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XBOW(4)		       OpenBSD Programmer's Manual (SGI)	       XBOW(4)

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
     intro(4), mainbus(4)

HISTORY
     The xbow driver first appeared in OpenBSD 4.4.

OpenBSD 4.9			 March 7, 2010			   OpenBSD 4.9

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