12-11-2011
Another possibility is the device not asserting a hardware control line when the serial port is set for CTS/RTS hardware handshaking, which could prevent the port from opening, I think.
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SPIF(4) BSD Kernel Interfaces Manual SPIF(4)
NAME
spif -- SBus (spiffy) Serial/Parallel Interface
SYNOPSIS
spif* at sbus? slot ? offset ? (sun4c/sun4m/sun4u)
stty* at spif? (sun4c/sun4m/sun4u)
sbpp* at spif? (sun4c/sun4m/sun4u)
DESCRIPTION
The spif driver provides support for the Sun Serial/Parallel Interface card (Sun part number 501-1931), which is based on the Cirrus Logic
CD180 octal serial controller and the Cirrus Logic PPC2 parallel port controller.
The device minor numbers for this driver are encoded as follows:
+---+---+---+---+---+---+---+---+
| 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
+---+---+---+---+---+---+---+---+
| | | | | | | |
| | | | | +---+---+---> port number
| | | | |
| | | | +---------------> unused
| | | |
| | | +-------------------> dial-out (on tty ports)
| | |
| | +-----------------------> unused
| |
+---+---------------------------> card number
Up to four cards are supported in the system.
Each of the serial ports has an 8 byte FIFO for receive and transmit as well as automatic hardware (RTS/CTS) flow control.
FILES
/dev/ttyS[0123][0-7] Serial ports
/dev/bppS[0-3] Parallel ports
DIAGNOSTICS
spif%d: ccr timeout A timeout occurred while writing to one of the CD180 registers.
stty%d-%d: ring overflow Incoming characters were discarded because the application in control of the device did not read the input fast
enough.
SEE ALSO
intro(4), sbus(4), tty(4)
HISTORY
The spif adapter was first supported in OpenBSD 2.5. The driver was ported to NetBSD 3.0.
AUTHORS
The driver was written by Jason Wright <jason@thought.net>, and is heavily based on the magma(4) driver written by Iain Hibbert.
TODO
The parallel port is not supported yet.
Dial-out (cua) devices are not yet supported.
BSD
February 4, 1999 BSD