|There's another article about how to perform configuration-related recovery tasks, whereas this article is specifically about the "recovery partition".|
The recovery partition (also referred to as update and recovery firmware) can be accessed using a video or serial console. It is invoked during software update (non-interactively), but can also be used to perform a factory reset or reinstall a corrupted system partition.
Booting into the recovery partition
This isn't necessary unless your system partition is corrupted, and needs to be overwritten.
- Start (or restart, if running) the system
- Press 'f' after a few seconds when the prompt is displayed
Reinstalling the system
Use the install command to overwrite the system partition with a software image file. The most recent version can be downloaded from http://dl2.halon.se/sp/ and should placed on a disk (UFS and FAT are supported) that is attached to this system. If the system is running as a virtual machine, it should be straight forward to attach a new disk. On a physical hardware, a USB stick is probably the most convenient way to attach a disk.