Types of images you can create

The IDE lets you create the following images:

OS image (.ifs file)
An image filesystem. A bootable image filesystem holds the procnto module, your boot script, and possibly other components such as drivers and shared objects.
Flash image (.efs file)
A flash filesystem. (The e stands for embedded.) You can use your flash memory like a hard disk to store programs and data.
Combined image
An image created by joining together any combination of components (IPL, OS image, embedded filesystem image) into a single image. You might want to combine an IPL with an OS image, for example, and then download that single image to the board's memory via a ROM monitor, which you could use to burn the image into flash. A combined image's filename extension indicates the file's format (e.g. .elf, .srec, etc.).

If you plan on debugging applications on the target, you must include pdebug in /usr/bin. If the target has no other forms of storage, include it in the OS image or flash image.