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

RISCom/8 multiport card.

Chapter
March 18, 2005
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
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rc(4freebsd) referred by
refer to agetty(8) | mutex(9freebsd) | sio(4freebsd) | spl(9freebsd) | splx(9freebsd) | tty(1) | tty(4) | ttyname(3)