Each distinct ARM architecture requires its own kernel. Because of this the standard Debian distribution only supports installation on a number of the most common systems. The Debian userland however may be used by any ARM CPU including xscale. Most ARM CPUs may be run in either endian mode (big or little). However, the majority of current system implementation uses little-endian mode. Debian currently only supports little-endian ARM systems. The supported systems are: Netwinder This is actually the name for the group of machines based upon the StrongARM 110 CPU and Intel 21285 Northbridge (also known as Footbridge). It comprises of machines like: Netwinder (possibly one of the most common ARM boxes), CATS (also known as the EB110ATX), EBSA 285 and Compaq personal server (cps, aka skiff). NSLU2 The Linksys NSLU2 (Network Storage Link for USB 2.0 Disk Drives) is a small device which allows you to easily provide storage via the network. It comes with an Ethernet connection and two USB ports to which hard drives can be connected. RiscPC This machine is the oldest supported hardware: it was released in 1994. It has RISC OS in ROM, Linux can be booted from that OS using linloader. The RiscPC has a modular CPU card and typically has a 30MHz 610, 40MHz 710 or 233MHz Strongarm 110 CPU fitted. The mainboard has integrated IDE, SVGA video, parallel port, single serial port, PS/2 keyboard and proprietary mouse port. The proprietary module expansion bus allows for up to eight expansion cards to be fitted depending on configuration, several of these modules have Linux drivers.