If you wish to enable the ability for your build of ChromiumOS to perform automatic updates, run the following commands every time you complete a new build using the build steps outlined in this document.
cd ~/Workspace/ChromiumOS
screen cros_sdk --enter
You will be taken into the ChromiumOS chroot to complete the next steps, you will be presented with a line that resembles the line below
(cr) ((d2695f8...)) kmyers@build ~/trunk/src/scripts $
Run the following command (change the port number to match what you specified in the build)
start_devserver --port 8555
Finally press CTRL+Shift+a and the letter “d” on your keyboard to detach from the shell and keep it running in the background.