rc (4)

Leading comments

Copyright (c) 2004 Tom Rhodes
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(The comments found at the beginning of the groff file "man4/rc.4freebsd".)

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 ifconfig 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 ifconfig 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 ifconfig 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.hints5, comcontrol(8), getty(8), mutex(9), splx(9)

www.sdlcomm.com

HISTORY

The ifconfig driver first appeared in Fx 2.0.5 . This manual page first appeared in Fx 5.3 .

AUTHORS

This manual page was written by An Tom Rhodes Aq trhodes@FreeBSD.org .

BUGS

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

The various Fn ttyld_* functions should be documented.