Milestone 0: Familiarisation
This is a simple exercise designed to get you started on L4. It
contains very detailed instructions, together with the existing
source code and the L4 manual you should have no problem doing
- Get yourself a copy of the skeleton
- Build and run the example.
tar zxvf sos.tar.gz
- This should create
- The example skeleton operating system includes an
tty_test which starts up, prints out
its thread id, and then goes into a loop.
- The example includes a
that outputs data to L4's debug console. In fact it uses the
function. This function should only be used for internal SOS
debugging, not as a console for applications, so, your task is
to modify the
printf function to send data to the
other serial port.
The second part of milestone zero is to find a partner for the
rest of the project. The project is to be completed unless prior
permission has been obtained from the LiC.
- Read (and understand) the code in
and the code in the
- Read the documentation on libserial.
- Design an IPC protocol to transfer data from the user
program to your operating system.
- Write a client side implementation called
tty_send_string (or similar) in
- Change the
to handle recognise your new protocol, and print out a debug
message when you receive one of these messages.
tty_test.c so that it tests your
- Change the server side so that it now prints the data to the
- Change the implementation of
printf to use your
- Test that all of
tty_test's output now goes to
the second serial line, not the console debugger.
You will need to demonstrate your solution, running on the U4600
hardware to the tutor during the demonstration period. You
should be prepared to show your tutor which files you modified
in your solution, and explain any design decisions you made.
You will let the tutor know who your partner is so that group
accounts can be created for you.
29 Aug 2003.