Prerequisites
=============
	OS distribution: Suggest RedHat Fedora series 7 above
	Shell: bash
	  NOTE: may not work properly under dash of Ubuntu
	Other host tools: make, gcc, binutils, tar, bzip2, sed, awk, flex, bison, autoconf,
                          gettext, ncurses, libc headers, etc.
          NOTE: this list may not very complete, if you get any error during build because
                of missing command, please refer compling output and install the missed tool.


Installing Toolchain and Source
===============================
To install toolchain, make sure you have root privileges 
If it's our first time to build this SDK, you should build the Toolchain first!
1. unpack the SDK packet 
	$ tar jxf NB_ZCN-1523H_3.0.4_GPL_Source_20110601.tar.bz2
2. cd ~/mainfw
	$ . setenv.sh ZCN-1523H
	$ make toolchain_build

Building NB-ZCN-1523H Firmware
=========================
First of all, make sure u have already built the toolschain
Use the following commands to build firmware
2. cd ~/mainfw
	$ . setenv.sh ZCN-1523H
	$ make

After successfull build you will find the firmware file in the directory:
	~/mainfw/images/NB_ZCN1523.img


Any problem about programming && debugging, please refer the "SDK User Guide".
