开发板不能与PC和虚拟机互ping求解

版主，为什么我在TQ2440自带的u-boot下面测试开发板是否与PC和虚拟机可以互ping，但是都不行。我将PC和板子都接在一个没有联网的路由器上面，PC防火墙和虚拟机下面的Linux防火墙都关了，为什么还是ping不通，求解？

#####    Boot for Nor Flash Main Menu   #####
#####     EmbedSky TFTP download mode     #####

[1] Download u-boot.bin to Nand Flash
[2] Download Eboot (eboot.nb0) to Nand Flash
[3] Download Linux Kernel (zImage.bin) to Nand Flash
[4] Download stepldr.nb1 to Nand Flash
[5] Set TFTP parameters(PC IP,TQ2440 IP,Mask IP...)
[6] Download YAFFS image (root.bin) to Nand Flash
[7] Download Program (uCOS-II or TQ2440_Test) to SDRAM and Run it
[8] Boot the system
[9] Format the Nand Flash
[0] Set the boot parameters
[a] Download User Program (eg: uCOS-II or TQ2440_Test)
[b] Download LOGO Picture (.bin) to Nand  Flash
[l] Set LCD Parameters
[o] Download u-boot to Nor Flash
[p] Test network (TQ2440 Ping PC's IP)
[r] Reboot u-boot
[t] Test Linux Image (zImage)
[q] Return main Menu
Enter your selection: 5
Enter the TFTP Server(PC) IP address:(xxx.xxx.xxx.xxx)
192.168.1.2
Enter the SKY2440/TQ2440 IP address:(xxx.xxx.xxx.xxx)
192.168.1.20
Enter the Mask IP address:(xxx.xxx.xxx.xxx)
255.255.255.0
Save TFTP IP parameters?(y/n)
y
Saving Environment to NAND...
Erasing Nand...Writing to Nand... done

#####    Boot for Nor Flash Main Menu   #####
#####     EmbedSky TFTP download mode     #####

[1] Download u-boot.bin to Nand Flash
[2] Download Eboot (eboot.nb0) to Nand Flash
[3] Download Linux Kernel (zImage.bin) to Nand Flash
[4] Download stepldr.nb1 to Nand Flash
[5] Set TFTP parameters(PC IP,TQ2440 IP,Mask IP...)
[6] Download YAFFS image (root.bin) to Nand Flash
[7] Download Program (uCOS-II or TQ2440_Test) to SDRAM and Run it
[8] Boot the system
[9] Format the Nand Flash
[0] Set the boot parameters
[a] Download User Program (eg: uCOS-II or TQ2440_Test)
[b] Download LOGO Picture (.bin) to Nand  Flash
[l] Set LCD Parameters
[o] Download u-boot to Nor Flash
[p] Test network (TQ2440 Ping PC's IP)
[r] Reboot u-boot
[t] Test Linux Image (zImage)
[q] Return main Menu
Enter your selection: p
TQ2440 ping PC IP:ping 192.168.1.2
dm9000 i/o: 0x20000300, id: 0x90000a46
MAC: 10:23:45:67:89:ab
ping failed; host 192.168.1.2 is not alive