阶段uboot正常启动,屏幕上显示NAND read:device 0

 offset 0x280000, size 0x2b0000,然后就停在那了。请问这有可能是什么原因引起的?请指教,谢谢!