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School of Computer Science & Engineering
University of New South Wales

 Advanced Operating Systems 
 COMP9242 2006/S2 

Developing your AOS project on Linux

Many CSE students have Linux machines which they would like to be able to use to work away from the CSE labs. The following is a guide as to how to set up the necessary drivers/software. These instructions will be debian specific in some spots (e.g. setting up the tftp server) but they should at least give you an idea of how to set up other distributions.

This page might be of use, however out of date.

The components you will need to install are:

Once installed, the installation can be tested by following the milestone 0 instructions. Some parts of this procedure are un-tested. Please report any problems to

Cross compilers

Crosstool is a system which will automagically build cross-compilers. Prior to crosstool, building cross-compilers was a fairly horrible process.

Follow these steps:

  1. Obtain the latest version of crosstool:
  2. gunzip and tar xvf: tar xvfz crossstool-0.42.tar.gz
  3. Edit the build script: emacs Comment out the 'eval' lines and add: eval `cat armv5b-softfloat.dat gcc-3.4.5-glibc-2.3.5.dat` sh --notest
  4. sudo mkdir crosstool; sudo chown $USER:$USER /opt/crosstool
  5. Run the build script. ./ Go to bed.
  6. When you get up, you should have a toolchain in /opt/crosstool/gcc-3.4.5-glibc-2.3.5/armv5b-softfloat-linux/bin/. Add this directory to your PATH.

Installing drivers

You need device drivers for the RTL8150 based USB to Ethernet dongle, and the FT232RL USB-Serial converter. Fortunately, these drivers are in the linux kernel and are compiled by most modern distributions, so you should be able to plug them in and see messages from the drivers via dmesg.

The modules required are:

If you don't have hotplug set up correctly, you may need to use use modprobe to load the modules. e.g. modprobe rtl8150. You probably want to get this all working automatically, as it is in the CSE labs.

At this stage, we assume a working serial converter and ethernet port. The serial converter is assumed to use device /dev/ttyUSB0 and the ethernet port is assumed to use eth1. Substitute below if your setup varies (e.g. if you are using a real Ethernet port or network).

Setting up the network

The AOS board expects to find a host at You can change this temporarily in the bootloader, but its easiest to set up your host to be at this address. This is not a problem if you are using an independent network provided by the USB to Ethernet dongle.

If your USB to Ethernet dongle is using eth1 (note that it will simply get the next unused ethX interface - i.e. if your wired Ethernet is eth0, wireless is eth1, then the USB-Ethernet converter will be eth2. This should show up in the output of dmesg).

ifconfig eth1 up

Setting up the TFTP server

The bootloader will download your software image from a tftp server running on your host. So you need to set one up:

apt-get install tftpd

Edit your /etc/inetd.conf. Change the following line to reflect the location of the directory which you want to use as your tftp root. (In this case it is /tftpboot).

tftp            dgram   udp     wait    nobody  /usr/sbin/tcpd  /usr/sbin/in.tftpd /tftpboot

You may need to restart inetd at this point using /etc/init.d/inetd restart

You will also need to adjust your handy Makefile if you want it to automatically copy the bootimg.bin file to the tftpboot directory. The variable to look for is: TFTPROOT

Setting up the time server

Uncomment the following line in /etc/inetd.conf :

#time           dgram   udp     wait    root    internal

Set up an NFS share

Install the NFS server:

daves@gedanken:~$ apt-get install nfs-kernel-server nfs-common portmap
Then set up the exports by editing /etc/exports and adding the following lines (adjusted for the location of your tftp root directory and your username):

Install the NSLU2 utility program

It is necessary to be able to control the NSLU2 using a utility program. It controls the reset line, allowing the NSLU2 to boot once a serial console has been opened.

Download the source code. Uncompress it, make, and copy the resulting executable to a directory in your $PATH (or add the nslu2-util directory to your $PATH).

Install other required software

Install the following packages:

apt-get install minicom netcat ethereal

Last modified: 30 Jul 2006.