RC(4FREEBSD) - man page online | special files

RC(4)                              BSD Kernel Interfaces Manual                             RC(4)

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 initial‐
     ization 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 chan‐
     nel 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 chan‐
     nel, 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 <@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.

BSD                                       March 18, 2005                                      BSD