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IPNC boot with sd card, error occured

I am working on DM8127 with IPNC_RDK_3.00.00.   I try to boot from sd card.  I set boot args like this:

setenv bootargs 'console=ttyO0,115200n8 noinitrd mem=80M rootwait vram=4M notifyk.vpssm3_sva=0xBFD00000 root=/dev/mmcblk0p2 rw eth=00:18:32:38:df:47 ip=192.168.1.168 cmemk.phys_start=0x85000000 cmemk.phys_end=0x89000000 cmemk.allowOverlap=1 earlyprintk';saveenv

Kernel can boot sucessfully, but when it comes to boot_proc, I got this message:

................

killall: dhcpcd: no process killed
rm: cannot remove '/var/run/dhcpcd-eth0.pid': No such file or directory
net_search_gateway:eth0, 1A8C0, 0, 1
dns=192.168.1.1
net_search_gateway:eth0, 1A8C0, 0, 1
net_search_gateway:eth0, 0, FE01A8C0, 3
dns=192.168.1.1
TimeOut occure in boot_proc.
Program exit.
TimeOut occure in boot_proc.
Program exit.

 [host] MCFW_IPCBITS: Callback function:App_ipcBitsInCbFxn;

...................

The network is down. Can anyone tell me what is the matter?