kern/118093: [firewire] firewire bus reset hogs CPU, causing data to be lost

[Dieter]

The following reply was made to PR kern/118093; it has been noted by GNATS.

From: Dieter <freebsd at sopwith.solgatos.com>
To: Gavin Atkinson <gavin at freebsd.org>
Cc: freebsd-firewire at freebsd.org, bug-followup at freebsd.org
Subject: Re: kern/118093: [firewire] firewire bus reset hogs CPU, causing data to be lost 
Date: Sun, 10 May 2009 11:20:29 +0100

 >  > > This looks like it may be some bad
 >  > > interaction between the firewire stack and using a serial
 >  > > console.  To submitter: It may be worth while switching to
 >  > > uart(4) rather than sio(4) for your serial ports and seeing
 >  > > if that makes any difference (as I don't think uart(4) uses
 >  > > the Giant lock).
 
 >  > Looks to me like commenting out sio doesn't work so well on my box.
 >  > Is that the wrong way to switch from sio to uart?
 >  > Is there something else I need to change instead, or in addition?
 >  
 >  You'll also need to add the uart hints to your device.hints file, if you
 >  haven't already, and update /etc/ttys.
 >  
 >  hint.uart.0.at="isa"
 >  hint.uart.0.port="0x3F8"
 >  hint.uart.0.flags="0x10"
 >  hint.uart.0.irq="4"
 >  
 >  /etc/ttys: you may find you need to change "ttyd0" to "ttyu0".
 >  
 >  Gavin
 
 Thanks, with those changes it works with uart now.
 
 The bad news is that switching from sio to uart didn't fix the
 CPU hogging problem.