Disable FIFO on UART

[Lowell Gilbert]

Miguel Barbosa Gonçalves <m at mbg.pt> writes:

> Back in FreeBSD 7 there was a flag to disable the FIFO on the sio
[...]
> Now with FreeBSD 8 which uses the UART device driver there's no option for that.
>
> I am looking to reduce the jitter I am getting on the serial port when
> connecting a GPS to the server.
>
> Can anyone help?

It looks do-able, although the interface is a bit more abstract and
covers a wider variety of hardware. You would probably need to contact
whoever's working on that driver these days.