go to
> tty(1)
> ttyname(3)
> sio(4)
> tty(4)
> mutex(9)
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man page of rc

rc: RISCom/8 multiport card


rc - RISCom/8 multiport card


device isa device rc


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.


The rc driver provides support for the SDL Communications RISCom/8 boards.
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.
tty(1), ttyname(3), sio(4), tty(4), device.hints(5), comcontrol(8), getty(8), mutex(9), splx(9) //www.sdlcomm.com


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


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


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. RC(4)

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