Disable FIFO on UART

Lowell Gilbert freebsd-questions-local at be-well.ilk.org
Mon May 6 15:21:19 UTC 2013

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.

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