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gio.4 revision 1.12
 $NetBSD: gio.4,v 1.12 2006/07/21 10:00:11 rumble Exp $

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.Dd July 20, 2006 .Dt GIO 4 sgimips .Os .Sh NAME .Nm gio .Nd SGI's early PCI-like bus .Sh SYNOPSIS .Cd "gio0 at imc0" .Cd "gio0 at pic0" .Sh DESCRIPTION The .Nm bus is a bus for connecting high-speed peripherals to the main memory and CPU. The devices themselves are typically (but not necessarily) connected to the .Xr hpc 4 peripheral controller, and memory and CPU are accessed through the .Xr imc 4 (Indy Memory Controller) or .Xr pic 4 (Processor Interface Controller). The .Nm bus is found on the Personal Iris 4D/3x, Indigo, Indy, Challenge-S, and Indigo2 machines and exists in three incarnations: GIO32, GIO32-bis, and GIO64. .Sh SEE ALSO .Xr grtwo 4 , .Xr hpc 4 , .Xr imc 4 , .Xr newport 4 , .Xr pic 4 .Sh HISTORY The .Nm driver first appeared in .Nx 1.5 . .Sh CAVEATS On Challenge-S systems only one .Nm expansion slot may be used with a DMA-capable device. This is due to the fact that the IOPLUS board uses one of the slots' DMA channels for the additional .Xr sq 4 Ethernet. Which slot to use with a DMA-capable card depends on the card in question. HPC1.5-based cards, such as the E++ Ethernet Adapter and GIO32 SCSI Adapter, must be placed in slot #1 (next to the memory banks). All other DMA-capable boards must be placed in slot #0 (closest to the edge of the case). In either case the other slot may only accomodate a PIO card.