> What is the BSD user/kernel api that they have to provide this?
BSD uses port-specific driver flags, so changing them requires a
reboot.
>From sio(4):
For standard ISA ports:
device sio
In /boot/device.hints:
hint.sio.0.at="isa"
hint.sio.0.port="0x3f8"
hint.sio.0.flags="0x10"
hint.sio.0.irq="4"
hint.sio.1.at="isa"
hint.sio.1.port="0x2f8"
hint.sio.1.flags="0x0"
hint.sio.1.irq="3"
[...]
Meaning of flags:
0x00001 shared IRQs
0x00002 disable FIFO
[...]
It is important that the setting is port-specific, not global.
Michael
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