Rom Monitor
A monitor generally provides a simple command prompt, with options for reading/writing memory and perhaps some power-on testing facilities which are useful before the kernel boots.
ROM monitors invariably include boot loader functionality, but if your device goes into production you may want a standalone boot loader or a stripped-down ROM monitor.
Reference
http://penguinppc.org/embedded/howto/rom-monitor.html — Various ROM monitors
page revision: 0, last edited: 25 Jun 2010 18:26