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NAME
       rc — RISCom/8 multiport card


SYNOPSIS
       device isa
       device rc


DESCRIPTION
       The  RISCom/8 is an eight port ISA RS-232C communications multiplexer with a built in RISC processor.  It
       uses a block of sixteen I/O ports in the range 0x200 to 0x3f0 selectable by on-board switches or jumpers.
       The block must be aligned on a sixteen port boundary.  The jumper-selectable hardware interrupt level may
       be set to be detected during system initialization using settings found in the /boot/device.hints file.

       This driver is mostly based on the Cirrus Logic CL-CD180 driver.


HARDWARE
       The rc driver provides support for the SDL Communications RISCom/8 boards.


DIAGNOSTICS
       The following driver specific error messages may be reported:

       rc%d channel%d: interrupt-level buffer overflow  An internal buffer overflow error has  occurred  on  the
       listed channel.  The rc driver will need to be reloaded to correct this.

       rc%d: Bad char chan %d  The channel has obtained a bad set of characters.

       rc%d: Got extra chars chan %d  The rc driver got more characters than expected on the channel shown.

       rc%d:  data  mismatch chan %d ptr %d (%d != %d)  Data sent from channel %d to the rx buffer was different
       then expected.

       rc%d: channel %d command timeout, rc.c line: %d  A command timeout  has  occurred  on  the  channel,  the
       src/sys/dev/rc/rc.c file can be consulted for more information.


SEE ALSO
       tty(1), ttyname(3), sio(4), tty(4), device.hints(5), comcontrol(8), getty(8), mutex(9), splx(9)

       http://www.sdlcomm.com


HISTORY
       The rc driver first appeared in FreeBSD 2.0.5.  This manual page first appeared in FreeBSD 5.3.


AUTHORS
       This manual page was written by Tom Rhodes <trhodes@FreeBSD.org>.


BUGS
       The rc driver code still uses the spl(9) functions.  These should be replaced by mutex(9) functions.

       The various ttyld_*() functions should be documented.

Debian                                           March 18, 2005                                            RC(4)