NAME

uturn — U2/Uturn, Runway to GSC Bus I/O Adapter

SYNOPSIS

uturn* at mainbus?
astro* at uturn?
dino* at uturn?
lasi* at uturn?
sti* at uturn?

DESCRIPTION

uturn provides the functionality of an I/O Adapter (IOA) from the Runway CPU and memory bus to two GSC busses. Modern systems, based on the PA-8000 and later 64-bit CPUs, use the U-Turn version, whilst earlier systems, based on the PA-7200 CPU, used a different version of the chip called U2.

SEE ALSO

astro(4), cpu(4), dino(4), gsc(4), intro(4), pci(4), sti(4)

HISTORY

The uturn driver appeared in OpenBSD 3.7. It was ported to NetBSD 6.0 by Nick Hudson.