Re: Embedded 1394 device difficulties...

On Fri, 2004-01-23 at 09:43, Russel Hill wrote:
> We have a set of 3 embedded 1394 devices using the TSB12LV32/TSB41AB3.
> These devices are implemented using the data mover port and an FPGA.
> They are not IRM capable. In addition to the embedded devices, we have
> two linux boxes running the 2.6.1 kernel, ieee1394 svn version 1105, and
> libraw1394 svn version 139. Two of the embedded devices are spewing
> data, one of the linux boxes consumes this data and spews data to the
> remaining embedded device. In this situation the remaining linux box
> hangs on the 1394 bus but neither generates or consumes 1394 data.
>
> Occasionally, the final embedded device stops receiving data from the
> linux box. All the transmitters appear to be transmitting. This seems
> to occur after a bus reset. Often it recovers with out intervention,
> but sometimes it does not. The syslog messages associated with these
> events are:
>
> ieee1394: Node changed: 0-04:1023 -> 0-02:1023
> ieee1394: Current remote IRM is not 1394a-2000 compliant, resetting...
> ieee1394: The root node is not cycle master capable; selecting a new
> root node and resetting...

Is the above message when it recovers or when it doesn't recover?
You'll probably need to use a FireWire snooper to get to the bottom of
your problem. Without it you can't truely verify if the Linux box has
restarted transmission of the if the receiving embedded device is
listening. Also, if the root node changes after the bus reset, it's
likely that the IRM has changed as well. If you are using isochronous
channels for sending data, then the channels may have changed and your
embedded device is listening on the wrong channel. This is just
speculation of course.

> The "Node changed" message seems most closely tied to the recovery.
>
> Does anyone have any ideas why this would recover sometimes and fail to
> recover other times?
>
> Thanks,
> Russel Hill

-- 
Steve Kinneberg
ACM Systems
(916) 463-7987
kinnebergsteve at acmsystems dot com
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