ASTRO(4) | Device Drivers Manual (hppa) | ASTRO(4)

# 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.

February 17, 2017 | NetBSD 11.0