NAME
xbow —
Octane and Origin family XIO
bus
SYNOPSIS
xbow0 at mainbus0
DESCRIPTION
The xbow driver provides support for the
XIO bus found on SGI ‘ccNUMA’ designs, such as the Octane
(IP30) and Origin (IP27 and IP35) families, as well as related systems such
as Onyx and Tezro.
XIO components are called ‘widgets’ and contain either I/O devices, processors, or memory.
A XIO bus supports up to 16 widgets, but the existing designs only use up to 8.
Special ‘hub’ widgets allow several XIO buses to be interconnected, expanding the capacity of a given system, and allowing complex multi-node systems to be built.
The widgets currently supported under OpenBSD are:
- impact(4)
- SGI Impact (aka Mardigras) graphics
- odyssey(4)
- SGI VPro (aka Odyssey) graphics
- xbridge(4)
- XIO-PCI bridge
- xheart(4)
- Octane core system widget
SEE ALSO
HISTORY
The xbow driver first appeared in
OpenBSD 4.4.