table of contents
|RC(4)||Device Drivers Manual||RC(4)|
rc — RISCom/8
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.
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
rcdriver 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
rcdriver 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)
rc driver first appeared in
FreeBSD 2.0.5. This manual page first appeared in
This manual page was written by Tom Rhodes <trhodes@FreeBSD.org>.
rc driver code still uses the
spl(9) functions. These should be replaced by
ttyld_*() functions should be
|March 18, 2005||Debian|