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Date:      Sun, 10 May 2009 11:20:29 +0100
From:      Dieter <freebsd@sopwith.solgatos.com>
To:        Gavin Atkinson <gavin@freebsd.org>
Cc:        freebsd-firewire@freebsd.org, bug-followup@freebsd.org
Subject:   Re: kern/118093: [firewire] firewire bus reset hogs CPU, causing data to be lost 
Message-ID:  <200905101820.SAA05694@sopwith.solgatos.com>
In-Reply-To: Your message of "Fri, 06 Mar 2009 16:00:08 GMT." <200903061600.n26G082b030204@freefall.freebsd.org> 

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>  > > 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.



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