编译一个内核后，准备将uImage文件下载到开发板（6410）上去，但是事先准备让开发板和虚拟机ping下，通不过。以下是操作步骤和出现的问题：请大虾们帮忙解决下。。
U-Boot 1.1.6 (Apr 6 2011 - 14:17:30) for FriendlyARM MINI6410
CPU: S3C6410@532MHz
Fclk = 532MHz, Hclk = 133MHz, Pclk = 66MHz, Serial = CLKUART (SYNC Mode
)
Board: MINI6410
DRAM: 256 MB
Flash: 0 kB
NAND: 2048 MB
In: serial
Out: serial
Err: serial
MAC: 08:90:90:90:90:90
Hit any key to stop autoboot: 0
##### FriendlyARM U-Boot(2011-03, NAND) for 6410 #####
[f] Format the nand flash
[v] Download u-boot.bin
[k] Download Linux/Android kernel
[y] Download root yaffs2 image
[a] Download Absolute User Application
[n] Download Nboot.nb0 for WinCE
[w] Download WinCE NK.nb0
[s] Set the boot parameter of Linux
Boot Linux
[q] Quit to shell
NAND(MLC2): 2048 MiB, RAM: 256 MiB
LCD type, firmware version: 1 1046
Enter your Selection:q
Caution: any nand write command may damage your data. DON'T use them
MINI6410 # ping 192.168.58.47
dm9000 i/o: 0x18000300, id: 0x90000a46
DM9000: running in 16 bit mode
MAC: 08:90:90:90:90:90
operating at 100M full duplex mode
checksum bad
checksum bad
checksum bad
checksum bad
ping failed; host 192.168.58.47 is not alive
MINI6410 #
