How to compile Geniatech Netstream 4X Bootloader
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1. Download and install Ubuntu 12.04.5 LTS 32bit desktop
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Get Ubuntu image from http://releases.ubuntu.com/12.04/ and use image ubuntu-12.04.5-desktop-i386.iso
Standard installation, no 3rd party software.  

I used Oracle VirtualBox (Version 5.1.26 r117224 running on Windows7 64bit), 4GB RAM, 32GB HDD, 128MB Gfx,
together with Oracle VM VirtualBox Extension Pack 5.1.14r112924.


2. Upgrade Ubuntu machine
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open Terminal:
	sudo apt-get install nfs-common
	sudo apt-get install xinetd tftpd minicom ccache


3. Copy Geniatech source code
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We need to work with the Ubuntu machine on the provided source code.  Either copy the code to a local drive, or to an external USB storage device, or to an ttached NAS.  

Here is the example for a NAS called "S-M-NAS", where we copied the source code archive to the folder 
/volume1/development/GeniatechOpenSource

On the Ubuntu machine, open Terminal and unpack the archive:
	cd /mnt
	sudo mkdir nas
	sudo chmod 777 nas
	sudo mount -t nfs s-m-nas:/volume1/development nas -nolock

	cd /mnt/nas
	cd GeniatechOpenSource
	tar xzf Netstream4X_uboot.tar.gz


4. Install ARC compiler tool chain
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On the Ubuntu machine, open Terminal:

	cd /mnt/nas
	cd GeniatechOpenSource
	cd Netstream4X_uboot
	sudo tar xzf arc_gcc_rel4.4.tar.gz -C /opt
	cd /opt
	sudo ln -s arc_gcc_rel4.4 arc
	sudo ln -s arc arc-elf
	sudo ln -s arc arc-uclibc
	export PATH=$PATH:/opt/arc/bin


5. Compile uboot image
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	cd /mnt/nas
	cd GeniatechOpenSource
	cd Netstream4X_uboot
	cd vixs/bootloader/uboot_v4.2.12_release_BID3110
	export UBOOTVER=4.2.13
	export PIDCONF=5
	export BIDCONF=0x3110
	cd u-boot-src/u-boot-1.1.3
	sudo make clean
	sudo make corsa_nand_config
	sudo make
	sudo cp u-boot.img ../../uboot.img -f
	cd ../..
	sudo ./generate.sh

The resulting image is then used to preprogram the Boot ROM chips before assembly.