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Date: Fri, 10 Nov 2006 23:32:04 +1100 (EST)
From: Ian Smith <smithi@nimnet.asn.au>
To: Vince <jhary@unsane.co.uk>
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Cc: freebsd-stable@freebsd.org
Subject: Re: usb serial lockup
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On Fri, 10 Nov 2006, Vince wrote:

 > 	I have a bit of a wierd problem, My laptop has no serial ports, as is
 > the norm these days, so i have a FTDI based usb serial connector which
 > is very handy and works well. However, what i have found is that freebsd
 > still detects a serial port anyway
 > 
 > sio0: configured irq 4 not in bitmap of probed irqs 0
 > sio0: port may not be enabled
 > sio0 at port 0x3f8-0x3ff irq 4 flags 0x10 on isa0
 > sio0: type 8250 or not responding
 > sio1: configured irq 3 not in bitmap of probed irqs 0
 > sio1: port may not be enabled
 > 
 > and if i'm careless and type tip com1 ( or use minicom on /dev/{ttyd0,
 > cuad0} as root or as a user I hard lock my laptop, nothing responding
 > and i have to powercycle it. this is 100% reproducable.

add to /boot/loader.conf (ditto for sio.1 wouldn't hurt):

hint.sio.0.disabled=1

Ian