rc4

Usage

Overview

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 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 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.