ADDCOM(4) | Device Drivers Manual | ADDCOM(4) |
addcom
—
multiplexing serial communications interface
addcom0 at isa? port 0x108 irq 5
com* at addcom?
The addcom
driver provides support for
Addonics FlexPort 8/S (and probably FlexPort 4/S) boards that multiplex
together up to eight (or four) EIA RS-232C (CCITT V.28) communications
interfaces.
Each addcom
device is the master device
for up to eight com
devices. The kernel
configuration specifies these com
devices as slave
devices of the addcom
device, as shown in
SYNOPSIS. The slave ID given for each
com
device determines which bit in the interrupt
multiplexing register is tested to find interrupts for that device. The port
specification for the addcom
device is used to
compute the base addresses for the com
subdevices.
The port for the interrupt multiplexing register is fixed, so it is doubtful
that more than one addcom
can be used in a
machine.
OpenBSD support for
addcom
devices first appeared in
OpenBSD 3.0.
May 21, 2008 | OpenBSD-6.4 |