astro4
Astro memory and i/o controller
Usage
astro* at mainbus? elroy* at astro?
Overview
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.