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

[Dieter]

>  > > 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.