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	U-Boot tips
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1. add new xcode6 customer board
	a. edit boards.cfg, search for xc6_sdk, 
	   duplicate the line and change the sdk to customer(x);

	b. copy include/configs/xc6_sdk.h to include/configs/xc6_customer(x).h
	   edit the file for customer board specific options;

	c. symbolic link the board/vixs/sdk to board/vixs/customer(x);

	d. make xc6_customer(x) to compile the u-boot

2. u-boot bootargs NFS root
	a. Dynamic IP
	   setenv bootargs root=/dev/nfs nfsroot=$serverip:$nfsrootpath ip=dhcp

	b. Static IP
	   setenv bootargs root=/dev/nfs nfsroot=$serverip:$nfsrootpath \
	   ip=$ipaddr:$serverip:$gatewayip:$netmask:$hostname::off
	
	Note: the eth configure in rootfs should be disabled for NFS Root
