Re: flexfax: Message clarification

[David Woolley <david@djwhome.demon.co.uk>]

> i tried changing all parameters including handshake, but nothing
> changed. my last try was to put the speed up to 57600 and now 
> all received faxes are fine. no bad lines anymore....

If you are getting paradoxical speed dependence like this and
you are prepared to take the risk of running with a patched kernel
and are using the 2.0.36 linux kernel, I am currently testing a version
of serial.c which handles interrupts in the way described in the
National Semiconductor design notes, rather than the way used in
the current code.  I believe the current code causes corruption when
transmit interrupts are enabled and disabled.

If you or anyone is interested in testing alpha level driver code
in this area, please let me know.  At the time of writing, I only
support hardware flow control fully and it has only been tested on
PPP, but I might complete software flow control support soon.  I also
haven't fully implemented shared interrupts (dumb multi-port cards).