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Date: Thu, 18 Dec 1997 19:28:48 -0800
From: Tim Gordanier <tim@cyclades.com>
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Subject: "silo overflow" problems with Cyclades boards
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Hello

I work at Cyclades Corporation in the technical support department. 
Cyclades manufactures multiport serial boards.  The kind heart people at
FreeBSD have developed a driver for Cyclades Cyclom-Y family of
multiport for FreeBSD.

Here at Cyclades we have been getting customers having "SILO OVERFLOW"
and/or
"CY OVERFLOW" when using our brand boards for there dialup connections. 
In the past we have been referring people to FreeBSD for help on this
problem sense we did not develop the driver and are not sure were to
find a solution.  I would like to know if there is a solution for the
"SILO OVERFLOW" and/or "CY OVERFLOW" problem, this way we would not have
to sent customers to FreeBSD for help in this case.  (Giving the great
people at FreeBSD more time to do other duties. :-)

It is my understanding that the Cyclades multiport cards uses the cy
driver instead of the usual sio driver for other multiport boards in
FreeBSD.  I also found out from the FreeBSD Handbook (
http://www.freebsd.org/handbook/handbook157.html ) the following:
"If you have a slow CPU or a heavily loaded system and you do not have
16550A-based serial ports, you may receive sio 'silo' errors at 57.6
Kbps."

Sense the Cyclades multiport board use Cirrus Logic CD1400 UART chips
and use the cy driver, could the "SILO OVERFLOW" and/or "CY OVERFLOW"
problem come the different buffering in our boards compared to the
16550A UART?

I believe the cy driver should handle this difference correct?  

Do you know of anything in the driver that may cause or help with the
"SILO OVERFLOW" and/or "CY OVERFLOW"?

Any help would be greatly appreciated.

Regards

Tim
-- 
<><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><>
  Tim Gordanier               WWW: http://www.cyclades.com/
  Cyclades Corporation        Email: mailto:tim@cyclades.com
  Technical Support           Tel: 510.770.9727 x 219    ):Þ
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