win7下无法ping通开发板
通过sd卡启动光盘自带的uboot之后，使用uboot菜单中的测试网络，能够测试成功，提示：##### Boot for TQ3358 Main Menu #####
##### EmbedSky TFTP download mode #####
Download u-boot.bin to Nand Flash
Download MLO to Nand Flash
Download Linux Kernel (uImage.bin) to Nand Flash
Download LOGO Picture (logo.bin) to NandFlash
Download UBIFS image (root.bin) to Nand Flash
Download YAFFS image (root.bin) to Nand Flash
Download Program to SDRAM and Run it
Boot the system
Format the Nand Flash
Set the boot parameters
Download User Program
Set TFTP parameters(PC IP,TQ3358 IP,Mask IP...)
Test network (TQ3358 Ping PC's IP)
tftp uboot.bin to SDRAM and Run it
Reboot u-boot
Test kernel Image (uImage)
Return main Menu
Enter your selection: p
TQ3358 ping PC IP:ping 192.168.1.138
link up on port 0, speed 100, full duplex
Using cpsw device
host 192.168.1.138 is alive
看提示是测试成功，但是使用tftp命令下载文件到开发板时总是不成功，再在win7下ping开发板无法连续ping通，要不就是超时，要不就是无法ping通，请问是怎么回事？
开发板通过直通线连交换机，笔记本也是通过直通线连到交换机，照理是不是不应该发生这种事儿呢？ tftp是不太稳定，用SD烧写比较好 我也这样的情况，ping不通
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