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
hppa/astro(4),
hppa/cpu(4),
hppa/dino(4),
hppa/gsc(4),
hppa/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.