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Date: Thu, 29 Jan 2009 15:33:36 -0500
To: Timo Rikkonen <Timo.Rikkonen@syncrontech.com>,
	"freebsd-stable@freebsd.org" <freebsd-stable@freebsd.org>
From: Mike Tancsa <mike@sentex.net>
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Subject: Re: /dev/cuau* ports hang after a while
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At 08:00 AM 1/26/2009, Timo Rikkonen wrote:
>Hi,
>
>We are using "VScom PCI-200L" and "Moxa Technologies, C168H/PCI" 
>-cards for serial ports. After installing 7.0 the ports or the 
>connection to the port hang after a while. A "while" could be 
>half-a-day or 10 minutes.
>There is no error message to be seen anywhere.
>
>Not all ports hang at the same time, it could be just one or two of 
>them. Earlier versions (6.2-RELEASE) work just fine.
>The ports have different devicenames after 7.0, in 6.2 they were 
>/dev/cuad4-7, now they are /dev/cuau0-3 (uart?)


Is the application fairly low speed (e.g. 9600bps or slower) ?  If 
so, try with 7.1R, not 7 and add

hint.uart.0.flags="0x100"
hint.uart.1.flags="0x100"

to /boot/device.hints

http://www.freebsd.org/cgi/query-pr.cgi?pr=121421

has details

         ---Mike