NAME
astro —
Astro Memory and I/O
controller
SYNOPSIS
astro* at mainbus?
elroy* at astro?
DESCRIPTION
The
astro driver provides support for the Astro memory and I/O
controller used on systems with PA-8500 and later 64-bit CPUs. It functions as
a bridge from the Runway bus to up to 8 I/O ropes that connect to Elroy chips.
Astro contains an IOMMU and provides support for cache coherent DMA.
SEE ALSO
hppa/cpu(4),
hppa/elroy(4),
hppa/intro(4)
HISTORY
The
astro driver first appeared in
OpenBSD
4.2. It was ported to
NetBSD 6.0 by Nick
Hudson.