GSC(4) - Device Drivers Manual (hppa) #
GSC(4) - Device Drivers Manual (hppa)
NAME #
gsc - introduction to HP 9000/700 GSC bus support
SYNOPSIS #
gsc* at lasi? gsc* at asp? gsc* at wax?
DESCRIPTION #
The General System Connect (GSC) bus is the core I/O bus for all HP 9000/700 workstations. All I/O subsystems connect to this bus. The devices can be either on separate chips, expansion cards or on an integrated megacell, like the LASI MBA.
The
GSC
bus is a 32-bit wide, address and data multiplexed bus.
In its “standard” implementation it has a maximum throughput of 160MB/s,
the “2x” implementation reaches up to 250MB/s.
Some HPPA CPUs directly attach to this bus, namely the PA7100LC and PA7300LC.
As for the expansion cards, there are different form-factors, depending on bus-speed (standard or 2x) and specific models. The standard formfactor is the “EISA form-factor”; cards that look like typical EISA cards with a different connector (100-pin female EBBL). The Series 712 have their own special type of GSC expansion cards, called the “GIO form-factor”, which is quite small and mostly has only one VLSI chip on it (in most cases LASI/WAX). Newer systems sometimes feature the “HSC formfactor”, which is a 1U-VME card-like expansion card with a 100-pin male pin+socket connector. Mixing cards with different speeds is supported but downgrades the performance of the whole I/O-subsystem.
OpenBSD provides support for the following devices:
arcofi(4)
Siemens PSB2160 audio codec
com(4)
serial communications interface
gsckbc(4)
PC-style keyboard controller
harmony(4)
CS4215/AD1849 audio
hil(4)
introduction to HP-HIL support
ie(4)
Intel i82596 Ethernet device
lpt(4)
parallel port driver
oosiop(4)
Symbios/NCR53C700 SCSI I/O Processor
osiop(4)
Symbios/NCR53C710 SCSI I/O Processor
Some of these
GSC
devices also have
PCI,
EISA,
or
ISA
equivalents.
These are listed in
pci(4),
eisa(4),
or
isa(4).
SEE ALSO #
asp(4), cpu(4), intro(4), lasi(4), wax(4)
HISTORY #
The gsc driver appeared in OpenBSD 2.6.
OpenBSD 7.5 - December 21, 2011