CYC(3) CYC(3)
NAME
cyc - Cyclone fiber interface
SYNOPSIS
bind #C /dev
/dev/cyc
DESCRIPTION
The cyc device drives the Cyclone CVME961 (not 960) card
with an attached SQFBR Squall module to provide a high-speed
point-to-point 9P link between a CPU server and a file
server. Both machines must of course have VME buses. For
debugging, the Cyclone may be loaded with on-board software
using xms (see con(1)) and the NINDY ROM supplied with the
device. In production, though, it is easiest to replace the
ROM with the program in the directory /sys/src/fs/cyc. In
either case, the on-board software expects an identical
Cyclone to be at the other end of the fiber. One of the
boards must be in a CPU server, the other in a file server;
the systems configure their respective boards dynamically as
appropriate.
The driver serves a single file, /dev/cyc. When opened, the
file initializes the connection to the file server. The
resulting file descriptor should be used only to send and
receive 9P messages. Typically boot(8) will open /dev/cyc,
prime the connection by sending nop and session messages
(see attach(5)), and then mount (see bind(2)) the file
descriptor in the CPU server's name space. Thenceforth all
activity on /dev/cyc will be mediated by the mount driver
mnt(3)).
FILES
/sys/src/fs/cyc Directory of on-board software for the
Cyclone.
SEE ALSO
CVME960, CVM961 Single Board Computer User's Manual and
SQFBR User's Manual, Cyclone Microsystems, Inc., New Haven,
CT, 1-203-7865536
SOURCE
/sys/src/9/power/devcyc.c
BUGS
The driver is specific to the SGI Power Series, although the
device should operate on any VME bus.
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