tiny6410启动

我用SD卡启动，通过 sd-flasher.exe工具，烧录superboot-6410.bin文件后，串口抛出下列信息，然后停止。
  1. 问个问题，从SD启动的Uboot只用superboot-6410.bin吗？那些如u-boot_sd-ram256.bin就不需要吗?
   2.  一般情况下，uboot不需要更改吗？
  谢谢！

U-Boot 1.1.6 (Jul 28 2012 - 23:02:48) for FriendlyARM MINI6410                  
                                                                                
                                                                                
CPU:     S3C6410@532MHz                                                        
         Fclk = 532MHz, Hclk = 133MHz, Pclk = 66MHz, Serial = CLKUART (SYNC Mod
Board:   MINI6410                                                              
DRAM:    256 MB                                                                
Flash:   0 kB                                                                  
NAND:    No NAND device found!!!                                                
0 MB                                                                            
MMC:     0 MB            

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